diff --git a/Datasheets/MQ-135.pdf b/Datasheets/MQ-135.pdf deleted file mode 100644 index 37aadac..0000000 --- a/Datasheets/MQ-135.pdf +++ /dev/null @@ -1,155 +0,0 @@ -TECHNICAL DATA MQ-135 GAS SENSOR - -FEATURES - - Wide detecting scope Fast response and High sensitivity - - Stable and long life Simple drive circuit - -APPLICATION - - They are used in air quality control equipments for buildings/offices, are suitable for detecting - -of NH3,NOx, alcohol, Benzene, smoke,CO2 ,etc. - -SPECIFICATIONS - - A. Standard work condition - -Symbol Parameter name Technical condition Remarks - -Vc Circuit voltage 5V±0.1 AC OR DC - -VH Heating voltage 5V±0.1 ACOR DC - Room Tem -RL Load resistance can adjust - 33Ω±5% -RH Heater resistance less than 800mw - -PH Heating consumption - -B. Environment condition - -Symbol Parameter name Technical condition Remarks - -Tao Using Tem -10 -45 - -Tas Storage Tem -20 -70 - -RH Related humidity less than 95%Rh - -O2 Oxygen concentration 21%(standard condition)Oxygen minimum value is - - concentration can affect sensitivity over 2% - -C. Sensitivity characteristic - -Symbol Parameter name Technical parameter Ramark 2 -Rs Sensing 30KΩ-200KΩ Detecting concentration - - Resistance (100ppm NH3 ) scope - 10ppm-300ppm NH3 - α Concentration ≤0.65 10ppm-1000ppm -(200/50) Slope rate - NH3 Benzene -Standard Temp: 20 ±2 Vc:5V±0.1 -Detecting Humidity: 65%±5% Vh: 5V±0.1 10ppm-300ppm - Alcohol - -Condition - -Preheat time Over 24 hour - -D. Structure and configuration, basic measuring circuit - - Parts Materials Fig.2 -1 Gas sensing SnO2 - - layer Au -2 Electrode Pt -3 Electrode line Ni-Cr alloy -4 Heater coil Al2O3 -5 Tubular ceramic Stainless steel gauze -6 Anti-explosion (SUS316 100-mesh) - Copper plating Ni - network Bakelite -7 Clamp ring Copper plating Ni -8 Resin base -9 Tube Pin - -Configuration A Fig. 1 - - Configuration B - - AÏ ò AÏ ò - - Structure and configuration of MQ-135 gas sensor is shown as Fig. 1 (Configuration A or B), sensor composed by -micro AL2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a -crust made by plastic and stainless steel net. The heater provides necessary work conditions for work of sensitive - components. The enveloped MQ-135 have 6 pin ,4 of them are used to fetch signals, and other 2 are used for -providing heating current. - - Electric parameter measurement circuit is shown as Fig.2 - - E. Sensitivity characteristic curve - - Fig.2 sensitivity characteristics of the MQ-135 - -10 MQ-135 Fig.3 is shows the typical - sensitivity characteristics of - - the MQ-135 for several gases. - - AI R in their: Temp: 20 - - CO2 Humidity: 65% - - O2 concentration 21% - RL=20kΩ - CO - - ¾ ¾Æ« Ro: sensor resistance at 100ppm of - -Rs/Ro NH4 NH3 in the clean air. - ¼ ±× ½ Rs:sensor resistance at various - ± Íû ª - concentrations of gases. - - 1 - - ppm - -0. 1 100 1000 - 10 - - 1. 8 - - 1. 6 33%RH Fig.4 is shows the typical dependence of - 1. 4 the MQ-135 on temperature and humidity. - 85%RH Ro: sensor resistance at 100ppm of NH3 in air - Rs/Ro 1. 2 - - 1 at 33%RH and 20 degree. - - 0. 8 Rs: sensor resistance at 100ppm of NH3 - - 0. 6 at different temperatures and humidities. - - 0. 4 Fig.4 - - 0. 2 degr ee - - 0 - - - 20 - 10 0 10 20 30 40 50 60 - -SENSITVITY ADJUSTMENT - Resistance value of MQ-135 is difference to various kinds and various concentration gases. So,When using - -this components, sensitivity adjustment is very necessary. we recommend that you calibrate the detector for -100ppm NH3 or 50ppm Alcohol concentration in air and use value of Load resistancethat( RL) about 20 KΩ(10KΩ -to 47 KΩ). - - When accurately measuring, the proper alarm point for the gas detector should be determined after -considering the temperature and humidity influence. - diff --git a/Datasheets/MQ131 - sensorsportal.pdf b/Datasheets/MQ131 - sensorsportal.pdf new file mode 100644 index 0000000..c6412a5 --- /dev/null +++ b/Datasheets/MQ131 - sensorsportal.pdf @@ -0,0 +1,165 @@ + MQ131 Semiconductor Sensor for Ozone + + Sensitive material of MQ131 gas sensor is SnO2, which with lower conductivity in clean air. When +Ozone gas exists. The sensor’s conductivity is more higher along with the gas concentration rising. +Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas +concentration. + + MQ131 gas sensor has high sensitity to Ozone, also sensitive to CL2, NO2, etc. + +Character Configuration + +* Good sensitivity to Ozone in wide range +* High sensitivity to Ozone +* Long life and low cost +* Simple drive circuit + +Application + +* Domestic Ozone concentration overload Detector +* Industrial Ozone concentration overload Detector +* Portable Ozone concentration overload Detector + +Technical Data Basic test loop + + Model No. MQ131 Vc VRL + + Sensor Type Semiconductor + +Standard Encapsulation Bakelite (Black Bakelite) + + Detection Gas Ozone RL + VH + Concentration 10-1000ppm Ozone + GND + Loop Voltage Vc ≤24V DC + The above is basic test circuit of the sensor. +Circuit Heater Voltage VH 5.0V±0.2V AC or DC The sensor need to be put 2 voltage, + Load Adjustable heater voltage（VH）and test voltage（VC）. + RL VH used to supply certified working + temperature to the sensor, while VC used + Resistance to detect voltage (VRL) on load resistance + （RL）whom is in series with sensor. The + Heater 31Ω±3Ω（Room Tem.） sensor has light polarity, Vc need DC + RH power. VC and VH could use same power + circuit with precondition to assure + Resistance performance of sensor. In order to make + the sensor with better performance, + Heater ≤900mW suitable RL value is needed: + PH 50KΩ-500KΩ(in 50ppm O3) + + consumption +Character + + Sensing + Rs + + Resistance + + Sensitivity S Rs(in air)/Rs(in 50ppm O3)≥3 + (R /R 50ppm 10ppm O3) + Slope α + 20℃±2℃；65%±5%RH + Tem. Humidity + +Condition Standard test circuit Vc:5.0V±0.1V； + VH: 5.0V±0.1V + + Preheat time Over 48 hours + +Power of Sensitivity body(Ps): Ps=Vc2×Rs/(Rs+RL)2 + +Resistance of sensor(Rs): Rs=(Vc/VRL-1)×RL + Sensitivity Characteristics Influence of Temperature/Humidity + +Fig.1 shows the typical sensitivity characteristics of Fig.2 shows the typical temperature and humidity +the MQ131, ordinate means resistance ratio of the sensor characteristics. Ordinate means resistance ratio + +(Rs/Ro), abscissa is concentration of gases. Rs means of the sensor (Rs/Ro), Rs means resistance of sensor + in 50ppm Ozone under different tem. and humidity. +resistance in different gases, Ro means resistance of Ro means resistance of the sensor in environment of +sensor in 50ppm CL2. All test are under standard 50ppm Ozone, 20℃/65%RH +test conditions. + +Structure and configuration + +Structure and configuration of MQ131 gas sensor is shown as Fig. 3, sensor composed by micro AL2O3 ceramic tube, Tin +Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a crust made by plastic and stainless steel +net. The heater provides necessary work conditions for work of sensitive components. The enveloped MQ-4 have 6 pin, 4 +of them are used to fetch signals, and other 2 are used for providing heating current. + Notification + +1 Following conditions must be prohibited +1.1 Exposed to organic silicon steam + + Organic silicon steam cause sensors invalid, sensors must be avoid exposing to silicon bond, +fixature, silicon latex, putty or plastic contain silicon environment + +1.2 High Corrosive gas + + If the sensors exposed to high concentration corrosive gas (such as H2Sz, SOX, Cl2, HCl etc), it will +not only result in corrosion of sensors structure, also it cause sincere sensitivity attenuation. + +1.3 Alkali, Alkali metals salt, halogen pollution + + The sensors performance will be changed badly if sensors be sprayed polluted by alkali metals salt +especially brine, or be exposed to halogen such as fluorin. + +1.4 Touch water + Sensitivity of the sensors will be reduced when spattered or dipped in water. + +1.5 Freezing + Do avoid icing on sensor’surface, otherwise sensor would lose sensitivity. + +1.6 Applied voltage higher + + Applied voltage on sensor should not be higher than stipulated value, otherwise it cause down-line or +heater damaged, and bring on sensors’ sensitivity characteristic changed badly. + +1.7 Voltage on wrong pins + For 6 pins sensor, if apply voltage on 1、3 pins or 4、6 pins, it + +will make lead broken, and without signal when apply on 2、4 pins + +2 Following conditions must be avoided +2.1 Water Condensation + + Indoor conditions, slight water condensation will effect sensors performance lightly. However, if water +condensation on sensors surface and keep a certain period, sensor’ sensitivity will be decreased. + +2.2 Used in high gas concentration + No matter the sensor is electrified or not, if long time placed in high gas concentration, if will affect + +sensors characteristic. + +2.3 Long time storage + The sensors resistance produce reversible drift if it’s stored for long time without electrify, this drift is + +related with storage conditions. Sensors should be stored in airproof without silicon gel bag with clean air. +For the sensors with long time storage but no electrify, they need long aging time for stbility before using. + +2.4 Long time exposed to adverse environment + No matter the sensors electrified or not, if exposed to adverse environment for long time, such as + +high humidity, high temperature, or high pollution etc, it will effect the sensors performance badly. + +2.5 Vibration + Continual vibration will result in sensors down-lead response then repture. In transportation or + +assembling line, pneumatic screwdriver/ultrasonic welding machine can lead this vibration. + +2.6 Concussion + If sensors meet strong concussion, it may lead its lead wire disconnected. + +2.7 Usage + For sensor, handmade welding is optimal way. If use wave crest welding should meet the following + +conditions: + 2.7.1 Soldering flux: Rosin soldering flux contains least chlorine + 2.7.2 Speed: 1-2 Meter/ Minute + 2.7.3 Warm-up temperature：100±20℃ + 2.7.4 Welding temperature：250±10℃ + 2.7.5 1 time pass wave crest welding machine + +If disobey the above using terms, sensors sensitivity will be reduced. + diff --git a/Datasheets/MQ135 - Hanwei.pdf b/Datasheets/MQ135 - Hanwei.pdf new file mode 100644 index 0000000..d30345a --- /dev/null +++ b/Datasheets/MQ135 - Hanwei.pdf @@ -0,0 +1,233 @@ +HANWEI ELECTRONICS CO.,LTD MQ-135 http://www.hwsensor.com + +TECHNICAL DATA MQ-135 GAS SENSOR + +FEATURES + + Wide detecting scope Fast response and High sensitivity + + Stable and long life Simple drive circuit + +APPLICATION + + They are used in air quality control equipments for buildings/offices, are suitable for detecting + +of NH3,NOx, alcohol, Benzene, smoke,CO2 ,etc. + +SPECIFICATIONS + + A. Standard work condition + +Symbol Parameter name Technical condition Remarks + Vc Circuit voltage 5V±0.1 AC OR DC + VH Heating voltage 5V±0.1 ACOR DC + RL Load resistance + RH Heater resistance can adjust Room Tem + 33Ω±5% + +PH Heating consumption less than 800mw + + B. Environment condition + +Symbol Parameter name Technical condition Remarks + Tao Using Tem -10℃-45℃ + +Tas Storage Tem -20℃-70℃ + +RH Related humidity less than 95%Rh + +O2 Oxygen concentration 21%(standard condition)Oxygen minimum value is + + concentration can affect sensitivity over 2% + + C. Sensitivity characteristic + +Symbol Parameter name Technical parameter Ramark 2 +Rs Sensing 30KΩ-200KΩ + Resistance Detecting concentration + α (100ppm NH3 ) scope： + (200/50) + Concentration ≤0.65 10ppm-300ppm NH3 + NH3 Slope rate 10ppm-1000ppm +Standard +Detecting Temp: 20℃±2℃ Vc:5V±0.1 Benzene +Condition Humidity: 65%±5% Vh: 5V±0.1 + 10ppm-300ppm + Alcohol + +Preheat time Over 24 hour + + D. Structure and configuration, basic measuring circuit + + Parts Materials Fig.2 +1 Gas sensing SnO2 + + layer Au +2 Electrode Pt +3 Electrode line Ni-Cr alloy +4 Heater coil Al2O3 +5 Tubular ceramic Stainless steel gauze +6 Anti-explosion (SUS316 100-mesh) + Copper plating Ni + network Bakelite +7 Clamp ring Copper plating Ni +8 Resin base +9 Tube Pin + +Configuration A Fig. 1 + + Configuration B + + A向 A向 + + Structure and configuration of MQ-135 gas sensor is shown as Fig. 1 (Configuration A or B), sensor composed +by micro AL2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a +crust made by plastic and stainless steel net. The heater provides necessary work conditions for work of + +TEL: 86-371-67169070 67169080 FAX: 86-371-67169090 E-mail: sales@hwsensor.com + HANWEI ELCETRONICS CO.,LTD MQ-135 http://www.hwsensor.com + +sensitive components. The enveloped MQ-135 have 6 pin ,4 of them are used to fetch signals, and other 2 are used + +for providing heating current. + + Electric parameter measurement circuit is shown as Fig.2 + + E. Sensitivity characteristic curve + + Fig.2 sensitivity characteristics of the MQ-135 + +10 MQ-135 Fig.3 is shows the typical + sensitivity characteristics of + + the MQ-135 for several gases. + + AIR in their: Temp: 20℃、 + CO2 Humidity: 65%、 + CO + Alc ohol O2 concentration 21% + NH4 RL=20kΩ + + Tolueno Ro: sensor resistance at 100ppm of + NH3 in the clean air. + + Rs:sensor resistance at various + +Rs/Ro Acetona concentrations of gases. + + 1 + + ppm + +0.1 100 1000 + 10 + + 1.8 + + 1.6 Fig.4 is shows the typical dependence of + 33%RH the MQ-135 on temperature and humidity. + 1.4 85%RH Ro: sensor resistance at 100ppm of NH3 in air + + Rs/Ro 1.2 + + 1 at 33%RH and 20 degree. + + 0.8 Rs: sensor resistance at 100ppm of NH3 + + 0.6 at different temperatures and humidities. + + 0.4 Fig.4 + + 0.2 degree + + 0 + + -20 -10 0 10 20 30 40 50 60 + +SENSITIVITY ADJUSTMENT + Resistance value of MQ-135 is difference to various kinds and various concentration gases. So,When using + +this components, sensitivity adjustment is very necessary. we recommend that you calibrate the detector for +100ppm NH3 or 50ppm Alcohol concentration in air and use value of Load resistancethat( RL) about 20 KΩ(10KΩ +to 47 KΩ). + + When accurately measuring, the proper alarm point for the gas detector should be determined after +considering the temperature and humidity influence. + +TEL: 86-371-67169070 67169080 FAX: 86-371-67169090 E-mail: sales@hwsensor.com + Notification + +1 Following conditions must be prohibited +1.1 Exposed to organic silicon steam + + Organic silicon steam cause sensors invalid, sensors must be avoid exposing to silicon bond, +fixature, silicon latex, putty or plastic contain silicon environment + +1.2 High Corrosive gas + + If the sensors exposed to high concentration corrosive gas (such as H2Sz, SOX，Cl2，HCl etc), it will +not only result in corrosion of sensors structure, also it cause sincere sensitivity attenuation. + +1.3 Alkali, Alkali metals salt, halogen pollution + + The sensors performance will be changed badly if sensors be sprayed polluted by alkali metals salt +especially brine, or be exposed to halogen such as fluorin. + +1.4 Touch water + Sensitivity of the sensors will be reduced when spattered or dipped in water. + +1.5 Freezing + Do avoid icing on sensor’surface, otherwise sensor would lose sensitivity. + +1.6 Applied voltage higher + + Applied voltage on sensor should not be higher than stipulated value, otherwise it cause down-line or +heater damaged, and bring on sensors’ sensitivity characteristic changed badly. + +1.7 Voltage on wrong pins + For 6 pins sensor, if apply voltage on 1、3 pins or 4、6 pins, it + +will make lead broken, and without signal when apply on 2、4 pins + +2 Following conditions must be avoided +2.1 Water Condensation + + Indoor conditions, slight water condensation will effect sensors performance lightly. However, if water +condensation on sensors surface and keep a certain period, sensor’ sensitivity will be decreased. + +2.2 Used in high gas concentration + No matter the sensor is electrified or not, if long time placed in high gas concentration, if will affect + +sensors characteristic. + +2.3 Long time storage + The sensors resistance produce reversible drift if it’s stored for long time without electrify, this drift is + +related with storage conditions. Sensors should be stored in airproof without silicon gel bag with clean air. +For the sensors with long time storage but no electrify, they need long aging time for stbility before using. + +2.4 Long time exposed to adverse environment + No matter the sensors electrified or not, if exposed to adverse environment for long time, such as + +high humidity, high temperature, or high pollution etc, it will effect the sensors performance badly. + +2.5 Vibration + Continual vibration will result in sensors down-lead response then repture. In transportation or + +assembling line, pneumatic screwdriver/ultrasonic welding machine can lead this vibration. + +2.6 Concussion + If sensors meet strong concussion, it may lead its lead wire disconnected. + +2.7 Usage + For sensor, handmade welding is optimal way. If use wave crest welding should meet the following + +conditions: + 2.7.1 Soldering flux: Rosin soldering flux contains least chlorine + 2.7.2 Speed: 1-2 Meter/ Minute + 2.7.3 Warm-up temperature：100±20℃ + 2.7.4 Welding temperature：250±10℃ + 2.7.5 1 time pass wave crest welding machine + +If disobey the above using terms, sensors sensitivity will be reduced. + diff --git a/Datasheets/MQ2.pdf b/Datasheets/MQ2 - Pololulu.pdf similarity index 100% rename from Datasheets/MQ2.pdf rename to Datasheets/MQ2 - Pololulu.pdf diff --git a/Datasheets/MQ3 - Sparkfun.pdf b/Datasheets/MQ3 - Sparkfun.pdf new file mode 100644 index 0000000..cebb56b --- /dev/null +++ b/Datasheets/MQ3 - Sparkfun.pdf @@ -0,0 +1,170 @@ +HANWEI ELETRONICS CO.,LTD MQ-3 http://www.hwsensor.com + +TECHNICAL DATA MQ-3 GAS SENSOR + +FEATURES + +* High sensitivity to alcohol and small sensitivity to Benzine . + +* Fast response and High sensitivity + +* Stable and long life + +* Simple drive circuit + +APPLICATION + +They are suitable for alcohol checker, Breathalyser. + +SPECIFICATIONS + +A. Standard work condition + +Symbol Parameter name Technical condition Remarks + 5V±0.1 AC OR DC +Vc Circuit voltage 5V±0.1 ACOR DC + 200KΩ +VH Heating voltage Room Tem + 33Ω±5% +RL Load resistance Remarks + less than 750mw +RH Heater resistance minimum value is + over 2% +PH Heating consumption + Remarks + B. Environment condition Detecting concentration + +Symbol Parameter name Technical condition scope： + Tao Using Tem -10℃-50℃ 0.05mg/L—10mg/L + Alcohol +Tas Storage Tem -20℃-70℃ + +RH Related humidity less than 95%Rh + +O2 Oxygen concentration 21%(standard condition)Oxygen + + concentration can affect sensitivity + +C. Sensitivity characteristic + +Symbol Parameter name Technical parameter + Rs Sensing Resistance 1MΩ- 8 MΩ + + (0.4mg/L alcohol ) + + α Concentration slope rate ≤0.6 + +(0.4/1 mg/L) + +Standard Temp: 20℃±2℃ Vc:5V±0.1 +detecting Humidity: 65%±5% Vh: 5V±0.1 +condition +Preheat time Over 24 hour + +D. Structure and configuration, basic measuring circuit + + Parts Materials Fig.2 +1 Gas sensing SnO2 + + layer Au +2 Electrode Pt +3 Electrode line Ni-Cr alloy +4 Heater coil Al2O3 +5 Tubular ceramic Stainless steel gauze +6 Anti-explosion (SUS316 100-mesh) + Copper plating Ni + network Bakelite +7 Clamp ring Copper plating Ni +8 Resin base +9 Tube Pin + +Configuration A Fig. 1 + + Configuration B + + A向 A向 +TEL: 86-371- 67169070 67169080 FAX: 86-371-67169090 + E-mail: sales@hwsensor.com + HANWEI ELETRONICS CO.,LTD MQ-3 http://www.hwsensor.com + +Structure and configuration of MQ-3 gas sensor is shown as Fig. 1 (Configuration A or B), sensor composed by +micro AL2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a +crust made by plastic and stainless steel net. The heater provides necessary work conditions for work of +sensitive components. The enveloped MQ-3 have 6 pin ,4 of them are used to fetch signals, and other 2 are used +for providing heating current. + + Electric parameter measurement circuit is shown as Fig.2 + + E. Sensitivity characteristic curve + + MQ-3 + +100 + + Fig.3 is shows the typical + + sensitivity characteristics of + + Alcohol the MQ-3 for several gases. + + Benzine in their: Temp: 20℃、 + + CH4 Humidity: 65%、 + +10 Hexane O2 concentration 21% + RL=200kΩ + LPG + Ro: sensor resistance at 0.4mg/L of + +Rs/Ro CO Alcohol in the clean air. + + Air Rs:sensor resistance at various + + concentrations of gases. + + 1 + +0.1 1 mg/L 10 + 0.1 + + Fig.2 sensitivity characteristics of the MQ-3 + + 1.70 Rs/Ro--Temp Fig.4 is shows the typical + dependence of the MQ-3 on + 1.60 temperature and humidity. + + 1.50 33%RH Ro: sensor resistance at 0.4mg/L of + 85%RH Alcohol in air at 33%RH and 20 ℃ + 1.40 + Rs: sensor resistance at 0.4mg/L of + 1.30 Alcohol at different temperatures + and humidities. +Rs/Ro 1.20 + + 1.10 + + 1.00 + 0.90 + + 0.80 Fig.4 + + 0.70 + + 0.60 Temp + 0.50 + + -10 0 10 20 30 40 50 60 + +SENSITVITY ADJUSTMENT + Resistance value of MQ-3 is difference to various kinds and various concentration gases. So,When using + +this components, sensitivity adjustment is very necessary. we recommend that you calibrate the detector for +0.4mg/L ( approximately 200ppm ) of Alcohol concentration in air and use value of Load resistancethat( RL) about + +200 KΩ(100KΩ to 470 KΩ). + + When accurately measuring, the proper alarm point for the gas detector should be determined after +considering the temperature and humidity influence. + +TEL: 86-371- 67169070 67169080 FAX: 86-371-67169090 E-mail: sales@hwsensor.com + diff --git a/Datasheets/MQ3.pdf b/Datasheets/MQ3.pdf deleted file mode 100644 index 95c2c53..0000000 --- a/Datasheets/MQ3.pdf +++ /dev/null @@ -1,165 +0,0 @@ - MQ-3 Semiconductor Sensor for Alcohol - - Sensitive material of MQ-3 gas sensor is SnO2, which with lower conductivity in clean air. When the -target alcohol gas exist, The sensor’s conductivity is more higher along with the gas concentration rising. -Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas -concentration. - - MQ-3 gas sensor has high sensitity to Alcohol, and has good resistance to disturb of gasoline, smoke -and vapor. The sensor could be used to detect alcohol with different concentration, it is with low cost and -suitable for different application. - -Character Configuration - -* Good sensitivity to alcohol gas -* Long life and low cost -* Simple drive circuit - -Application - -* Vehicel alcohol detector -* Portable alcohol detector - -Technical Data -Basic test loop - - Model No. MQ-3 Vc VRL - Semiconductor - Sensor Type Bakelite (Black Bakelite) - -Standard Encapsulation Alcohol gas - 0.04-4mg/l alcohol - Detection Gas RL - ≤24V DC VH - Concentration 5.0V±0.2V AC or DC - GND - Loop Voltage Vc Adjustable - The above is basic test circuit of the sensor. -Circuit Heater Voltage VH 31Ω±3Ω（Room Tem.） The sensor need to be put 2 voltage, - Load heater voltage（VH）and test voltage（VC）. - RL ≤900mW VH used to supply certified working - temperature to the sensor, while VC used - Resistance 2KΩ-20KΩ(in 0.4mg/l alcohol ) to detect voltage (VRL) on load resistance - （RL）whom is in series with sensor. The - Heater Rs(in air)/Rs(0.4mg/L sensor has light polarity, Vc need DC - RH Alcohol)≥5 power. VC and VH could use same power - circuit with precondition to assure - Resistance ≤0.6(R300ppm/R100ppm Alcohol) performance of sensor. In order to make - 20℃±2℃；65%±5%RH the sensor with better performance, - Heater Vc:5.0V±0.1V； suitable RL value is needed: - PH VH: 5.0V±0.1V Power of Sensitivity body(Ps): - Over 48 hours - consumption - -Character Sensing - Rs - - Resistance - - Sensitivity S - - Slope α - - Tem. Humidity - -Condition Standard test circuit - - Preheat time -Ps=Vc2×Rs/(Rs+RL)2 - Resistance of sensor(Rs): Rs=(Vc/VRL-1)×RL Influence of Temperature/Humidity - - Sensitivity Characteristics - -Fig.1 shows the typical sensitivity characteristics of Fig.2 shows the typical temperature and humidity -the MQ-3, ordinate means resistance ratio of the sensor characteristics. Ordinate means resistance ratio - of the sensor (Rs/Ro), Rs means resistance of sensor -(Rs/Ro), abscissa is concentration of gases. Rs means in 0.4mg/l alcohol under different tem. and humidity. - Ro means resistance of the sensor in environment of -resistance in different gases, Ro means resistance of 0.4mg/l alcohol, 20℃/65%RH -sensor in 0. 4mg/l alcohol. All test are under standard -test conditions. -P.S.: Sensitivity to smoke is ignite 10pcs cigarettes in 8m3 -room, and the output equals to 0.1mg/l alcohol - -Structure and configuration - -Structure and configuration of MQ-3 gas sensor is shown as Fig. 3, sensor composed by micro AL2O3 ceramic tube, Tin -Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a crust made by plastic and stainless steel -net. The heater provides necessary work conditions for work of sensitive components. The enveloped MQ-4 have 6 pin, 4 -of them are used to fetch signals, and other 2 are used for providing heating current. - Notification - -1 Following conditions must be prohibited -1.1 Exposed to organic silicon steam - - Organic silicon steam cause sensors invalid, sensors must be avoid exposing to silicon bond, -fixature, silicon latex, putty or plastic contain silicon environment - -1.2 High Corrosive gas - - If the sensors exposed to high concentration corrosive gas (such as H2Sz, SOX，Cl2，HCl etc), it will -not only result in corrosion of sensors structure, also it cause sincere sensitivity attenuation. - -1.3 Alkali, Alkali metals salt, halogen pollution - - The sensors performance will be changed badly if sensors be sprayed polluted by alkali metals salt -especially brine, or be exposed to halogen such as fluorin. - -1.4 Touch water - Sensitivity of the sensors will be reduced when spattered or dipped in water. - -1.5 Freezing - Do avoid icing on sensor’surface, otherwise sensor would lose sensitivity. - -1.6 Applied voltage higher - - Applied voltage on sensor should not be higher than stipulated value, otherwise it cause down-line or -heater damaged, and bring on sensors’ sensitivity characteristic changed badly. - -1.7 Voltage on wrong pins - For 6 pins sensor, if apply voltage on 1、3 pins or 4、6 pins, it - -will make lead broken, and without signal when apply on 2、4 pins - -2 Following conditions must be avoided -2.1 Water Condensation - - Indoor conditions, slight water condensation will effect sensors performance lightly. However, if water -condensation on sensors surface and keep a certain period, sensor’ sensitivity will be decreased. - -2.2 Used in high gas concentration - No matter the sensor is electrified or not, if long time placed in high gas concentration, if will affect - -sensors characteristic. - -2.3 Long time storage - The sensors resistance produce reversible drift if it’s stored for long time without electrify, this drift is - -related with storage conditions. Sensors should be stored in airproof without silicon gel bag with clean air. -For the sensors with long time storage but no electrify, they need long aging time for stbility before using. - -2.4 Long time exposed to adverse environment - No matter the sensors electrified or not, if exposed to adverse environment for long time, such as - -high humidity, high temperature, or high pollution etc, it will effect the sensors performance badly. - -2.5 Vibration - Continual vibration will result in sensors down-lead response then repture. In transportation or - -assembling line, pneumatic screwdriver/ultrasonic welding machine can lead this vibration. - -2.6 Concussion - If sensors meet strong concussion, it may lead its lead wire disconnected. - -2.7 Usage - For sensor, handmade welding is optimal way. If use wave crest welding should meet the following - -conditions: - 2.7.1 Soldering flux: Rosin soldering flux contains least chlorine - 2.7.2 Speed: 1-2 Meter/ Minute - 2.7.3 Warm-up temperature：100±20℃ - 2.7.4 Welding temperature：250±10℃ - 2.7.5 1 time pass wave crest welding machine - -If disobey the above using terms, sensors sensitivity will be reduced. - diff --git a/Datasheets/MQ303A - Hanwei.pdf b/Datasheets/MQ303A - Hanwei.pdf new file mode 100644 index 0000000..90b28cc --- /dev/null +++ b/Datasheets/MQ303A - Hanwei.pdf @@ -0,0 +1,103 @@ +HANWEI ELETRONICS CO.,LTD MQ-303A http://www.hwsensor.com + +GAS SENSOR MQ-303A for ALCOHOL DETECTION + + * High sensitivity + * Low power consumption + * Miniature-size + + The MQ-303A is a tin dioxide semiconductor gas +sensor which has a high sensitivity to alcohol with quick +response speed. This model is suitable for alcohol +detection such as portable breath alcohol checker or +ignition locking system in automobiles. + +Structure + + Gas sensitive semiconductor material is a mini bead type and a heater coil and electrode wire are embedded +in the element. The sensing element is installed in the metal housing which uses double stainless steel mesh (100 +mesh) in the path of gas flow. The mesh is an anti-explosion feature +(Fig 1). + +Operating conditions + + Fig 2 shows the standard operating circuit for this model. The +change of the sensor resistance (RS) is obtained as the change of the +output voltage across the fixed or variable resistor (RL). In order to +obtain the best performance and specified characteristics, the values +of the heater voltage (VH) circuit voltage (VC) and load resistance (RL) +must be within the range of values given in the standard operating +conditions shown in the Specification table on the next page. Generally, +the sensor enters into normal working conditions after several minutes’ +preheating, If you connect the sensor heater with a high voltage 2.2 ± +0.20V for 5-10 sec before normal testing , the sensor shall stabilize and +enter into normal working conditions quickly. + +Sensitivity characteristics + +Fig 3 shows the sensitivity characteristics curves of the MQ-303A (typical data). Sensitivity characteristics of the +gas sensors are expressed by the relationship between the sensor resistance and gas +concentration. The sensor resistance decreases with an increase of gas +concentration based on a logarithmic function. + +TEL: 86-371-67169070 67169080 FAX: 86-371-67169090 E-mail: sensor@371.net + HANWEI ELETRONICS CO.,LTD MQ-303A http://www.hwsensor.com + +A. Standard Operating conditions + +Symbol Parameter Specification Conditions etc. +VH Heater voltage 0.9V ± 0.10V AC or DC +VC Circuit voltage Less than 6 V DC (polarity is important) +RL Load resistance Variable P S < 10 mW +RH Heater resistance 4.5 Ω ± 0.5 Ω at room temperature + Less than 130 mA +IH Heater current Less than 130 mW IH = VH / RH (typical value) +PH Heater power consumption Less than 10 mW P H = V H 2 / R H (typical value) +PS Power dissipation of sensing element + P S = (V C - V RL ) 2/ R S + +B. Environmental conditions + +Symbol Parameter Specification Conditions etc. + +Tao Operating temperature -10 o C to 50 o C + +Tas Storage temp -20 o C to 70 o C Recommended range + +RH Relative humidity Less than 70% RH + +(O2) Oxygen concentration 21%±1%(Standard condition) Absolute minimum level: more then 18% + + The sensitivity characteristics are influenced by the variation in oxygen concentration. + +C. Sensitivity characteristics + +Model MQ-303A (tentative specifications) + +Symbol Parameter Specification Conditions etc. + (20kΩ to 200 kΩ) at ethanol 300 ppm +Rs Sensor resistance Rs (at ethanol 300 ppm) / Rs (at ethanol 50 ppm) + +β Sensitivity (0.50 ± 0.15) Specifications + Should satisfy the +Standard Test Conditions: Temp: 20 o C ± 2 o C V C : 5.0 V ± 1% specifications shown in the + sensitivity characteristics. + Humidity: 65% ± 5% V H : 0.9 V ± 1% + + (in clean air) R L : 50K Ω ±5% + + Pre-heating time: more than 48 hours + +D. Mechanical characteristics + + Items Conditions + +Vibration Frequency: 100 cpm + Vertical amplitude: 4 mm + Duration: 1 hour + +Shock Acceleration: 100G + Number of impacts: 5 times + +TEL: 86-371-67169070 67169080 FAX: 86-371-67169090 E-mail: sensor@371.net + diff --git a/Datasheets/MQ309A - Hanwei.pdf b/Datasheets/MQ309A - Hanwei.pdf new file mode 100644 index 0000000..5a7f8ad --- /dev/null +++ b/Datasheets/MQ309A - Hanwei.pdf @@ -0,0 +1,115 @@ +HANWEI ELETRONICS CO.,LTD MQ309A http://www.hwsensor.com + + MQ309A + +for CARBON MONOXIDE(CO) and Methane Detection + +General Information + +MQ309A is a tin dioxide semiconductor gas sensor which has excellent performance in +detecting both CO and Methane. It is miniature sensor adopt changing working +temperature periodically to detect with high sensitivity and selectivity, the humidity has +little influence on it. + +Configuration + + Gas sensor sensitivity material is a mini bead, a heater coil and electrode wire are +embedded in the element this element is installed in the in the metal housing which uses +double stainless steel mesh(100mesh) with anti-explosion function. As figure1 + +Operating condictions + + When the gas sensor is operatedwith high/low +periodic operation (As figure 2), sensor signal changes +according to its temperature dependency By detecting +the sensors signal at sufficient timmings (at high +temperature for methane and at a low temperature for +CO),selective detection of both methane and CO has +been achieved. Figs 3 and 3b show the sensitivity +characteristics of the MQ309A, at high temperature and +at low temperature signals respectively. + +TEL: 86-371-5333098 5333099 FAX: 86-371-5333090 E-mail: sensor@371.net + HANWEI ELETRONICS CO.,LTD MQ309A http://www.hwsensor.com + +A Standard working conditions + +Symbol Parament Specifications Remarks + AC or DC +VH(H) Heater voltage high 0.9V ± 0.10V + DC (polarity is +VH(L) Heater voltage Low 0.2 V ? ?5% important) + +VC Circuit Voltage =6V P S < 10 mW + Adjustable (> 10 +RL Load resistance ? ? ?) At room temperature + 4.0 ? ???1.0 ? +RH Heater Resistance 30sec ± 5 sec Before switching to + Heating time hihg 120 sec ± 10sec Low +TH (H) Heating time low < 1 sec +TH (L) Detecting time low VH=0.9V +DT (L) VH=0.2V + +I (H) Currentconsumption high =80mA P S = (V C - V RL ) 2/ Rs + +I (L) Current Consumption low 40? ?mW + +PS Power siddipation =10 mW + +TEL: 86-371-5333098 5333099 FAX: 86-371-5333090 E-mail: sensor@371.net + HANWEI ELETRONICS CO.,LTD MQ309A http://www.hwsensor.com + +B. Environmental Conditions + +Symbol Parameter Specification Remarks + -20 o C to 50 o C +Tao Operating + + Temperature Recommended range + +Tas Storage -20 o C to 70 o C + + temperature + +RH Relative 95% RH + + Humidity + +(O2) Oxygen 21% 1%(Standard Terms) Absolute Minimum + + Concentration The sensitivity character are Level: more than18% + + influenced by the variation in + + OXYGEN concentration + +C. Sensitivity + +Mosel MQ-309 + +Symbol Parament Specifications Remarks + +Rs Sensor resistance at (20k? ??to 200 In 200 ppm CO + + low period k? ) + +? ?(100-300) Sensitivity 1.05 to 2.1 Rs (300 ppmCO) / Rs (100 + Slope(30-100PPM) ppm CO) + + ? ?(3000-5000) Sensitivity slope at Low 0.75 to 1.2 Rs(5000 ppm CH4) + /Rs(3000ppm CH4) +Standard test Conditions : Temperature: 20 o C ? ?2 o C V C : 5.0 V ? ?1% + + Humidity: 65% ? ?5% V H : 0.9 V ? ?1% + + R L : 50K ? ?? 5% + Preheating time more than 48 hours + +HANWEI ELETRONICS CO.,LTD + +TEL:+86-371-8732420 8732424 6953352 +FAX:+86-371-8730444 6962121 +Email:sensor@371.net http://www.hwsensor.com + +TEL: 86-371-65333098 65333099 FAX: 86-371-65333090 E-mail: sensor@371.net + diff --git a/Datasheets/MQ4 - Sparkfun.pdf b/Datasheets/MQ4 - Sparkfun.pdf new file mode 100644 index 0000000..1bda875 --- /dev/null +++ b/Datasheets/MQ4 - Sparkfun.pdf @@ -0,0 +1,155 @@ +HANWEI ELECTRONICS MQ-4 www.hwsensor.com + +TECHNICAL DATA MQ-4 GAS SENSOR + +FEATURES + +* High sensitivity to CH4，Natural gas. +* Small sensitivity to alcohol, smoke. + +* Fast response . * Stable and long life * Simple drive circuit + +APPLICATION + +They are used in gas leakage detecting equipments in family and industry, are suitable for detecting of + +CH4,Natural gas.LNG, avoid the noise of alcohol and cooking fumes and cigarette smoke. + +SPECIFICATIONS + +A. Standard work condition + +Symbol Parameter name Technical condition Remarks + Vc Circuit voltage 5V±0.1 AC OR DC + VH Heating voltage 5V±0.1 ACOR DC + PL Load resistance + RH 20KΩ Room Tem + Heater resistance + 33Ω±5% + +PH Heating consumption less than 750mw + + B. Environment condition + +Symbol Parameter name Technical condition Remarks + Tao Using Tem -10℃-50℃ + +Tas Storage Tem -20℃-70℃ + +RH Related humidity less than 95%Rh + +O2 Oxygen concentration 21%(standard condition)Oxygen minimum value is + + concentration can affect sensitivity over 2% + +C. Sensitivity characteristic + +Symbol Parameter name Technical parameter Ramark 2 + Rs Sensing Resistance 10KΩ- 60KΩ Detecting concentration + scope： + (1000ppm CH4 ) + 200-10000ppm + + α ≤0.6 CH4 , natural gas +(1000ppm/ + Concentration slope rate + +5000ppm CH4) Temp: 20℃±2℃ Vc:5V±0.1 +Standard Humidity: 65%±5% Vh: 5V±0.1 +detecting +condition + +Preheat time Over 24 hour + +D. Strucyure and configuration, basic measuring circuit + + Parts Materials Fig.2 +1 Gas sensing SnO2 + + layer Au +2 Electrode Pt +3 Electrode line Ni-Cr alloy +4 Heater coil Al2O3 +5 Tubular ceramic Stainless steel gauze +6 Anti-explosion (SUS316 100-mesh) + Copper plating Ni + network Bakelite +7 Clamp ring Copper plating Ni +8 Resin base +9 Tube Pin + +Configuration A Fig. 1 + + Configuration B + +TEL:86-371-67169080 A向 A向 + FAX: 86-371-67169090 + E-mail: sales@hwsensor.com + HANWEI ELECTRONICS MQ-4 www.hwsensor.com + + Structure and configuration of MQ-4 gas sensor is shown as Fig. 1 (Configuration A or B), sensor composed by +micro AL2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a +crust made by plastic and stainless steel net. The heater provides necessary work conditions for work of +sensitive components. The enveloped MQ-4 have 6 pin ,4 of them are used to fetch signals, and other 2 are used +for providing heating current. + + Electric parameter measurement circuit is shown as Fig.2 + + E. Sensitivity characteristic curve + + MQ-4 + +10 + + 1Rs/Ro LPG Fig.3 is shows the typical + CH4 sensitivity characteristics of +0.1 H2 the MQ-4 for several gases. + 100 CO + alcohol in their: Temp: 20℃、 + smoke Humidity: 65%、 + Air O2 concentration 21% + RL=20kΩ + 1000 Ro: sensor resistance at 1000ppm of + CH4 in the clean air. + Rs:sensor resistance at various + concentrations of gases. + + ppm + + 10000 + + Fig.2 sensitivity characteristics of the MQ-4 + + 1.4 MQ-4 33%RH + 85%RH + 1.3 Fig.4 is shows the typical dependence of + + 1.2 the MQ-4 on temperature and humidity. + + 1.1 Ro: sensor resistance at 1000ppm of CH4 in air + at 33%RH and 20 degree. + Rs/Ro 1 + Rs: sensor resistance at 1000ppm of CH4 in air + 0.9 at different temperatures and humidities. + + 0.8 Fig.4 + + 0.7 + + 0.6 + + 0.5 + + -10 0 10 20 Temp 30 40 50 + +SENSITVITY ADJUSTMENT + Resistance value of MQ-4 is difference to various kinds and various concentration gases. So,When using + +this components, sensitivity adjustment is very necessary. we recommend that you calibrate the detector for +5000ppm of CH4 concentration in air and use value of Load resistance ( RL) about 20KΩ(10KΩ to 47KΩ). + + When accurately measuring, the proper alarm point for the gas detector should be determined after +considering the temperature and humidity influence. + +TEL:86-371-67169080 FAX: 86-371-67169090 E-mail: sales@hwsensor.com + diff --git a/Datasheets/MQ4.pdf b/Datasheets/MQ4.pdf deleted file mode 100644 index 14ae6d1..0000000 --- a/Datasheets/MQ4.pdf +++ /dev/null @@ -1,209 +0,0 @@ -Henan Hanwei Electronics Co., Ltd www.hwsensor.com - - MQ-4 Semiconductor Sensor for Natural Gas - - Sensitive material of MQ-4 gas sensor is SnO2, which with lower conductivity in clean air. When the -target combustible gas exist, The sensor’s conductivity is more higher along with the gas concentration -rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of -gas concentration. - - MQ-4 gas sensor has high sensitity to Methane, also to Propane and Butane. The sensor could be -used to detect different combustible gas, especially Methane, it is with low cost and suitable for different -application. - -Character Configuration - -* Good sensitivity to Combustible gas in wide range -* High sensitivity to Natural gas -* Long life and low cost -* Simple drive circuit - -Application - -* Domestic gas leakage detector -* Industrial Combustible gas detector -* Portable gas detector - -Technical Data Basic test loop - - Model No. MQ-4 Vc VRL - - Sensor Type Semiconductor - -Standard Encapsulation Bakelite (Black Bakelite) - - Detection Gas Natural gas/ Methane RL - - Concentration 300-10000ppm VH - - ( Natural gas / Methane) - - Loop Voltage Vc ≤24V DC - 5.0V±0.2V ACorDC -Circuit Heater Voltage VH GND - Load Adjustable - RL The above is basic test circuit of the sensor. - 31Ω±3Ω（Room Tem.） The sensor need to be put 2 voltage, - Resistance heater voltage（VH）and test voltage（VC）. - ≤900mW VH used to supply certified working - Heater temperature to the sensor, while VC used - RH 2KΩ-20KΩ(in 5000ppm CH4 ) to detect voltage (VRL) on load resistance - Rs(in air)/Rs(5000ppm CH4)≥5 （RL）whom is in series with sensor. The - Resistance sensor has light polarity, Vc need DC - ≤0.6(R5000ppm/R3000ppm CH4) power. VC and VH could use same power - Heater 20℃±2℃；65%±5%RH circuit with precondition to assure - PH Vc:5.0V±0.1V； performance of sensor. In order to make - VH: 5.0V±0.1V the sensor with better performance, - consumption Over 48 hours suitable RL value is needed: -Character Power of Sensitivity body(Ps): - - Sensing - Rs - - Resistance - - Sensitivity S - - Slope α - - Tem. Humidity - -Condition Standard test circuit - - Preheat time - -Tel: 86-371-67169070/80 Fax: 86-371-67169090 Email: sales@hwsensor.com - Henan Hanwei Electronics Co., Ltd www.hwsensor.com - -Ps=Vc2×Rs/(Rs+RL)2 -Resistance of sensor(Rs): Rs=(Vc/VRL-1)×RL - -Sensitivity Characteristics Influence of Temperature/Humidity - - MQ-4 1.9 - -10 1.7 Fig2 - - Fig.1 - - 60%RH - - 1.5 30%RH - - 85%RH - -Rs/Ro 1.3 - - Rs/R0 - 1 LPG 1.1 - CH4 -0.1 H2 0.9 - 100 - C烟O 雾 0.7 - - alcohol ppm - smoke 10000 - Air - - 1000 0.5 - -20 -10 0 10 20 30 40 50 ℃ - -Fig.1 shows the typical sensitivity characteristics of Fig.2 shows the typical temperature and humidity -the MQ-4, ordinate means resistance ratio of the sensor characteristics. Ordinate means resistance ratio - of the sensor (Rs/Ro), Rs means resistance of sensor -(Rs/Ro), abscissa is concentration of gases. Rs means in 1000ppm Methane under different tem. and humidity. - Ro means resistance of the sensor in environment of -resistance in different gases, Ro means resistance of 1000ppm Methane, 20℃/65%RH -sensor in 1000ppm Methane. All test are under standard -test conditions. -P.S.: Sensitivity to smoke is ignite 10pcs cigarettes in 8m3 -room, and the output equals to 200ppm Methane - -Structure and configuration - -Structure and configuration of MQ-4 gas sensor is shown as Fig. 3, sensor composed by micro AL2O3 ceramic tube, Tin -Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a crust made by plastic and stainless steel -net. The heater provides necessary work conditions for work of sensitive components. The enveloped MQ-4 have 6 pin, 4 -of them are used to fetch signals, and other 2 are used for providing heating current. - -Tel: 86-371-67169070/80 Fax: 86-371-67169090 Email: sales@hwsensor.com - Henan Hanwei Electronics Co., Ltd www.hwsensor.com - -Notification - -1 Following conditions must be prohibited -1.1 Exposed to organic silicon steam - - Organic silicon steam cause sensors invalid, sensors must be avoid exposing to silicon bond, -fixature, silicon latex, putty or plastic contain silicon environment - -1.2 High Corrosive gas - - If the sensors exposed to high concentration corrosive gas (such as H2Sz, SOX，Cl2，HCl etc), it will -not only result in corrosion of sensors structure, also it cause sincere sensitivity attenuation. - -1.3 Alkali, Alkali metals salt, halogen pollution - - The sensors performance will be changed badly if sensors be sprayed polluted by alkali metals salt -especially brine, or be exposed to halogen such as fluorin. - -1.4 Touch water - Sensitivity of the sensors will be reduced when spattered or dipped in water. - -1.5 Freezing - Do avoid icing on sensor’surface, otherwise sensor would lose sensitivity. - -1.6 Applied voltage higher - - Applied voltage on sensor should not be higher than stipulated value, otherwise it cause down-line or -heater damaged, and bring on sensors’ sensitivity characteristic changed badly. - -1.7 Voltage on wrong pins - For 6 pins sensor, if apply voltage on 1、3 pins or 4、6 pins, it - -will make lead broken, and without signal when apply on 2、4 pins - -2 Following conditions must be avoided -2.1 Water Condensation - - Indoor conditions, slight water condensation will effect sensors performance lightly. However, if water -condensation on sensors surface and keep a certain period, sensor’ sensitivity will be decreased. - -2.2 Used in high gas concentration - No matter the sensor is electrified or not, if long time placed in high gas concentration, if will affect - -sensors characteristic. - -2.3 Long time storage - The sensors resistance produce reversible drift if it’s stored for long time without electrify, this drift is - -related with storage conditions. Sensors should be stored in airproof without silicon gel bag with clean air. -For the sensors with long time storage but no electrify, they need long aging time for stbility before using. - -2.4 Long time exposed to adverse environment - No matter the sensors electrified or not, if exposed to adverse environment for long time, such as - -high humidity, high temperature, or high pollution etc, it will effect the sensors performance badly. - -2.5 Vibration - Continual vibration will result in sensors down-lead response then repture. In transportation or - -assembling line, pneumatic screwdriver/ultrasonic welding machine can lead this vibration. - -2.6 Concussion - If sensors meet strong concussion, it may lead its lead wire disconnected. - -2.7 Usage - For sensor, handmade welding is optimal way. If use wave crest welding should meet the following - -conditions: - 2.7.1 Soldering flux: Rosin soldering flux contains least chlorine - 2.7.2 Speed: 1-2 Meter/ Minute - 2.7.3 Warm-up temperature：100±20℃ - 2.7.4 Welding temperature：250±10℃ - - 2.7.5 1 time pass wave crest welding machine -If disobey the above using terms, sensors sensitivity will be reduced. - -Tel: 86-371-67169070/80 Fax: 86-371-67169090 Email: sales@hwsensor.com - diff --git a/Datasheets/MQ-5.pdf b/Datasheets/MQ5 - Parallax.pdf similarity index 100% rename from Datasheets/MQ-5.pdf rename to Datasheets/MQ5 - Parallax.pdf diff --git a/Datasheets/MQ6 - Sparkfun.pdf b/Datasheets/MQ6 - Sparkfun.pdf new file mode 100644 index 0000000..e1846f3 --- /dev/null +++ b/Datasheets/MQ6 - Sparkfun.pdf @@ -0,0 +1,149 @@ +HANWEI SENSORS MQ-6 www.hwsensor.com + +TECHNICAL DATA MQ-6 GAS SENSOR + +FEATURES + + * High sensitivity to LPG, iso-butane, propane + + * Small sensitivity to alcohol, smoke. + + * Fast response . * Stable and long life * Simple drive circuit + +APPLICATION + +They are used in gas leakage detecting equipments in family and industry, are suitable for detecting of + +LPG, iso-butane, propane, LNG, avoid the noise of alcohol and cooking fumes and cigarette smoke. + +SPECIFICATIONS + + A. Standard work condition + +Symbol Parameter name Technical condition Remarks + 5V±0.1 AC OR DC +Vc Circuit voltage 5V±0.1 ACOR DC + 20KΩ +VH Heating voltage Room Tem + 33Ω±5% +PL Load resistance + less than 750mw +RH Heater resistance + +PH Heating consumption + + B. Environment condition + +Symbol Parameter name Technical condition Remarks + Tao Using Tem -10℃-50℃ + Tas Storage Tem -20℃-70℃ + +RH Related humidity less than 95%Rh + +O2 Oxygen concentration 21%(standard condition)Oxygen minimum value is + + concentration can affect sensitivity over 2% + +C. Sensitivity characteristic + + Symbol Parameter name Technical parameter Remarks + Rs Sensing Resistance 10KΩ- 60KΩ Detecting concentration + scope： + α (1000ppm LPG ) 200-10000ppm + (1000ppm/ +4000ppm LPG) Concentration slope rate ≤0.6 LPG , iso-butane, +Standard propane, +detecting Temp: 20℃±2℃ Vc:5V±0.1 LNG +condition Humidity: 65%±5% Vh: 5V±0.1 + +Preheat time Over 24 hour + +D. Strucyure and configuration, basic measuring circuit + + Parts Materials Fig.2 +1 Gas sensing SnO2 + + layer Au +2 Electrode Pt +3 Electrode line Ni-Cr alloy +4 Heater coil Al2O3 +5 Tubular ceramic Stainless steel gauze +6 Anti-explosion (SUS316 100-mesh) + Copper plating Ni + network Bakelite +7 Clamp ring Copper plating Ni +8 Resin base +9 Tube Pin + +Configuration A Fig. 1 + + Configuration B + +TEL:86-371-67169080 FAX: 86-A3向71-67169090 E-mail:sales@Ah向wsensor.com + HANWEI SENSORS MQ-6 www.hwsensor.com + + Structure and configuration of MQ-6 gas sensor is shown as Fig. 1 (Configuration A or B), sensor composed by +micro AL2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a +crust made by plastic and stainless steel net. The heater provides necessary work conditions for work of +sensitive components. The enveloped MQ-6 have 6 pin ,4 of them are used to fetch signals, and other 2 are used +for providing heating current. + + Electric parameter measurement circuit is shown as Fig.2 + + E. Sensitivity characteristic curve + + Fig.2 sensitivity characteristics of the MQ-6 + +10 MQ-6 + +Rs/Ro 1 Fig.3 is shows the typical + sensitivity characteristics of + + the MQ-6 for several gases. + + in their: Temp: 20℃、 + Humidity: 65%、 + O2 concentration 21% + RL=20kΩ + + Ro: sensor resistance at 1000ppm of + LPG in the clean air. + + Rs:sensor resistance at various + concentrations of gases. + + LPG ppm + H2 + CH4 10000 + CO + Alcohol + Air + +0.1 1000 + 100 + +Rs/Ro 1.4 MQ-6 33%RH Fig.4 is shows the typical dependence of + 1.3 85%RH the MQ-6 on temperature and humidity. + 1.2 Fig.4 + 1.1 Ro: sensor resistance at 1000ppm of LPG in air + at 33%RH and 20 degree. + 1 + 0.9 Rs: sensor resistance at 1000ppm of LPG in air + 0.8 at different temperatures and humidities. + 0.7 + 0.6 + 0.5 + + -10 0 10 20 Temp 30 40 50 + +SENSITVITY ADJUSTMENT + Resistance value of MQ-6 is difference to various kinds and various concentration gases. So, When using + +this components, sensitivity adjustment is very necessary. we recommend that you calibrate the detector for +1000ppm of LPG concentration in air and use value of Load resistance ( RL) about 20KΩ(10KΩ to 47KΩ). + + When accurately measuring, the proper alarm point for the gas detector should be determined after +considering the temperature and humidity influence. + +TEL:86-371-67169080 FAX: 86-371-67169090 E-mail:sales@hwsensor.com + diff --git a/Datasheets/MQ6.pdf b/Datasheets/MQ6.pdf deleted file mode 100644 index 67a1028..0000000 --- a/Datasheets/MQ6.pdf +++ /dev/null @@ -1,167 +0,0 @@ - MQ-6 Semiconductor Sensor for LPG - - Sensitive material of MQ-6 gas sensor is SnO2, which with lower conductivity in clean air. When the -target combustible gas exist, The sensor’s conductivity is more higher along with the gas concentration -rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of -gas concentration. - - MQ-6 gas sensor has high sensitity to Propane, Butane and LPG, also response to Natural gas. The -sensor could be used to detect different combustible gas, especially Methane, it is with low cost and -suitable for different application. - -Character Configuration - -* Good sensitivity to Combustible gas in wide range -* High sensitivity to Propane, Butane and LPG -* Long life and low cost -* Simple drive circuit - -Application - -* Domestic gas leakage detector -* Industrial Combustible gas detector -* Portable gas detector - -Technical Data Basic test loop - - Model No. MQ-6 Vc VRL - - Sensor Type Semiconductor - -Standard Encapsulation Bakelite (Black Bakelite) - - Detection Gas Isobutane, Butane, LPG RL - - Concentration 300-10000ppm VH - - ( Butane, Propane, LPG) - - Loop Voltage Vc ≤24V DC - 5.0V±0.2V ACorDC -Circuit Heater Voltage VH GND - Load Adjustable - RL The above is basic test circuit of the sensor. - 31Ω±3Ω（Room Tem.） The sensor need to be put 2 voltage, - Resistance heater voltage（VH）and test voltage（VC）. - ≤900mW VH used to supply certified working - Heater temperature to the sensor, while VC used - RH 2KΩ-20KΩ(in 2000ppm C3H8) to detect voltage (VRL) on load resistance - Rs(in air)/Rs(1000ppm C4H10)≥5 （RL）whom is in series with sensor. The - Resistance sensor has light polarity, Vc need DC - ≤0.6( R /R 2000ppm 1000ppm LPG ) power. VC and VH could use same power - Heater 20℃±2℃；65%±5%RH circuit with precondition to assure - PH performance of sensor. In order to make - Vc:5.0V±0.1V； the sensor with better performance, - consumption VH: 5.0V±0.1V suitable RL value is needed: -Character Power of Sensitivity body(Ps): - Over 48 hours - Sensing - Rs - - Resistance - - Sensitivity S - - Slope α - - Tem. Humidity - -Condition Standard test circuit - - Preheat time - Ps=Vc2×Rs/(Rs+RL)2 Influence of Temperature/Humidity -Resistance of sensor(Rs): Rs=(Vc/VRL-1)×RL - - Sensitivity Characteristics - - Fig.1 shows the typical sensitivity characteristics of Fig.2 shows the typical temperature and humidity -the MQ-6, ordinate means resistance ratio of the sensor characteristics. Ordinate means resistance ratio -(Rs/Ro), abscissa is concentration of gases. Rs means -resistance in different gases, Ro means resistance of of the sensor (Rs/Ro), Rs means resistance of sensor -sensor in 1000ppm LPG. All test are under standard in 1000ppm Methane under different tem. and humidity. -test conditions. Ro means resistance of the sensor in environment of - - 1000ppm Propane, 20℃/65%RH - -Structure and configuration - -Structure and configuration of MQ-6 gas sensor is shown as Fig. 3, sensor composed by micro AL2O3 ceramic tube, Tin -Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a crust made by plastic and stainless steel -net. The heater provides necessary work conditions for work of sensitive components. The enveloped MQ-4 have 6 pin, 4 -of them are used to fetch signals, and other 2 are used for providing heating current. - Notification - -1 Following conditions must be prohibited -1.1 Exposed to organic silicon steam - - Organic silicon steam cause sensors invalid, sensors must be avoid exposing to silicon bond, -fixature, silicon latex, putty or plastic contain silicon environment - -1.2 High Corrosive gas - - If the sensors exposed to high concentration corrosive gas (such as H2Sz, SOX，Cl2，HCl etc), it will -not only result in corrosion of sensors structure, also it cause sincere sensitivity attenuation. - -1.3 Alkali, Alkali metals salt, halogen pollution - - The sensors performance will be changed badly if sensors be sprayed polluted by alkali metals salt -especially brine, or be exposed to halogen such as fluorin. - -1.4 Touch water - Sensitivity of the sensors will be reduced when spattered or dipped in water. - -1.5 Freezing - Do avoid icing on sensor’surface, otherwise sensor would lose sensitivity. - -1.6 Applied voltage higher - - Applied voltage on sensor should not be higher than stipulated value, otherwise it cause down-line or -heater damaged, and bring on sensors’ sensitivity characteristic changed badly. - -1.7 Voltage on wrong pins - For 6 pins sensor, if apply voltage on 1、3 pins or 4、6 pins, it - -will make lead broken, and without signal when apply on 2、4 pins - -2 Following conditions must be avoided -2.1 Water Condensation - - Indoor conditions, slight water condensation will effect sensors performance lightly. However, if water -condensation on sensors surface and keep a certain period, sensor’ sensitivity will be decreased. - -2.2 Used in high gas concentration - No matter the sensor is electrified or not, if long time placed in high gas concentration, if will affect - -sensors characteristic. - -2.3 Long time storage - The sensors resistance produce reversible drift if it’s stored for long time without electrify, this drift is - -related with storage conditions. Sensors should be stored in airproof without silicon gel bag with clean air. -For the sensors with long time storage but no electrify, they need long aging time for stbility before using. - -2.4 Long time exposed to adverse environment - No matter the sensors electrified or not, if exposed to adverse environment for long time, such as - -high humidity, high temperature, or high pollution etc, it will effect the sensors performance badly. - -2.5 Vibration - Continual vibration will result in sensors down-lead response then repture. In transportation or - -assembling line, pneumatic screwdriver/ultrasonic welding machine can lead this vibration. - -2.6 Concussion - If sensors meet strong concussion, it may lead its lead wire disconnected. - -2.7 Usage - For sensor, handmade welding is optimal way. If use wave crest welding should meet the following - -conditions: - 2.7.1 Soldering flux: Rosin soldering flux contains least chlorine - 2.7.2 Speed: 1-2 Meter/ Minute - 2.7.3 Warm-up temperature：100±20℃ - 2.7.4 Welding temperature：250±10℃ - 2.7.5 1 time pass wave crest welding machine - -If disobey the above using terms, sensors sensitivity will be reduced. - diff --git a/Datasheets/MQ7 - Sparkfun.pdf b/Datasheets/MQ7 - Sparkfun.pdf new file mode 100644 index 0000000..6066c2f --- /dev/null +++ b/Datasheets/MQ7 - Sparkfun.pdf @@ -0,0 +1,191 @@ +HANWEI ELECTRONICS CO ., LTD MQ –7 http://www.hwsensor.com + +TECHNICAL DATA MQ-7 GAS SENSOR + +FEATURES + + * High sensitivity to carbon monoxide + + * Stable and long life + +APPLICATION + + They are used in gas detecting equipment for carbon monoxide(CO) in family and + +industry or car. + +SPECIFICATIONS + + A. Standard work condition + +Symbol Parameter name Technical condition Remark +Vc circuit voltage 5V±0.1 Ac or Dc +VH (H) Heating voltage (high) 5V±0.1 Ac or Dc +VH (L) Heating voltage (low) 1.4V±0.1 Ac or Dc +RL Load resistance + Can adjust + +RH Heating resistance 33Ω±5% Room temperature +TH (H) Heating time (high) 60±1 seconds +TH (L) Heating time (low) 90±1 seconds +PH Heating consumption About 350mW + +b. Environment conditions + +Symbol Parameters Technical conditions Remark +Tao Using temperature -20℃-50℃ Advice using scope +Tas Storage temperature -20℃-50℃ Minimum value is over 2% +RH Relative humidity +O2 Oxygen concentration Less than 95%RH + 21%(stand condition) + the oxygen concentration can + affect the sensitivity + characteristic + +c. Sensitivity characteristic + +symbol Parameters Technical parameters Remark +Rs + Surface resistance In 100ppm +а(300/100ppm) +Standard working Of sensitive body 2-20k Carbon Monoxide +condition +Preheat time Concentration slope rate Less than 0.5 Rs (300ppm)/Rs(100ppm) + + Temperature -20℃±2℃ relative humidity 65%±5% RL:10KΩ±5% + + Vc:5V±0.1V VH:5V±0.1V VH:1.4V±0.1V + + No less than 48 hours Detecting range: + + 20ppm-2000ppm carbon monoxide + + D. Structure and configuration, basic measuring circuit + Structure and configuration of MQ-7 gas sensor is shown as Fig. 1 (Configuration A or B), + +sensor composed by micro AL2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, measuring +electrode and heater are fixed into a crust made by plastic and stainless steel net. The heater +provides necessary work conditions for work of sensitive components. The enveloped MQ-7 have + +TEL:86-371-67169070 67169080 FAX:86-371-67169090 Email: sales@hwsensor.com + HANWEI ELECTRONICS CO ., LTD MQ –7 http://www.hwsensor.com + +6 pin ,4 of them are used to fetch signals, and other 2 are used for providing heating current. + + Parts Materials + 1 Gas sensing SnO2 + + layer Au + 2 Electrode Pt + 3 Electrode line Ni-Cr alloy + 4 Heater coil Al2O3 + 5 Tubular ceramic Stainless steel gauze + 6 Anti-explosion (SUS316 100-mesh) + Copper plating Ni + network Bakelite + 7 Clamp ring Copper plating Ni + 8 Resin base + 9 Tube Pin + + Fig.1 + + A + + A + A向 + +VH Heating voltage 5v (High) 60s Standard circuit: + As shown in Fig 2, standard measuring circuit of + VRL MQ-7 sensitive components consists of 2 parts. one + is heating circuit having time control function (the + RL high voltage and the low voltage work + Vc circularly ). The second is the signal output circuit, + it can accurately respond changes of surface + Fig.2 resistance of the sensor. + +Heating voltage 1.4v (Low) 90s + +Electric parameter measurement circuit is shown as Fig.2 + E. Sensitivity characteristic curve + +100 MQ-7 + +10 Fig.3 is shows the typical + sensitivity characteristics of +Rs/Ro1 the MQ-7 for several gases. + + 0.1 CO ppm in their: Temp: 20℃、 + H2 Humidity: 65%、 +0.01 LPG 1000 10000 O2 concentration 21% + 10 CH4 RL=10kΩ + Alcohol Ro: sensor resistance at 100ppm + air + CO in the clean air. + 100 Rs: sensor resistance at various + + Fig.3 sensitivity characteristics of the MQ-7 concentrations of gases. + +TEL:86-371-67169070 67169080 FAX:86-371-67169090 Email: sales@hwsensor.com + HANWEI ELECTRONICS CO ., LTD MQ –7 http://www.hwsensor.com + + 1.5 MQ-7 Fig.4 is shows the typical + 1.4 dependence of the MQ-7 on + 1.3 33%RH Fig.4 temperature and humidity. + 85%RH + 1.2 Ro: sensor resistance at 100ppm CO in +Rs/Ro 1.1 air at 33%RH and 20degree. + Rs: sensor resistance at 100ppm CO at + 1 Temp different temperatures and humidities. + 0.9 + 0.8 + + 0.7 + 0.6 + 0.5 + + -10 0 10 20 30 40 50 + +OPERATION PRINCIPLE +. The surface resistance of the sensor Rs is obtained through effected voltage signal output of the +load resistance RL which series-wound. The relationship between them is described: + + Rs\RL = (Vc-VRL) / VRL +Fig. 5 shows alterable situation of RL signal output measured by using Fig. 2 circuit output + + In 100ppmCO In air + +VH5v In air +1.4v 60s 90s + +Signal + + Fig.5 + +signal when the sensor is shifted from clean air to carbon monoxide (CO) , output signal +measurement is made within one or two complete heating period (2.5 minute from high voltage +to low voltage ). + + Sensitive layer of MQ-7 gas sensitive components is made of SnO2 with stability, So, it has +excellent long term stability. Its service life can reach 5 years under using condition. +SENSITVITY ADJUSTMENT + + Resistance value of MQ-7 is difference to various kinds and various concentration gases. So, When +using this components, sensitivity adjustment is very necessary. we recommend that you calibrate the +detector for 200ppm CO in air and use value of Load resistance that( RL) about 10 KΩ(5KΩ to 47 KΩ). + + When accurately measuring, the proper alarm point for the gas detector should be determined after + considering the temperature and humidity influence. The sensitivity adjusting program: + + a. Connect the sensor to the application circuit. + b. Turn on the power, keep preheating through electricity over 48 hours. + c. Adjust the load resistance RL until you get a signal value which is respond to a certain + + carbon monoxide concentration at the end point of 90 seconds. + d. Adjust the another load resistance RL until you get a signal value which is respond to a CO + + concentration at the end point of 60 seconds . + + Supplying special IC solutions, More detailed technical information, please contact us. + + TEL:86-371-67169070 67169080 FAX:86-371-67169090 Email: sales@hwsensor.com + diff --git a/Datasheets/MQ7.pdf b/Datasheets/MQ7.pdf deleted file mode 100644 index 86e0039..0000000 --- a/Datasheets/MQ7.pdf +++ /dev/null @@ -1,198 +0,0 @@ -Henan Hanwei Electronics Co., Ltd www.hwsensor.com - - MQ-7 Semiconductor Sensor for Carbon Monoxide - - Sensitive material of MQ-7 gas sensor is SnO2, which with lower conductivity in clean air. It make -detection by method of cycle high and low temperature, and detect CO when low temperature (heated -by 1.5V). The sensor’s conductivity is more higher along with the gas concentration rising. When high -temperature (heated by 5.0V), it cleans the other gases adsorbed under low temperature. Please use -simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration. - - MQ-7 gas sensor has high sensitity to Carbon Monoxide. The sensor could be used to detect -different gases contains CO, it is with low cost and suitable for different application. - -Character Configuration - -*Good sensitivity to Combustible gas in wide range -* High sensitivity to Natural gas -* Long life and low cost -* Simple drive circuit - -Application - -* Domestic gas leakage detector -* Industrial CO detector -* Portable gas detector - -Technical Data Basic test loop - - Model No. MQ-7 Vc VRL - - Sensor Type Semiconductor - -Standard Encapsulation Plastic - - Detection Gas Carbon Monoxide RL - VH - Concentration 10-10000ppm CO - GND -Circuit Loop Voltage Vc ≤10V DC - Heater Voltage VH 5.0V±0.2V ACorDC（High） The above is basic test circuit of the sensor. - 1.5V±0.1V ACorDC（Low） The sensor need to be put 2 voltage, - Heater Time TL 60±1S（High）90±1S（Low） heater voltage（VH）and test voltage（VC）. - VH used to supply certified working - Load Adjustable temperature to the sensor, while VC used - RL to detect voltage (VRL) on load resistance - （RL）whom is in series with sensor. The - Resistance sensor has light polarity, Vc need DC - power. VC and VH could use same power - Heater 31Ω±3Ω（Room Tem.） circuit with precondition to assure - RH performance of sensor. In order to make - the sensor with better performance, - Resistance suitable RL value is needed: - Power of Sensitivity body(Ps): - Heater ≤350mW Ps=Vc2×Rs/(Rs+RL)2 - PH 2KΩ-20KΩ(in 100ppm CO ) - - consumption -Character - - Sensing - Rs - - Resistance - - Sensitivity S Rs(in air)/Rs(100ppm CO)≥5 - - Slope α ≤0.6(R300ppm/R100ppm CO) - 20℃±2℃；65%±5%RH - Tem. Humidity - - Vc:5.0V±0.1V； - -Condition Standard test circuit VH（High）: 5.0V±0.1V； - VH（Low）: 1.5V±0.1V - - Preheat time Over 48 hours - -Tel: 86-371-67169070/80 Fax: 86-371-67169090 Email: sales@hwsensor.com - Henan Hanwei Electronics Co., Ltd www.hwsensor.com - -Resistance of sensor(Rs): Rs=(Vc/VRL-1)×RL - - Sensitivity Characteristics Influence of Temperature/Humidity - -Fig.1 shows the typical sensitivity characteristics of 1.9 -the MQ-7, ordinate means resistance ratio of the sensor - 1.7 Fig2 60%RH -(Rs/Ro), abscissa is concentration of gases. Rs means - 1.5 30%RH -resistance in different gases, Ro means resistance of -sensor in 1000ppm Hydrogen. All test are under standard 85%RH -test conditions. - Rs/R0 1.3 - - 1.1 - - 0.9 - - 0.7 - - 0.5 - -20 -10 0 10 20 30 40 50 ℃ - - Fig.2 shows the typical temperature and humidity - characteristics. Ordinate means resistance ratio - of the sensor (Rs/Ro), Rs means resistance of sensor - in 100ppm CO under different tem. and humidity. - Ro means resistance of the sensor in environment of - 100ppm CO, 20℃/65%RH - -Structure and configuration - -Structure and configuration of MQ-7 gas sensor is shown as Fig. 3, sensor composed by micro AL2O3 ceramic tube, Tin -Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a crust made by plastic and stainless steel -net. The heater provides necessary work conditions for work of sensitive components. The enveloped MQ-7 have 6 pin, 4 -of them are used to fetch signals, and other 2 are used for providing heating current. - -Tel: 86-371-67169070/80 Fax: 86-371-67169090 Email: sales@hwsensor.com - Henan Hanwei Electronics Co., Ltd www.hwsensor.com - -Notification - -1 Following conditions must be prohibited -1.1 Exposed to organic silicon steam - - Organic silicon steam cause sensors invalid, sensors must be avoid exposing to silicon bond, -fixature, silicon latex, putty or plastic contain silicon environment - -1.2 High Corrosive gas - - If the sensors exposed to high concentration corrosive gas (such as H2Sz, SOX，Cl2，HCl etc), it will -not only result in corrosion of sensors structure, also it cause sincere sensitivity attenuation. - -1.3 Alkali, Alkali metals salt, halogen pollution - - The sensors performance will be changed badly if sensors be sprayed polluted by alkali metals salt -especially brine, or be exposed to halogen such as fluorin. - -1.4 Touch water - Sensitivity of the sensors will be reduced when spattered or dipped in water. - -1.5 Freezing - Do avoid icing on sensor’surface, otherwise sensor would lose sensitivity. - -1.6 Applied voltage higher - - Applied voltage on sensor should not be higher than stipulated value, otherwise it cause down-line or -heater damaged, and bring on sensors’ sensitivity characteristic changed badly. - -1.7 Voltage on wrong pins - For 6 pins sensor, if apply voltage on 1、3 pins or 4、6 pins, it - -will make lead broken, and without signal when apply on 2、4 pins - -2 Following conditions must be avoided -2.1 Water Condensation - - Indoor conditions, slight water condensation will effect sensors performance lightly. However, if water -condensation on sensors surface and keep a certain period, sensor’ sensitivity will be decreased. - -2.2 Used in high gas concentration - No matter the sensor is electrified or not, if long time placed in high gas concentration, if will affect - -sensors characteristic. - -2.3 Long time storage - The sensors resistance produce reversible drift if it’s stored for long time without electrify, this drift is - -related with storage conditions. Sensors should be stored in airproof without silicon gel bag with clean air. -For the sensors with long time storage but no electrify, they need long aging time for stbility before using. - -2.4 Long time exposed to adverse environment - No matter the sensors electrified or not, if exposed to adverse environment for long time, such as - -high humidity, high temperature, or high pollution etc, it will effect the sensors performance badly. - -2.5 Vibration - Continual vibration will result in sensors down-lead response then repture. In transportation or - -assembling line, pneumatic screwdriver/ultrasonic welding machine can lead this vibration. - -2.6 Concussion - If sensors meet strong concussion, it may lead its lead wire disconnected. - -2.7 Usage - For sensor, handmade welding is optimal way. If use wave crest welding should meet the following - -conditions: - 2.7.1 Soldering flux: Rosin soldering flux contains least chlorine - 2.7.2 Speed: 1-2 Meter/ Minute - 2.7.3 Warm-up temperature：100±20℃ - 2.7.4 Welding temperature：250±10℃ - - 2.7.5 1 time pass wave crest welding machine -If disobey the above using terms, sensors sensitivity will be reduced. - -Tel: 86-371-67169070/80 Fax: 86-371-67169090 Email: sales@hwsensor.com - diff --git a/Datasheets/MQ-8.pdf b/Datasheets/MQ8 - Sparkfun.pdf similarity index 100% rename from Datasheets/MQ-8.pdf rename to Datasheets/MQ8 - Sparkfun.pdf diff --git a/Datasheets/MQ9.pdf b/Datasheets/MQ9 - Hanwei.pdf similarity index 100% rename from Datasheets/MQ9.pdf rename to Datasheets/MQ9 - Hanwei.pdf