diff --git a/Datasheets/MQ-135.pdf b/Datasheets/MQ-135.pdf new file mode 100644 index 0000000..37aadac --- /dev/null +++ b/Datasheets/MQ-135.pdf @@ -0,0 +1,155 @@ +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/MQ-5.pdf b/Datasheets/MQ-5.pdf new file mode 100644 index 0000000..028f80f --- /dev/null +++ b/Datasheets/MQ-5.pdf @@ -0,0 +1,159 @@ +HANWEI ELECTRONICS CO.,LTD MQ-5 http://www.hwsensor.com + +TECHNICAL DATA MQ-5 GAS SENSOR + +FEATURES + + * High sensitivity to LPG, natural gas , town 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 + +LPG, natural gas , town gas, 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 + 31±10% +PL Load resistance + less than 800mw +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 + Sensing Resistance 10KΩ- 60KΩ Detecting concentration + Rs scope： + (5000ppm methane ) 200-10000ppm + α LPG,LNG +(5000ppm/1000 Concentration slope rate ≤0.6 +ppm CH4) Natural gas, +Standard Temp: 20℃±2℃ Vc:5V±0.1 iso-butane, propane +detecting Humidity: 65%±5% Vh: 5V±0.1 Town gas +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 + + A向 A向 + +Structure and configuration of MQ-5 gas sensor is shown as Fig. 1 (Configuration A or B), sensor composed by + +TEL: 86-371- 67169070 67169080 FAX: 86-371-67169090 E-mail: sales@hwsensor.com + HANWEI ELECTRONICS CO.,LTD MQ-5 http://www.hwsensor.com + +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-5 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-5 + +10 MQ-5 + +Rs/Ro 1 Fig.3 is shows the typical + + sensitivity characteristics of + the MQ-5 for several gases. + + in their: Temp: 20℃、 + Humidity: 65%、 + + O2 concentration 21% + RL=20kΩ + + Ro: sensor resistance at 1000ppm of + H2 in the clean air. + + Rs:sensor resistance at various + concentrations of gases. + + H2 ppm + LPG + CH4 10000 + CO + alcohol + Air + +0.1 1000 + + 100 + + MQ-5 Fig.4 Fig.4 is shows the typical dependence of + the MQ-5 on temperature and humidity. +Rs/Ro 1.5 33%RH + 1.4 85%RH Ro: sensor resistance at 1000ppm of H2 in air at + 1.3 33%RH and 20 degree. + 1.2 Rs: sensor resistance at different temperatures + 1.1 and humidities. + + 1 + 0.9 + 0.8 + 0.7 + 0.6 + 0.5 + + -10 0 10 20 Temp 30 40 50 + +SENSITVITY ADJUSTMENT + Resistance value of MQ-5 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 H2 or LPG concentration in air and use value of Load resistance ( RL) about 20 KΩ(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- 67169070 67169080 FAX: 86-371-67169090 E-mail: sales@hwsensor.com + diff --git a/Datasheets/MQ-8.pdf b/Datasheets/MQ-8.pdf new file mode 100644 index 0000000..29892b0 --- /dev/null +++ b/Datasheets/MQ-8.pdf @@ -0,0 +1,150 @@ +HANWEI ELETRONICS CO.,LTD MQ-8 http://www.hwsensor.com + +TECHNICAL DATA MQ-8 GAS SENSOR + +FEATURES + + * High sensitivity to Hydrogen (H2) + * Small sensitivity to alcohol, LPG,cooking fumes + + * Stable and long life + +APPLICATION + +They are used in gas leakage detecting equipments in family and industry, are suitable for + +detecting of Hydrogen (H2), avoid the noise of alcohol and cooking fumes, LPG,CO. + +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 + 10KΩ Room Tem +PL Load resistance 31±5% + less than800mW +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 Ramark 2 + Rs Sensing Resistance 10KΩ- 60KΩ Detecting concentration + scope： + α (1000ppm H2) 100-10000ppm + (1000ppm/ +500ppmH2) ≤0.6 Hydrogen (H2) +Standard +detecting Concentration slope rate +condition + Temp: 20℃±2℃ Vc:5V±0.1 + Humidity: 65%±5% Vh: 5V±0.1 + +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-8 http://www.hwsensor.com + + Structure and configuration of MQ-8 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-8 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 + +100 MQ-8 + + 10 Fig.3 is shows the typical + sensitivity characteristics of + 1Rs/Ro H2 the MQ-8 for several gases. + LPG + 0.1 CH4 in their: Temp: 20℃、 + CO Humidity: 65%、 +0.01 alcohol O2 concentration 21% + 100 air RL=10kΩ + Ro: sensor resistance at 1000ppm + 1000 H2 in the clean air. + Rs:sensor resistance at various + concentrations of gases. + + ppm + 10000 + + Fig.2 sensitivity characteristics of the MQ-8 + + Rs/Ro 1.3 MQ-8 33%RH Fig.4 is shows the typical dependence of + 1.2 85%RH + 1.1 Fig.4 the MQ-8 on temperature and humidity. + + 1 Ro: sensor resistance at 1000ppm of H2 in air at + 33%RH and 20 degree. + 0.9 + 0.8 Rs: sensor resistance at 1000ppm of H2 in air + 0.7 at different temperatures and humidities. + 0.6 + 0.5 + 0.4 + + 0.3 + 0.2 + 0.1 + + 0 + + -10 0 10 20 Temp 30 40 50 + +SENSITVITY ADJUSTMENT + Resistance value of MQ-8 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 H2 concentration in air and use value of Load resistance ( RL) about 10 KΩ(5KΩ to 33 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/MQ2.pdf b/Datasheets/MQ2.pdf new file mode 100644 index 0000000..dfd1e02 --- /dev/null +++ b/Datasheets/MQ2.pdf @@ -0,0 +1,176 @@ + MQ-2 Semiconductor Sensor for Combustible Gas + + Sensitive material of MQ-2 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-2 gas sensor has high sensitity to LPG, Propane and Hydrogen, also could be used to Methane +and other combustible steam, it is with low cost and suitable for different application. + +Character Configuration + +*Good sensitivity to Combustible gas in wide range +* High sensitivity to LPG, Propane and Hydrogen +* 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 + + T + + Model No. MQ-2 Vc VRL + Sensor Type Semiconductor +Standard Encapsulation Bakelite (Black Bakelite) RL + Detection Gas Combustible gas and smoke VH + 300-10000ppm + Concentration ( Combustible gas) GND + + Loop Voltage Vc ≤24V DC The above is basic test circuit of the sensor. + 5.0V±0.2V ACorDC The sensor need to be put 2 voltage, +Circuit Heater Voltage VH heater voltage（VH）and test voltage（VC）. + Load Adjustable VH used to supply certified working + RL temperature to the sensor, while VC used + 31Ω±3Ω（Room Tem.） to detect voltage (VRL) on load resistance + Resistance （RL）whom is in series with sensor. The + ≤900mW sensor has light polarity, Vc need DC + Heater power. VC and VH could use same power + RH 2KΩ-20KΩ(in 2000ppm C3H8 ) circuit with precondition to assure + performance of sensor. In order to make + Resistance Rs(in air)/Rs(1000ppm the sensor with better performance, + suitable RL value is needed: + Heater isobutane)≥5 Power of Sensitivity body(Ps): + PH Ps=Vc2×Rs/(Rs+RL)2 + ≤0.6(R5000ppm/R3000ppm CH4) + consumption 20℃±2℃；65%±5%RH + Vc:5.0V±0.1V； +Character Sensing VH: 5.0V±0.1V + Rs Over 48 hours + + Resistance + + Sensitivity S + + Slope α + + Tem. Humidity + +Condition Standard test circuit + + Preheat time + Resistance of sensor(Rs): Rs=(Vc/VRL-1)×RL + + Sensitivity Characteristics Influence of Temperature/Humidity + Fig1 + 1.9 +Fig.1 shows the typical sensitivity characteristics of +the MQ-2, 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 85%RH +sensor in 1000ppm Hyrogen. All test are under standard +test conditions. Rs/R0 1.3 + +Structure and configuration 1.1 + + 0.9 + + 0.7 + + 0.5 10 20 30 40 50 ℃ + -20 -10 0 + + Fig.2 shows the typical temperature and humidity + characteristics. Ordinate means resistance ratio + of the sensor (Rs/Ro), Rs means resistance of sensor + in 1000ppm Butane under different tem. and humidity. + Ro means resistance of the sensor in environment of + 1000ppm Methane, 20℃/65%RH + +Structure and configuration of MQ-2 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-2 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/MQ3.pdf b/Datasheets/MQ3.pdf new file mode 100644 index 0000000..95c2c53 --- /dev/null +++ b/Datasheets/MQ3.pdf @@ -0,0 +1,165 @@ + 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/MQ4.pdf b/Datasheets/MQ4.pdf new file mode 100644 index 0000000..14ae6d1 --- /dev/null +++ b/Datasheets/MQ4.pdf @@ -0,0 +1,209 @@ +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/MQ6.pdf b/Datasheets/MQ6.pdf new file mode 100644 index 0000000..67a1028 --- /dev/null +++ b/Datasheets/MQ6.pdf @@ -0,0 +1,167 @@ + 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.pdf b/Datasheets/MQ7.pdf new file mode 100644 index 0000000..86e0039 --- /dev/null +++ b/Datasheets/MQ7.pdf @@ -0,0 +1,198 @@ +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/MQ9.pdf b/Datasheets/MQ9.pdf new file mode 100644 index 0000000..358ac9c --- /dev/null +++ b/Datasheets/MQ9.pdf @@ -0,0 +1,169 @@ +Henan Hanwei Electronics Co., Ltd www.hwsensor.com + + MQ-9 Semiconductor Sensor for CO/Combustible Gas + + Sensitive material of MQ-9 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 detects Methane, Propane etc combustible gas and cleans the other +gases adsorbed under low temperature. Please use simple electrocircuit, Convert change of conductivity +to correspond output signal of gas concentration. + + MQ-9 gas sensor has high sensitity to Carbon Monoxide, Methane and LPG. The sensor could be +used to detect different gases contains CO and combustible gases, it is with low cost and suitable for +different application. + +Character Configuration + +* Good sensitivity to CO/Combustible gas +* High sensitivity to Methane, Propane and CO +* Long life and low cost +* Simple drive circuit + +Application + +* Domestic gas leakage detector +* Industrial gas detector +* Portable gas detector +Technical Data + + Basic test loop + + Model No. MQ-9 V VR + Sensor Type Semiconductor +Standard Encapsulation RL + Detection Gas Bakelite VH + Concentration CO and combustible gas + GND + Loop Voltage Vc 10-1000ppm CO + 100-10000ppm combustible gas The above is basic test circuit of the +Circuit Heater Voltage VH sensor. The sensor need to be put 2 + ≤10V DC voltage, heater voltage（VH） and + Heater Time TL 5.0V±0.2V ACorDC（High） test voltage（VC）. VH used to + 1.5V±0.1V ACorDC（Low） supply certified working temperature + Load Resistance RL 60±1S（High）90±1S（Low） to the sensor, while VC used to + detect voltage (VRL) on load + Heater Resistance RH Adjustable resistance（RL）whom is in series + 31Ω±3Ω（Room Tem.） with sensor. The sensor has light + Heater PH polarity, Vc need DC power. VC and + consumption ≤350mW VH could use same power circuit + with precondition to assure +Character Sensing Rs 2KΩ-20KΩ(in 100ppm CO ) performance of sensor. In order to + Resistance make the sensor with better + Rs(in air)/Rs(100ppm CO)≥5 + Sensitivity S ≤0.6(R300ppm/R100ppm CO) + 20℃±2℃; 65%±5%RH + Slope α + Vc:5.0V±0.1V; + Tem. Humidity VH（High）: 5.0V±0.1V； + VH（Low）: 1.5V±0.1V +Condition Standard test circuit + Over 48 hours + Preheat time + + performance, suitable RL value is needed: Email: sales@hwsensor.com +Power of Sensitivity body(Ps): Ps=Vc2×Rs/(Rs+RL)2 +Tel: 86-371-67169070/80 Fax: 86-371-67169090 + Henan Hanwei Electronics Co., Ltd www.hwsensor.com + 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-9, 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 Propane under different tem. and humidity. + Ro means resistance of the sensor in environment of +resistance in different gases, Ro means resistance of 1000ppm Propane, 20℃/65%RH +sensor in 1000ppm LPG. All test are under standard +test conditions. + +Structure and configuration + +Structure and configuration of MQ-9 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 +