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MQ-5 Dataheets PDF



Part Number MQ-5
Manufacturers Winsen Electronics
Logo Winsen Electronics
Description Semiconductor Sensor
Datasheet MQ-5 DatasheetMQ-5 Datasheet (PDF)

Zhengzhou Winsen Electronics Technology Co., Ltd www.winsensor.com MQ-5 Semiconductor Sensor for Combustible Gas Sensitive material of MQ-5 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-5 gas sensor has high sensitity to Methane, Propane an.

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Zhengzhou Winsen Electronics Technology Co., Ltd www.winsensor.com MQ-5 Semiconductor Sensor for Combustible Gas Sensitive material of MQ-5 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-5 gas sensor has high sensitity to Methane, Propane and Butane, and could be used to detect both Methane and Propane. 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 Methane, Butane and Propane * 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. Sensor Type Standard Encapsulation Detection Gas Concentration Loop Voltage Vc Circuit Heater Voltage Load Resistance VH RL Heater Resistance RH Character Heater consumption Sensing Resistance PH Rs Sensitivity S Slope α Tem. Humidity Condition Standard test circuit Preheat time MQ-5 Semiconductor Bakelite (Black Bakelite) LPG, Methane, coal gas 300-10000ppm( Methane, Propane, Butane, H2) ≤24V DC 5.0V±0.2V AC or DC Adjustable 31Ω±3Ω Room Tem. ≤900mW 2KΩ-20KΩ(in 2000ppm C3H8 ) Rs(in air)/Rs(1000ppm C3H8)≥5 ≤0.6(R1000ppm/R500ppm H2) 20 ±2 65%±5%RH Vc:5.0V±0.1V VH: 5.0V±0.1V Over 48 hours Vc VRL RL VH GND The above is basic test circuit of the sensor. The sensor need to be put 2 voltage, heater voltage VH and test voltage VC . VH used to supply certified working temperature to the sensor, while VC used to detect voltage (VRL) on load resistance RL whom is in series with sensor. The sensor has light polarity, Vc need DC power. VC and VH could use same power circuit with precondition to assure performance of sensor. In order to make the sensor with better performance, suitable RL value is needed: Power of Sensitivity body(Ps): Tel: 86-371-67169097 Fax: 86-371-60932988 Email: [email protected] Zhengzhou Winsen Electronics Technology Co., Ltd Ps=Vc2×Rs/(Rs+RL)2 Resistance of sensor(Rs): Rs=(Vc/VRL-1)×RL www.winsensor.com Sensitivity Characteristics Influence of Temperature/Humidity Fig.1 shows the typical sensitivity characteristics of the MQ-5, ordinate means resistance ratio of the sensor (Rs/Ro), abscissa is concentration of gases. Rs means resistance in different gases, Ro means resistance of sensor in 1000ppm H2. All test are under standard test conditions. Structure and configuration 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 Propane under different tem. and humidity. Ro means resistance of the sensor in environment of 1000ppm Propane, 20 /65%RH Structure and configuration of MQ-5 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: 86-371-67169097 Fax: 86-371-60932988 Email: [email protected] Zhengzhou Winsen Electronics Technology Co., Ltd www.winsensor.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 sensor.


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