Part Number : MQ-4
Function : Semiconductor Sensor for Flammable Gas
Manufactures : Henan Hanwei Electronics
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.
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 – Good sensitivity to Combustible gas in wide range – High sensitivity to Natural gas – Long life and low cost – Simple drive circuit Configuration 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-4 Semiconductor Bakelite (Black Bakelite) Natural gas.
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: 86-371-67169070/80 Fax: 86-371-67169090 […]