Datasheet MQ-2 (Winsen) - 4

Zhengzhou Winsen Electronics Technology Co., Ltd www.winsen-sensor.com
Basic Circuit Fig2. MQ-2 Test Circuit
Instructions: The above fig is the basic test circuit of MQ-2. The sensor requires two voltage inputs: heater voltage(VH) and circuit voltage(VC). VH is used to supply standard working temperature to the sensor and it can adopt DC or AC power, while VRL is the voltage of load resistance RL which is in series with sensor. Vc supplies the detect voltage to load resistance RL and it should adopt DC power. Calculation formula: Resistance of Sensitive materials (Rs)=(Vc/VRL-1)×RL Power consumption of Sensitive materials (Ps)=Vc2×Rs/(Rs+RL)2
Description of Sensor Characters C3H8 Air CH4 Alcohol Smoke Concentration Fig3.Typical Sensitivity Curve Fig4.Typical temperature/humidity characteristics
The ordinate is resistance ratio of the sensor (Rs/R0), the The ordinate is resistance ratio of the sensor (Rs/Rso).Rs abscissa is concentration of gases. Rs means resistance in target means resistance of sensor in 2000ppm propane(C gas with different concentration, R 3H8) under 0 means resistance of sensor different tem. and humidity. Rso means resistance of the in clean air. Al tests are finished under standard test conditions. sensor in 2000ppm propane under 20℃/55%RH. Tel: 86-371-67169097/67169670 Fax: 86-371-60932988 Email: sales@winsensor.com
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Document Outline Flammable Gas Sensor Instructions: The above fig is the basic test circ Resistance of Sensitive materials (Rs)=(Vc/VRL-1)× Power consumption of Sensitive materials (Ps)=Vc2×