Electrobot MQ-3 Alcohol Gas Sensor Module Electronic Components Electronic Hobby Kit

STRUCTURE and CONFIGURATION: MQ-3 gas sensor is 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.///// Specifications: Circuit voltage: 5V±0.1 DC; Heating voltage: 5V±0.1 DC; Power requirements: 5 VDC @ ~165 mA (heater on) / ~60 mA (heater off); Using Temperature: -10?-50?(14 to 122 °F) Standard detecting condition; Temp: 20?±2?; Vc:5V±0.1; Humidity: 65%±5%; Vh: 5V±0.1; Preheat time: Over 24 hour; Sensing Resistance: 1M?-8M? (0.4mg/L alcohol); Dimensions: 32 x 22 x 16 mm.///// 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 K? (100K? to 470 K?).///// When accurately measuring, the proper alarm point for the gas detector should be determined after considering the temperature and humidity influence.