Robomart MQ-4 Natural Gas sensor

High sensitivity to Methane(CH4), Natural Gas.* Fast response and High sensitivity* Stable and long life.* Simple drive circuit. APPLICATIONThey are suitable for natural gas checker, Methane (CH4).MQ - 4 gas 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 has 6 pin, 4 of them are used to fetch signals, and other 2 are used for providing heating current. This MQ4 Gas sensor is suitable for detecting Natural Gas concentration on your breath, just like your common breathalyzer. It has a high sensitivity and fast response time. Sensor provides an analog resistive output based on Natural Gas concentration. The drive circuit is very simple; all it needs is one resistor. A simple interface could be a 0 - 3.3 V ADC.Resistance value of MQ - 4 is difference to various kinds and various concentration gases. So, when using these components, sensitivity adjustment is very necessary. we recommend that you calibrate the detector for 0.4mg / L (approximately 200 ppm) of Natural Gas concentration in air and use value of Load resistance that (RL) about 200 K? (100 K? to 470 K?).