Structure and configuration of MQ-4 gas sensor is composed of 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.
MQ-4 Gas Sensor Features:
• Good sensitivity to Combustible gas in wide range.
• High sensitivity to CH4, Natural gas.
• Small sensitivity to alcohol, smoke.
• Fast response Stable and long life.
• Simple drive circuit.