Gas – Methane CNG Gas Sensor MQ-4

This is a simple-to-use compressed natural gas (CNG)sensor, suitable for sensing  natural gas (composed of mostly Methane [CH4]) concentrations in the air. The MQ-4 can detect natural gas concentrations anywhere from 200 to 10000ppm.

Easy to mix with MQ-6, so be careful. The name is in very thin letters on the metal band on the side.

Datasheet
Wiring Example