MQ-4 Methane,Propane and Butane sensor

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. This sensor has a high sensitivity and fast response time. The sensor's output is an analog resistance. The drive circuit is very simple; all you need to do is power the heater coil with 5V, add a load resistance, and connect the output to an ADC.

Technical Specification

• Sensor Type Semiconductor
• Power requirements: VCC - 5V±0.1
• DO output: TTL digital 0 and 1 (0.1 and 5V)
• AO output: 0.1-0 .3 V (relative to pollution), the maximum concentration of a voltage of about 4V
• Detection Gas: Natural gas/Methane
• Detection Concentration: 200-10000ppm (Natural gas / Methane)
• Interface: 1 TTL compatible input (HSW), 1 TTL compatible output (ALR)
• Heater consumption: less than 750mw
• Operating temperature: 14 to 122 °F (-10 to 50°C)
• RH Related humidity less than 95%Rh
• O2 Oxygen concentration is 21% (standard condition) - Oxygen concentration can affect sensitivity
• Load resistance: 20KΩ
• Sensing Resistance Rs: 10KΩ- 60KΩ (1000ppm CH4)
• Preheat time:20s
• Standard Encapsulation Bakelite, Metal cap