GJJ100W is an explosion-proof wireless methane sensor designed for underground coal mine use. It uses advanced TDLAS Technology to measure ambient methane level. The sensor has been mainly implemented in air ways of coal mining sectors.

• A laser measurement technology platform based on laser chips for the domestic coal industry.
• Expanded automatic temperature and pressure compensation for easy operation in high-altitude thermal environments.
• The sensor has a backup power supply with voltage and current limiting functions, and a low battery alarm function.
• Supporting intelligent wireless network architecture and level conversion.

• Measurement range: 0.00% -100%
• Measurement error: 0.00% -1.00%, ± 0.05%; 1.00% to 100%, ± 5% is the true value
• Working time: ≤ 15S
• Working voltage: (9-24) VDC
• Backup power supply:

1. ZIP working voltage: (12-16.8) VDC
2. Working time: at least 24 hours (maximum working current)
3. Battery type: Mine lithium-ion battery

• Wireless transmission settings:

1. Operating frequency: (430-436) MHz
2. Transmission power: ≤ 100mW
3. Receiving sensitivity: -80dbm
4. Transmission distance: ≤ 100m in open and accessible environments

• Low battery alarm: When the sensor battery level is below 20%, the local light alarm function is activated, and the information of low battery level is loaded;
• Explosion proof type: Intrinsic safety of mine (label: EXIA I MA)