① 4-20mA signal: standard 12-bit precision 4-20mA output chip, transmission distance 1Km

② RS485 signal: standard MODBUS RTU protocol, transmission distance 1Km

③ voltage signal: 0.4-2V,0-5V,0-10V output, optional (voltage output and current output two choose one)

④ Switching signal: standard 4 sets of passive contact relays, capacity 220VAC3AV/24VDC3A

Methane: 0-100% LEL (range can be customized)

Oxygen: 0-30% VOL (range can be customized)

Carbon monoxide: 0-1000PPM (range can be customized)

Hydrogen sulfide: 0-100PPM (range can be customized)

Methane: 0.1%LEL (more resolution customizable)

Oxygen: 0.01%VOL (more resolution customizable)

Carbon monoxide: 1PPM (more resolution can be customized)

Hydrogen sulfide: 0.1PPM (more resolution can be customized)

① Select three-core shielded cable for 4 ~ 20mA and four-core cable for RS485. When the distance exceeds 1000 m (with a detector), the single wire diameter shall be ≥ 1.5mm, and the shielding layer shall be connected to the ground.

② wireless transmission: can be built-in LORA, Zigbeg module, short-range wireless transmission; external GPRS/4G module, remote data transmission to the cloud platform, can be viewed on the computer side and mobile phone side of the history, not limited by distance (optional)

Normal temperature and high humidity pretreatment system, high temperature and normal humidity pretreatment system, high temperature and high humidity pretreatment system, high temperature and high humidity and high dust pretreatment system, pressure reducing valve, flow meter, chloroform gas measurement, 24VDC or 220AC sampling pump (sampling distance is 10 meters), vacuum pump (sampling distance is more than 40 meters), 24V switching power supply, 220V to 24V power adapter.

Computer monitoring accessories: free upper computer software, USB to RS485 conversion cable, RS485 to network port converter if network transmission is required.

Mounting bracket