... ppm, mA, %,%LEL,%VOL 4)IP rating: Ip66 Programmable alarm operation value 4-20mA smart gas detectorTechnical features* 4-20mA, 2 wire connection ... digital gas reading ,units, bar graph , system status etc.* International standard plug-in sensor, Plug and Play! .* Sensor replacement ... 0-100% full scale"* Unit: ppm, mA, %,%LEL,%VOL* Operating temperature:-40~70°C (According to gas sensor operating ...