... :ppm, mA, %,%LEL,%VOL 4)IP rating: Ip66 Programmable alarm operation value 4-20mA smart gas detectorTechnical features* 4-20mA, 2 wire connection ... Power supply: 24VDC (10.5 ~ 45 VDC)* Linear output signal: 4~22.8mA with superimposed communication signal for HART protocol * Failure ... display 0-100% full scale"* Unit: ppm, mA, %,%LEL,%VOL* Operating temperature:-40~70°C (According to gas sensor operating ...