gas safety device 1)Unit:ppm, mA, %,%LEL,%VOL 2)Display:backlight LCD, ... Play! .* Sensor replacement without recalibration, automatic sensor data recognition. Sensor fault signal output monitoring and indicating.* Programmable alarm operation value, low ... ...45VDC (24VDC typical)Output: 4...22.8mA (linear), 3.6mA (fault signal) T90: <15sResolution: 1μA Accuracy: ±3%F.S., ±1 ...