... maintenance. 3) Multi-parameter backlight LCD display: measuring range,digital gas reading ,units, bar graph , system status etc. ... from the control units. 10) Automatic temperature compensation ensure the correct measurement. gas detector Thchnical data:1) Power supply: 24VDC ... 2% resolution10) Unit: ppm, mA, %,%LEL%VOL11) Operating temperature: -40~70C (According to gas sensor operating conditions)12) ...