CO2 room sensor, 24 preset selectable ranges, Measuring range CO2: 0-2,000 ppm, Humidity measuring range: 0-100 % r. F., Temperature measuring range: 0-50 ° C, NDIR sensor with auto-calibration through DualBeam process, Measuring principle: Capacitve, Power supply: 12 (20)-34 V AC/DC (relay), Output signal: 0-10 V, Load for analogue output: 10-100 kOhm, 3-wire, Housing material: ABS, Colour: Grey (RAL 9010), Housing dimensions: 87.5 x 87.5 x 30 mm, Protection rating: IP30, Connection: Screw terminals (max. 1.5 mm²)