Sensor (CO2):Single-beam, dual-wavelength NDIR; Humidity: Capacitive polymer; Temperature: 10KΩ thermistor.Range:CO2: 0 to 2000 or 5000 PPM CO2 (depending on model); Humidity: 0 to 100% RH; Temperature: 32 to 122°F (0 to 50°C).Accuracy:CO2: ±40 ppm ±3% of reading; RH: ±2% (10 to 90% RH); Temperature: ±1°C @ 25°C.Temperature Dependence (CO2):±8 ppm / °C at 1100 ppm.Non-Linearity (CO2):16 ppm.Pressure Dependence (CO2):0.13% of reading per mm of Hg.Response Time (CO2):2 min. for 99% step change.Temperature Limits:32 to 122°F (0 to 50°C).Humidity Limits:10 to 95% RH (non-condensing).Power Requirements:10 to 42 VDC / 10 to 30 VAC.Power Consumption:Average: 0.5 watts; Peak: 1.2 watts.Output:2-wire RS-485, Modbus® RTU or BACnet MS/TP communication protocol.Weight:4.4 oz (125 g).Enclosure Rating:IP20.Agency Approvals:BTL, CE.