Multifunctional CO2 transmitters for building automation systems that use Modbus serial communication protocol
CDT series air quality transmitters are engineered for building automation systems in the HVAC/R industry.
The CDT series measures carbon dioxide (CO2) utilizing the industry standard NDIR measurement principle,
and temperature (T). Optional relative humidity (rH) measurement is also available in the same device.
CDT series devices include:
• Modbus communication for each measurement parameter (CO2, rH, T)
• One analog output for selected measurement: voltage (0/2–10 V) or current (4–20 mA)
• 2″ x 3″ touchscreen display
• Optional relay output
Communication: RS-485 Modbus (RTU)
Accuracy :CO2: ±40 ppm + 2 % of reading, DC model: 75 ppm or 10 % of reading (whichever is greater)
Measurement elements:Pt1000 temperature sensor, Non Dispersive Infrared (NDIR) CO2 sensor,
thermoset polymer capacitive sensing element for humidity
Measuring units: ppm, °C, % rH
Calibration: Automatic self-calibration
Optional relay output: Potential free SPDT 250 VAC, 6 A / 30 VDC, 6 A with adjustable switching point and hysteresis