The Series CDTCarbon Dioxide and Temperature Transmittersaccurately monitor the CO2concentration and temperature in indoor environments to help achieve energy savings. For increased sensor accuracy, a single beam dual wavelength nondispersive infrared NDIR) sensor is used to automatically correct the measurement in both occupied* and unoccupied buildings against light source aging effects. The single beam dual wavelength sensor technology provides the highest level of accuracy compared to Automatic Baseline Correction methods which can unintentionally shift the calibration based on CO2levels and barometric pressure conditions. In order to achieve a higher level of accuracy, the Series CDT includes digital barometric pressure adjustment and the ability to field-calibrate the sensor.
For applications that require visual indication, the wall mount configurations of the Series CDT can be ordered with an integral LCD display. Push buttons are standard on all configurations of the transmitters for access to the menu structure, but wall mount configurations can be ordered without the buttons. To prevent tampering, the action of the buttons can be locked out using an internal dip switch selection.
• Single beam dual wavelength NDIR sensor eliminates draft due to light source aging
• Integral passive temperature outputs reduce number of devices mounted in the
• Service display tool available for models without an integral LED
• Optional integral display and relay output
• Demand control ventilation in schools, office buildings, hospitals, and other indoor
• LEED ® certification
Sensor:Single beam, dual wavelength NDIR.
Range:CO2: 0 to 2000 or 0 to 5000 ppm (depending on model); Temperature: 32 to 122°F (0 to 50°C).
Accuracy:CO2: ±40 ppm ±3% of reading; Temperature: ±10°C @ 25°C.
Temperature Dependence:±8 ppm/°C at 1100 ppm.
Pressure Dependence: 0.13% of reading per mm of Hg.
Response Time:2 min for 99% step change.
Duct Air Velocity Range: 0-4000 FPM (20.32 m/s).
Temperature Limits: 32 to 122°F (0 to 50°C).
Humidity Limits:10 to 95% RH (non-condensing).
Power Requirements: 16 to 35 VDC or 19 to 28 VAC.
Power Consumption:Average: 2 w; Peak: 3.75 w.
Output: Current: 4 to 20 mA (max. 500 Ω); Voltage: 0 to 5 VDC or 0 to 10 VDC (min. 500 Ω); Relay: SPST NO rated 2 A @ 30 VDC.
Weight: 4.4 oz (125 g).
Enclosure Rating:Duct mount: NEMA 4X (IP66) for housing only; Wall mount: IP20.
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