Dwyer CDT-5D40 Carbon Dioxide Transmitter

Product Id : 268579


Dwyer CDT Series Carbon Dioxide and Temperature Transmitters measure the concentration and temperature of CO2 in schools, office buildings and other indoor environments to help achieve LEED ® certification. For improved sensor longevity, a single-beam dual-wavelength non-dispersive infrared (NDIR) sensor is used to automatically correct aging effects in both occupied and unoccupied buildings.

Applications: Demand control ventilation in schools, office buildings, hospitals, and other indoor environments

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Product Description

Dwyer CDT Series Carbon Dioxide and Temperature Transmitters measure the absorption of CO2 and temperature indoor areas to ensure energy savings. For greater sensor precision, a single beam dual-wavelength nondispersive infrared (NDIR) system is mostly used to automatically correct the measurement towards light source aging effects both in occupied * and unoccupied building structures. Similar to Automatic Baseline Correction methods, the single-beam dual-wavelength sensor technology offers the highest degree of precision and can accidentally change the calibration based on CO2 levels and barometric pressure.

Features of Dwyer CDT-5D40 Carbon Dioxide Transmitter :

  • Single beam dual-wavelength NDIR sensor eliminates draft due to light source aging
  • Optional integral display and relay output
  • Integral passive temperature outputs reduce the number of devices mounted in the space
  • Service display tool available for models without an integral LED


Additional Information

Weight 1 kg
Manufacturer Dwyer
Model No. CDT-5D40
Measuring Parameters CO2 and temperature
Range 0 to 2000 or 0 to 5000 ppm
Accuracy ±40 ppm ±3% of reading
Pressure Dependence 0.13% of reading per mm of Hg.
Range_1 32 to 122°F (0 to 50°C)
Accuracy_1 ±1°C @ 25°C
Temperature Dependence ±8 ppm/°C at 1100 ppm
Current Output 4 to 20 mA (max. 500 Ω
Voltage Output 0 to 5 VDC or 0 to 10 VDC (min. 500 Ω)
Relay Output SPST NO rated 2 A @ 30 VDC
Operating Temperature 32 to 122°F (0 to 50°C).
Operating Humidity 10 to 95% RH (non-condensing)
Enclosure Rating Duct mount: NEMA 4X (IP66) for housing only; Wall mount: IP20
Weight 4.4 oz (125 g).

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