Dwyer Instruments' Series CDT Carbon Dioxide and Temperature Transmitters feature a non-dispersive infrared sensor

Dwyer Instruments' Series CDT Carbon Dioxide and Temperature Transmitters monitor CO2 concentration and temperature. A single-beam dual-wavelength non-dispersive infrared (NDIR) sensor is used to automatically correct the measurement in both occupied and unoccupied buildings against aging effects. The Series CDT includes digital barometric pressure adjustment and the ability to field-calibrate the sensor.

Universal outputs allow users to select the transmitter output to be 4 to 20 mA, 0 to 5 VDC or 0 to 10 VDC. An optional relay with user-adjustable set points can be used to control exhaust fans, open actuated windows or dampers, or signal a light or horn.

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