Air Quality Transmitters measure CO2, RH, and temperature.

Press Release Summary:

Combining CO2, RH, and temperature in one device, Series CDTR minimizes number of sensors mounted on wall or in duct. Transmitters use single-beam, dual-wavelength NDIR sensor to automatically correct measurement in both occupied and unoccupied buildings against light source aging effects. Universal outputs for both carbon dioxide and relative humidity allow users to select transmitter output to be 4–20 mA, 0–5 Vdc, or 0–10 Vdc to work with virtually any building management controller.

Original Press Release:

NEW! Series CDTR Carbon Dioxide, Humidity, & Temperature Transmitters

Dwyer Instruments, Inc., the preferred source for your complete range of practical and affordable instrumentation, is announcing the release of its NEW SERIES CDTR COMBINATION CO2, HUMIDITY, & TEMPERATURE TRANSMITTERS.

Series CDTR Carbon Dioxide, Relative Humidity and Temperature Transmitters reduce the number of sensors mounted on a wall or in a duct.  By combining CO2, RH, and temperature in one device, system integrators are able to lower installation time of mounting multiple housings, while lowering material cost at the same time.  Even with the three sensors combined into a single unit, replacement cost is not increased due to the pluggable nature of the humidity sensor, which allows it or the temperature to be replaced at a fraction of the cost of a new CO2 transmitter. 

Complete details are available on our website @

Dwyer Instruments, Inc.

P.O. Box 373

Michigan City, IN 46361

Phone: (800) 872-9141 or (219) 879-8000

Fax: (219) 872-9057

Internet address:


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