The CDTR-D series is a combined carbon dioxide (CO₂) and humidity transmitter for duct mounting. It measures CO₂ concentration, relative humidity, and optionally temperature within an air duct. The measured values can be transmitted via analog signals to a building management system to control ventilation accordingly. The CDTR-D series is available with CO₂ measuring ranges of 2000 and 5000 ppm. Optionally, the transmitter can be equipped with an alarm relay contact.
