Duct Mounted Co2 Electrical Transmitters

Duct mounted CO2 transmitters and switches of the EE85 series are designed for HVAC applications. The CO2 sensing element uses the Non-Dispersive Infrared Technology (NDIR). A patented auto-calibration procedure compensates for drift caused by the aging of the sensing element and guarantees outstanding long term stability.

Installed into a duct a small flow of air will be established by convection through the probe into the transmitter housing and back into the duct. Inside the transmitter housing the air will diffuse through a membrane into the CO2 sensing element. The operation in closed loop air stream avoids pollution of the CO2 sensor.

Measuring ranges of 0...2000ppm and 0...5000ppm correspond to an analogue interface of 0 - 5/10V or 4 - 20mA. Selectively a switching output with adjustable switching point and hysteresis is available. The instruments can be easily positioned in the duct with the standard mounting flange.