Questions about our products?

EE85 is optimized for building automation as well as for process control applications. It measures CO2 concentration based on the Non-Dispersive Infrared (NDIR) technology.

A patented autocalibration procedure compensates for the aging of the infrared source and leads to outstanding long-term stability. The air from the duct flows through the probe into the EE85 enclosure and back into the duct. Inside the enclosure the air diffuses through a membrane into the CO2 sensing cell.

As there is no flow through the sensing cell, this is very well protected against dust. EE85 is available with measuring ranges of 0...2000, 0...5000 or 0...10000ppm and with two probe lengths.

The switch threshold and hysteresis can be set with potentiometers on the printed circuit board. The mounting flange included in the scope of supply facilitates installation in the ventilation ducts.

Technical data

  • 0...2000 ppm
    0...5000 ppm
    0...10000 ppm

    Measuring range
  • < ± (50ppm +2% of measuring value)
    < ± (50ppm +3% of measuring value)
    < ± (50ppm +5% of measuring value)

  • 0.7A at 50V AC
    1A at 24V DC

    Max. switching load
  • 24 V AC/DC


Product inquiry

Send us your e-mail, we will do our best to help you!


  • What is the difference between a 2 wire and a 3 wire current output?

    Transmitter with "two-wires" technology receive the power from the process, and the signal is carry on return wire (closed current loop). With technology "three-wires" the power supply is separate from current output: 2 wires are the power supply and third carry the signal.