The air diffuses first through the filter on the front cover into the instrument enclosure and then through a second membrane filter into the CO2 sensing cell. As there is no flow through the sensing cell, this is very well protected against pollution.
The CO2 measurement is based on the Non-Dispersive Infrared (NDIR) technology. A patented auto-calibration procedure compensates for the aging of the infrared source and leads to outstanding long-term stability.
EE82 is available with measuring ranges of 0...2000, 0...5000 or 0...10000ppm. The switch threshold and hysteresis can be set with potentiometers on the printed circuit board.
The EE82 with snap-in mounting flange and M12 electrical connector allows for easiest
< ± (50ppm + 2% of measuring value)
< ± (50ppm + 3% of measuring value)
< ± (100ppm + 5% of measuring value)
0.7A at 50V AC
1A at 24V DC
24 V AC/DC
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.