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.
0...2000 ppmMeasuring range
< ± (50ppm +2% of measuring value)Accuracy
< ± (50ppm +3% of measuring value)
< ± (50ppm +5% of measuring value)
0.7A at 50V ACMax. switching load
1A at 24V DC
24 V AC/DCSupply
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EE85 Datasheet(787.8 kb)
Relabeling in case of product configuration change(1339.66 kb)
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.