Duct mount CO2 Switch 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. Typical Applications building automation for residental and commercial areas process control very simple installation compact size auto-calibration Technical Data Measuring Values CO2 Measurement principle Sensing element Measuring range Accuracy at 25°C (77°F) and 1013mbar Response time τ Temperature dependence Long term stability Sample rate Non-Dispersive Infrared Technology (NDIR) E+E Dual Source Infrared System 0...2000 / 5000 / 10000ppm 0...2000ppm: < ± (50ppm +2% of measuring value) 0...5000ppm: < ± (50ppm +3% of measuring value) 0...10000ppm: < ± (100ppm +5% of measuring value) < 195s typ. 2ppm CO2/°C typ. 20ppm / year approx. 15s Max. switching voltage Max. switching load Min. switching load Contact material Switch Output Supply voltage Current consumption Warm up time Housing / protection class Cable gland Electrical connection Electromagnetic compatibility 2) Working temperature and conditions Storage temperature and conditions 1) minimum flow speed 1m/s (200ft/min) 2) warm up time for performance according to specification

Dimensions (mm) Operation Principle Seal A...according to ordering guide Connection Diagram NO = normally open NC = normally closed WR = working range Order Example Ordering Guide MEASURING RANGE Measuring range: 0...5000ppm Model: CO2 Switch EE85 v1.8 / Modification rights reserved 151