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hgis transformer maintenance ndir sensor Siemens

Room air quality sensors QPA20…dsp-control.com/cat/QPA.pdf· PDF fileWith maintenance-free CO 2 sensing element based on optical infrared absorp-tion measurement (NDIR1) ) ... Siemens Indoor air quality sensors QPA20… CE1N1961en Building Technologies 22.08.2008 ... The sensor must be powered by a transformer for safety extra low-voltage (SELV) with separate windings, suited for 100 % duty. ...

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