Hochiki DRD-E - Manual (Page 9)

DRD-E Flame Detector Installation Manual Page 9 of 12
© 2010 Hochiki Europe (UK) Ltd
2-3-0-1376/ISS1/NOV10
3.2 Detector Window Contamination
It is important to keep the detector window clean and checks should be carried out at regular intervals –
determine locally according to the type and degree of contamination encountered – to ensure optimal
performance of the DRD-E flame detector. Although IR detectors can detect flames when the window is
contaminated, there may be a reduction of sensitivity.
3.2.1 Cleaning
If the window of the DRD-E flame detector is coated with dust or oil, the sensitivity to flames may decrease.
To remove the contamination, use a damp cloth; please ensure to remove any excess moisture with a dry
cloth.
NOTE: Do not wipe the main body of the detector window with alcohol or benzine.