Security & Fire Protection Systems/smoke detector in pump station wet well


Have found current smoke detectors are not rated for than 95% H. We have started to have false alarms due to high moisture. Is there a compensated detector on the market for high humidity and classified for hazardous location

No smoke detector should be used in this kind of environment, unless you go with a beam type detector.  Any areas involving high humidity strikes me as better suited for heat type detectors.  You have a number of options.  You can go with a rate-of-rise/fixed temperature unit that is environmentally sealed (like those manufactured by Fire Detection Devices), or go with linear heat detector cable that's manufactured by Protecto-wire.

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Frank Kurz


Questions relating to Burglar Alarm and Security Equipment, Fire Alarm and Extinguishment Systems, Access Control, CCTV Systems, Installation, Service, Testing, Verification


30 years installing, servicing, and testing security, access control, extinguishment, and fire alarm systems

Chair of ULC Working Groups for Fire Alarm Testing (CAN/ULC-S536) and Fire Alarm Verification (CAN/ULC-S537), Executive Director of the Fire Protection Technicians Network (

Publications, Better Business Bureau Magazine, Applied Science Technologists and Technicians of British Columbia ( SUPPRESS! and Techs Fire Break Newsletters

Associate in Science; Emergency Systems (University of British Columbia); Aircraft Maintenance Technology (BCIT)

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