Description The FDP series rate-of-rise detectors operate on the pneumatic principle. i.e. the expansion of heated air in the air chamber, and respond to rapid rise in temperature caused by fire. A slow or gradual temperature rise as would result from a heating system in the building does not activate the detector because any moderate excess air is released into the atmosphere through the air vent. By the use of a common base, the FDP series rate-of-rise detectors are interchangeable with NOHMI smoke detectors (FDS series and FDK series). The detector is equipped with a response indicator by which it is possible to readily identify the alarming detector. This feature facilitates the functional check of the detector.
Alarm response lamp (LED)
Approved by Japan Fire Equipment Inspection Institute