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A
major objective in designing a detection system is to achieve the best
detection performance while keeping the number of unwanted alarms to a
minimum. Unwanted alarms are normally caused by environmental influences
and, generally speaking, the higher the sensitivity, the more frequent
the unwanted alarms.
Each detector in the
Discovery range can operate in one of five response modes, any of which
can be selected from the control panel. Each mode corresponds to a
unique response behaviour, which can be broadly related to sensitivity
to fire. Whatever the type of detector, mode 1 will give higher
sensitivity to fire than mode 5. Therefore, Discovery detectors set to
mode 1 will be most suitable for environments in which sources of
unwanted alarms are rare, for example cleanrooms and computer suites. At
the other extreme, response mode 5 will be suited to more dusty or smoky
enviroments such as loading areas where diesel forklift trucks are
operating. Response mode 3 is a general-purpose setting for which the
response is similar to that of the corresponding XP95 detector. The
table below illustrates typical applications and their modes.
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