5 Appendix
User’s Guide '(/7$23 37
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This detector function automatically compensates for
environmental influences, e.g. dust, pollution.
All 'LVFRYHU\ smoke detectors include compensation
for sensor drift as part of the internal signal-
processing algorithm. The algorithm will compensate
for changes in sensor output caused, for example by
dust in the chamber, and will therefor hold the
sensitivity at a constant level even with severe
chamber contamination.
Compensation values are stored in non-volatile memory and will be retained even
if detectors are disconnected.
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Each detector in the 'LVFRYHU\ 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 a higher sensitivity to fire than
Mode 5. The selection of the most suitable mode depends on the application.
Guidance on detector and mode selection is given in the selection grid below:
For ionisation and optical smoke detectors, the modes relate to different
combinations of smoke response threshold and response time. For the heat
detector, the mode relates to the fixed temperature setting and the sensitivity to
rate-of-rise of temperature. For the multisensor, the mode relates to the levels of
smoke and heat sensitivity and to the way in which the responses of the two
sensors are combined.
The response characteristics of the detectors have been carefully set so that
detectors will comply with the requirements of the relevant part of EN54 in all
response modes.
To program the system, please contact (OWHN¶V Service Department. For security
reasons, the configuration of the system should be regarded as access level 3 (in
terms of EN 54). Only authorised and qualified personnel should have access to
the set-up.
Time (months)
Analogue value
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