Analogue value
The raw reading an addressable detector returns to the panel (e.g. chamber obscuration), used to judge sensitivity, drift and contamination.
Trend values across service visits — a slowly rising value predicts a dirty-head callout.
Fire Engineering Glossary
Technical terms spanning standards, manufacturers, commissioning, networking, testing and fault finding.
Technical guidance only. Confirm current project requirements against the applicable standards, legislation, system documentation and site-specific fire strategy.
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Drift compensation
A detector function that gradually adjusts for chamber contamination to hold sensitivity stable, flagging a fault when the adjustment limit is reached.