C = corrected; E = intended expected; N = ignored nuisance alarm
; R = reminder, and n = no audible alarms recorded.
Some features found in analog/addressable smoke detectors to help eliminate the nuisance alarm
problem found with traditional, conventional-type smoke detectors include:
Under the old system, police dispatchers were spending so much time responding to false and nuisance alarms
that it was detracting from their police dispatch duties.
In selecting a sensor technology or a specific product, a security manager should look at performance with regard to several criteria including the probability of detection (PD), the false alarm rate (FAR), the nuisance alarm
rate (NAR), and vulnerability to defeat (VD).
. Prior to the upgrade, approximately 80 percent of the facility's perimeter had been ringed by an energy-field (E-field) system that sent a signal to the central alarm station when any mass disrupted the energy field.
A nuisance alarm
is any sensor response to unintentional stimuli.
When properly installed, both sensors provide a high probability of detection, however, the nuisance alarm
rate is higher than for the strain-sensitive cable sensor.
Poorly attached contacts, loose doors, and rattling windows are frequent causes of nuisance alarms
Over 70% of nurses strongly agree that nuisance alarms
directly disrupt patient care (Solet & Barach, 2012).
Honeywell's Xtralis Vesda-E VEP offers improved detection performance -- one and a half times greater sensitivity than Vesda VLP, up to six times better dust rejection to minimize nuisance alarms
, saving building owners significant potential costs from fire department calls.
The company claimed that the Xtralis VESDA-E VEP offers improved detection performance, with up to six times better dust rejection to minimise nuisance alarms
, thereby saving building owners significant potential costs from fire department calls.