Formula Sound SENTRY MK2 Panduan Pengguna - Halaman 5
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Remote reset options
Remote reset controls are available in either push button or keyswitch format, the reset control can
then be mounted as desired eg behind the bar or in the managers office.
Mic Tamper
With Int(ernal) mic(rophone) selected the internal microphone is monitored for tampering, if Ext(ernal)
mi(crophone) is selected the external microphone is monitored for tampering. A front panel LED
indicator will show MIC TAMPER if the microphone has been tampered with and the Sentry will trip
the contactor, the Sentry will not reset until MIC TAMPER indicator is off.
If Mic tamper is illuminated with Internal microphone selected the internal microphone is probably
damaged and you will need to contact your installer or Formula Sound.
The Sentry will switch off if the Mic tamper or Security loop indicators are illuminated.
Security loop
The security loop feature is provided on two terminals behind the removable cover plate, while the
two terminals are linked the Sentry will operate but if the link is broken (for more than half a second)
the Sentry will trip.
This feature can be used as in any circumstance that the Sentry is required to be tripped, eg fire
doors can be fitted with a magnetic relay so that if the fire doors open the relay breaks the circuit and
the Sentry is tripped.
A front panel LED indicator will show SECURITY LOOP if the link between the two terminals is
broken and the Sentry will trip the contactor, the Sentry will not reset until the link is restored (LED
indicator off).
Time levels exceed limit before the Sentry trips
The period of time that noise "over limit" is tolerated before the unit trips out is variable over the range
of 10 - 70 seconds. A pre-set is provided to adjust this should it be necessary - the factory setting is
approx. 20 seconds.
Fire alarm interface
The fire alarm interface option allows the Sentry to be interfaced to a fire alarm, the interface can be
set to accepted a trigger of voltage applied (up to 24V), voltage removed, contacts closing or contacts
opening. Factory setting is "voltage applied".
Isolated contacts
A pair of relay contacts that are normally open and close when the unit trips allow other equipment to
be switched if required (contacts can be normally closed if required).
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