VSA-S
VAULT SOUND ALARM
SYSTEM
PAGE 3 OF 4
PRINTED IN USA
MKT. #8870002 - REV L
8/02
VSA SOUND ALARM FLUSH MOUNTED MICRO-
PHONES
FIG. 6 EXAMPLE
MODEL APC ACCUMULATION PULSE COUNTER
The Accumulation Pulse Counter, Model APC, is a plug-in option designed
for applications where extraneous sound levels penetrating the vault
environment may cause false alarms.
The function of the APC option is to allow the system to detect and
accumulate sound energy over a period of time and to cause an alarm
condition when sufficient energy has been detected. When used with the
APC, the purpose of the VSA is to detect a single noise of high energy
content. For this reason, the APC should be adjusted such that it is more
sensitive than VSA. An amber LED on the APC indicates when a noise
pulse has been counted.
The pulse counter control is adjustable from 1 to 9. This adjustment
determines the number of pulses required, during a 10 minute time frame,
to alarm the unit.
FIG. 5
Point A - Pulse level exceeds counter threshold and accumulates.
Point B - New 10 minute time frame starts. Previous pulses erased.
Point C - Pulse below counter threshold does NOT accumulate.
Point D - Pulse accumulates
Point E - Pulse does NOT accumulate
Point F and G - Pulses accumulate
Point H - 10 minute time frame ends with 3 pulses accumulated.
If pulse counter was set at 3 or below, the unit would have
alarmed. If pulse counter was set at 4 or above, no alarm would
have been received and the 3 accumulated pulses erased.
IF A SINGLE PULSE EXCEEDS THE ALARM THRESHOLD THE UNIT
WILL ALARM.
TYPICAL MICROPHONE
LAYOUTS
FIG. 4
FIG. 3
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