Aritech VV600, Планирование и руководство по установке

Страница: 9 / 32

Planning and Installation manual VV600/VV602Plus 7
3. F
UNCTIONAL DESCRIPTION
3.1. The VV600Plus standard seismic detector
The VV600Plus is a fully equipped seismic detector, compatible with almost any
commercially available security control panel, without the need of any additional
processing circuitry.
FUNCTIONAL DESCRIPTION OF THE VV600PLUS
3.1.1. Sensor element
The VV600Plus is sensing the structural vibrations caused by an attack against the
protected surface. A piezo-electric sensor converts the seismic signal into an
electric signal. This signal is then analysed in three independent signal processing
channels.
3.1.2. The integration channel
The integrating channel is designed to recognise low to medium amplitude signals
with long duration, like those caused by electric power tools or termic tools like a
burning bar or acetylene torch. The signal is first amplified in a preamplifier and
filtered in a band pass filter only allowing relevant frequencies to pass. After
processing, the signal is fed into an integrator which stores the incoming signals.
When a pre-set level is reached, the level detector triggers the alarm. The
sensitivity of this channel is set by adjusting the pre-amplification level.
3.1.3. The counting channel
The counting channel is designed to detect attacks with mechanical means like
hydraulic jack and hammer and chisel.
It avoids having to set the integrating channel to high sensitivity and long integrator
discharge times to cope with intermittent, short duration mechanical attacks. The
incoming signal is amplified and pulse formed for a pre-set time to avoid counting
multiple bounces. At the first incoming pulse, the counter counts 1 and starts the
timer. If a second pulse is detected within 180 seconds the counter counts 2 and
restarts the timer to look for a third pulse. If a second pulse is not detected within
180 seconds the counter will be reset. Five consecutive counts trigger the alarm.
The sensitivity of this channel is pre-set and is not affected by the sensitivity setting
of the integration channel.
Accelero
meter
Integrating
channel
Counting
channel
Explosion
channel
Signalconditioning
Alarm
output
Test
oscillator
Sabotage
protection
Power
supply
Sensitivity
Test
Spare
Internal VVT
Test
Sabotage
Sabotage
Spare
Alarmrelay
Alarmrelay
Testpoint
Alarm LED
-
+
9-15 VDC
3
5
4
6
7
8
9
10
11
2
1