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3.5
Buzzer – internal acoustic warning /alarm device
The control module contains an internal audible warning/alarm device (buzzer) designed to horn an audible
signal when intervention of the system operator is required, for instance when a gas hazard is detected or
when any part /component of the system reports an error.
The buzzer is activated under the following circumstances:
gas alarms – exceeding of the first, second or third alarm threshold is reported by any of gas
detectors connected to the control unit module,
defects /errors – a defect /error is reported by any of gas detectors connected to the control
module or failure of communication with detectors or a defect of the control module itself.
The activated buzzer produces a modulated audible signal with 0.5 s of sound and 0.5 s of silence.
The buzzer can be switched off (deactivated) for a specific period of time. If so, the buzzer shall horn no
sound, even in case when a triggering signal is active. However, after expiration of the deactivation time the
s. 25|40
User Manual: POD-003-ENG R04
Figure 13: Indications of LEDs on the front panel versus gas concentration measured by the detector
ALARM
2
1
MEAS.
Warning 2
Gas
concentration
Warning 1
ALARM
Overload
ALARM
2
1
MEAS.
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Description
N
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1
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1
W
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2
W
ar
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1
W
ar
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2
A
la
rm
Sensor lock –
sensor off, the last
measurement latched
The gas concentration is
falling, and with it
disappears warnings
W
a
rm
-
up
O
pe
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Gas
overload
Summary of Contents for PW-033-B
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