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buzzer is restarted (reactivated). In addition, any new gas alarm
or a system defect /error that are reported
during the time when the buzzer is off are capable of the buzzer reactivation. Upon disappearing of the
triggering signal the buzzer goes off.
The buzzer can be deactivated by means of the keypad (see section 3.1.5), DI input (see section 2.2) and
External DI input (see section 2.4). The functionality of temporary deactivation is handled in a different way
for gas alarms and for defect. The possible duration of the buzzer deactivation time are:
for gas alarms: from 1 to 90 minutes,
for defects /errors: from 1 to 168 hours (1 week) or permanent deactivation (the buzzer shall
never be reactivated).
The foregoing parameters can be adjusted by an operator from the controller menu (see Section 3.8.5).
The illustration below presents waveforms for the internal audible signal (under the assumption that the
horn is triggered by a gas alarm and the buzzer is deactivated by means of a keypad button):
The buzzer can be also configured in such a way that is shall remain silent all the time.
3.6
Access rights to the menu options – login/logout procedures
Since the control unit module has some menu options that may substantially affect operation parameters of
the entire Sigma Gas system and, in consequence, to the safety level, access to such options is restricted.
Therefore three levels of authorization rights are implemented:
level 0 (basic) – enables all users to view indications and read additional information about the
system,
12 A new gas alarm is understood as exceeding of the next (higher) alarm threshold on the same detector or appearing of any threshold exceeding
on another detector
s. 26|40
User Manual: POD-003-ENG R04
Figure 14: Behaviour of the internal buzzer – signal waveforms
Button
Buzzer status
Warning 2
Gas
concentration
Warning 1
time
t
DEZ
Gas hazard – the
buzzer goes on
Gas hazard disappeard
– the buzzer goes off
Operator depressed the
button for temporary
deactivation (muting)
New alarm, the buzzer is
tripped again
Operator depressed the
button for temporary
deactivation (muting)
Deactivation (muting) time
– adjustable parameter
The deactivation
(muting) time expired,
the buzzer sound is
restored
Summary of Contents for PW-033-B
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