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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).
5.7
Access to setting options – logging in procedure
Since the control module has several options of its operation and these options may substantially affect
operation of the entire Teta Gas system and, in consequence, safety of the protected facilities, access to
such crucial options is password protected. There two authorization levels:
level 0 – basic (unprotected) – enables viewing the indications and reading additional details
about the system,
level 2 – parametrization level (password protected) – enables adjustments of settings for
operation parameters of the system (the default password for the second level of authorization is
2000). Due to safety reasons the password must be changed prior to actual operation of the
system.
By default, the authorization level is 0. Each user that has physical access to the control module is on the
level 0 of authorization rights. Should a user want to select an option that requires a higher level of
authorization, the user is prompted for the password:
A password is a four-digit number. Due to safety reasons only one digit is visible. The digit can be adjusted
by means of
buttons whilst navigation from one digit to another is possible with
buttons.
The basic (unprotected) authorization level 0 is restored when:
user selects the
logout
option of the menu,
no button of the keypad is depressed during one minute.
s. 21|31
User's Manual: POD-051-ENG R02
Figure 10: Keeping the internal buzzer – time diagram
Button
Buzzer activation
ALARM 2
Gas
concentration
ALARM 1
Time
t
DEZ
Gas hazard – the
buzzer goes on
Gas hazard disappeared –
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
Enter password
(level 2):0***
