4. OPERATION
4.1.1 LCD screen
The screen provides a graphical user interface that, during normal operation, displays gas reading
information. It also displays information about the system to the user, via a password protected
hierarchical system of menus, together with system fault and information messages.
Caution: Gas events occurring whilst in menus are not reported locally.
4.1.2 Control buttons
ThefourbuttonsonthefrontpanelbelowtheLCDscreenhavethefollowingfunctions:
(esc) is used to exit/cancel the current screen/option and return to the previous screen/option.
(up) is used to move upwards through the menu lists and to select (highlight) a required
menu option. It is also used to increment displayed values.
(down) is used to move downwards through the menu lists and to select (highlight) a required
menu option. It is also used to decrement displayed values.
(ok) is used to execute/acknowledge the chosen item.
The buttons are also used to enter the current password when required to access different menu
levels (see 4.3 and 4.4).
Note: If a user response using the buttons is not made to a required menu action, e.g. change/
accept a displayed setting value, then the system waits for approximately 10 minutes before
the process is aborted and the unit reverts to normal operation with the display showing the
normal Gas Reading screen.
If a value had been displayed and not changed within the timeout period the system reverts to
the status quo and uses the previously stored setting.
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