MT3896E Rev.1
15/10/2019
Pagina 24 di 45
3.2)
System states and operation
The LCD display provides the user with details about the various system states.
A few general rules apply at any level as follows:
•
Should there be a list displayed, the page scrolling can be done using the UP/DOWN
arrow keys. Once a selection is made by pressing the ENTER key the display will show
a more detailed view of that particular selection.
•
All the arrow keys, UP/DOWN, LEFT/RIGHT are being used also to move through the
parameter under change fields.
•
At any display level, the ESC key will switch back to the previous view. Pressing twice
the ESC key, you will go back to the main screen.
•
The same, at any display level, should no keys be pressed for more that 3 minutes, the
view will automatically switch back to the main window of the Normal mode.
3.2.1)
System states
The system is designed to be in one of the following operative states:
NORMAL
ALARM
FAULT
TEST/MAINTENANCE
UNSET
EMERGENCY
NORMAL
It is the normal system operative state without alarms and faults. The screen in this state
displays the channels (gas detectors) with measured gas concentration.
Fig. 3.2.1 a) Typical NORMAL state screen.
