MT4299E Rev.1
15/10/2019
Pagina 53 di 55
4.8.4)
Detectors (Channels)
In the modules screen, moving up and down with the arrow keys through the modules
list and pressing ENTER one gets into the detectors screen
Fig. 4.8 4 a) Detectors screen and options available pressing 3-Channel
Using the up/down arrow keys one may scroll through the list choosing one of the
channel and press 3-Channel for the
SET / UNSET
and
TEST / EXIT TEST
operations.
In the “Operator” level, the options 3-CHANNEL, is not present. The user should be in
“Maintenance” or “Engineer” level to see and to use these options.
By the options of this screen, unlike the Operator level, the “Maintenance” level and the
“Engineer” level may:
- Put in Set or Unset the selected channel
- Put in Test/Maintenance and take out of Test/Maintenance the selected
channel
SET / UNSET
Pressing 3-Channel in the Maintenance or the Engineer level it is possible to Set or
Unset parts of the system.
An user with the MAINTENANCE level cannot UNSET more than 50% of the system’s
channels and relays.
The only exception is the ENGINEER level, which may UNSET the whole system if
necessary. It is required to do so for maintenance operations in the installation where
the gas detection systems is installed.
TEST / EXIT TEST
This will put to TEST mode or take out of the TEST (EXIT TEST) mode the selected
channel. It is possible to put in TEST mode just parts of the system when user level is
“Maintenance” or “Engineer”. If more than half of the system is selected, a warning
screen will pop-up.
As far as the number of channels to put in Test/Maintenance mode does not exceed the
defined limits, the selected items will change the status into TEST, as in the screen
below:
