MT4412E Rev.3 15/10/2019 Page 27 of 30
1. Short circuit, open circuit, or channel malfunction
2. Removal or malfunction of a ST.G/IN8 or ST.G/OUT16 module
3. Detector in Under-scale (signal below "0")
4. Detector in over-range (signal over 100% of the scale)
Fig. 3.2.1.d) Screen in Fault status
By pressing the Enter key with a fault event selected, a screen opens that shows the
event details:
Fig. 3.2.1.e) Fault event details
TEST/MAINTENANCE
This status is active when one or more channels are in TEST mode, and is used to
perform maintenance of the gas detection system. To put one or more channels in TEST
mode, the user must perform a specific procedure as described later in the manual.
The concentration of gas measured by a sensor in TEST mode will be displayed on the
display of the central unit, but will not generate an alarm status if it exceeds a set
threshold.
Similarly, a relay output in TEST mode will not be activated even in the event of an alarm
or fault.
UNSET
This status is used to exclude individual channels or system parts without physically
disconnecting sensors.
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