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ALARMSUSER HANDBOOK
12.5 ALARM TYPES
12.5.1 Latching / Non Latching
Each alarm can be latching or non latching. Latching alarms must
be, and can only be cleared by the user when the gas level returns
to within the alarm limits.
Non-latching alarms clear automatically when the gas level returns
to within the preset alarm limits.
12.5.2 Muting / Acknowledging
Muting:
Muting of an alarm is achieved by a press and hold of the
LH button.
Muting means that the audible alarm will cancel for 60
seconds, after which if the gas concentration is still above
the set level (or below for Oxygen) the alarm will reactivate.
Acknowledging:
Only applicable to latching alarms. The audible/visual alarms
can only be cancelled after the atmosphere has returned to
safe concentrations.
The following Table 12.1 shows the GMI default selections. Latching
or non-latching options exist in all allowable alarms.
Alarms are allowed in Leak Test Mode and CSM Mode only.
Any single alarm e.g. LEL HI, Toxic Warning etc., can only have one
alarm concentration level and either latching/non latching and mute
or non mute and the output , i.e. LO Pitch / HI Pitch with LED’s
ashing/ramping are preset according to the following Table 12.1.
This means that if a CO HIHI Alarm is set at 35ppm and latching
and non-muting is selected for leak and/or CSM. The level will be the
same in each mode and the type, e.g. latching, will also be common.
If the alarm is disabled, it will not function in any mode.
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