5 – Installation and set-up
MultiExact Gas Analyser
5.11.2 Latching/non-latching alarms
You can configure each of the two measurement alarms to be either latching or not
latching:
Select
➞
Set up.
Alarm setting
Meaning
Latching
Once the alarm condition has been activated, the alarm condition
remains activated (even if subsequent sample measurements would
not trigger the alarm) until the alarm is manually unlatched
Not latching
Once the alarm condition has been activated, the alarm condition
remains activated only until a subsequent sample measurement
which would not trigger the alarm is made. The alarm condition is
then deactivated
When necessary, use the following procedure to unlatch any 'latched' measurement
alarm(s):
1.
On the measurement screen, press the
soft key; the alarm option screen
(Figure 67) will then be displayed.
2.
With the 'Unlatch' option highlighted, press the
soft key. All latched
alarms will then be unlatched and the measurement screen will be displayed
again
5.11.3 Hysteresis levels
The hysteresis level associated with a measurement alarm determines when an alarm
condition (once activated) is deactivated, and this depends on the alarm mode, as
follows:
Select
➞
Set up.
Alarm mode
Effect of hysteresis
Low alarm
Once the low alarm condition has been activated, the alarm
condition will not be deactivated until a sample measurement is
above (alarm level + hysteresis level)
High alarm
Once the high alarm condition has been activated, the alarm
condition will not be deactivated until a sample measurement is
below (alarm level – hysteresis level)
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05410001A / Revision 6
