5 – Installation and set-up
MultiExact Gas Analyser
5.11
Configuring the measurement alarms
5.11.1 Alarm modes and levels
Two separate measurement alarms are available for each sample gas measurement
for which the analyser is configured, and you can configure each alarm to operate in
one of three modes:
Alarm mode
Operation
None
The alarm is not used (that is, an alarm condition will not be
activated under any circumstances)
Low alarm
An alarm condition will be activated when a sample measurement
is lower than the preset alarm level *
High alarm
An alarm condition will be activated when a sample measurement
is higher than the preset alarm level *
* During a calibration, an alarm will only be activated if the alarm 'Follow' option is set to yes.
While a measurement alarm condition is activated:
•
An 'alarm' icon is shown on the measurement screen (see Section 4.2). The
number ("1" or "2") in the icon will identify the alarm which has been triggered.
•
The alarm LED on the front of the analyser (see Figure 1) flashes on and off.
•
If the alarm relays have been fitted the appropriate alarm relay will be triggered.
You can view the details of the activated alarm: see Section 5.11.4.
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Ensure that the measurement alarm and hysteresis levels are not too close to
the expected sample measurements. (If they are, minor – and acceptable –
variations in your sample gas concentrations will result in spurious alarms.)
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If you configure one measurement alarm as 'low' and configure the other
alarm as 'high', ensure that the 'high' alarm and hysteresis levels are higher
than the 'low' alarm and hysteresis levels. (If you do not, the analyser can be
permanently in an alarm condition, until you correct the levels.)
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