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14.2.4
Calibration Fault
If the detector has been re-configured to a different type via the
system menu, the calibration state of the instrument is returned
to the default condition as new – i.e. not calibrated.
The instrument requires a zero and full scale calibration
following a sensor type change. To indicate that a calibration is
required, the display indicates the warning message
'CALIBRATION FAULT'. This message automatically clears once
the calibrations are completed.
15.
Alarm Indication
15.1.1
Warn Alarm Indication
If the measured gas concentration reaches the set-point
programmed into the detector for a warn condition, the
detector will signal this via a message in the lower status bar.
Additionally a static alarm bell icon will be displayed.
If the detector has relays fitted, the warn relay will activate.
The behaviour of the alarm bell icon will depend on whether
latching or non-latching alarms have been configured.
15.1.3
Latched Alarm Indication
If the condition that triggered an alarm response has subsided
and the detector's alarms have been set to 'latched', the bell
icon will be indicated in inverse colour.
If the alarm condition was at warn level, the bell icon will be
static. If the alarm condition was at danger level, the bell icon
will be flash.
14.2.5
Internal Parameter Storage Fault
During the detector's start up sequence, critical calibration and
configuration data that is stored in the instruments non-volatile
memory is checked for consistency.
The same checks are made when any calibration of
configuration parameters are changed b the user.
If the stored data has become corrupted the display will indicate
a warning message to show that either the calibration or
configuration system data is not healthy.
To clear this warning, try recalibrating or reconfiguring the
detector. If these steps do not clear the fault, please call
Gastech for advice.
15.1.2
Danger Alarm Indication
If the measured gas concentration reaches the set-point
programmed into the detector for a danger condition, the
detector will signal this via a prominent message in the lower
status bar. Additionally a flashing alarm bell icon will be
displayed. If the detector has relays fitted, the danger relay will
activate. The behaviour of the alarm bell icon will depend on
whether latching or non-latching alarms have been configured.
15.1.4
Resetting From Alarm State
If the detector alarms are set to non-latching, the alarm state
will automatically clear once measured gas concentration has
dropped below the set-point (including any set hysteresis value).
If alarms are set to latched mode, they must be manually
cleared once it has been determined that it is safe to do so. To
reset the alarms, unlock the system menu and use the
soft-key to navigate to the detector status screen.
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