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14.1.4
Detector Fault – Upper Operating Temperature
During normal operation and during calibrations, the detector
temperature is compared against an upper limit.
If this limit is exceeded, then a fault message is displayed and
the fault icons displayed. The fault is also logged in the fault list.
14.1.6
Detector Fault – Sensor Presence Failure
The detector performs a periodic check on the gas sensor to
ensure that it is both present and operating within a healthy
state. If the check reveals that the sensor is not present (or
behaving as if it were not present), a fault message and icons
will be displayed. The fault is also logged in the fault list. This
fault is cleared by checking the condition of the sensor and
replacing if required.
14.2. Fault Log And Information Screens
14.2.1
Detector Fault Log
Every fault event that occurs within the detector is added to the
fault list. If a fault is still present, both the gas detector icon and
warning icon will be present on the main measurement screen.
If a fault has occurred and has cleared, then the gas detector
icon will be cleared with just the warning triangle icon visible.
The warning icon flags the user to enter the detector status
screen to check for events that occurred. The list updates once
the status screen is entered. Any faults present or past are
contained in the list. Only one entry for each fault type is
included. The list may be cleared by operating the 'cross' icon
at the top right of the screen. This will also clear any current
alarm states. If the fault condition still persists, the fault will re-
appear in the list after being cleared.
14.1.5
Detector Fault – Lower Operating Temperature
A similar check is made against a lower temperature limit. A
fault message and icons are displayed if the detector is operated
or calibrated beyond this limit.
14.1.7
Detector Fault – Low Sensor Sensitivity
Each time the detector is span calibrated, a check of the sensors
gain performance is made. If the sensor has reached a point
where unstable readings are possible, a fault message and icons
will be displayed. The fault is also logged in the fault list. The
actual sensor life remaining can be viewed on the detector
information screen. This fault is cleared by changing the sensor,
re-calibrating the detector and resetting the sensor life counter.
14.2.2
Detector Information Screen
The detector information screen contains the units serial
number, the date of manufacture, hardware and firmware
revisions and Gastech company information.
14.2.3
Resetting the Detector Life Counter
This screen also indicates the sensor life remaining. Once a
sensor has expired and been replaced, the life counter can be
reset by using the detector icon at the top right of the screen.
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