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MAN0530 Issue 15 - 07/17
2104M0506
Fault/Problem
Diagnostics
report
Neg Gas
Reading
Diagnostics
report
Baseline Drift
Diagnostics
report
Bad
Temperature
Diagnostics
report
Supply Fault
Diagnostics
report
DSP Fault
Diagnostics
report
NV-RAM Fault
Diagnostics
report
RTC Fault
Diagnostics
report
Volt Ref Fault
5. PROBLEM SOLVING
Causes
Receiver misaligned
Contamination of windows
Negative drift of unit's zero
position
Receiver misaligned
Contamination of windows
Drift of unit's baseline
Unit has been operated
at a temperature outside
its specified and certified range
Incorrect supply voltage
reaching unit
Fault on the unit's digital
PCB
A fault has been detected in
the NV-RAM
The time and date record
being stored by the Real
Time Clock (RTC) has been
lost
Voltage reference fault
detected
Remedies
1) Re-align the Receiver, first using the
telescope and then using the Interrogator.
2) Re-zero the unit.
1) Check the Transmitter and Receiver
windows for build up of contamination.
Clean windows if required.
See Chapter 5.
2) Re-zero the unit.
Re-zero the unit.
1) Re-align the Receiver, first using the
telescope and then using the Interrogator.
2) Re-zero the unit.
1) Check the Transmitter and Receiver
windows for build up of contamination.
Clean windows if required.
2) Re-zero the unit.
Re-zero the unit
1) When Ex certified equipment is
operated outside its certified range, its
type approval certification is invalidated
along with its warranty.
Such equipment should be removed from
service in potentially explosive
atmospheres.
2) Investigate the cause of the excessive
temperature excursion and take steps to
prevent recurrence. (e.g. fit sunshade or
heat-shield, or relocate detector, etc.)
1) Check that the +24V supply voltage is
reaching the unit
(it should be between +18V and +32V).
2) Identify the cause of incorrect supply
voltage reaching the unit and rectify.
If this fault is displayed when the unit is
interrogated, it cannot be remedied
in the field.
If this fault is displayed when the unit is
interrogated, it cannot be remedied
in the field.
1) Re-enter the time and date using the
Interrogator.
2) Cycle the power applied to the unit.
3) Verify that the time and date record was
maintained after cycling the power.
If this fault is displayed when the unit is
interrogated, it cannot be remedied in the
field.
67
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