3.22
3.8.4 Sample Flow Alarm
This is only available if the optional sample flow alarm is fitted. It is parameter number 65. No
action on this alarm is possible via the keyboard. It is self clearing when the sample flow through
the cell returns to within its normal limits.
This alarm can be disabled by linking terminal 1 and 4 on TB-C on board 01100916A. See Figure
2.12 for location of this board.
3.8.5 Auto-Calibration Alarms
These alarms are:
Current output frozen - 45
Analyser in auto-calibration - 46
Zero gas flow failure - 63
Span gas flow failure - 64
Calibration gases out of tolerance - 66
These are described in Section 3.10.8.
3.8.6 Cell Temperature
These alarms are 92 for low cell temperature and 93 for high cell temperature. They are set at
57°C and 63°C respectively and cannot be changed by the user. The normal cell temperature is
60°C. These can be used as confirmation that the cell heaters are working correctly. They are
self cancelling when the cell temperature is within its normal limits.
The alarm levels are set to 107
o
C and 113°C for the high temperature analyser (1100H with 1132
Transducer). Normal cell temperature is 110°C.
3.8.7 Corrupt Memory
When the microprocessor performs a restart after an electrical power failure or break, it checks
certain locations in memory. If these are found to be corrupted it is an indication that the battery
back-up of the memory has failed. To prevent wrong constants being used the memory is erased
and the 'as supplied' values substituted. The analyser will need re-programming. This alarm,
number 67, shows that the memory has been erased.
This alarm is permanently allocated to relay 4 on the optional alarm relay board (not in software
versions 01100651, 01100652 and 01100699). When power is restored and the analyser returns
to normal operation this relay will be in the alarmed state. This can be used to alert the user to
the need to re-programme the analyser. Clearing of this alarm depends upon the software fitted
and type of microprocessor board.
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