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18. Probe 1 Filter Blocked
19. Probe 2 Filter Blocked
Alarm Trigger:
The alarm is caused by a blocked probe filter. This test is only performed when automatic
purging of the probe is selected. See chapter 11. This alarm will not reset until the next purge cycle. The
cycle can be initiated manually or automatically.
Response to Alarm:
Check the probe filter. If the purge system does not require an alarm this can be
disabled by linking across terminals 16 & 17 on the main board.
20. Gas 1 Calibration Error
21. Gas 2 Calibration Error
Alarm Trigger:
At the end of an automatic gas calibration check cycle the oxygen reading was outside the
values set in the Commissioning Menu #26 to 28 (#35 to 37). This alarm will not reset until the next
calibration check cycle. The cycle can be initiated manually or automatically.
Response to Alarm:
Check the gas calibration system for air leaks, certified gas concentration and flow
rates.
9.3 Selectable Process Alarms
The alarm relays 1, 2 and 3 are generally used to transmit a gas related alarm event. Any or all of the
following functions can be selected for each relay.
The trip levels and the delay times are set is in the Commissioning Menu.
NOTE: The process alarms will only be activated if they are enabled in the Setup Menu function #06. See
chapter 6.4.5 Process Alarms.
22. Oxygen 1 Very Low
23. Oxygen 2 Very Low
The measured oxygen level on the indicated probe has been below the trip level shown in Commissioning
Menu function #41 for longer than the delay time shown in function #42.
24. Oxygen 1 Low
25. Oxygen 2 Low
The measured oxygen level on the indicated probe has been below the trip level shown in Commissioning
Menu function #43 for longer than the delay time shown in function #44.
26. Oxygen 1 High
27. Oxygen 2 High
The measured oxygen level on the indicated probe has been above the trip level shown in Commissioning
Menu function #45 for longer than the delay time shown in function #46.
28. Oxygen Deviation
The difference between the oxygen level measured on probe #1 and the oxygen level measured on probe #2
is greater than the trip level shown in Commissioning Menu function #47 for longer than the delay time
shown in function #48.
29. Probe 1 Temperature Low
30. Probe 2 Temperature Low
The probe temperature is under 650C (1200°F). The probe cannot be used to calculate oxygen reading is
therefore invalid. If the probe heater has been on for more than 20 minutes and the temperature is less than
650C (1200°F) a 'Probe # Heater Fail' alarm will occur.
NOTE: The 'Probe # Temperature Low' relay function is used with unheated probes to indicate oxygen
reading is invalid (the probe is below 650°C / 1200°F), in case the process temperature falls below this level.
With heated probes this relay will be de-energised while the probe is heating up from ambient, making the
contacts open circuit.
31. Cal 1 in Progress
32. Cal 2 in Progress
A calibration check is occurring, triggered either in automatic mode or manually via the keypad.
August 2018
1732 Oxygen Transmitter
Technical Manual
53
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