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9060-Zirconia Analyser
4.2
ALARM BUTTON
Repeatedly pressing the 'ALARM' button will produce alarm displays in sequence on the
lower line of the LCD display. If an alarm has cleared prior to pressing the 'ALARM'
button, it will not re-appear on a second run through the alarms. Active alarms which have
been previously displayed will have 'acc' (accepted in lower case), displayed alongside.
New alarms will not have 'ACC' (in upper case) displayed until a second press of the
'ALARM' button. After the last active alarm is indicated, the lower line of the display will
return to the last displayed lower line variable. Alarms may also be accepted remotely by
a temporary closure of a switch connected to terminal 16 & 17, 'REMOTE ALARM
RESET'.
The alarm 'LED' will flash when there is an un-accepted alarm. Pressing the 'ALARM'
button will cause the LED to go steady if any alarms are still active, or extinguish if there
are no active alarms. The horn relay will operate when an alarm occurs. Pressing
'ALARM' will mute a horn relay (if one of the user configurable relays have been selected
as a 'Horn' relay) which will re-initiate on any new alarms.
4.3 ALARM SCHEDULE
4.3.1 SUMMARY OF ALARMS - COMMON ALARM
1. 'Sensor 1 Fail'
2. 'Sensor 2 Fail'
Oxygen sensor or electrode failure (high impedance); (inhibited under 650°C (1200°F)).
3. 'Heater 1 Fail'
4. 'Heater 2 Fail'
In the first 20 minutes of power being applied to the heater after being switched on, this
alarm will not occur, but a 'Sensor 1(2) Lo Temp' display will occur and common alarm
relay will be activated. Refer to Section 6.11. If an ADC alarms occurs, the heaters will
automatically be turned off.
5. 'Sensor 1 TC Open'
6. 'Sensor 2 TC Open'
Probe thermocouple is open circuit. The heater in heated probes will switch off.
7. 'Aux TC Open'
Stack thermocouple is open circuit. If the thermocouple is not needed, select "NO T/C" for
"Aux TC Type" or place a short circuit between terminals 5 & 6.
8. 'Ref Pump Fail'
The reference air pump in the transmitter has failed.
9. 'Ref Air Fail'
The reference gas supply from the air pump in the transmitter to the probe is blocked, or
there is not sufficient airflow.
10. 'ADC Cal Fail'
The analog to digital converter has been found to fall outside the normal calibration
specifications. In this case the sensor heater will automatically be turned off.
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