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 configureable 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. ‘Oxygen Sensor Fail’
Oxygen cell or electrode failure (high impedance); (inhibited under 650°C (1200°F) ).
2. ‘Heater 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 Low Temp’ display will occur and common alarm relay will be activated. Refer to Section 6.10. If an ADC
alarms occurs, the heater(s) will automatically be turned off.
3. ‘Sensor TC Open’
The oxygen sensor thermocouple is open circuit. The heater will switch off.
4. ‘Ref Pump Fail’
The reference air pump in the Analyzer has failed.
5. ‘ADC Cal Fail’
The analog to digital converter has been found to fall outside the normal calibration specifications. In this case the
oxygen sensor heater will automatically be turned off.
6. ‘Mains Freq’
The sample of the mains frequency has failed.
7. ‘DAC Cal Fail’
The digital to analog and voltage isolator circuit has been found to fall outside the normal calibration specifications.
This check is only performed when the ‘AUTO CAL’ button is pressed. Refer to Section 2.8.
8. ‘Gas Cal Err’
Oxygen sensor does not correctly calibrate to calibration check gas.
9. ‘BB RAM Fail”
The battery backed memory module has failed in service. The device normally lasts 10 years. It is the plug-in battery
like module on the 1630 -1 board, labelled M1.
10. ‘CO
2
Gen Fail’
The carbon dioxide module has had a general electronic failure. See set-up 12.
The carbon dioxide module has failed to communicate with the 9070. See set-up 12.
11. ‘CO
2
Cal Fail’
The carbon dioxide module has failed to do a complete a calibration. The carbon dioxide module may have measured
the calibration gas at well off the expected level. Re-try the calibration. See set-up 12.
12. ‘CO
2
High Temp’
The temperature of the carbon dioxide module is too high. Move the 9070 to a cooler operating area. The ambient
operating temperature is 5 to 45°C (40 to 110°F).
13. ‘CO
2
Gas Drift’
Teledyne Analytical Instruments 9070 Oxygen Analyzer Page 25
