Alarm Button; Alarm Schedule; Summary Of Alarms - Novatech 1635 User Manual

3.2

ALARM BUTTON

Repeatedly pressing the operators '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), displayed
alongside. New alarms will not have 'ACC' 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.
The alarm 'LED' will flash on 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 the horn relay which will re-initiate on
any new alarms.
3.3

ALARM SCHEDULE

3.3.1 SUMMARY OF ALARMS

1. 'Sensor 1 Hi Z'
Oxygen cell or electrode failure in the 1231 probe (high impedance); (inhibited under 650°C).
2. 'Sensor 2 Hi Z'
Oxygen cell or electrode failure in the 1234 RGS (high impedance); (inhibited under 650°C).
3. 'Heater 1 Fail'
The heater in the 1231 probe has failed to reach 650°C in 20 minutes.
In the first 20 minutes of power being applied to the heater after being switched on, this alarm will not occur, but a
'Probe Temperature' display will occur and one of the alarm relays may be activated if 'PROBE TEMP' was selected
in Section 4.5.55 to 57.
4. 'Heater 2 Fail'
The heater in the 1234 RGS has failed to reach 650°C in 20 minutes.
5. 'Probe 1 TC Open'
Probe thermocouple in the 1231 probe is open circuit. The heater in heated probes will switch off.
6. 'Probe 2 TC Open'
Sensor thermocouple in the 1234 RGS is open circuit. The heater in heated probes will switch off.
7. 'Dryer TC Open'
Dryer (Aux) thermocouple is open circuit. If the thermocouple is not needed, place a short circuit between terminals 5
& 6.
8. 'Ref Pump Fail'
The reference air pump in the analyser has failed.
9. 'Prbe 1 Filter'
The filters are blocked on the dryer / oven in-situ probe.
10. 'ADC Warning'
The analog to digital converter has been found to fall outside the normal calibration specifications. The analyser will
still be operating accurately because of the auto calibration system, but it is an abnormal condition.
11. 'ADC Cal Fail'
The analog to digital converter has been found to fall well outside the normal calibration specifications.
12. 'Mains Freq'
The sample of the mains frequency has failed.
13. 'DAC Warning'
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 2.21.
28
August 2009
1635 Water Vapour Analyser