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<12. Troubleshooting>
12-5
12.2 Displays and Remedies When Alarms are
Generated
12.2.1 Alarm Types
When an alarm is generated, the alarm indication blinks in the display to notify of the alarm
(Figure 12.3). Pressing the alarm indication displays a description of the alarm.
Alarms include those shown in Table 12.2.
Tag:
21.0
%O
2
17.42mA -Output1
17.42mA -Output2
F12-3E.ai
Tag:
Alarm 6 :Zero conc.ratio
F12-4E.ai
Figure 12.3 Figure 12.4
Table 12.2 Types of Alarms and Reasons for Occurrence
Alarm No. Alarm Type Occurrence Conditions
Alarm 1 Oxygen concentration
alarm
Measured oxygen concentration value exceeds or falls below the
preset alarm limits. (refer to Section 8.3, Oxygen Concentration Alarms
Setting).
Alarm 6 Zero calibration coefficient
(correction ratio) alarm
In automatic or semi-automatic calibration, zero correction ratio
is outside the range of 100±30%. (refer to Subsection 9.1.3,
Compensation).
Alarm 7 Span calibration coefficient
(correction ratio) alarm
Span correction ratio is outside the range of 0±18% (refer to Subsection
9.1.3, Compensation).
Alarm 8 EMF stabilization time-up
alarm
In automatic or semi-automatic calibration, cell voltage does not stabilize
after the calibration time is up.
Alarm 10 Cold junction temperature
alarm
Temperature of the cold junction placed in the detector terminal box falls
below -25°C or exceeds 155°C.
Alarm 11 Thermocouple voltage
alarm
Generated when thermocouple voltage exceeds 42.1 mV (about
1020°C) or falls below -5 mV (about -170°C).
Alarm 13 Battery low alarm Internal battery needs replacement.
If an alarm is generated, actions such as turning off the heater power are not carried out. The
alarm is cancelled when the cause of the alarm is eliminated. However, Alarm 10 and/or Alarm
11 may be generated concurrently with Error 2 (heater temperature failure). In this case, the
operation when the error occurs has priority.
If the power to the converter is turned off after an alarm is generated and the converter is restarted
before the cause of the alarm has been eliminated, the alarm will be generated again. However,
Alarms 6, 7, and 8 (alarms related to calibration) are not generated unless calibration is executed.
IM 11M13A01-02E