Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 190)

IM 11M13A01-02E 12-5
12. Troubleshooting
12.2 Displays and Measures to Take When Alarms are Gen-
erated
12.2.1 What is an Alarm?
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
%O2
17.42mA -Output1
17.42mA -Output2
F12.3E.EPS
Tag:
Alarm 6 :Zero conc.ratio
F12.4E.EPS
Figure 12.3 Figure 12.4
Table 12.2 Types of Alarms and Reasons for Occurrence
T12.2E.EPS
Alarm Type of alarm Reason for occurrence
Alarm 1 Oxygen concentration alarm Generated when oxygen concentration to be
measured exceeds or falls below the set alarm
points (refer to Section 8.3, "Setting Oxygen
Concentration Alarms").
Alarm 6 Zero-point calibration coefficient alarm Generated when the zero correction factor is
out of the range of 100 ؎ 30% in automatic and
semiautomatic calibration (refer to Section 9.1.3,
"Compensation").
Alarm 7 Span-point calibration coefficient alarm Generated when the span correction factor is out
of the range of 0 ؎ 18% in automatic and semiautomatic
calibration (refer to Section 9.1.3, "Compensation").
Alarm 8 EMF stabilization time-up Generated when the cell (sensor) voltage is not
stabilized even after the calibration time is up in
automatic and semiautomatic calibration.
Alarm 10 Cold junction temperature alarm Generated when temperature of the cold junction
placed in the detector terminal box exceeds 155
؇C
or falls below -25 ؇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, such measures as turning off the heater power are not carried
out. The alarm is released when the cause for the alarm is eliminated. However, Alarm
10 and/or Alarm 11 may be generated at the same time as Error-2 (heater temperature
error). In such a case, the measure taken for this error has priority.
If the converter power is turned off after an alarm is generated and 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.