Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 158)

IM 11M13A01-04E 12-4
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 12.4).
Pressing the alarm indication displays a description of the alarm. Alarms include those
shown in Table 12.2.
Displayed alternately
AL-06 21.0%
↔
F12.4E.EPS
Figure 12.4
Table 12.2 Types of Alarms and Reasons for Occurrence
T12.2E.EPS
Alarm Type of alarm Reason for occurrence
Oxygen concentration alarm
Alarm 1 concentration alarm Occurs when a measured value exceed or falls below
the set alarm value (refer to Section 8.3, "Alarm Setting").
Alarm 6 Zero-point calibration coefficient alarm Generated when the zero correction factor is
out of the range of 100 Ϯ 30% in 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 Ϯ 18% in 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 Occurs when an equipment internal temperature
exceeds 85
ЊC.
Alarm 11 Thermocouple voltage alarm Generated when thermocouple voltage exceeds 42.1 mV
(about 1020
ЊC ) or falls below -5 mV (about -170ЊC).
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.