YOKOGAWA ZR402G User Manual

<12. Troubleshooting>
12-4
IM 11M12A01-04E 11th Edition : Jul. 19, 2017-00
12.2 Displays and Measures to Take When
Alarms are Generated
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.
Displayed alternately
AL-06
21.0%
F12.4E.ai
Figure 12.4
Table 12.2 Types of Alarms and Reasons for Occurrence
Alarm Type of alarm Reason for occurrence
Alarm 1
through 3
Oxygen concentration alarm
concentration alarm
humidity, and mixing ratio alarms
Occurs when a measured value exceed or falls below the
set alarm value (refer to Section 8.3, "Setting Alarms").
Alarm 6 Zero calibration coefcient alarm Generated when the zero correction ratio is out of the
range of 100 ± 30% in automatic and semi-automatic
calibration (refer to Section 9.1.4, Compensation).
Alarm 7 Span calibration coefcient alarm Generated when the span correction ratio is out of the
range of 0 ± 18% in automatic and semi-automatic
calibration (refer to Section 9.1.4, "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
semi-automatic calibration.
Alarm 10 Cold junction temperature alarm Occurs when an equipment internal temperature
exceeds 85°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.
12.2.2 Measures Taken When Alarms are Generated
l Alarm 1 through 3: Oxygen Concentration Alarm, Humidity, and Mixing Ratio
Alarms
This alarm is generated when a measured value exceeds an alarm set point or falls below it. For
details on the oxygen concentration alarm, see Section 8.3, “Setting Alarms,” in the chapter on
operation.

YOKOGAWA ZR402G Specifications

General

Brand	YOKOGAWA
Model	ZR402G
Category	Measuring Instruments
Language	English