Remedies When Alarms Are Generated - YOKOGAWA ZR22G User Manual

301 Battery low alarm
319 Fast warm-up function alarm
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 removed. However, Alarm 205 to 208 may be
generated concurrently with Alarm 017 (Fault: heater temperature error). In this case, the remedy
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 removed, the alarm will be generated again.
However, Alarms 120, 201 to 204 (alarms related to calibration) are not generated unless
calibration is executed.
12.2.2

Remedies When Alarms are Generated

(1) Alarm 101 to Alarm 116: Oxygen concentration alarm, Humidity alarm, Mixing ratio
alarm, Relative humidity alarm
This alarm is generated when the set alarm value is exceeded or falls below. For details on these
alarms, see Section "8.4
(2) Alarm 117: Simple cell resistance alarm
The result of the simple cell resistance measurement has exceeded setup alarm value. For a
resistance value of 2000 Ω or more, consider replacing the sensor. For a resistance value of
3000 Ω or more, sensor replacement is recommended. If the alarm must be cleared, change
setup alarm setting.
(3) Alarms 118 and 119: AO1 saturation, AO2 saturation
The analog output has reached the upper or lower limit. Check set value, and process-
measurements.
(4) Alarms 120: Calibration stability alarm
This alarm occurs when electromotive force of the sensor (cell) does not stabilize after calibration
period has elapsed because the sensor section of sensor is not filled with calibration gas (zero
gas, span gas).
<Cause of occurrence>
• Low flow rate of calibration gases (specified flow rate :600 ± 60 ml/min).
• The length or thickness of the calibration gas tubing has been changed (lengthened or
thickened).
• The measured gases flow toward the probe-tip of sensor.
• The response of the sensor (cell) deteriorated.
<Searching for the cause of the error and remedy>
(1) Calibration should be performed with calibration gases flowing at the specified flow rate
(600 ± 60 ml/min) after confirming that there are no leaks in the pipes.
(2) When calibration is performed normally, perform steady operation as it is.
If the alarm recurs, check the following before replacing the sensor assembly.
• The tip of sensor probe is markedly contaminated with dust, etc. If it is, clean it (see section
"11.1.2
the sensor assembly is replaced, it may be caused by the flow of the measured gases.
Make sure that the measured gases do not flow towards the probe tip of sensor, for example
by repositioning sensor.
Alarm Setting", in the chapter on operation.
Cleaning the Calibration Gas Tube"). If an alarm also occurs in calibration after
<12. Troubleshooting>
The internal battery is low.
Turning OFF Power Supply when the battery is exhausted
will reset the clock.
The function to shorten the warm-up time when an
instantaneous power failure occurs does not work.
IM 11M12G01-02EN
12-6
1sh Edition : Mar. 25, 2021-00