YOKOGAWA EXAxt ZR22G, User Manual, Page: 189 / 211

<12. Troubleshooting>
12-8
IM 11M12A01-02E 16th Edition : Mar. 19, 2020-00
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Alarm 8: EMF Stabilization Time-up Alarm
This alarm is generated if the sensor (cell) voltage has not stabilized even after the calibration
time is up for the reason that the calibration gas (zero gas or span gas) has not filled the sensor
assembly of the detector.
<Cause of alarm>
(1) The flow of the calibration gas is less than normal (a specified flow of 600 ± 60 ml/min).
(2) The length or thickness of the calibration gas tubing has been changed (lengthened or
thickened).
(3) The measuring gas flows toward the tip of the probe.
(4) The sensor (cell) response has deteriorated.
<Locating cause of failure, and countermeasures>
(1) Carry out calibration by passing the calibration gas at the specified flow (600 ± 60 ml/min)
after checking that there is no leakage in the tubing.
(2) If calibration is carried out normally, perform a steady operation without changing the
conditions. If the error occurs again, check whether or not the reason is applicable to the
following and then replace the sensor assembly.
• A lot of dust and the like may be sticking to the tip of the detector probe. If dust is found,clean
the probe (see Section 11.1.1).
In addition, if an error occurs in calibration even after the sensor assembly is replaced, the
influence of sample gas flow may be suspected. Do not let the sample gas flow toward the
tip of the detector probe, for example, by changing the mounting position of the detector.
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Alarm 9: Exhaust Gas Temperature Alarm
When “mA-input” is selected in the Exhaust gas setup display, this alarm occurs if the exhaust
gas temperature exceeds the set alarm values.
The following are probable causes:
(1) The temperature transmitter output range does not meet the analyzer Exhaust gas setup (if
this alarm occurs when the equipment starts up).
(2) Thermocouple(s) connected to the temperature transmitter may be defective
(disconnected).
(3) Temperature transmitter may be defective.
(4) Exhaust gas temperature may exceed the set alarm value.
<Locating cause of failure, and countermeasures>
(1) Check that the temperature transmitter output temperatures at 4 and 20 mA meet the
temperatures at 4 mA and 20 mA set with this equipment.
(2) Check that an actual exhaust gas is normal.
Press the detailed data display key to display and check that the exhaust gas temperature
in the displayed detailed data is normal. If this value is outside the temperature transmitter’s
normal output, the thermocouple(s) connected to the temperature transmitter may be damaged
(disconnected). See the applicable temperature transmitter instruction manual for solving
problems.
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Alarm 10: Cold Junction Temperature Alarm
This alarm is generated when the temperature of the cold junction located at the terminal block of
the detector falls below -25°C or exceeds 155°C. Check the following:
Display “C.J.temperature” in the Detailed-data display. If “C.J.temperature” is indicated as 200°C
or -50°C, the following can be considered.