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< 12. Troubleshooting >
12-11
IM 11M12D01-01E
(3) If the resistance value is within the above range, the cold junction temperature sensor seems
to be normal. Check whether or not the cable is broken or shorted out, and whether the cable is
securely connected to the terminals. Also, check that the resistance of the wiring between the
converter and detector is 10 Ω or less.
(4) If there is no failure in the wiring, the electrical circuits inside the converter may possibly fail.
Contact the service personnel at Yokogawa Electric Corporation.
The case where the Model ZO21D Detector is used:
(1) Without stopping the power to the converter, remove the wiring from terminals 5 and 6 of the
detector and measure the voltage between these terminals. If the voltage between the terminals
is out of the range of 0.4 to 0.7 V, the cold junction temperature sensor seems to be faulty.
Replace the cold junction temperature sensor.
(2) If the voltage between the terminals is within the above range, the cold junction temperature
sensor seems to be normal. Check whether or not the cable is broken or shorted out, and
whether the cable is securely connected to the terminals. Also, check that the resistance of the
wiring between the converter and detector is 10 Ω or less.
(3) If there is no failure in the wiring, the electrical circuits inside the converter may possibly fail.
Contact the service personnel at Yokogawa Electric Corporation.
CAUTION
The operating temperature range of the ZO21D detector is -10°C to 80°C (except for the high
temperature detector ZO21D-H). Since a cold junction temperature alarm for this analyzer is not
generated until the temperature exceeds 155°C, if the ZO21D is used, be careful in controlling the
ambient temperature of the terminal block.
6) Alarm 6: Process gas alarm
When process gas alarm is assigned to a contact input, the power to the detector heater is turned
off for safety during continuous input of the contact signal. The power to the heater will be turned on
again after the contact input is removed, and then warm-up will start. After the warm-up the averaging
converter will go in measurement mode automatically.
7) Alarm 7: Calibration gas pressure low alarm
When calibration gas pressure low is assigned to a contact input, calibration and indication check
are not performed during the input of the contact signal. If the averaging converter receives this
contact input during the calibration or indication check process, it will abort the ongoing calibration or
indication check, After the contact input is removed, subsequent calibrations and indication checks will
be enabled.
8) Alarm 8: Asymmetry alarm
NOTE
This function, alone, is not sufficient to ensure the accuracy and reliability of this instrument. Read the
following thoroughly, and use it as just one of several troubleshooting tools. Note that shipping-time
default is for this function to be disabled.
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