Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 189)

IM 11M13A01-02E 12-4
CAUTION
• Measure the thermocouple resistance value after the difference between the detector
tip temperature and the ambient temperature decreases to 50
؇C or less. If the thermo-
couple voltage is large, accurate measurement cannot be achieved.
12.1.2.3 Error-3: A/D Converter Failure/Error-4: Writing-to-memory Failure
• A/D Converter Failure
It is suspected that a failure has occurred in the A/D converter mounted in the electrical
circuits inside the converter.
• Writing-to memory Failure
It is suspected that a failure has occurred in an operation writing to the memory
(EEPROM) mounted in the electrical circuits inside the converter.
Turn off the power to the converter once and then restart the converter. If the
converter operates normally after restarting, an error might have occurred due to a
temporary drop in the voltage (falling below 85 V, the least amount of voltage required
to operate the converter) or a malfunction of the electrical circuits affected by noise.
Check whether or not there is a failure in the power supply system or whether the
converter and detector are securely grounded.
If the error occurs again after restarting, a failure in the electrical circuits is suspected.
Consult the service personnel at Yokogawa Electric Corporation.