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.
<Locating the failure, and countermeasures>
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.