Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 174)

<12. Troubleshooting>
12-4
IM 11M12A01-02E
NOTE
• Measure the thermocouple resistance value after the temperature difference between
the detector tip and the ambient atmosphere has decreased to 50 °C or less. If the
thermocouple voltage is large, accurate measurement cannot be achieved.
12.1.2.3 Error3: A/D Converter Failure/Error4: 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.
8th Edition : Jan.13,2012-00