Yokogawa DO402 Dissolved Oxygen Analyzer - Manual (Page 81)

IM 12J05D02-01E
Troubleshooting 8-3
Error Generation
Error content and Causes Countermeasures
No. Mode
E10 All modes EEPROM writing failure Turn off the power and then turn it
Electronic circuit failure back on and check whether or not the
system returns to normal.
If the failure occurs again, contact
Yokogawa to request repair.
E12 All modes Abnormal measured value Examine the setting for CODE 01, 02
The dissolved-oxygen value (%sat.) exceeds 10, 12 & 54.
150 % (or value set in CODE 54) Accurately perform calibration.
E15 CODE 12 Temperature error correction failure Accurately measure the temperature of
The difference between the corrected value the measuring solution (dissolved oxygen
and the standard value exceeds the range sensor).
corresponding to ±7.5°C (±13 5°F). Examine whether the sensor cable fails
• Temperature entry is not accurate. (partial disconnection or degraded
• Sensor cable failure insulation) and then correct the
temperature error again.
E16 All modes Call for maintenance-interval time exceeded Perform maintenance. Reset interval.
E17 RANGE mode Incorrect span. Change the maximum or minimum value
In the range setting, a value which makes in the range so that a span more than
the span less than 1.0 mg/l (or ppm) or 10 the permissible value is obtained.
% sat. has been set.
E18 CODE 35 & 36 Table values make no sense. Reprogram.
E19 At data entry Configuration failure Re-enter a value within the permissible
A value not within the permissible range range.
is entered.
E20 All modes Instrument initialization failure Repair is necessary. Contact Yokogawa
to request repair.
E21 All modes EPROM comparison failure Repair if necessary. Contact Yokogawa
to request repair.
E22 All modes The time-out interval for high or low Take measures depending on the purpose
alarm has elapsed. to use this function.
(if the function is enabled in CODE 47) Reset the error with the ( NO) key or
( YES) key.
NOTE:
It is possible that the error message does not disappear immediately after corrective measures.
Then turn power off and the turn it back on and check whether the system returns to normal.