Yokogawa DO402 Dissolved Oxygen Analyzer - Manual (Page 88)

IM 12J05D02-01E
10-4 Appendix
Error codes
Code Error description Possible cause Suggested remedy
E1 Response time failure. Calibration failed to Temperature unstable Avoid draughts and
reach stability in 1 hour direct sunshine
E2 Zero calibration out of limits Zero calibration not properly performed Repeat carefully
Check limits ± 0.5 µA (±5.0nA)
E3 Slope calibration out of limits Calibration not properly performed Repeat carefully
Check limits 40 to 200 % Wrong membrane thickness set Check code 01
E4 Membrane failure Perforated membrane Replace and recalibrate
E7 Temperature too high Process temperature too high Check process
> 50 °C/122 °F Wrong sensor programmed Check model code sensor
Incorrect wiring Check connections and cable
E8 Temperature too low Process temperature too low Check process
< 0°C/32 °F Wrong sensor programmed Check model code sensor
Incorrect wiring Check connections and cable
E9 Cell current abnormal Sensor fault Check membrane
Galvanic : outside -10 to 50 µA Programming fault Check setup
Polarographic: outside -100 to 500 nA
E10 EEPROM write failure Fault in electronics Try again, if unsuccessful
contact Yokogawa
E12 Abnormal measured value. Wrong DO sensor or temperaure Check code 01, 02, 10,
The dissolved oxygen value (%sat.) sensor programmed. 12 and 54.
exceeds 150%. (or value set in Code 54) Incorrect wiring. Accurately perform calibration.
E15 Cable resistance influence to temperature Cable resistance too high Check cable
exceeds ±7.5°C (±13.5°F) Corroded contacts Clean and reterminate
Wrong sensor programmed Reprogram
E16 Call for maintenance inetrval time System not maintained in Perfrom maintenance
exceeded. preset time period Reset interval
E17 Output span too small Incorrect configuration by user Reprogram
E18 Table values make no sense Wrong data programmed Reprogram
E19 Programmed values outside acceptable limits Incorrect configuration by user Reprogram
E20 All programmed data lost Fault in electronics Contact Yokogawa
Very severe interference
E21 Checksum error Software problem Contact Yokogawa
E22 Alarm activation time exceeded Process control not effective Check control equipment
within set time Adjust value in code 47