Yokogawa EXA PH202 2-Wire pH/ORP Analyzer - Manual (Page 85)

IM 12B07D02-01E
Troubleshooting 8-3
Table 8-1. Error Codes
Code Error description Possible cause Suggested remedy
E0 Buffer solution temperature Buffer solution too hot or too cold Adjust buffer temperature
outside the programmed range Check cabling
E1 Measurement failed to stabilize. Sensors fouled Clean sensors
during the calibration Sensors too slow (aged sensor) Replace sensors
E2 Asymmetry potential too high. Sensors are aged or polluted Check buffer solution
(Limits set in service code 21.) Mistake in calibration Recalibrate at pH7
Replace sensor
E3 Slope (sensitivity) is outside limits. Measuring sensor aged Replace measuring sensor
(Limits set in service code 22.) Poor insulation at the connector Replace or dry cables
E4.1 Impedance of input 1 too low. Measuring sensor broken Replace measuring sensor
(Limits set in service code 03.) Damaged or damp connections Replace or dry cable
E4.2 Impedance of input 2 too low. Reference sensor broken Replace reference sensor
(Limits set in service code 04.) Damaged connections Replace cables
E5.1 Impedance of input 1 too high. Measuring sensor disconnected Check connections
(Limits set in service code 03.) Sensors not immersed in process Check process
Liquid earth disconnected Check connections
E5.2 Impedance of input 2 too high. Reference sensor fouled Clean or replace sensor
(Limits set in service code 04.) Liquid earth disconnected Check sensor immersion
Insufficient electrolyte Check electrolyte reservoir
E7 Temperature sensor open Process too hot or too cold Check process
> 140°C (or <-10°C for 8k55) Wrong temperature sensor setting Check sensor & setting
Temperature sensor damaged Check connections
E8 Temperature sensor shortened Process too cold or too hot Check process
< -30 °C (or > 120 °C for 8k55) Wrong temperature sensor used Check sensor & setting
Temperature sensor damaged Check connections
E9 Measurement out of range (-2 to 16 pH) Sensors disconnected Check cabling
Sensor wrongly connected Check cabling
Sensor(s) defective Replace sensor(s)
E10 EEPROM write failure Fault in electronics Try again, if unsuccessful
contact Yokogawa
E11 Wash recovery check error Measuring sensor aged Replace measuring sensor
(if communication is set to pH201*B in code Sensor still coated after washing Check cleaning system
60) Defective wash system If needed adjust timings
E12 ORP / rH outside of preset limits Sensors disconnected or wrongly Check cabling
connected
E14 No valid calibration data. Data lost after switching from Recalibrate
pH to ORP
E15 Cable resistance to temperature Cable resistance too high Use Pt1000Ω
sensor exceeds limit value. Corroded contacts Clean and reterminate
Wrong sensor programmed Reprogram
E16 Call for maintenance interval time exceeded. System not maintained in Perform maintenance
preset time period Reset interval
E17 Output span too small < 1pH Incorrect configuration by user Reprogram
E18 Table values make no sense
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
E23 Zero point outside limits Sensors are aged or polluted Check buffer solution
Mistake in calibration Recalibrate at pH7
Replace sensor
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