YOKOGAWA PH200, Instruction Manual

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Code Error description Possible cause Suggested remedy
E0 Temperature of the buffer liquids is Buffer liquid is too hot Cool buffer liquid
out of range of 0 to 50 °C Bufer liquid is too cold Warm buffer liquid
E1 Measurement has not stabilized Electrodes are fouled Clean electrodes
during calibration Glass electrode too slow Use other type (faster)
Wrong type of glass electrode Use other type
E2 Calculated asymmetry potential out Calibration at pH 7 incorrect Recalibrate at pH 7
of range of -120 to +120 mV Check if buffer solution is fresh
E3 Calculated slope is out of range of Glass electrode has aged Replace glass electrode
70 to 110 % theoretical value Bad isolation on input Dry or replace cable
E4* Impedance of glass electrode too low Glass electrode cracked or broken Replace glass electrode
E5* Impedance of glass electrode too high Glass electrode coated or fouled Clean or replace glass electrode
Open circuit on measurement Check connections and cables
E6* Impedance of reference electrode too high Reference electrode fouled or clogged Clean or replace glass electrode
Liquid earth disconnected Clean or replace glass electrode
Sensors not fully immersed Check installation
E7* Measured temperature too high Process temperature too high Cool process or use sample loop
i.e. above 130 °C Wrong temperature sensor used Correct setting (§7-4)
Temperature sensor damaged Check connections and sensor
E8* Measured temperature too low Process temperature too low Warm process or use sample loop
i.e. below -10 °C Wrong temperature sensor used Correct setting (§7-4)
Short circuit in temperature input Check connections and sensor
E9* Measured value is out of pH range Temperature element broken Replace temperature sensor
of -1 to 15 pH Temperature sensor disconnected Set temperature to manual
E10* EEPROM write error Fault in electronics Try again, if not succesful call your nearest
Yokogawa office
E15 Cable resistance to temperature sensor Cable resistance too high Use Pt1000 for accurate results
exceeds 5
Ω
Corroded contacts Clean contacts and tighten
E17 Output inside minimum span < 1pH Incorrect programming by user Correct programming
E19 Programmed values are not accepted Incorrect programming by user Correct programming of last function
E20 All programmed values are lost Fault in electronics Call nearest Yokogawa office
Severe interference
When errors appear that are not mentionbed in this list, please consult the Yokogawa service organization. A maximum of 2 errors can be
indicated at the same time. *See §6-1.
IM 12B6C2-E-H
29
6-2. Error messages and explanation