Endress+Hauser TopClean S CPC 30, Руководство по эксплуатации

Страница: 102 / 146

8 Trouble-shooting TopClean S CPC 30
102 EHauser
8.1.2 Process-specific errors
Error Possible cause Remedial action Equipment needed, spare
parts
Instrument
unconfigurable,
Display for code prompt
is 9999 Instrument hardware is locked via
keypad (Keys "CAL" + "DIAG"
simultaneously = security locking) Press "MEAS" and "PARAM"
simultaneously to unlock.
No or slow
display change Electrode soiled Clean electrode. s. chap. 7.2
Electrode aged Replace electrode. New electrode
Electrode defective (reference lead) Replace electrode. New electrode
Inner buffer missing Check KCl supply (0.8 bar above
medium pressure). KCl (CPY 4-x)
Problem with diaphragm or
missing electrolyte Check KCl supply (0.8 bar above
medium pressure). KCl (CPY 4-x)
No calibration possible
as sensor adjustment
time too long. For IsFET sensor: Moisture film of
measuring surface interrupted due
to drying or blowing out with
compressed air. Ensure moisture film is present or
ensure buffer dwell time > 6 min.
Do not clean IsFET sensor with
compressed air.
Permanent, incorrect
measured value Electrode not immersing or
protection cap not removed Check installation position, remove
protection cap.
Air cushion in assembly Check assembly and installation
position.
Earth fault at or in the instrument Test measurement in insulated vessel,
possibly with buffer solution. Plastic vessel, buffer solutions.
Behaviour when instrument is
connected to process?
Hairline crack in glass membrane Replace electrode. pH electrode
Instrument in impermissible
operating status (no response on
pressing key) Switch instrument off and on. EMC problem: If repeated, check
grounding and wire routing
Incorrect temperature
reading Incorrect sensor connection Check connections using wiring
diagram. Wiring diagram s. page 15
Measuring cable defective Check cable. Ohmmeter
Incorrect sensor type selected Set sensor type on instrument
(Field 141). Check temperature sensor with
Ohmmeter.
Sensor defecitve Check sensor
pH value in process
incorrect No / incorrect temperature
compensation ATC: Activate function
MTC: Set process temperature
Conductivity of medium too low Select pH electrode with salt supply
or liquid KCl. e.g. Orbisint CPS 11-xASxx
or Ceraliquid CPS 41
Flow rate too high Reduce flow rate or measure in a
bypass.
Potential in medium Possibly earth with / at PA pin (connect
PA to PE). Problem mainly occurs in plastic lines
Device unsymmetrical and PML
connected Possibly earth with / at PA pin (connect
PA to PE).
Electrode soiled or with deposits Clean electrode (s. Chap. 8.8.1). Highly polluted media:
Use spray cleaning.