Endress+Hauser TopCal S CPC 300, Руководство по эксплуатации

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8 Troubleshooting TopCal S CPC 300
118 EHauser
8.1.2 Process-specific errors
Error Possible cause Remedial action Equipment needed, spare
parts
Instrument unconfig-
urable,
Display for code
prompt is 9999 Instrument hardware is locked via
keypad (Keys "CAL" + "DIAG"
simultaneously = security locking) Press "MEAS" and "PARAM" simulta-
neously to unlock.
No automatic calibra-
tion possible, as
measuring chain zero
point not settable Reference system poisoned Test with new electrode. pH/mV electrode
Diaphragm blocked Clean or grind diaphragm. HCl 3%, file (only file in one direc-
tion)
Measuring line broken pH input on instrument
short-circuit
⇒
Display pH7
Reterminate or use new cable
Unsymmetrical sensor voltage too
high Clean diaphragm or test with differ-
ent electrode. HCl 3%, file (only file in one direc-
tion)
Potential matching (PA/PM)
Mycom
⇔
Incorrect medium
asymm.: no PA or PA on PE
symm.: PA connection needed Connection s. chap. 4
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 diaphragma or
missing electrolyte
No automatic calibra-
tion possible as meas-
uring chain slope not
adjustableslope too
small Connection not at high impedance
(humidity, dirt) Test cable, connector and junction
boxes. pH simulator
Instrument input defective Directly test instrument. pH simulator
Electrode aged Replace electrode. pH electrode
No automatic calibra-
tion possible as meas-
uring chain slope not
adjustable/no slope Hairline crack in glass membrane Replace electrode. pH electrode
Connection not at high impedance
(humidity, dirt) Test cable, connector and junction
boxes. pH simulator, see also Chap. 7.3.2
Semi-conductor layer in measur-
ing cable not removed Check inner coaxial cable, remove
black layer.