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GA EvolutionDeLuxe 1-06511-1107_GA pH ControllerEvol.Del. 13.06.2013 09:45 Seite 33
15.3 Possible causes of faults
Fault
Calibration not possible, The electrode is in pH 7 (pH 4) calibration solution,
or "Err" appears on
display
F 01" appears
on display
No supply of CO
,
2
although indicator lamp
or CO
supply is ON
2
Display blank
16 Cleaning the surfaces
Use a moist cloth and a mild detergent. Do not use any aggressive detergents or solvents!
Cause
but the "pH 4" ("pH 7") key has been pressed.
Calibrating solutions are contaminated/too old
pH-electrode soiled
pH-electrode worn out or defective
Electrode cable not connected properly
Electrode cable defective
Measured value outside of measuring range
Problem with CO
supply
2
Solenoid valve not connected properly or defective
Fuse defective
Controller defective
Remedy
Repeat calibration procedure, beginning with pH 7
Use fresh calibrating solutions, repeat calibration
Clean pH-electrode (see 6.1).
Connect new pH-electrode and calibrate; carry
out additional calibration after 1 week
Check connection
Replace electrode
---
Check CO
system (e.g. cylinder empty?
2
Needle valve closed? Hose connection leaking?)
Check connection,
replace solenoid valve if necessary
see point 15.1
Send controller in to DENNERLE after-sales servi-
ce for inspection.
33
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