Troubleshooting - wtw MultiLine P4 Bedienungsanleitungen

Troubleshooting

pH system messages
System message
 /
Indication range
exceeded
Slope evaluation
"poor" or

Slope or asymmetry
outside of
admissible ranges
(Slope:
-50 ... -62 mV/pH;
Asymmetry:
-30 ... +30 mV)
Cause
pH electrode:
œ Not immersed
œ Cable broken
œ Electrolytic gel dried
œ Air bubble in front of
diaphragm
œ Air in diaphragm
pH electrode:
œ pH electrode too old
œ Diaphragm contaminated
œ Membrane contaminated
œ Moisture in the plug
œ Electrolyte solution too old
Meter:
œ Wrong calibration procedure
œ Wrong temperature of
(
solution Without
temperature probe only)
œ Moisture in the socket
Buffer solution:
œ Unsuitable buffer solutions
œ Buffer solutions too old
œ Used up buffer solutions
Action
pH electrode:
Immerse into sample solution
Exchange electrode
Exchange electrode
Remove air bubble
Suck off air or moisten
diaphragm
pH electrode:
Exchange pH electrode
Clean diaphragm
Clean membrane
Dry plug
Exchange electrode
Meter:
Select correct procedure
Set correct temperature
Dry socket
Buffer solution:
Use WTW Technical buffer
solutions
Pay attention to perishability of
solutions.
Use solutions only once.
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