wtw pH 340/ION, Instruction Manuals

Page: 61 / 106

Troubleshooting
pH 340/ION
61
pH system messages
System message Cause Action
0FL 0FL 0FL 0FL
Indication range
exceeded
pH electrode:
•
Not immersed
•
Cable broken
•
Electrolytic gel dried
• Air bubble in front of
diaphragm
•
Air in diaphragm
pH electrode:
Immerse into sample solution
Exchange electrode
Exchange electrode
Remove air bubble
Suck off air or moisten
diaphragm
E3
E3 E3
E3
Slope or asymmetry
outside of
admissible ranges
(Slope:
-50 ... -62 mV/pH;
Asymmetry:
-30 ... +30 mV)
pH electrode:
• pH electrode too old
• Diaphragm contaminated
• Membrane contaminated
• Moisture in the plug
• Electrolytic gel too old
Meter:
• Wrong calibration procedure
• Wrong temperature of
solution
(
Without
temperature probe only)
• Moisture in the socket
Buffer solution:
• Unsuitable buffer solutions
• Buffer solutions too old
• Used up buffer solutions
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.