Troubleshooting; Ph System Messages - wtw sentix 41 Bedienungsanleitung

pH system messages

System message
/ / / /
Indication range
exceeded
Slope or asymmetry
outside of
admissible ranges
(Slope:
-50 ... -62 mV/pH;
Asymmetry:
-30 ... +30 mV)

Troubleshooting

Cause
pH electrode:
• Not immersed
• Cable broken
• Electrolytic gel dried
• Air bubble in front of
diaphragm
• Air in diaphragm
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
S+
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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