wtw inoLab 740, Operating Manual

Page: 239 / 274

What to do if...
239
14.3 pH/voltage system messages
Measuring modules for the inoLab Level 3:
pH, pH/ION, pH/Cond, pH/Oxi and Multi.
Error message
OFL
Error message
E3
Cause Remedy
pH/voltage, electrode:
– Not connected – Connect electrode
– Air bubble in front of the
diaphragm
– Remove air bubble
– Air in the diaphragm – Extract air or
moisten diaphragm
– Cable broken – Replace electrode
– Gel electrolyte dried out – Replace electrode
Cause Remedy
pH/ORP electrode:
– Diaphragm contaminated – Clean diaphragm
– Membrane contaminated – Clean membrane
– Moisture in the plug – Dry plug
– Electrolyte out of date – Replenish electrolyte or
replace electrode
– Electrode worn out – Replace electrode
– pH electrode: broken – Replace electrode
– ORP electrode: short-
circuit
– Replace electrode