Xylem ProLab 4000 MULTIPARAMETER BENCHTOP METER - Manual (Page 189)

ProLab 4000 What to do if...
189 ba75646e02 01/2010
16 What to do if...
16.1 pH and ORP measurement
Error message Err1
Error message Err2
Error message Err4
Error message, Error
Cause Remedy
pH electrode:
– Measured value outside the
measuring range
– Use a suitable electrode
– Air bubble in front of the dia-
phragm
– Remove air bubble
– Air in the diaphragm – Extract air or moisten junc-
tion
– Cable broken – Replace the electrode
– Gel electrolyte dried out – Replace the electrode
Cause Remedy
– No electrode connected – Connect the electrode
– Setting time during calibration
too long
– Adjust temperature if neces-
sary
– Recalibrate
Cause Remedy
– Temperature not stable during
calibration.
– Adjust temperature if neces-
sary
– Recalibrate
Cause Remedy
pH electrode:
– The values determined for zero
point and slope of the electrode
are outside the allowed limits.
– Recalibrate
– Diaphragm contaminated – Clean diaphragm