Xylem WTW pH/Cond 3320, Operating Manual

Page: 67 / 82

pH/Cond 3320 What to do if...
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12 What to do if...
12.1 pH/ORP
Error message
OFL, UFL
The measured value is outside the measuring range.
Error message,
Error
More information and instructions on cleaning and exchange of
sensors are given in the documentation of your sensor.
Cause Remedy
Electrode:
– Air bubble in front of the junction – Remove air bubble
– Air in the junction – Extract air or moisten junction
– Cable broken – Replace electrode
– Gel electrolyte dried out – Replace electrode
– The measured value is outside
the measuring range of the meter
– Use suitable combination
electrode
Cause Remedy
Electrode:
– The values determined for zero
point and slope of the combina-
tion electrode are outside the
allowed limits.
– Recalibrate
– Junction contaminated – Clean junction
– Electrode broken – Replace electrode
Buffer solutions:
– Incorrect buffer solutions – Change calibration procedure
– Buffer solutions too old – Use only once.
Note the shelf life
– Buffer solutions depleted – Change solutions