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What to do if...
Error message
OFL, UFL
Error message,
88
6.2
pH
Cause
IDS pH sensor:
– Measured value outside the
measuring range
– Air bubble in front of the dia-
phragm
– Air in the diaphragm
– Cable broken
– Gel electrolyte dried out
Cause
Error
IDS pH sensor:
– The values determined for zero
point and slope of the IDS pH
sensor are outside the allowed
limits.
– Junction contaminated
– IDS pH sensor broken
– Buffer solutions:
– Wrong buffer solutions
– Buffer solutions too old
– Buffer solutions depleted
Remedy
– Use suitable IDS pH sensor
– Remove air bubble
– Extract air or moisten dia-
phragm
– Exchange IDS pH sensor
– Exchange IDS pH sensor
Remedy
– Recalibrate
– Clean the junction
– Exchange IDS pH sensor
– Change calibration proce-
dure
– Use only once.
Note the shelf life
– Change solutions
ba75863e02
Multi 3410
12/2009
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