User guide

HandyLab 600 What to do if...
ba77064e01 03/2014 59
11 What to do if...
11.1 pH
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
IDS pH sensor:
– The measured value is outside
the measuring range of the
meter
– Use suitable IDS pH sensor
– Air bubble in front of the junction – Remove air bubble
(e.g. sway or stir the solution)
– Gel electrolyte dried out – Replace the sensor
Cause Remedy
IDS pH sensor:
– The values determined for zero
point and slope of the IDS pH
sensor are outside the allowed
limits.
–Recalibrate
– Sensor broken – Replace the sensor
Buffer solutions:
– The used buffer solutions do not
agree with the set buffer set
– Set different buffer set
or
– Use different buffer solutions
– Buffer solutions too old – Use only once.
Note the shelf life
– Buffer solutions depleted – Change solutions