VWR MD 8000 L, Руководство по эксплуатации

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What to do if... MD 8000 L
84
ba77218e01 11/2018
15 What to do if...
15.1 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
IDP pH sensor:
– The measured value is outside
the measuring range of the
meter
– Use a suitable IDP pH sensor
– Air bubble in front of the junction – Remove air bubble
(e.g. sway or stir the solution)
– Air in the junction – Extract air or moisten junction
– Cable broken – Replace the sensor
– Gel electrolyte dried out – Replace the sensor
Cause Remedy
IDP pH sensor:
– The values determined for zero
point and slope of the IDP pH
sensor are outside the allowed
limits.
– Recalibrate
– Junction contaminated – Clean junction
– Sensor soiled – Clean the sensor
– 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