What to do if...
pH 1970i
56
ba75690e01
01/2007
No stable measured
value
Display LoBat
Buffer solutions:
– Incorrect buffer solutions
– Change calibration procedure
– Buffer solutions too old
– Use only once.
Note the shelf life
– Buffer solutions depleted
– Change solutions
Cause
Remedy
pH electrode:
– Diaphragm contaminated
– Clean diaphragm
– Membrane contaminated
– Clean membrane
Test sample:
– pH value not stable
– Measure with air excluded if
necessary
– Temperature not stable
– Adjust temperature if
necessary
Ele test sample:
– Conductivity too low
– Use suitable electrode
– Temperature too high
– Use suitable electrode
– Organic liquids
– Use suitable electrode
Cause
Remedy
– Battery almost empty
– Charge the battery (see
section 3.2)
