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Idiomas disponibles
What to do if ...
Measured value
unstable
Slope too low
22
Calibration line of a fluoride sensitive electrode
Electromotive force
Meßkettenspannung
What to do if ...
Cause
– Inner junctions not
sufficiently wetted with
bridge electrolyte
– Inner junctions encrusted
– Ground junction
contaminated
– Cable broken
Cause
– Membrane surface
contaminated
– Conditioning time too short
– Standard solutions too old
10-fold concentration change
10-fache Konzentrationsänderung
~58
0.1
1
10
-5
-4
10
10
10
Remedy
– Fill up bridge electrolyte until the inner
junctions are covered with bridge
electrolyte
– Leave the bridge electrolyte to react on
the inner junctions for some hours until
the crusts have dissolved.
– Rinse ground junction with bridge
electrolyte
– Exchange the electrode
Remedy
– Clean the membrane surface (see
M
AINTENANCE
– Extend the conditioning time
– Use new standard solutions
mV
100
1000
-3
-2
-1
10
10
mol/l F
)
ba15358d04
F 800
mg/l
12/2021
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