Xylem wtw Cl 800 DIN Mode D'emploi page 22

Calibration line of a chloride sensitive electrode
Measured value
unstable
Slope too low
22
Calibration line of a chloride sensitive electrode
Electromotive force Meßkettenspannung
0.1
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 mV
1 10
-3
-4
-5
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
– Polish the membrane surface with
polishing strip S/FK (see M
– Extend the conditioning time
– Use new standard solutions
1000 mg/l Cl
100
-2
-1
10 10
mol/l Cl
AINTENANCE
ba15355d04
Cl 800
-
-
)
12/2021