Calibration Line Of A Cyanide Sensitive Electrode; What To Do If - Xylem wtw CN 800 DIN Operating Manual

Calibration line of a cyanide sensitive electrode

Measured value
unstable
Slope too low
22
Calibration line of a cyanide sensitive electrode
Meßkettenspannung Electromotive force
0.1
-6
10

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
10-fold concentration change 10-fache Konzentrationsänderung
~58
1 10
-4 -3
-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
mV
100 1000 mg/l CN
-2
-1
10
10
mol/l CN
AINTENANCE
ba15356d04
CN 800
-
-
)
12/2021