Hach-Lange POLYMETRON 83xx User Manual - Manual (Page 30)

2 E LECTRODES C ONDUCTIVITY P ROBE - I NSTRUCTION M ANUAL
Page 26 09/2010 621=183=000 Issue B
Electrodes: Check the insulation
between the two electrodes (R infinite
when probe exposed to air and dry).
Pay attention to the maintenance of
the probes!
E The difficult conditions in which the
conductivity probes are often used makes
a periodic cleaning programm almost
obligatory.
This will contribute towards avoiding
accumulation at the surface of the
electrode of insulating layers leading to a
too weak reading of conductivity.
Ö In most uses, washing in hot water
with a household washing up liquid is
sufficient.
Ö
Greasy or oily layers can be
eliminated with methanol or ethanol.
Ö With solutions containing bacteria or
algae, use a chlorinated cleaning
product such as bleach.
Ö In the case of deposits of metallic
hydroxide, soak the probe for 10 mn in
a 20 % nitric acid solution.
F Carefully recalibrate the measurement
loop (See Chapter 3 - Calibration)