Hach-Lange LZU5395 - Manual (Page 4)

4
Introduction
The 53 95 is a cell for measuring low con-
ductivities. They include an integrated Pt
1000 temperature sensor.
SAFETY NOTE
Before use with hazardous substances,
find out about the relevant hazards,
protective measures, and what to do in
an emergency.
Cell preparation
Before use for the first time immerse
the electrodes in ethanol for 15 s, and
rinse with distilled water. Apply the same
procedure for a cell not being in use for
long time.
Installation
In immersion, insertion, flotation housings,
etc. with PG 13,5 thread.
See Housing instruction manual.
Cable. They are connected to coaxial
cables with an AS9 connector.
Calibration
Before measurement, calibrate with
standard solutions.
See User’s Manual of conductivity meter.
Measurements. Recommendations
• Both, calibration and measurement
must be performed under slight stirring
of standards and samples. The stirring
speed in the two cases should be iden-
tical.
• The sample must cover the measuring
electrodes 5 .
• Ensure that during measurement there
are not air bubbles over the measuring
electrodes.
• After measurement, rinse the cell with
distilled water or with sample to be
measured.
Warning.
The cell is made of glass, any abrupt ma-
nipulation could break it.
Maintenance
Keep the electrodes surface clean
5 .
If the thorough rinse with distilled water
is not sufficient, suitable solvent for the
elimination of sample rests can be used.
This solvent must not produce chemical
attack over the cell materials.
Inorganic contamination: Immerse
the cell in diluted hydrochloric acid or in
chromic acid. Afterwards rinse thoroughly
with distilled water.
Organic contamination: Use suitable
solvent (see cell’s materials), next utilize
alcohol and distilled water as in Cell prep-
aration is described.
Do not apply any mechanical cleaning
over the platinum cell.
Conductivity cell
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