Safety Note; Installation; Maintenance - Hach 53 90 Handbuch

Conductivity cell
Introduction
The 53 90 is a cell for pipes and reactors.
They include an integrated Pt 1000 tem-
perature sensor.

SAFETY NOTE

Before use with hazardous substanc-
es, find out about the relevant haz-
ards, 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

The cell should always be mounted in im-
mersion or fl otation housings, with PG 13,5
thread.
See Housing instruction manual.
Cable (not included). Connected to mul-
tiple cables with MP-5 connector.
Mounting. Directly onto pipes or reactors.
Calibration
Before measurement, calibrate with stan-
dard 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
• 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.
With time and use the titanium alters
its colour. This change does not affect the
good functioning of the cell.

Maintenance

Keep the electrodes surface clean
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 chro-
mic 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 prepa-
ration is described.
Storage
Store the cell dry.
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