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EUTECH INSTRUMENTS TURBIDIMETER TN-100 WATERPROOF PORTABLE METER Manual de instrucciones Pagina 20

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Instruction Manual TN-100/ T-100
16
5 ROUTINE MAINTENANCE
The supplied carrying case is optimal for protecting the instrument. If you
do not plan on leaving the instrument in the supplied carrying case, when
not in use, ensure that the instrument has been turned off and that a clean
sample vial fitted with a black cap has been placed in the sample well.
This will ensure that a minimal amount of dust and/or debris will be able to
settle on the optics of the instrument.
5.1
Vials – Handling, Cleaning and Care
Proper measurement of the turbidity of a sample requires the use of a vial
that is free of marks, smudges, scratches and any bacterial growth.
Therefore, sample vials must be handled with absolute care to avoid
contamination or damage, which might change the optical characteristics
of the glass. Scratches, fingerprints, and water droplets on the sample vial
or inside the sample well can cause stray light interference leading to
inaccurate readings.
Cleaning the vial is accomplished by washing the interior and exterior of
the vial in a detergent solution. Once cleaned, the vial should be rinsed
thoroughly 8 to 10 times with clean distilled water to eliminate the
possibility of detergent buildup and streaking.
Vials can also be acid washed periodically and coated with a special
silicone oil to fill small scratches and mask the imperfections in the glass.
Since the silicone oil required for this application should have the same
refractive characteristics as glass, it is recommended that the oil be
obtained from us. Care should be taken not to apply excessive oil that
could attract dirt or contaminate the sample well of the meter. Once the oil
has been applied to the vial, the excess oil should be removed with a lint-
free cloth. The result should be a sample vial surface with a dry
appearance, but with all imperfections filled with oil.
Sample vials should always be handled from the top or by the cap to avoid
fingerprints or smudges. After a vial has been filled with a sample and
capped, the outside surface should be wiped with a clean, lint-free
absorbent cloth until it is dry. Cleaned and dried vials should be stored
with the black caps on. The vials can be stored in the carrying case.
During normal operation you may use any typical glass cleaner along with
a lint free cloth or tissue (Kimwipes®), to clean the outside of the vials.
Condensation may appear on the vial when your sample is very cold and
the relative air humidity is high. When this happens, the turbidity that you
read may be higher than the actual turbidity due to the light scattered by
the condensate on the vial. If you find yourself in this circumstance, you
can alleviate the problem by either coating the vial with an anti-fogging
agent, or by running warm water over the vial for a short period of time to
warm the sample prior to measurement.
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