HF scientific MicroTPW Field Portable Turbidimeters - Manual (Page 16)

MicroTPI & MicroTPW (5/10)
Rev. 1.9
10
5.0 Routine Maintenance
If the instrument is not kept in the supplied carrying case, when not in use, ensure that the
instrument has been turned off and that a clean sample cuvette 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 Cuvette Cleaning and Care
Proper measurement of the turbidity of a sample requires the use of a cuvette that is free
of marks, smudges, scratches and any bacterial growth. Cleaning the cuvette is
accomplished by washing the interior and exterior of the cuvette in a detergent solution.
Once cleaned, the cuvette should be rinsed thoroughly 8 to 10 times with clean distilled
water to eliminate the possibility of detergent buildup and streaking. Cleaned and dried
cuvettes should be stored with the black caps on. During normal operation any typical
glass cleaner along with a lint free cloth or tissue (Kimwipes®), may be used to clean the
outside of the cuvettes.
Condensation may appear on the cuvette when a sample is very cold and the relative
humidity is high. When this happens, the turbidity displayed may be higher than the
actual turbidity due to the light scattered by the condensate on the cuvette. To alleviate
the problem, either coat the cuvette with an anti-fogging agent, or by running warm water
over the cuvette for a short period of time to warm the sample prior to measurement.