User Guide

11
HOW TO ENSURE ACCURATE MEASURE-
MENTS
• Each time the cuvet is used, tighten the cap
to the same degree.
• Discard the sample soon after the reading is
taken to avoid permanently clouding the glass.
• All glassware used to contain the standards
and the samples should be maintained clean,
washed with HI93703-50 cleaning solution
and rinsed with HI 93703-0 or turbidity-free
water.
• Collect the samples in clean glass or plastic
bottles, fit stoppers and perform the analysis
quickly. If unavoidable, store the sample in
a cool, dark place, but not for longer than 24
hours (the sample needs to be kept at room
temperature prior to the analysis).
• To obtain a representative sample, gently,
but thoroughly, mix it before samples are
taken. Do not shake (to prevent air bubbles)
and do not let the sample settle.
• It is recommended to monthly calibrate the
meter with the supplied HI93703-10 @10
FTU* standard or more frequently for great-
est accuracy.
• Before inserting vials
into the instrument,
wipe them with
HI93703-70 soft, lint-
free tissue. Handle vi-
als so that no finger-
prints can get on the
areas where light
passes (approximately
2 cm/1 inch from the
bottom of the vial).
If you experience any problems in taking mea-
surements, please contact your dealer or the
nearest Hanna Instruments Customer Service
Department.
* 1 FTU = 1 NTU