11
HOW TO ENSURE ACCURATE MEASUREMENTS
• Each time the cuvette 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 HI 93703-50
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 HI 93703-10 @10 FTU* standard or more frequently
for greatest accuracy.
• Before inserting vials into the
instrument, wipe them with
HI 93703-70 soft, lint-free
tissue. Handle vials so that no
fingerprints 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 measurements, please
contact your dealer or the nearest Hanna Instruments Customer
Service Department.
* 1 FTU = 1 NTU
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