16
OPERATIONAL GUIDE
• Internal communication error*
• Internal Bus error*
* Contact the Hanna Instruments office nearest to you.
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 the HI93703-50
cleaning solution and rinsed with HI93703-0 or turbidity-free
water.
• Collect the samples in clean glass or plastic bottles, fit stoppers
and perform the analysis quickly. If necessary, store the sample in
a cool, dark place, for up to a maximum of 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 calibrate the meter with the supplied
HI93703-10 @10 FTU* standard at least once a month or more
frequently for greater accuracy.
• Before inserting vials into the instrument, wipe them with
HI93703-70 or a soft, lint-free tissue. Handle vials so that no
fingerprints get on the areas where light passes (approx. the
bottom 2 cm/1 inch).
If you experience any problems in taking measurements, contact your
nearest Hanna Customer Service Center.
* 1 FTU = 1 NTU
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