Hanna Instruments HI 95715 - Manual (Page 11)

11
Under range. A blinking "0.00" indicates that the sample absorbs
less light than the zero reference. Check the procedure and make
sure you use the same cuvet for reference (zero) and measurement.
A flashing value of the maximum concentration indicates an
over range condition. The concentration of the sample is beyond
the programmed range: dilute the sample and re-run the test.
A flashing value lower than the maximum concentration indicates
a low signal-to-noise ratio condition. In this case accuracy of the
result is not guaranteed. Repeat the measurement procedure.
The instructions listed below should be carefully followed during testing to ensure best accuracy.
• Color or suspended matter in large amounts may
cause interference, therefore these should be
removed by treatment with active carbon and by
prior filtration.
• For a correct filling of the cuvet: the liquid in
the cuvet forms a convexity on the top; the
bottom of this convexity must be at the same
level of the 10 mL mark.
• Proper use of the dropper:
(a) to get good reproducible results, tap the dropper on the table for several times and wipe
the outside of the dropper tip with a cloth.
(b) always keep the dropper bottle in a vertical position while dosing the reagent.
GENERAL TIPS FOR AN ACCURATE MEASUREMENT
(a) (b)