Hanna Instruments HI 95747C - Manual (Page 11)

11
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 powder reagent packet:
(a) use scissors to open the powder packet;
(b) push the edges of the packet to form a spout;
(c) pour out the content of the packet.
Under range. A blinking "0.000" 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.
GENERAL TIPS FOR AN ACCURATE MEASUREMENT
(a) (b) (c)