Hanna Instruments HI 96751 User Manual

Page 6

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 cuvette: the liquid in the

cuvette forms a concavity on the top; the bottom of this
concavity 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.

• It is important that the sample does not contain any debris. This would corrupt the reading.
• Each time the cuvette is used, the cap must be tightened to the same degree.

GENERAL TIPS FOR AN ACCURATE MEASUREMENT

Under range:

A blinking “0” indicates that the sample absorbs

less light than the zero reference. Check the procedure and make
sure you use the same cuvette for reference (zero) and
measurement.

Over Range:

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.

c) during calibration procedure

Standard Low:

The standard reading is less than expected.

Standard High:

The standard reading is higher than expected.

Cap error:

Appears when external light enters in the analysis

cell. Assure that the cuvette cap is present.

Cooling lamp:

The instrument waits for the lamp to cool down.

d) other errors and warnings

Battery low:

The battery must be replaced soon.

Dead battery:

This indicates that the battery is dead and must

be replaced. Once this indication is displayed, the meter will
lock up. Change the battery and restart the meter.