Hanna-instruments HI 83208-2008 Instrukcja Użytkownika Pobierz pdf (Strona 28)

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SPECIFICATIONS

Range 6.5 to 8.5 pH

Resolution 0.1 pH

Accuracy ±0.1 pH

Typical EMC ±0.1 pH

Deviation

Light Source Tungsten lamp with narrow band interference filter @ 525 nm

Method Adaptation of the Phenol Red method. The reaction with the reagent causes a yellow

to red tint in the sample.

REQUIRED REAGENTS

Code Description Quantity

HI 93710-0 Phenol Red Indicator 5 drops

REAGENT SETS

HI 93710-01 Reagents for 100 pH tests

HI 93710-03 Reagents for 300 pH tests

For other accessories see page 73.

MEASUREMENT PROCEDURE

• Select the

method using the procedure described in the

Method Selection

section (see page 12).

• Fill the cuvette with 10 mL of unreacted sample (up to the

mark) and replace the cap.

• Place the cuvette into the holder and close the lid.

• Press ZERO key. The display will show “-0.0-” when the meter

is zeroed and ready for measurement.

• Remove the cuvette and add 5 drops of HI 93710-0 Phenol

Red Indicator. Replace the cap and mix the solution.

10 mL

x 5

Dissolved Oxygen

• Let the sample stand and the flocculent agent will start to settle.

• After approximately 2 minutes, when the upper half of the bottle becomes

limpid, add 10 drops of HI 93732C-0.

• Replace the cap and invert the bottle until the settled flocculent dissolves completely. The sample is

ready for measurement when it is yellow and

completely limpid.

• Fill the cuvette up to the mark with 10 mL of the unreacted (original)

sample, and replace the cap. This is the blank.

• Place the cuvette into the holder and close the lid.

• Press ZERO key. The display will show “-0.0-” when

the meter is zeroed and ready for measurement.

• Remove the cuvette.

• Fill another cuvette up to the mark with 10 mL of the reacted sample and

replace the cap.

• Reinsert the cuvette into the instrument.

• Press READ to start the reading. The instrument will display the results in mg/L of dissolved oxygen.

10 mL

x 10

INTERFERENCES

Interferences may be caused by reducing and oxidizing materials.

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