Hanna-instruments HI 83749 Bedienungsanleitung PDF herunterladen (Seite 20)

DETERMINATION OF BENTONITE REQUIREMENT

SAMPLE PREPARATION

• Fill 4 HANNA vials with 25 mL of

unfiltered wine

sample.

• Prepare a bentonite suspension of 2.5%.

Note: use always a bentonite suspension with

the same wetting degree as the suspension that

is used in production.

• Use the 1 mL syringe to add 0.25 mL of

bentonite suspension to the vial #1; then add

0.50 mL to #2, 0.75 mL to #3 and 1 mL to

#4.

Note: in order to measure the exact volume of

bentonite suspension with the syringe, follow

the instructions on page 11.

• Close the glass vials tightly with their caps and

mix thoroughly.

#1 #2 #3 #4

0.25

0.50

0.75

1 mL

• Wait for 15 minutes to allow suspended matter

to settle.

• Fold a filter disc twice as shown in the figure.

• Separate one side from the other three to form

a cone. Insert the folded filter disc in the funnel.

• Decant off clear liquid and filter the treated wine

from vial #1 into cuvet #1 to collect 10 mL

of filtered sample. Place the cap #1 and wipe

the cuvet thoroughly with a lint-free cloth (see

General Tips for an accurate measurements,

page 10).

• Prepare fresh filters and repeat the filtration for

all treated wine samples (#2, #3,#4).

#1 #2 #3 #4

READING PROCEDURE

• Turn the instrument ON by pressing ON/OFF.

When the LCD displays “----”, the instrument

is ready.

• Select the AVG mode by pressing the AVG

key. The AVG icon will appear on the display.

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