Hanna-instruments LP 2000-11 Uživatelský manuál stáhnout pdf (Strana 5)

• Even though LP2000-11 covers a wide turbidity range, highly

accurate readings exceeding 40 FTU* require dilution as recom-

mended by the Standard Methods.

Use the formula below to calculate the amount of HI 93703-0 or

turbidity-free water needed for accurate dilution.

The total volume = 100 mL.

Vos = 3000 / T

where:

Vos = volume of original sample (mL) to be added to HI 93703-0

to obtain the total diluted volume of 100 mL.

T = LP2000-11 reading (exceeding 40 FTU)

E.g.: LP2000-11 reading = 200 FTU*

3000 / 200 = 15 mL (Vos)

15 mL (Vos)+85 mL (HI 93703-0) = 100 mL

At this point, take a sample of this diluted solution and measure its

turbidity.

The correct turbidity value of the original sample is derived by:

Ta= Tn x 100 mL / Vos

where:

= actual turbidity value of the original sample

= LP2000-11 reading of the diluted solution

E.g. If T

= 27

= 27 x 100 mL / 15 mL = 180 FTU*

Note: Any sample above 1000 FTU* will show out of range by blinking

“1000”.

* 1 FTU = 1 NTU

Note: Wipe the cuvet thoroughly with

HI93703-70 or a lint-free tissue before

inserting it into the measurement cell.

The cuvet must be completely free of

fingerprints and other oil or dirt, par-

ticularly in the area where the light goes

through (approx. the bottom 2 cm/1").

• Place the cuvet into the cell and

check that the notch on the cap is

positioned securely into the groove.

• The mark on the cuvet cap should point

towards the keyboard.

• Press the READ key and the LCD will

display a blinking “SIP” (Sam-

pling in Process). The turbidity

value will appear after approxi-

mately 20 seconds.

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