8
• The mark on the cuvette cap should
point towards the keyboard.
• Press the READ/▲ key and the LCD will display an intermittent
“SIP” (Sampling In Process).
• The turbidity value will appear after ap-
proximately half a minute.
• Though LP 2000 covers a wide turbidity range, highly accurate
readings exceeding 40 FTU require dilution as recommended 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 = LP 2000 reading (exceeding 40 FTU)
E.g.: LP 2000 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:
T
a
= actual turbidity value of the original sample
T
n
= LP 2000 reading of the diluted solution
E.g. If T
n
= 27
T
a
= 27 x 100 mL / 15 mL = 180 FTU
