User Guide

10
* 1 FTU = 1 NTU
• Even though HI93703 covers a very wide
range of turbidity values, for very accurate
measurements of samples exceeding
40FTU*, Standard Methods require dilu-
tion. In such cases, the correct amount of
HI93703-0 or turbidity-free water to be
added to the sample can be calculated
as follows:
Vos = 3000 / T
where: Vos = volume of sample (mL) to be
combined with HI 93703-0 to
obtain the final volume of
100 mL.
T = HI 93703 reading (exceeding
40FTU*)
E.g.: HI 93703 reading = 200 FTU *
3000 / 200 = 15 mL (Vos)
15 mL (Vos)+85 mL (HI93703-0) = 100
mL
At this point, take a sample of this solution
and measure turbidity.
The correct turbidity value of the original
sample will be:
T
n
x 100 mL / Vos = T
a
where: T
n
= new HI 93703 reading
T
a
= actual turbidity value of the original
sample