User Guide

9
NOTE: Wipe the cuvet thoroughly with a lint-
free tissue (HI93703-70) before in-
serting 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 se-
curely into the
groove.
• The mark on the
cuvet cap should
point towards the
LCD.
• Press the READ key
and the LCD will dis-
play a blinking “SIP”
(Sampling in Pro-
cess). The turbidity
value will appear af-
ter approx. 20 sec-
onds.
51
LOGGING
MICROPROCESSOR
TURBIDITY METER
LOGGING
MICROPROCESSOR
TURBIDITY
METER
HI 93703-11
VIEW
STO
CLR
GLP
CAL
DATE
READ
ALT
OFF
ON
10
* 1 FTU = 1 NTU
• Even though HI93703-11 covers a very
wide range of turbidity values, for very
accurate measurements of samples ex-
ceeding 40FTU*, Standard Methods re-
quire dilution. 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 (HI 93703-0) = 100 mL
At this point, take a sample of this solution
and measure its 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
E.g. If T
n
= 27 FTU *
T
a
= 27 FTU *x100 mL / 15 mL = 180 FTU *
NOTE: Any sample taken above 1000 FTU will
show out of range by blinking "1000".