Campbell Scientific OBS500 Smart Turbidity Meter with ClearSensor Technology - Manual (Page 33)

OBS500 Smart Turbidity Meter with ClearSensor™ Technology
universal response curve. However, there is residual nonlinearity that is
removed by calibration and by computation of a TU value with a 2nd-order
polynomial. This section explains how to do a turbidity calibration.
0 1000 2000 3000 4000
Turbidity (TU)
0.0
0.2
0.4
0.6
0.8
1.0
N
or
m
al
iz
ed
O
B
S-
3+
R
es
po
ns
e
(O
PV
33
0
VC
SE
L)
FIGURE 7-5. Normalized response of OBS500 to AMCO Clear ®
turbidity. The inset shows the response function of a turbidity
sensor to high-sediment concentrations.
AMCO Clear ® SDVB turbidity standards are used to calibrate an OBS500
sensor. SDVB standards are made for individual instruments. Standards made
for one model of turbidity meter cannot be used to calibrate a different model.
0 20000 40000 60000
SSC (mg/l)
0
1000
2000
3000
4000
Tu
rb
id
ity
(N
TU
)
A B C
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