YSI VisoTurb 700 IQ - Manual (Page 30)

Measuring VisoTurb
®
700 IQ (SW)
4 - 4 ba76039e01 01/2012
Fig. 4-1 Ideal measurement environment for the application offset
4.2.3 User calibration for measuring the total
suspended solids (g/l TSS)
The turbidity values of the TSS measurement are converted into FNU
units for the concentration of dry substance. The g/l TSS measuring
mode displays the turbidity value as a secondary measured value in
FNU.
The correlation between the FNU units and the concentration of dry
substance is achieved via a user calibration. At the point of time of the
user calibration, the test sample should be in a state representative of
the later measurement (type and amount of total suspended solids,
coloration, etc.). The results of the user calibration are input manually
in the setting table of the VisoTurb
®
700 IQ (SW) (see section 3.4.2).
Setting for total
suspended solids
measurement
Marking in
this direction
approx. 20 cm
approx. 10 cm
1 Bring the sensor into the measuring position.
2 In the setting table of the turbidity sensor, select the g/l TSS
measuring mode and the AutoRange measuring range (see
section 3.4.2).
3 Switch to the measured value display with
m
.
4 When the measured value is stable, read and record the FNU
value (secondary measured value).
5 If possible, take a sample at the same time as the turbidity
measurement and, if possible, directly at the measurement
windows.