5
I
Measurement
Measuring the High Turbidity Sample
For the high turbidity samples (>
1100 NTU), the solution must be diluted
before measurement. The dilution water can be obtained by filtering
distilled water through a < 0.45 µm filter membrane.
2.1 Repeat steps 1.1 through 1.4 above and record the reading.
2.2 Calculate the true turbidity of the original sample using the
following formula.
T = [T
d
(V
s
+ V
d
)] / V
s
Where:
T
= Ture turbidity of the original sample
T
d
= Measured value
V
s
= Volume of the original sample (ml)
V
d
= Volume of the dilution water (ml)
Total Suspended Solids
Measurement
The TB200 turbidity meter contains a Total Suspended Solids mode
and needs to enter a conversion factor before measurement.
Calculating the TSS Factor
1.
Rinse the filter disk with distilled water to remove any solids that
may remain. Put the filter disk in a watch glass and dry them in
a 104°C (219°F) drying oven for 1 hour.
2.
Remove the filter disk and watch glass and put in a desiccator.
Immediately cover the desiccator. Wait for them decrease to
room temperature.
3.
Weigh the filter disk and watch glass and record the mg value
as B.
4.
Filter the 100 ml of sample through pre-weighed filter disk. Put
the filter disk and watch glass in a 104°C (219°F) drying oven for
1 hour.
5.
Remove the filter disk and watch glass and put in a desiccator.
Immediately cover the desiccator. Wait for them decrease to
room temperature.
6.
Weigh the filter disk and watch glass and record the mg value
as A.
7.
Calculate the TSS value using the formula below.
TSS (mg/L) = (A - B) / 0.1
8.
Fill the vial with the sample.
9.
Repeat turbidity measurement steps
1.1 through 1.5 and record
the NTU value. Calculate the TSS conversion factor using the
formula below.
Factor = NTU / TSS (mg/L)
Setting the TSS Factor
1.
Press and hold the
key to enter the setup menu.
2.
Press the
key to select the
TSS Factor
, press the
Enter
key to
confirm.
3.
Press the
/
key to set the conversion factor, press the
Enter
key to save.
Selecting the TSS Measurement Mode
1.
Press and hold the
key to enter the setup menu.
2.
Press the
key to select the
Measurement Mode
, press the
Enter
key to confirm.
3.
Press the
/
key to select the
mg/L (TSS)
, press the
Enter
key to enter the Total Suspended Solids measurement mode.
