Hach 2100N Instruction Manual page 30

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SECTION 2,
continued
Figure 6 Sample Filtering
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After dilution and measurement, calculate the actual result as follows:
1. Calculate the dilution factor:
Total Volume
Dilution Factor
= ----------------------------------------- -
Sample Volume
Where total volume = sample + dilution water
Example: 20 mL of sample + 80 mL of dilution water = 100 mL total
100
Dilution Factor = --------- -
20
2. Calculate the Final Turbidity Value:
×
Measured Results Dilution Factor
For example, if the measured turbidity value is 1100 NTU, the final turbidity value is
calculated as:
×
1100 5 5500
=
30
= 5
= Actual NTU