Hach Lange 2100AN, Instrument Manual

Page: 38 / 108

38
SECTION 3,
continued
Note: Install each cell with the orientation mark aligned with the cell holder reference mark
when using matched vials.
Table 2 Formazin Standard Preparation
Standard Step 1 Step 2 Step 3
20 NTU
Add 100 mL of dilution water to a
clean 200-mL class A volumetric
flask
With a TenSette
®
* Pipet, add 1.00
mL of well-mixed 4000-NTU
Formazin stock solution to the
200-mL flask. Dilute to the mark with dilution water.
Stopper and mix.
200 NTU
Add 50 mL of dilution water to a
clean 100-mL class A volumetric
flask With a TenSette* Pipet, add 5.00 mL
of well-mixed 4000-NTU Formazin
stock solution to the 100-mL flask.
Dilute to the mark with dilution water.
Stopper and mix.
1000 NTU
Add 50 mL of dilution water to a
clean 100-mL class A volumetric
flask
With a TenSette* Pipet, add 25.00
mL of well-mixed 4000-NTU
Formazin stock solution to the
100-mL flask.
Dilute to the mark with dilution water.
Stopper and mix.
4000 NTU
Transfer approximately 30 mL of well
mixed 4000-NTU Formazin stock
solution to a clean sample cell. No
dilution is required.
7500 NTU
Ampule
Use in the sealed ampule as
provided. DO NOT open the vial or
use its contents as dilution stock.
* Class A volumetric pipets can be used in place of a TenSette Pipet.