Hach 2100P ISO Manual page 26

SECTION 2,
1.
Attach the syringe
to the 3-way valve by
gently twisting the
square end into the
syringe tip. Attach the
connector, tubing and a
0.2 micron filter (clear
part faces syringe) as
shown. Be sure the
connections are tight.
2.4.2.4 Preparing Formazin Dilutions (Factory recommended)
Use 20, 100, and 800 FNU formazin standards for calibrating the
2100P ISO Turbidimeter. Dilutions with other FNU values can be
prepared and used (see
when using alternate solutions, use the dilutions specified here.
Prepare all formazin dilutions immediately before use and discard after
calibration. The 4000 FNU solution is stable for up to a year, but
dilutions deteriorate more rapidly. Use the same high quality water
(turbidity <0.5 FNU) for the dilutions and the blank.
continued
2.
Fill a beaker or
container with the water
to be filtered. Insert the
tubing into the container.
Slowly draw the 50 mL
of water into the syringe
by pulling up on the
syringe plunger.
Section 2.4.3.1 on page
3.
plunger to force the
water through the filter
and into a graduated
cylinder or volumetric
flask. Repeat Steps 1–3
until the desired amount
of water is obtained.
Note: As the filter clogs, it
gets more difficult to push
water through it. Discard the
filter and attach a new filter.
30). If problems occur
26
Slowly push on the