Hach 2100N Basic User Manual page 11

StablCal calibration procedure
1. Remove the filter 2. Clean the lens of the
assembly. Refer to USEPA filter assembly.
Change the filter Refer to
assembly on page 15. assembly
7. Use the oiling cloth 8. Put the vial in the
to apply the oil equally sample cell holder with
to the surface of the the triangle on the vial
vial. Remove the aligned with the
excess oil. Make sure reference mark on the
that the vial is almost sample cell holder.
dry. Close the cover.
3. Hold the tab of the
USEPA filter assembly
Clean the filter so that the arrows point
on page 15. toward the front of the
instrument. Push the
filter assembly fully in
the housing.
9. Push ENTER.
The instrument display
counts down, then
measures the standard.
The next expected
standard (e.g., 20.00) is
shown. The S1 light
turns on.
4. Push CAL. 5. Get the < 0.1 NTU
vial. Clean the vial with
The S0 light turns on.
a soft, lint-free cloth to
The NTU value of the
remove water spots and
dilution water used in
fingerprints. Do not
the last calibration is
invert the vial.
shown on the display.
10. Remove the vial 11. Do steps 5–10 for
from the sample cell the other StablCal vials
holder. (from lowest to highest
NTU standard).
The S0 light turns on
after the last vial is
measured.
6. Apply a small bead
of silicone oil from the
top to the bottom of the
vial.
12. Push CAL.
The instrument saves
the new calibration data
and goes back to
Measurement mode.
English 11