Hach 2100P Instrument And Procedure Manual page 50

SECTION 3,
READ
4.
Press: .
READ
The instrument will
count from 60 to 0
(67 to 0 if signal average
is on), measure the blank
and use it to calculate a
correction factor for the
lowest standard. If the
dilution water is
≥0.5 NTU, E 1
will appear (see
Section 3.6.2.3 on
page 41 for more dilution
water information).
The display will
automatically increment
to the next standard.
Remove the sample
cell from the cell
compartment.
continued
5.
Thoroughly mix the
10 to 30 NTU range
standard, then fill a clean
sample cell to the line
with the standard. Insert
the sample cell into the
cell compartment
6.
show the S1 icon (with
the 1 flashing) and
20 NTU or the value of
the S1 standard for the
previous calibration.
50
CAL
NTU
The display will