Hach 2100P User Manual

45
SECTION 3, continued
4. Press: READ
The instrument will
count from 60 to 0, (67 to
0 if signal average is on),
read the blank and use it
to calculate a correction
factor for the 20 NTU
standard measurement.
If the dilution water is
≥ 0.5 NTU, E 1
will appear when the
calibration is calculated
(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.
Note: The turbidity of
the dilution water can be
“forced” to zero by pressing
→ rather than reading the
dilution water. The display
will show
S0 NTU and the
↑ key must be pressed to
continue with the next
standard.
5. The display will
show the S1 (with the
1 flashing) and 20 NTU
or the value of the S1
standard for the previous
calibration. If the value is
incorrect, edit the value
by pressing the → key
until the number that
needs editing flashes.
Use the ↑ key to scroll
to the correct number.
After editing, fill a clean
sample cell to the line
with well mixed 20 NTU
StablCal Standard or
20 NTU formazin
standard. Insert the
sample cell into the
cell compartment by
aligning the orientation
mark on the cell with the
mark on the front of the
cell compartment. Close
the lid.
6. Press: READ
The instrument will
count from 60 to 0
(67 to 0 if signal average
is on), measure the
turbidity and store the
value. The display will
automatically increment
to the next standard.
Remove the sample
cell from the cell
compartment.
READ
NTU
CAL
READ

Hach 2100P Specifications

General

Range	0 to 1000 NTU
Light Source	Tungsten filament lamp
Detector	Silicon photodiode
Operating Temperature	0 to 50 °C (32 to 122 °F)
Power	4 AA alkaline batteries
Resolution	0.01 NTU
Measurement Principle	Nephelometric
Display	LCD