Hach 2100P ISO Manual page 54

SECTION 4,
9. Replace the batteries and battery cover.
10. Insert the 800 FNU formazin standard into the sample cell. Press
and hold
READ
software version number disappears from the display (for models
with serial numbers less than 920300000800,
11. Adjust the scattered light amplifier output by inserting a small
flat-blade screwdriver into the trimpot hole (located on bottom).
Adjust the display to read 2.5 ± 0.3 volts (2.0 volts for models that
display
2100
12. Press to exit gain adjust mode.
I/O
13. Perform a formazin calibration according to
page 24 or Section 2.4.2.4 on page
continued
. Then press
I/O
when turned on).
. Release the
READ
Section 2.4.2 on
26.
54
key after the
disappears).
2100