YSI pHotoFlex STD Colorimeter - Manual (Page 42)

Operation pHotoFlex
®
STD
42 ba76122e01 02/2013
4.5.7 Zero adjustment
The zero adjustment, i. e. measuring and storing the absorbance of a
cell filled with water, is necessary after the meter is switched on.
Additionally, we recommend to carry out a zero adjustment if the ambi-
ent temperature has changed.
Only perform the zero adjustment against distilled water in an optically
perfect cell. The zero adjustment must be performed separately for
each cell type.
1 If necessary, press the <M> key several times until the mea-
sured parameter Concentration is selected.
2 Press the <CAL/ZERO> key.
The menu for adjustment measurements opens up.
3 Using <> <> and <START/ENTER>, select and start the
Zero adjust. function.
The menu-guided zero adjustment starts.
Follow the instructions on the display.
Photometry \ Absorbance
0.532
16 mm 610 nm
01.12.11 15:12
Zero adjust.
Measure blank value
Delete blank value
Standard adjustment
Photometry \ Adjustment