YSI pHotoFlex pH Handheld Colorimeter - Manual (Page 44)

Operation pHotoFlex
®
pH
44 ba76123e01 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 Press the <M> key (long pressure) repeatedly until the Pho-
tometry measuring mode is selected.
2 Press the <M> key (short pressure) repeatedly until the mea-
sured variable, Concentration is selected.
3 Press the <CAL/ZERO> key.
The menu for adjustment measurements opens up.
4 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
01.02.05 15:12
Zero adjust.
Measure blank value
Delete blank value
Photometry \ Adjustment