User Guide

22
ON
HI 7007
4 cm
(1½
")
PROCEDURE FOR HI 931410
HI 931410 provides three technical pre-pro-
grammed calibration buffers: t1, t2, t3
i.e. pH 7.01, 4.01, 10.01 respectively.
When the ATC probe is not used, make sure the
temperature is set manually to reflect the tem-
perature of the solution (see page 26).
• Switch the instrument on after
connecting the pH electrode
and the temperature probe.
ONE POINT CALIBRATION
• Immerse the pH electrode and
the temperature probe into a
pH 7.01 buffer solution.
Shake briefly and wait 1-2 min-
utes for thermal equilibrium.
Note: the electrode should be
submerged approximately
4 cm (1½") into the solution.
The temperature probe should
be located as close as pos-
sible to the pH electrode.
• Press the CAL key. The symbol "t1" will
appear on the display.
• Press the CON key. The buffer value will be
displayed on the right LCD.
Note: the "pH" symbol will be flashing through-
out the calibration procedure.
CAL
CON
pH