User Guide

23
• Allow 1-2 minutes for the pH reading to stabi-
lize.
The pH reading will be temperature compen-
sated.
E.g. if the buffer temperature is at 25°C, the
right display will show "pH 7.01". If the buffer
temperature is at 20°C, the display will show
"pH 7.03" (see page 26).
If "Err4" appears the cali-
bration solution is wrong.
Repeat the process using
fresh buffers
Note: If you are not using the ATC probe,
refer to page 26 to manually correct for
temperature.
• Press the CON key again to ac-
cept the buffer value. The first
point calibration is now complete.
• If the pH/mV key is pressed at
this point, the calibration process
is ended and only the offset of the
meter is calibrated. This is known
as one point calibration.
For greatest accuracy, however, it is recom-
mended that a two-point calibration is per-
formed.
TWO POINT CALIBRATION
• Proceed as described in “One point calibration”
but do not quit calibration by pressing the
pH/mV key at the end.
• After the first calibration point
is confirmed, immerse the pH
electrode and the temperature
probe into the second buffer
solution (pH 4.01 or pH 10.01)
and shake briefly.
CON
pHpH
mVmV
HI 7004
pH
°C