User Guide

20
The values will be stored in memory and the
meter will return to the operating mode.
Two point calibration at pH 7.01 and pH 4.01
or pH 10.01 (STANDARD):
• Proceed as described in “One point calibra-
tion at pH 7.01” but do not quit calibration by
pressing the CAL 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.
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.
• Select the second buffer value
on the secondary display by
pressing the
°C
or
°C
key.
• When the “READY” and “CON”
symbols blink on the display
the reading is stable and the
calibration can be confirmed.
• Press the CFM key. If the
reading is not close to the
selected buffer solution,
“WRONG
BUF
2
” and “WRONG ”
will blink alternatively. If the
reading is close to the se-
lected buffer, the slope and
the offset are calibrated.
The values will be stored in memory and the
meter will return to the operating mode.
Note: the meter will automatically skip the
buffer that was used for the first cali-
bration to avoid erroneous calibration.
HI 7004
4 cm
(1½
")
°C
ºC
READY
CON
CFM
WRONG
WRONG
2
BUF