17
CFM
Note: The electrode should be submerged
approximately 4 cm (1½") into the
solution. With the temperature probe
located as close to it as possible (
HIHI
HIHI
HI
9023C9023C
9023C9023C
9023C).
• Press the CAL key. The temperature compensated pH value will
blink on the display. For example, if the temperature is 25C the
reading will be pH 7.01. If the temperature is 20C the reading
will be 7.03. The pH/temperature con-
version chart is on page 24.
Note: If "E4" flashes, the buffer solution is
wrong or the probe is defective (see page 25 for trouble-
shooting).
• Wait for the "pH" symbol to stop flashing and press the CFM
key. The symbol "E5" will flash to indicate that the electrode is
still in the pH 7.01 buffer.
• Rinse the pH electrode (and the tem-
perature probe) with distilled water first
and with the pH 4.01 (or 10.01) buffer
after.
• Dip the electrode (and the temperature
probe) into the pH 4.01 (or 10.01) buffer solution. Stir gently
and wait for the reading to stabilize.
• The "E5" symbol should disappear and the temperature com-
pensated value will blink on the display.
For example, if you are using pH 4.01 as
the buffer, the reading will be 4.01 at
25C.
• When the "pH" symbol stops flashing,
press CFM to confirm the calibration.
The instrument is now calibrated and will remain calibrated even
CAL
HI 7004
CFM
4 cm
(1½
")
18
°C
°C
or
°C
HI 7007
RANGE
ON/OFF
when it is turned off.
Note: The meter will lose the calibration if
the batteries are removed.
HI 9023C only:
To calibrate with manual temperature com-
pensation, follow this procedure:
• Disconnect the temperature probe and
switch the instrument ON.
• Press RANGE to select the temperature
mode.
• Place the pH electrode into the 7.01 buffer
stir gently and wait for the LCD to stabilize.
• Record the buffer temperature by using a Checktemp C or an
accurate thermometer (e.g. 18C).
• Press the UP and DOWN to adjust the temperature accordingly.
• Press RANGE to display pH and then press the CAL key. The
value of the buffer will be displayed.
• Wait for the "pH" symbol to stop flash-
ing.
• Press CFM. The "E5" symbol will flash
to indicate that the electrode is still in
the 7.01 solution.
RANGE
CAL
and then
°C
CFM
HI 7004
