Hanna Instruments HI 9023 - Manual (Page 9)

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 (HI
HI HI HI HI
9023C 9023C 9023C 9023C 9023C).
• Press the CAL key. The temperature compensated pH value will
blink on the display. For example, if the temperature is 25 C the
reading will be pH 7.01. If the temperature is 20 C 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
25 C.
• 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. 18 C).
• 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