18
°C
°C
or
°C
HI 7007
RANGE
ON/OFF
HI 9023C only:
To calibrate with manual temperature compensation, 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 stabi-
lize.
• 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 flashing.
• Press CFM. The "E5" symbol will flash to indicate that the elec-
trode is still in the 7.01 solution.
• Rinse the electrode with clean or distilled
water first and then with pH 4.01 (or
10.01) buffer. Dip the electrode into the
pH 4.01 (or 10.01) solution and stir gen-
tly.
RANGE
CAL
and then
°C
CFM
HI 7004
23
• Rinse first with clean or distilled water
and then with a small amount of the next
buffer (2
nd
calibration point). Dip the elec-
trode into pH 4.01 (or 10.01) buffer, stir
gently and wait until the display has sta-
bilized.
• Adjust the SLOPE trimmer (#4 pages 9-10) until the LCD displays
the pH value at the second buffer temperature (see page 24).
• pH calibration is now complete. Once the calibration process is
complete, replace the trimmer cover and tighten it to ensure a
proper seal against water and humidity ingress.
pH
HI 7004
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