27
26
• Remove the protective cap from the elec-
trode, rinse the tip of the electrode with
some pH 7.01 solution, then immerse the
pH electrode and temperature probe into
a pH 7.01 buffer solution; stir gently and
wait a couple of minutes for thermal equi-
librium.
Note: the electrode should be submerged ap-
proximately 4 cm (1½") into the solution.
The temperature probe should be lo-
cated close to the pH electrode.
• Press °C to display the temperature of the buffer (e.g. 20°C).
• Press the pH key to read pH values. Stir
gently and wait for a couple of minutes.
• Adjust the STD trimmer (for HI 8314) or OFFSET trimmer (for
HI 8915) on the lower left of the front panel until LCD shows the
pH value at the noted temperature (see the pH versus tempera-
ture chart on page 35).
• Rinse and immerse the pH electrode in
pH 4.01 or pH 10.01 buffer (2
nd
calibra-
tion point) and stir gently.
• Wait a couple of minutes and adjust the SLOPE trimmer on the
lower right of the front panel until the LCD shows the pH value
at the noted temperature.
The pH calibration is now complete.
HI 7007
4 cm
(1
½
")
°C
ºC
pH
HI 7004
OFFSET
pH
SLOPE
pH
mometer), e.g. 20.0°C.
• Set the rotary knob to °C to display the
manual temperature setting.
• Adjust the °C trimmer until the LCD shows the measured tem-
perature.
• Set the rotary knob to pH to display pH
measurement and wait for a couple of
minutes for the reading to stabilize.
• Adjust the AP trimmer with a small screwdriver until the LCD
shows the pH value at the above temperature (see the pH versus
temperature chart on page 35).
• Rinse and immerse the pH electrode in
pH 4.01 or pH 10.01 buffer (2
nd
calibra-
tion point) and stir gently.
• Wait a couple of minutes and adjust the mV/pH trimmer until
the LCD shows the pH value at the noted temperature (see
page 35 for pH versus temperature chart).
The pH calibration is now complete.
PROCEDURE FOR HI 8314 & HI 8915
• Switch the meter on after connecting the
pH electrode and the temperature probe.
OFF
mV
°C
pH
°C
ºC
OFF
mV
°C
pH
A
P
pH
°C
HI 7004
pH
mV/pH
ON
OFF
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