19
• Wait for the "pH" symbol to stop flashing. Press CFM to confirm
the calibration.
PROCEDURE FOR HI 9024C AND HI 9025C:
In order to calibrate HI 9024C and HI 9025C, there is a choice of 5
memorized buffers: 4.01, 6.86, 7.01, 9.18 and 10.01 pH.
• Make sure that the meter is in the pH mode.
• Remove the protective cap and rinse the electrode with some of
the buffer calibration solution that you are going to use first.
ONE-POINT CALIBRATION:
It is always recommended to perform a two-point calibration for
optimum accuracy. In case of necessity, it is possible to carry out only
a one-point calibration with the instruments. The offset buffers, that is
the Standard 7.01 or the NIST 6.86 are the most appropriate for this
purpose even though both meters can be calibrated with any of the 5
memorized calibration solutions.
• Immerse the pH electrode into a pH buffer
solution (e.g. pH 6.86) and stir gently.
Note: The electrode should be submerged
approximately 4 cm (1½") into the so-
lution. With the temperature probe
located as close to it as possible.
• Press the CAL key. The "CAL" and "
BUF
" indicators will be dis-
played. The secondary LCD will display one of the 5 buffers
(e.g."4.01").
• Press the
Ï
°C or Ð
°C°C
°C°C
°C key until the secondary display changes
to the buffer (“6.86”).
CFM
CAL
1
BUF
pH
°C
HI 7006
CAL
4 cm
(1½")
CAL
1
BUF
pH
22
accurate thermometer (e.g.20°C).
• Using the screwdriver, turn the tempera-
ture trimmer (# 5 pages 9-10) to display
the recorded temperature value.
• Press the pH/°C SET key for HI 9110 or the RANGE key for
HI 9210 to read pH.
pH Calibration
All three meters provide for manual pH calibration. As a result, you
can perform one or two point calibration at a buffer of your choice.
The instructions below explain a typical calibration procedure at
pH 7 and then 4 or 10.
• Remove the protective cap from the elec-
trode, rinse it with some pH 7.01 solution,
then dip in pH 7.01 buffer. Stir briefly and
wait for one minute for the reading to
stabilize.
Note: The electrode should be submerged ap-
proximately 4 cm (1½") into the
solution. For HI 9110 and HI 9210,
place the thermometer close to the pH
electrode.
• Adjust the OFFSET trimmer (#3 pages 9-10) until the LCD shows
the pH value at the buffer temperature (see page 24 for pH values
at various temperatures). With HI 9210N, press RANGE to read
the buffer temperature.
°C
°C
pH
°C
SET
RANGE
°C
HI 7007
pH
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