17
CFM
Note: The electrode should be submerged ap-
proximately 4 cm (1½") into the solution.
With the temperature probe located as
close to it as possible (
HI 9023CHI 9023C
HI 9023CHI 9023C
HI 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 conversion chart is on page 24.
Note: If "E4" flashes, the buffer solution is
wrong or the probe is defective (see
page 25 for troubleshooting).
• 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 tempera-
ture 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 read-
ing to stabilize.
• The "E5" symbol should disappear and the temperature compen-
sated 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 re-
main calibrated even when it is turned off.
Note: The meter will lose the calibration if the batteries are removed.
CAL
HI 7004
CFM
4 cm
(1½")
24
Temperature has an effect on pH. The calibration buffer solutions are
affected by temperature changes to a lesser degree than normal
solutions.
For manual temperature calibration (standard with HI 9110 and
HI 9210 or optional with HI 9023C, HI 9024C and HI 9025C)
please refer to the following chart.
For instance, if the buffer temperature is 25°C, the display should
show pH 4.01, 7.01 or 10.01 at pH 4, 7 or 10 buffers, respectively.
At 20°C, the display should show pH 4.00, 7.03 or 10.06. The meter
reading at 50°C will then be 4.06, 6.98 or 9.82.
pp
pp
p
H VALUES AT VARIOUSH VALUES AT VARIOUS
H VALUES AT VARIOUSH VALUES AT VARIOUS
H VALUES AT VARIOUS
TEMPERATURESTEMPERATURES
TEMPERATURESTEMPERATURES
TEMPERATURES
TEMP pH VALUES
°C °F 4.01 6.86 7.01 9.18 10.01
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
32
41
50
59
68
77
86
95
104
113
122
131
140
149
158
4.01
4.00
4.00
4.00
4.00
4.01
4.02
4.03
4.04
4.05
4.06
4.07
4.09
4.11
4.12
6.98
6.95
6.92
6.90
6.88
6.86
6.85
6.84
6.84
6.83
6.83
6.84
6.84
6.85
6.85
7.13
7.10
7.07
7.04
7.03
7.01
7.00
6.99
6.98
6.98
6.98
6.98
6.98
6.99
6.99
9.46
9.39
9.33
9.27
9.22
9.18
9.14
9.10
9.07
9.04
9.01
8.99
8.97
8.95
8.93
10.32
10.24
10.18
10.12
10.06
10.01
9.96
9.92
9.88
9.85
9.82
9.79
9.77
9.76
9.75
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