47
pH VALUES AT VARIOUS TEMPERATURES
Temperature has a significant effect on pH. The calibration
buffer solutions are effected by temperature changes to a
lesser degree than normal solutions.
For manual temperature calibration please refer to the
following chart:
For instance, if the buffer temperature is 25 °C, the display
should show pH4.01, 7.01 or 10.01 at pH4, 7 or 10 buf-
fers, respectively.
At 20 °C, the display should show pH4.00, 7.03 or 10.06.
The meter reading at 50 °C will then be 4.06, 6.98 or 9.82.
TEMP.
pH VALUES
˚C
˚F
4.01
7.01
10.01
0
32
4.01
7.13
10.32
5
41
4.00
7.10
10.24
10
50
4.00
7.07
10.18
15
59
4.00
7.04
10.12
20
68
4.00
7.03
10.06
25
77
4.01
7.01
10.01
30
86
4.02
7.00
9.96
35
95
4.03
6.99
9.92
40
104
4.04
6.98
9.88
45
113
4.05
6.98
9.85
50
122
4.06
6.98
9.82
55
131
4.07
6.98
9.79
60
140
4.09
6.98
9.77
65
149
4.11
6.99
9.76
70
158
4.12
6.99
9.75
