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The temperature has an effect on pH. The calibration buffer solutions are affected by temperature
changes to a lesser degree than normal solutions.
During calibration the instrument will automatically calibrate to the pH value corresponding to the
measured temperature.
During calibration the instrument will display the pH buffer value at 25 °C.
TEMP
pH BUFFERS
°C
°F 1.68 4.01 6.86 7.01 9.18 10.01 12.45
0
32 1.67 4.01 6.98 7.13 9.46 10.32 10.38
5
41 1.67 4.00 6.95 7.10 9.39 10.25 13.18
10
50 1.67 4.00 6.92 7.07 9.33 10.18 12.99
15
59 1.67 4.00 6.90 7.05 9.27 10.12 12.80
20
68 1.68 4.00 6.88 7.03 9.22 10.06 12.62
25
77 1.68 4.01 6.86 7.01 9.18 10.01 12.45
30
86 1.68 4.02 6.85 7.00 9.14 9.96 12.29
35
95 1.69 4.03 6.84 6.99 9.11 9.92 12.13
40 104 1.69 4.04 6.84 6.98 9.07 9.88 11.98
45 113 1.70 4.05 6.83 6.98 9.04 9.85 11.83
50 122 1.71 4.06 6.83 6.98 9.01 9.82 11.70
55 131 1.72 4.08 6.84 6.98 8.99 9.79 11.57
60 140 1.72 4.09 6.84 6.98 8.97 9.77 11.44
65 149 1.73 4.11 6.84 6.99 8.95 9.76 11.32
70 158 1.74 4.12 6.85 6.99 8.93 9.75 11.21
75 167 1.76 4.14 6.86 7.00 8.91 9.74 11.10
80 176 1.77 4.16 6.87 7.01 8.89 9.74 11.00
85 185 1.78 4.17 6.87 7.02 8.87 9.74 10.91
90 194 1.79 4.19 6.88 7.03 8.85 9.75 10.82
95 203 1.81 4.20 6.89 7.04 8.83 9.76 10.73
21
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