21
pH BUFFER TEMPERATURE DEPENDENCE
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.
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
During calibration the instrument will display the pH buffer value at 25 °C.
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