Ph Values At Various Temperatures - Hanna Instruments HI21 Series Instruction Manual

pH VALUES AT VARIOUS TEMPERATURES

56
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:
TEMP.
˚C ˚F
0 32
5 41
10 50
15 59
20 68
25 77
30 86
35 95
40 104
45 113
50 122
55 131
60 140
65 149
70 158
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.
pH VALUES
4.01 7.01
4.01 7.13
4.00 7.10
4.00 7.07
4.00 7.04
4.00 7.03
4.01 7.01
4.02 7.00
4.03 6.99
4.04 6.98
4.05 6.98
4.06 6.98
4.07 6.98
4.09 6.98
4.11 6.99
4.12 6.99
10.01
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