Hanna Instruments HI8424 - pH Buffer Temperature Dependence

11
• Rinse the temperature probe of a ChecktempC (or ChecktempF) or another
accurate thermometer, and place it close to the pH electrode.
• Use the UP and DOWN arrow keys to manually adjust the temperature to
match the reference thermometer.
• Follow the pH calibration procedure explained in the previous pages.
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 or set temperature.
During calibration the instrument will display the pH buffer value at 25 °C.
pH BUFFER TEMPERATURE DEPENDENCE
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
32
41
50
59
68
77
86
95
104
113
122
131
140
149
158
167
176
185
194
203
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
4.14
4.16
4.17
4.19
4.20
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
7.00
7.01
7.02
7.03
7.04
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
9.74
9.73
9.74
9.75
9.76
TEMP pH VALUES
°C °F 4.01 7.01 10.01