Transmitter 9135 - pH/redox measurement
Page 32
CALIBRATION menu
pH calibration
In calibration mode, the temperature compensation
of the electrodes occurs systematically in the
temperature compensation mode according to the
Nernst law. The temperature measurement remains
active. If the automatic temperature compens ation is
selected, immerse the Pt100/1000 in the calibration
solution.
Buffer solutions
The pH of buffer solutions depends on temperature ;
the nominal pH values are referred to a temperature
of 20
°
C. For temperatures different from 20°C, NIST
standard buffer solutions, DIN buffers, and pH
values are indicated in the table below :
NIST
Delay
Buffer 4,00 Buffer 6,88 Buffer 9,00
0
4,01
6,984
9,464
5
4
6,951
9,395
10
4
6,923
9,332
15
4
6,9
9,276
20
4
6,881
9,225
25
4,01
6,865
9,18
30
4,01
6,853
9,139
35
4,02
6,844
9,102
40
4,03
6,838
9,068
45
4,04
6,834
9,038
50
4,06
6,833
9,01
55
6,833
8,985
60
6,836
8,962
65
6,84
8,941
70
6,845
8,921
75
6,852
8,902
80
6,859
8,884
85
6,867
8,867
90
6,876
8,85
95
6,886
8,833
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