25
5.6.1 SENTRON buffer set
The default buffer set for which the meter is configured is the SENTRON buffer set.
The Sentron buffer set consists of a set of five NIST-traceable buffers with a pH of 2.00, 4.00, 7.00,
10.00 and 12.00 at 25°C. The table containing the temperature dependence of the buffer set is
presented in Table 1 below.
°C
°F
#1
#2
#3
#4
#5
5
41
2.01
4.00
7.10
10.22
12.70
15
59
2.01
4.00
7.04
10.14
12.38
25
77
2.00
4.00
7.00
10.00
12.00
35
95
2.00
4.02
6.98
9.91
11.63
45
113
2.00
4.04
6.96
9.81
11.38
55
131
2.00
4.07
6.96
9.76
11.12
65
149
2.00
4.10
6.95
9.71
10.86
75
167
2.00
4.12
6.94
9.66
10.60
85
185
2.00
4.15
6.93
9.61
10.34
95
203
2.00
4.17
6.92
9.56
10.08
Table 1: SENTRON Buffer set
Note that since the SENTRON buffer set is based on the NIST standard, they are available from other
manufacturers as well.
5.6.2 DIN buffer set
The table containing the temperature dependence of the DIN buffer set as it is used in the SI meter is
presented in Table 2 below.
°C
°F
#1
#2
#3
#4
#5
5
41
3.12
4.67
6.87
9.43
13.57
15
59
3.08
4.65
6.82
9.32
13.17
25
77
3.06
4.65
6.79
9.23
12.75
35
95
3.04
4.65
6.77
9.14
12.45
45
113
3.04
4.67
6.76
9.05
12.14
55
131
3.04
4.69
6.76
8.96
11.83
65
149
3.03
4.71
6.75
8.87
11.52
75
167
3.02
4.73
6.75
8.78
11.21
85
185
3.01
4.75
6.74
8.69
10.90
95
203
3.00
4.77
6.74
8.60
10.59
Table 2: DIN Buffer set
