OHAUS ST400 Manuel D'instructions page 26

ST400 & ST400M Portable Meter
6 Appendix
6.1 Table 1 BUFFER GROUP
ST400M automatically corrects for the temperature dependence of the buffer group pH value
given in the following tables.
Buffer group 1 US standard
Temp° C pH1.68 pH4.01 pH7.00 pH10.00
5 1.67
10 1.67
15 1.67
20 1.68
25 1.68
30 1.68
35 1.69
40 1.69
45 1.70
50 1.71
Buffer group 2 Europe standard
Temp° C pH2.00 pH4.01
5 2.02
10 2.01
15 2.00
20 2.00
25 2.00
30 1.99
35 1.99
40 1.98
45 1.98
50 1.98
Buffer group 3 MERCK (Ref. 20° C)
Temp ° C pH 2.00 pH4.00 pH7.00 pH9.00 pH12.00
5 2.01
10 2.01
15 2.00
20 2.00
25 2.00
30 2.00
35 2.00
40 2.00
45 2.00
50 2.00
Buffer group 4 JJG199 (Ref. 25° C)
4.01 7.09
4.00 7.06
4.00 7.04
4.00 7.02
4.01 7.00
4.01 6.99
4.02 6.98
4.03 6.97
4.05 6.97
4.06 6.96
pH7.00
4.01 7.09
4.00 7.06
4.00 7.04
4.00 7.02
4.01 7.00
4.01 6.99
4.02 6.98
4.03 6.97
4.04 6.97
4.06 6.97
4.04 7.07 9.16
4.02 7.05 9.11
4.01 7.02 9.05
4.00 7.00 9.00
4.01 6.98 8.95
4.01 6.98 8.91
4.01 6.96 8.88
4.01 6.95 8.85
4.01 6.95 8.82
4.00 6.95 8.79
10.25
10.18
10.12
10.06
10.01
9.97
9.93
9.89
9.86
9.83
pH9.21 pH11.00
9.45 11.72
9.38 11.54
9.32 11.36
9.26 11.18
9.21 11.00
9.16 10.82
9.11 10.64
9.06 10.46
9.03 10.28
8.99 10.10
12.41
12.26
12.10
12.00
11.88
11.72
11.67
11.54
11.44
11.33
EN-23