Metrohm 827 pH lab - Manual (Page 39)

6 Methods / Parameters
826/827 pH meter, Instructions for Use
31
no.of buffers 1...2...3
Up to 3 buffers can be used for the pH calibration. If the calibration is
carried out with only one buffer then the program will use the theoretical
value of 100.0 % for the slope. This also applies when a calibration with
several buffers is canceled with after the first buffer has been
measured and then confirmed with .
Enter "3" if you carry out a 2-point calibration but wish to measure the
second buffer twice in order to give it more statistical weight.
buff.type: Metrohm, NIST, DIN, Fisher,
Fluka BS, Mettler, MerckTitrisol,
MerckCertiPUR, Beckman, Radiome-
ter, Baker, Hamilton, Precisa,
special
For the automatic temperature-specific buffer recognition during the ca-
libration, information about the type of buffer used is required. In the pH
meter the temperature-dependent pH values of reference buffer solu-
tions and technical buffer solutions from some suppliers are stored.
Such a buffer table for Metrohm buffers looks like this:
Metrohm buffers
T [°C] pH 4.00 pH 7.00 pH 9.00
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
3.99
3.99
3.99
3.99
3.99
4.00
4.00
4.01
4.02
4.03
4.04
4.06
4.07
4.09
4.11
4.13
4.15
4.18
4.20
4.23
7.11
7.08
7.06
7.04
7.02
7.00
6.99
6.98
6.98
6.97
6.97
6.97
6.97
6.98
6.98
6.99
7.00
7.00
7.01
7.02
9.27
9.18
9.13
9.08
9.04
9.00
8.96
8.93
8.90
8.87
8.84
8.81
8.79
8.76
8.74
8.73
8.71
8.70
8.68
8.67