Metrohm 877 Titrino plus - Manual (Page 106)

7.3 pH calibration (CAL)
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877 Titrino plus
7.3.2 Buffers
Menu ▶ Parameters ▶ Buffers
The buffer type and the number of buffers is defined under Buffers.
Buffer type
Selection of a predefined buffer series or definition of special buffers. In
the case of predefined buffer series, the instrument automatically recogni-
zes which buffer is involved.
Selection Baker | Beckman | DIN | Fisher | Fluka Basel |
Hamilton | Merck CertiPUR | Merck Titrisol |
Metrohm | Mettler | NIST | Precisa | Radiome-
ter | Special
Merck CertiPUR
Reference temperature = 25 °C. The buffer type Merck Titrisol must
be selected when using Merck CertiPUR buffers (20 °C).
Special
Up to five calibration buffers can be defined in the method. The auto-
matic buffer detection is not activated in this case. The buffers must be
measured precisely in the specified sequence.
Number of buffers
Number of buffers that are used for calibration. If calibration is accom-
plished with more than two buffers, then they can be used repeatedly
give them more statistical weight. The first two buffers must however
always be different from one another.
Selection 1 | 2 | 3 | 4 | 5
Default value 2
Buffer 1 pH
This parameter is visible only when Buffer type = Special.
Input range –20.000 - 20.000
Default value 7.000
Buffer 2 pH
This parameter is visible only when Buffer type = Special.
Input range –20.000 - 20.000
Default value 4.000
Selection off
Buffer 3 pH
This parameter is visible only when Buffer type = Special.