Metrohm 862 Compact Titrosampler - Manual (Page 138)

7.4 pH calibration (CAL) ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
128 ￭￭￭￭￭￭￭￭ 862 Compact Titrosampler
Selection Selection of configured sensors
Stirrer
When this parameter is switched on, then the stirrer is switched on at the
start of the determination.
Selection on | off
Default value on
Stirring rate
Setting the stirring rate. It can be set in steps of –15 to +15. The default
setting 8 corresponds to 1000 U/min. The formula for calculating the rota-
tional speed is specified in chapter 10.2, page 140. The optimum stirring
rate can be tested in the manual control.
The algebraic sign of the stirring rate changes the direction in which the
stirring is done. When the stirrer is viewed from above, this means:
￭ "+": counterclockwise rotation
￭ "–": clockwise rotation
Range –15 ... 15
Default value 8
7.4.2 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.