Metrohm 840 PC Control 5.0 / Touch Control - Manual (Page 205)

4 Parameters
PC Control / Touch Control
193
4 Parameters
All the parameters for the method commands, from which a list of
commands can be constructed, are explained in this section. How you
can insert an individual command in the list of commands is described
in Section 3.16.2. The way of selecting a command from the list and ed-
iting it is described in Section 3.16.1.
With many numerical inputs you can also enter a special value (e. g.
off) or a result that has previously been calculated (e. g. R1) instead of
a number. With PC Control you can enter the special value with the ar-
row to the right of the input field. The result variables are entered di-
rectly via the PC keyboard. Numerical input for Touch Control is de-
scribed in Section 3.1.4.
Parameters which are available as direct parameters (see Sec-
tion 3.16.5) are marked with (d). For further details about individual
parameters, e. g. the input range and default values, please use the
context-sensitive online help (see Section 3.3.3).
The titration, measuring and calibration commands as well as the
evaluations cannot be carried out with the 846 Dosing Interface be-
cause this device doesn't have a measuring interface.
An overview of the devices and their titration and measurement modes
can be found in the appendix in Section 6.6.
4.1 Titrations
The following titration modes are available:
• Dynamic equivalence point titrations (DET) with dynamic incre-
mental reagent addition for all standard titrations. The volume in-
crements vary as a function of the slope of the curve. An attempt is
made to achieve constant measured value alterations with each re-
agent addition. The optimal volume for dosing is determined from
the measured value alterations of the previous reagent additions.
Measured value acceptance is drift-controlled (equilibrium titration)
or after a waiting period. Equivalence points are evaluated automa-
tically.
U/mV
V/mL
Fig. 4.1: Reagent addition for DET