252 pdos>m, O, s, M, a – Metrohm 746 VA Trace Analyzer User Manual
Page 403
5.7 Program instructions
746 VA Trace Analyzer / 747 VA Stand
5-252
PDOS>M
Page:
O, S
Stand:
M, A
Abbreviation:
PD
Instructions t/s Main parameters Auxiliary parameters
––––––––––––– ––––– ––––––––––––––––––––––––– –––––––––––––––––––––––––
## .. PDOS>M ..... Soln.name ........ Prop.coeff. ........
Prop.subst. ........
Function
Dispense auxiliary solution proportional to the measured evaluation value
EV:
of a substance into the measuring vessel (MEAS).
Parameter
Range; Default value / Meaning
Soln.name
8 characters; -
Name of the auxiliary solution
The entry of a solution name is mandatory when the auxiliary solution
should be added automatically using a 685 Dosimat, a 700 Dosino or
the 695 Autosampler. In this case the solution name
Soln.name
must
be entered in the parameter of the same name on the "SOLUTIONS"
page and assigned a position
Pos.
(see section 5.3.4).
Without entry of a name for
Soln.name
in the
PDOS>M
instruction,
without entry of this name on the "SOLUTIONS" page or without a
position assignment, the auxiliary solution must be dispensed manually
or with the 6.5611.010 Pipetting equipment (the prompt
DOS
"Soln.name" "V.add" > M
then appears during the program run with
the calculated addition volume being displayed for
V.add
in
µ
L).
Prop.subst.
8 characters; -
Name of the reference substance for proportional dispensing
Here, the name of the substance whose evaluation value
EV:
(in A, W or s) is the basis for the proportional dispensing of an auxiliary
solution must be entered. This can be the analyte or one of the 7 other
possible substances.
The name of the substance must be identical to one of the substance
names entered on the "SUBSTANCES/Calibration" page (see section
5.6.3).
Prop.coeff.
0.0010...99999.9; 1
Proportionality coefficient
The proportionality coefficient defines the relation between the meas-
ured mean value of the evaluation value
EV:
and the addition
volume
V.add
:
V.add = EV:
Depending on the unit of the evaluation value
EV:
(nA, nW
or s), the proportionality coefficient has the unit
µ
L/nA,
µ
L/nW or
µ
L/s
giving a calculated standard addition volume
V.add
in
µ
L.
Description
The
PDOS>M
instruction is used for the automatic or manual dispensing
of auxiliary solutions (e.g. supporting electrolyte, reagent solution) into
the measuring vessel (MEAS) on the 747 VA Stand. In contrast to the