Metrohm 900 Touch Control Manual - Manual (Page 397)

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29 Parameters
900 Touch Control
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Selection constant | ISO / DIN
constant
The temperature compensation is carried out with the value entered
for the temperature coefficient.
ISO / DIN
For ground water, spring water and surface water, the temperature
coefficients according to standard ISO 7888:1985 (German version:
DIN EN 27888:1993) are stored in the system.
Temp. coefficient
This parameter can only be edited with Temp. compensation = con-
stant.
Temperature coefficient belonging to the reference temperature entered
above. With this temperature coefficient, the conductivity is converted to
the reference temperature.
Input range 0.00 - 9.99 %/°C
Default value 0.00 %/°C
29.9.2 Standard addition
Under [Standard addition], the parameters for the concentration mea-
surement by means of standard addition are defined. This button is avail-
able only with the MEAS Conc command (concentration measurement).
Addition
Selection of the addition mode.
Selection off | auto | auto dos | manual
Default value off
off
The concentration measurement is carried out without standard addi-
tion, i.e. as a direct measurement.
auto
The standard solution is dosed automatically. The individual volume
steps are calculated in the way that a certain voltage difference is
reached. This voltage difference (Delta U) is defined under Standard
addition
▶ Dosing device.
auto dos
The standard solution is dosed automatically. The individual volume
steps are defined under Standard addition
▶ Addition increments.
manual
The standard solution is dosed manually. The individual volume steps
are defined under Standard addition
▶ Addition increments.