Configuration
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DirectLine® DL423 Sensor Module User Manual
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3. Configuration
3.1 Overview
Configuration Parameters
Set Up consists of configuring the following functions:
Cell Constant Selection
–
Only used with DL4000 conductivity cells.
4973/4905 style cells have an EEPROM that automatically loads the cell
constant information into the DL423 module. The available selections are:
0.01, 0.1 (default), 1, 10, 25, 50.
PV Type Selection
– The PV type determines the measured, displayed, and
transmitted variable. The cell constant determines the available selection of PV
types according to the table below:
Cell Constant
Selectable PV Types
0.01, 0.1
Conductivity
S (default), Resistivity, TDS ppb, TDS ppm
1, 10
Conductivity mS (default), TDS ppt
25, 50
Conductivity mS, Concentration (default)
Cell Factor Selection -
The Cell Factor is a correction value applied to the
Cell Constant to take into account tolerances in manufacturing.
The value for all
DL4000 cells is 1.0
.
Cell styles 4973/4905 have an EEPROM that automatically
loads the cell factor information into the DL423 module. Values between 0.850
and 1.150 can be configured (1.000 default).
TDS Factor Selection –
The TDS Factor is a conversion value applied to
conductivity to calculate the Total Dissolved Solids in units of concentration
(ppm, ppb, or ppt) per
S/cm. This configuration menu is only available when
the PV Type selection is TDS. Values between 0.010 and 1.999 can be
configured (0.500 default).
Solution Temperature Coefficient
– Conductivity and resistivity
measurements can be compensated to 25° C for a specific solution type. The
cell constant determines the available selection of solution types according to
the table below:
Cell Constant
Selectable Solution Types
0.01, 0.1
None (Conductivity/Resistivity only), HCl, NaCl (default)
1, 10
None (Conductivity only), HCl, NaCl (default)
25, 50
None (Conductivity only), HCl(default), NaCl, H2SO4, NaOH