Introduction
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DirectLine® DL423 Sensor Module User Manual
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1.3 Operator Interface
The DirectLine® Sensor operator interface consists of three pushbuttons and one 4-
digit, 7-segment LCD display with 3 decimal points, plus (+), and minus (–) signs. It
is responsible for the display of measured values and configuration of parameter
values.
1.4 Specifications
Display Ranges
Conductivity
: 0 to 2000
S/cm, 0 to 20.00 mS/cm,
0 to 1000 mS/cm
Resistivity
: 0 to 20.00 M
-cm
Total Dissolved Solids (TDS)
: 0 to 2000 ppm,
0 to 2000 ppb, 0 to 200ppt
% Concentration
: 0 to 20.00%
Displayed Temperature Range
–10 °C to +140 °C (14 °F to 284 °F)
Display Accuracy
Conductivity/Resistivity
: Greater of +/- 2 counts or
+/- 0.5% of reading
Concentration
: +/- 0.5% of reading
Temperature
: +/- 0.1°C from –10 to 99.9°C,
+/- 1°C from 100 to 140 °C
Display Resolution
4 digits, floating decimal point
Process Temperature
Model 4973/4905
DL4000
–10 °C to +140 °C (14 °F to 284 °F)
0 °C to 65 °C (32 ° F to 149 °F)
Electronics Module Ambient
Temperature
–20 °C to +85 °C (–4 °F to +185 °F)
Output Type
4-20 mA (2-wire loop powered)
Output Calibration
4-20 mA
Cell Constant/Cell Calibration
Factor Input
Automatic from EEPROM in Conductivity Cell (for
4973/4905 type cells only)
Manual input for DL4000 type cells
Output (Loop)
6m (19.7’) cordset or shielded twisted pair with
field wiring connector
Output (Loop) User Termination
Tinned leads