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Introduction
1.2 Electronics Module
The electronics module is loop-powered by 16-42 Vdc and will modulate its supply
current from 4 mA to 20 mA, depending upon the ORP value that is measured by the
Meridian II electrode.
A 4-20 mA output connection is provided via a 6m cordset or a customer supplied
cable used in combination with a field wiring connector.
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.
2
Figure 1-2 Electronics Module
DirectLine® DL422 Sensor Module User Manual
1/03
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