Electronics Module; Operator Interface; Figure 1-2 Electronics Module - Honeywell DirectLine DL424 User Manual

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 DO value that is measured by the
probe. The transmitted loop current is compensated for process temperature.
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.
The DirectLine ® electronic module for dissolved oxygen measurements is available
in two configurations:

ppm (DL424) and ppb (DL425).

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® DL424/425 Sensor Module User Manual 9/11