ABB AWT420 - Overview

AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | OI/AWT420-EN REV. B
7
3 Overview
The AWT420 is a universal 4-wire single or dual-input
transmitter suitable for the measurement and control of a wide
range of parameters including pH, ORP, conductivity, turbidity/
suspended solids and dissolved oxygen (depending on the
module[s] fitted).
Sensor and communication modules plug directly into their
page
13 for module locations.
The AWT420 supports both traditional analog and advanced
digital EZLink sensors. The transmitter can be wall-, panel- or
page 8.
Information from the sensor is sent to the transmitter via a
sensor interface board. The process reading is displayed on the
main page and can be displayed as a graph in the Chart View
refer to page 29 for details of view options.

can be logged for review. The system status can also be

or Ethernet communications.
Installation and commissioning is simplified with plug-and-play
digital sensor connections and automatic sensor recognition
and set-up.
Figure 1 AWT420 transmitter – main components
12345 6 7 8
GLASS
GUARD REFERENCE SOLUTION EA RTH
PT PT SCREEN PT (3 rd)
1 2345 6 7 8
GLASS
GUARD REFERENCE SOLUTION EA RTH
PT PT SCREEN PT (3 rd)
ANALOG
OUTPUT
pH INPUTpH INPUT

Keypad
Transmitter
door lock
Sensor modules

holder
Tamper-evident seal
attachment point
Analog output/
communication
modules