Overview; Mechanical Installation; Transmitter Installation; Optional Accessories - ABB AWT420 Commissioning Instructions

6 AW T4 2 0 | U N I V E R S A L 4 - W I R E , D U A L- I N P U T T R A N S M I T T E R | C I/A W T4 2 0 - E N R E V. B
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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
corresponding slot on the transmitter backboard – see page
11 for module locations.
The AWT420 supports both traditional analog and advanced
digital EZLink sensors. The transmitter can be wall-, panel- or
pipe-mounted – see page 7.
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 23 for details of view options. Diagnostic
messages inform the user of the system status and can be
logged for review. The system status can also be assessed
remotely using optional HART®, MODBUS®, Profibus® or
Ethernet communications.
Installation and commissioning is simplified with plug-and-play
digital sensor connections and automatic sensor recognition
and set-up.
Display
Keypad
SD card Analog output/
holder communication modules
Figure 1 AWT420 transmitter – main components
Transmitter
door lock
Tamper-evident seal
attachment point
Sensor modules
ANALOG pH INPUT pH INPUT
OUTPUT
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8

4 Mechanical installation

Transmitter installation

Optional accessories

Optional installation accessories:
• Cable gland kit
• Weathershield
• Panel-mount kit
• Pipe-mount kit

Location

For general location requirements refer to Figure 2. Select a
location away from strong electrical and magnetic fields. If this
is not possible, particularly in applications where mobile
communications equipment is expected to be used, screened
cables within flexible, earthed metal conduit must be used.
Install in a clean, dry, well ventilated and vibration-free location
providing easy access. Avoid rooms containing corrosive gases
or vapors, for example, chlorination equipment or chlorine gas
cylinders.
Max. cable distance
transmitter to sensor
(refer to sensor Operating
Instructions)
–10 °C
(–14 °F)
min.
Ambient temperature
Avoid vibration
Figure 2 Transmitter location

Sensor installation

Refer to the associated sensor Operating Instructions for
installation procedures.
Eye-level
location
55 °C
0 to 95 % RH
(131 °F)
non-condensing
max.
Humidity