6 AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | CI/AWT420-EN REV. B
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
11 for module locations.
The AWT420 supports both traditional analog and advanced
digital EZLink sensors. The transmitter can be wall-, panel- or
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
messages inform the user of the system status and can be
logged for review. The system status can also be assessed
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
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.
Figure 2 Transmitter location
Sensor installation
Refer to the associated sensor Operating Instructions for
installation procedures.
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
Max. cable distance
transmitter to sensor
(refer to sensor Operating
Instructions)
0 to 95 % RH
non-condensing
Eye-level
location
Ambient temperature
Humidity
Avoid vibration
min.
max.
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