6
AW T4 20 |
U N I V ER S A L 4 - W I R E , D UA L- I N P U T T R A N SM I T T ER | C I/AW T4 2 0 - EN R E V. 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
corresponding slot on the transmitter backboard – see
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
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.
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.
1
2
3
4
5
6
7
8
G
LA
SS
GU
AR
D
REFERENCE
SO
LU
TION EA
RT
H
PT
PT
SCREEN
PT (3
rd
)
1
2
3
4
5
6
7
8
G
LA
SS
GU
AR
D
REFERENCE
SO
LU
TION EA
RT
H
PT
PT
SCREEN
PT (3
rd
)
ANALOG
OUTPUT
pH INPUT
pH INPUT
Display
Keypad
Transmitter
door lock
Sensor modules
SD card
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
–10 °C
(–14 °F)
min.
55 °C
(131 °F)
max.
