ABB AWT420 User manual
—
ABB MEASUREMENT & ANALYTICS | INFORMATION
AWT420
Universal 4-wire, dual-input transmitter
Hazardous area version
Measurement made easy
Introduction
The AWT420 is a universal 4-wire, 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.
This document provides details for AWT420 (metal)
enclosures for use in hazardous areas.
For information on AWT420 (plastic) enclosures for
use in non-hazardous areas refer to O .
The AWT420 supports both traditional analog and
advanced digital EZLink sensors. For information on
the sensors, including installation, commissioning,
operation and maintenance procedures, refer to the
specific sensor manual.
For more information
Further publications for the AWT420 transmitter
are available for free download from:
www.abb.com/measurement
or by scanning this code:
Links and reference numbers for the transmitter
publications are also shown below:
Search for/click on:
Operating Instruction O
Commissioning Instruction C
HART Communications Supplement
HART-EN
PROFIBUS Communications Supplement
PROFIBUS-EN
Ethernet Communications Supplement
ETHERNET-EN
—
AWT420
Universal 4-wire,
dual-input transmitter
2AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | INF/ANAINST/012-EN REV. A
Contents
1 Health & Safety ..............................3
.................................3
Safety precautions .................................3
Potential safety hazards ............................3
...............3
Safety standards ...................................3
Product symbols ...................................3
Product recycling and disposal
(Europe only)...................................... 4
End-of-life battery disposal ...................4
4
Cleaning .......................................... 4
2 Cyber security .............................. 4
Communication protocol specific..............4
3 Electrical installation ........................5
Earth bonding......................................
Cable entries.......................................
Terminal connections..............................
4 Hazardous area considerations ...............7
Health & Safety.....................................7
Safety precautions............................7
Potential safety hazards ......................7
Safety standards .............................7
Name plate/Certification label ................7
Service and repair ..................................7
Risk of electrostatic discharge ..................... 8
Instruments mounted in a hazardous area. .....8
Hazardous area relevant information ............... 8
IECEx/ATEX ..................................8
Ingress protection classification...............8
Ambient temperature range ...................8
Maximum operating voltage, Um ..............8
............................8
cULus ........................................8
Ingress protection classification...............8
Ambient temperature range ...................8
Maximum operating voltage, Um ..............8
............................8
Hazardous location safety control drawings....8
Output parameters of EZLink sensor...........9
Specific conditions of safe use .................... 9
Electrical installation in hazardous areas ........... 9
IECEx/ATEX gland entries .....................9
cULus installation.............................9
Part numbers for hazardous area (Exe) glands ..9
Power supply connection ..........................
Connection capacity...............................
Connecting the transmitter power supply .....
Fitting the hazardous location EZLink bulkhead
connector .......................................
EZLink HazLoc connector
specification/spares.........................
Removing/refitting a panel-mounted AWT420
..............
Panel-mount kit .............................
AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | INF/ANAINST/012-EN REV. A 3
1 Health & Safety
Document symbols
Symbols that appear in this document are explained below:
DANGER
The signal word ‘DANGER’ indicates an imminent danger.
Failure to observe this information will result in death or
severe injury.
WARNING
The signal word ‘WARNING’ indicates an imminent danger.
Failure to observe this information may result in death or
severe injury.
CAUTION
The signal word ‘CAUTION’ indicates an imminent danger.
Failure to observe this information may result in minor or
moderate injury.
NOTICE
The signal word ‘NOTICE’ indicates potential material
damage.
Note
‘Note’ indicates useful or important information about the
product.
Safety precautions
Be sure to read, understand and follow the instructions
contained within this manual before and during use of the
WARNING
Bodily injury
Installation, operation, maintenance and servicing must be
performed:
• by suitably trained personnel only
• in accordance with the information provided in this
manual
• in accordance with relevant local regulations
Potential safety hazards
AWT420 transmitter – electrical
WARNING
Bodily injury
following points must be observed:
• Up to 240 V AC may be present. Be sure to isolate the
supply before removing the terminal cover.
described in this manual or any relevant Material Safety
Company, together with servicing and spares information.
Safety standards
Product symbols
Symbols that may appear on this product are shown below:
Protective earth (ground) terminal.
Functional earth (ground) terminal.
Alternating current supply only.
This symbol, when noted on a product, indicates a
potential hazard which could cause serious personal
injury and/or death. The user should reference this
instruction manual for operation and/or safety
information.
This symbol, when noted on a product enclosure or
barrier, indicates that a risk of electrical shock and/or
electrocution exists and indicates that only
should open the enclosure or remove the barrier.
insulation.
Recycle separately from general waste under the
WEEE directive.
4AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | INF/ANAINST/012-EN REV. A
…1 Health & Safety
Product recycling and disposal
(Europe only)
ABB is committed to ensuring that the risk of any
environmental damage or pollution caused by any of
its products is minimized as far as possible. The
environmental performance of all those involved in
In conformity with European local and national
above symbol may not be disposed of in European
NOTICE
manufacturer or supplier for instructions on how to return
End-of-life battery disposal
The transmitter contains a small lithium battery (located on the
processor/display board) that must be removed and disposed
of responsibly in accordance with local environmental
regulations.
Information on ROHS Directive 2011/65/EU
(RoHS II)
ABB, Industrial Automation, Measurement &
Analytics, UK, fully supports the objectives of the
ROHS II directive. All in-scope products placed on the
market by IAMA UK on and following the 22nd of July
Cleaning
The complete transmitter can be hosed down if it has been
correctly fitted and all unused cable entry holes are blanked off
and .
Warm water and a mild detergent can be used.
2 Cyber security
This product is designed to be connected to and to
communicate information and data via a digital communication
interface. It is your sole responsibility to provide and
continuously ensure a secure connection between the product
and your network or any other network (as the case may be).
You shall establish and maintain any appropriate measures
(such as but not limited to the application of authentication
measures etc.) to protect the product, the network, its system
and the interface against any kind of security breaches,
unauthorized access, interference, intrusion, leakage and/or
theft of data or information.
ABB Ltd and its affiliates are not liable for damages and/or
losses related to such security breaches, any unauthorized
access, interference, intrusion, leakage and/or theft of data
or information.
Communication protocol specific
The HART protocol is an unsecured protocol, as such the
intended application should be assessed to ensure that these
protocols are suitable before implementation.
The Modbus protocol is an unsecured protocol, as such the
intended application should be assessed to ensure that these
protocols are suitable before implementation.
The PROFIBUS PA protocol is an unsecured protocol, as such
the intended application should be assessed to ensure that
these protocols are suitable before implementation.
the intended application should be assessed to ensure that
these protocols are suitable before implementation.
AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | INF/ANAINST/012-EN REV. A 5
3 Electrical installation
DANGER
Bodily injury
• Before making any connections, the external protective
earth stud must be connected to the local earth bonding
point using suitably sized ground cable.
•
device such as a switch or circuit breaker conforming to
local safety standards must be fitted to the final
installation. It must be fitted in close proximity to the
transmitter, within easy reach of the operator and marked
clearly as the isolation device for the transmitter.
• Remove all power from supply, relay, any powered control
circuits and high common mode voltages before
accessing or making any connections. For the mains
power, use 3-core cable rated 3A and for the relay
the US or the Electrical Code for Canada. The terminals
2).
• All connections to secondary circuits must have insulation
must be no access to live parts, for example, terminals.
Use screened cable for signal inputs and relay
connections. Route signal leads and power cables
separately, preferably in an earthed (grounded) flexible
metal conduit.
USA and Canada only
• Supplied cable glands are an optional extra and provided
communication wiring ONLY. A special cable gland is
supplied with the Ethernet communications option and
should be used only for the Ethernet cable.
• The use of cable glands, cable/flexible cord for
connection of the mains power source to the mains input
and relay contact output terminals is not permitted in the
USA or Canada.
• For connection to mains (the mains input and relay
contact outputs), use only suitably rated field wiring
conduits and fittings.
WARNING
Bodily injury
• If the transmitter is used in a manner not specified by the
be impaired.
• Figure 2,
for fuse details.
• Replacement of the internal battery must be carried out
by an approved technician only.
• The transmitter conforms to Installation Category II of
•
•
interface connectors must be connected to Safety Extra
Low Voltage (SELV) circuits.
Earth bonding
WARNING
Before making any electrical connections:
• The external protective earth stud must be connected to
the local earth bonding point using suitably sized ground
cable. To connect to the protective earth stud, use a
closed M4 cable lug.
• Never connect the protective earth with an end sleeve or
an open cable lug.
Cable entries
A E
B F
C G
D
Figure 1 Cable entries
6AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | INF/ANAINST/012-EN REV. A
…3 Electrical installation
Terminal connections
Figure 2 Electrical connections overview
LN
+–
123456 78910 11 12 13 14 15 16 17 18 LN
Digital I/O
Digital I/O Common
OUT1 +
OUT1 –
OUT2 +
OUT2 –
N/O
N/C
COM
N/O
N/C
COM
N/O
N/C
COM
N/O
N/C
COM
Line
Neutral
12345
OUT3 +
OUT3 –
OUT4 +
GND
OUT4 –
12345678 12345678
Communications Sensor 1Sensor 2
Analog output connections
(see below for communication
module connections)
Analog output/
communications module
PCB slot
refer to separate supplements:
HART COM/AWT420/HART-EN
PROFIBUS COM/AWT420/PROFIBUS-EN
ETHERNET COM/AWT420/ETHERNET-EN
AC
supply DC
supply
Relay connections
Analog
output
connections
I/O
connections
Sensor module
connections
module
locations
Main board
connections:
see below
Main board connections
External protective
earth stud
Internal protective
WARNING
Bodily injury
WARNING
Bodily injury
AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | INF/ANAINST/012-EN REV. A 7
4 Hazardous area considerations
Health & Safety
Safety precautions
Be sure to read, understand and follow the instructions
contained within this manual before and during use of the
WARNING
Serious damage to health/risk to life
The AWT420 transmitter is a certified product suitable for
use in hazardous area locations. Before using this product
refer to the product labeling for details of hazardous area
certification. Maintenance and installation must be carried
out only by the manufacturer, authorized agents or persons
conversant with the construction standards for hazardous
Potential safety hazards
WARNING
Bodily injury
following points must be observed:
• Up to 240 V AC may be present. Be sure to isolate the
supply before removing the terminal cover.
described in this manual or any relevant Material Safety
Company, together with servicing and spares information.
Safety standards
Name plate/Certification label
The following name plate is an example only. The name plate
attached to the transmitter may be different.
Transmitters with cULus approval and ATEX IECEx
(Aluminum Enclosure)
Figure 3 Example of hazardous area name plate
Service and repair
DANGER
The product has no live maintenance facility. The instrument
must be de-energized before any maintenance is
performed.
If the instrument is located in a hazardous area none of the
instrument’s components can be serviced by the user. Only
personnel from ABB, its approved representative(s) or persons
conversant with the construction standards for hazardous area
the system and only components formally approved by the
manufacturer should be used. Any attempt at repairing the
instrument in contravention of these principles could cause
damage to the instrument and corporal injury to the person
carrying out the repair. It renders the warranty null and void and
could compromise the hazardous area certification, correct
working of the instrument, electrical integrity and the CE
compliance of the instrument.
If you have any problems with installation, starting or using the
instrument please contact the company that sold it to you. If
this is not possible, or if the results of this approach are not
satisfactory, please contact the manufacturer’s Customer
Service.
E474414
WARNING – DO NOT OPEN IN AN AREA WHERE
AN EXPLOSIVE ATMOSPHERE MAY BE PRESENT
PROCESS CONTROL EQUIPMENT FOR
USE IN HAZARDOUS LOCATIONS
EZLink channels fitted,
Class I, Div 2, Gps A, B, C, D, T4 providing
non-incendive field wiring outputs for Class I
Div 2 Grps A, B, C, D Hazardous locations
No EZLink channels fitted,
Class I, Div 2, Gps A, B, C, D, T4
-10
C
≤ Ta ≤
+45
C
USA: Installation Drg 3KXA005001U0101
Canada: Installation Drg. 3KXA005001U0201
IECEx ULD 20.0009X
The equipment shall only be used in an
area of at least Pollution Degree 2,
as defined in IEC 60664-1
General Arrangement Drg.3KXA005002U0101
Installation Drg. 3KXA005001U0301
EZLink channels fitted,
II 3(3) G Ex ic ec nC [ic Gc] IIC T4 Gc,
No EZLink channels fitted,
II 3 G Ex ic ec nC IIC T4 Gc,
-10
C ≤ Ta ≤
+45
C, IP66,
DEMKO 20 ATEX 2259X
AVERTISSEMENT – NE PAS OUVRIR DANS UN EMPLACEMENT
OÙ UNE ATMOSPHÈRE EXPLOSIVE PEUT ÊTRE PRÉSENTE
8AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | INF/ANAINST/012-EN REV. A
…4 Hazardous area considerations
Risk of electrostatic discharge
WARNING
Serious damage to health/risk to life
damp cloth and install away from any charging risks.
Instruments mounted in a hazardous area.
be taken to minimize the risk of electrostatic discharge. Use a
damp cloth or similar to clean all surfaces.
The keypad is intended to be operated in normal use, care
should be taken to minimize the risk of electrostatic discharge.
Use rubber gloves or ensure operators have been
electrostatically discharged.
Hazardous area relevant information
NOTICE
The hazardous area designation is displayed on the name
page 7.
IECEx/ATEX
Non-Incendive
For models with EZLink channels:
II 3(3) G Ex ic ec nC [ic Gc] IIC T4 Gc
For models without EZLink channels:
II 3 G Ex ic ec nC IIC T4 Gc
Ingress protection classification
Ambient temperature range
Europe
NOTICE
the wiring practices for the country of installation.
Maximum operating voltage, Um
The maximum operating voltage Um for the AC version is
Dielectric strength
circuits, and between IS circuits and earth.
cULus
Non-Incendive
For models with EZLink channels:
(providing non-incendive field wiring outputs for Class I
For models without EZLink channels:
Ingress protection classification
Ambient temperature range
US
NOTICE
Installation must be in accordance with the National
Electrical Code (NFPA 70).
Canada
NOTICE
Maximum operating voltage, Um
Dielectric strength
circuits, and between IS circuits and earth.
Hazardous location safety control drawings
Click below to download the hazardous location safety
drawings for AWT420 transmitter (or scan the QR codes):
AWT420 Metal transmitter UL US control drawing
AWT420 Metal transmitter UL CAN control drawing
AWT420 Metal transmitter UL ATEX IECEx control drawing
8
AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | INF/ANAINST/012-EN REV. A 9
Output parameters of EZLink sensor
Maximum open-circuit voltage
Maximum short-circuit current
Maximum output power
Maximum inductance
Maximum capacitance
The following table is the permitted combinations of Lo and Co:
Lo (mH)
Co (uF)
Table 1 Permitted combinations of Lo and Co
Specific conditions of safe use
1 The enclosure contains aluminum and is considered to
present a potential risk of ignition by impact or friction. Care
shall be taken into account during installation and use to
prevent impact or friction.
2 For areas subject to explosive gas and/or dust atmospheres
charge and become a source of ignition in applications with
painted surface is relatively free of surface contamination
such as dirt, dust, or oil. Guidance on protection against the
risk of ignition due to electrostatic discharge can be found in
be done in accordance with the manufacturer’s instructions
(see: Risk of electrostatic discharge).
3
may impinge on the enclosure or the window of the
enclosure.
4
5 Transient protection shall be provided that is set at a level
6
7 The EZLink wiring is intrinsically safe and must be installed
and separated from non-IS wiring in accordance with IEC/EN
8 Relay contacts must be limited to 3 A.
Electrical installation in hazardous areas
IECEx/ATEX gland entries
For hazardous area installations, suitable ATEX or IECEx cable
be used to seal the entry holes.
cULus installation
The use of Conduit for the non-I.S. external circuits, or
the NEC (NFPA 70).
Cable gland specification for hazardous area (Exe) applications
• M20 entries
•
•
•
•
•
Part numbers for hazardous area (Exe) glands
Part number
M16
Ethernet
M20 | /₂ in
10 AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | INF/ANAINST/012-EN REV. A
…4 Hazardous area considerations
Power supply connection
WARNING
Bodily injury.
USA and Canada only:
• The use of cable glands, cable/flexible cord for
connection of the mains power source to the mains input
and relay contact output terminals is not permitted.
NOTICE
Electrical installation – ABB recommendations
• Ferrules are fitted to all cables.
•
•
Connection capacity
Connection method Push-in spring method
Conductor cross-section solid
Conductor cross-section flexible
Conductor cross-section AWG/kcmil
Conductor cross-section flexible, with ferrule
without plastic sleeve
Conductor cross-section flexible, with ferrule
with plastic sleeve
Stripping length
Connecting the transmitter power supply
Referring to Figure 4:
1 Using a suitable screwdriver, release door retaining screw
Aand open the transmitter door.
2 Release terminal cover retaining screw Band remove
terminal cover plate C.
3 Fit cable gland Dand secure using nut E.
4 Remove gland cover Fand route mains power supply
cable Gthrough it.
5 Route the cable through cable gland Dand into the
enclosure case.
6 Make connections to the power supply connection
terminals H. Connect earth wire IJ.
7 Tighten gland cover F.
8 Refit terminal cover Cand secure it with retaining screw B.
9 Close the transmitter door and secure with door retaining
screw A.
Figure 4 Connecting the transmitter power supply
A
123456 7 8 12345 6 7 8
GLASS
GUARD
REFERENCE
SOLUTION EA RTH
PT
PT
SCREEN
PT (3 rd)
COMMUNICATIONS Sensor 1
C
B
LN
+ –
D
E
F
G
H
External protective earth stud
version
AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | INF/ANAINST/012-EN REV. A 11
Fitting the hazardous location EZLink bulkhead connector
WARNING
Bodily injury
Up to 240 V AC may be present. Isolate the power supply
before removing the opening the transmitter door.
Referring to :
1 Remove connector block cradle Afrom EZLink module(s)
and retain for connection.
2 Unlock and open transmitter door B.
3 Fit EZLink modules as follows:
if one EZLink module is used, push-fit it into location C
Note. When fitting the cable assembly, the EZLink
entry D.
module into location Cand sensor 2 module into
location E.
Note. When fitting the cable assemblies, the EZLink
entry Dand the EZLink bulkhead connector for sensor 2
passes through cable entry F.
Figure 5 EZLink module positions and EZLink cable entries
Referring to :
4 Pass EZLink bulkhead connector cable Gthrough the
5 Pass thread alignment washer Hover EZLink bulkhead
connector cable G, ensuring alignment tab Ilocates into
case slot.
6 Pass thread back nut Jover EZLink bulkhead connector
cable G.
Figure 6 Preparing EZLink bulkhead connector cable fixings
EZLink HazLoc connector specification/spares
Power consumption (maximum)
Digital sensor connector IP rating
Fixed length cable
Extension cable (options)
Maximum length (including optional extension cable)
EZLink HazLoc module assembly
Part number
B
A
DF
DF
CE
I
J
GG H
Flats
12 AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | INF/ANAINST/012-EN REV. A
…4 Hazardous area considerations
…Fitting the hazardous location EZLink bulkhead connector
Referring to Figure 7:
7 Fit alignment tab Iinto gland plate slot Kinto the casting
slot.
8 Insert EZLink bulkhead connector body Lfully into cable
entry and align the bulkhead connector body using the flats
on the alignment washer (see , item H).
9 Screw back nut Jonto bulkhead connector body and
Figure 7 Securing the EZLink bulkhead connector cable
Referring to Figure 8:
10 Place EZLink cable plug Minto EZLink bulkhead connector
block cradle A.
11 Attach EZLink bulkhead cable bung Oto cable loom and
push bung forward to cover connection plug M.
12 Plug assembled connector block cradle/cable plug/bung
into EZLink module P.
Figure 8 Connecting the EZLink cable assembly
Referring to Figure 7:
13 Push EZLink bulkhead label Qonto bulkhead connector
body R.
14 Fit bulkhead dust cap Sonto bulkhead connector body R.
15
16 Close and lock transmitter door B.
K
I
J
L
Q
R
S
B
I
A
M
O
P
A
AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | INF/ANAINST/012-EN REV. A 13
Removing/refitting a panel-mounted AWT420 transmitter – panel seal requirements
NOTICE
RENEW THE PANEL SEAL AND PANEL FIXINGS if removing
DO NOT RE-USE
EXISTING PARTSPanel-mount kit below for
replacement part number.
Panel-mount kit
Part number
Panel-mount kit,
including fixings,
flanges, clamps
and seal
Referring to Figure 9:
1 Cut the correct sized hole in panel A.
2 Insert the transmitter into the panel cut-out B.
3 Screw one panel clamp anchor screw Cinto the left-hand
bracket D
protrudes from the other side of the bracket and position
one clamp Eover the end of the thread.
NOTICE
rating.
4 Holding assembly Ftogether, position bracket Dinto the
left-hand recess on the rear of the transmitter and secure
with bracket securing screw G. Ensure that the plastic
washer remains in the position fitted.
5 Repeat steps 3 and 4 for the right-hand panel clamp
assembly.
6
Figure 9 Panel-mounting the transmitter
A
B
C
D
E
F
A
G
Gasket
Panel cut-out dimensions (glands not fitted)
73 (2.87)
+0.04
+0.04
30
14 AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | INF/ANAINST/012-EN REV. A
Acknowledgments
• HART is a registered trademark of the FieldComm Group
• Modbus is a registered trademark of Schneider Electric USA Inc.
• PROFIBUS is a registered trademark of PROFIBUS organization.
AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | INF/ANAINST/012-EN REV. A 15
Notes
INF/ANAINST/012-EN Rev. A 03.2021
—
We reserve the right to make technical changes or modify the contents of this document
without prior notice. With regard to purchase orders, the agreed particulars shall prevail.
ABB does not accept any responsibility whatsoever for potential errors or possible lack of
information in this document.
We reserve all rights in this document and in the subject matter and illustrations contained
therein. Any reproduction, disclosure to third parties or utilization of its contents – in
whole or in parts – is forbidden without prior written consent of ABB.
© ABB 2021
—
ABB Limited
Measurement & Analytics
Oldends Lane, Stonehouse
Gloucestershire, GL10 3TA
UK
Tel: +44 (0)1453 826 661
Fax: +44 (0)1453 829 671
Email: instrumen[email protected]om
ABB Inc.
Measurement & Analytics
125 E. County Line Road
Warminster, PA 18974
USA
Tel: +1 215 674 6000
Fax: +1 215 674 7183
abb.com/measurement
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