This guide provides basic guidelines for the Emerson Wireless Field Link. It does not provide
instructions for diagnostics, maintenance, service, or troubleshooting. This guide is also available
electronically on www.Emerson.com.
WARNING
Failure to follow these installation guidelines could result in death or serious injury.
Ensure only qualified personnel perform the installation.
Explosions could result in death or serious injury.
Installation of the transmitters in a hazardous environment must be in accordance with the
appropriate local, national, and international standards, codes, and practices. Please review the
Product Certifications section for any restrictions associated with a safe installation.
Electrical shock could cause death or serious injury.
Avoid contact with the leads and terminals. High voltage that may be present on leads can cause
electrical shock.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following
conditions:
This device may not cause harmful interference.
This device must accept any interference received, including interference that may cause undesired
operation.
This device must be installed to ensure a minimum antenna separation distance of 8-in. (20 cm) from
all persons.
The Emerson Wireless Field Link and wireless I/O should be installed and
functioning properly before the power modules are installed in any wireless
field devices. Wireless field devices should also be powered up in order of
proximity from the Field Link beginning with the closest. This will result in a
simpler and faster network installation.
1.2Mounting location
The Field Link should be mounted in a location that allows convenient access
to the host system network (wireless I/O) as well as the wireless field device
network.
Find a location where the Field Link has optimal wireless performance.
Ideally this will be 15 to 25 ft. (4,6 to 7,6 m) above the ground or 6 ft. (2 m)
above obstructions or major infrastructure.
Figure 1-1: Mounting Location
A
Control room
B
Ground
C
Field link
1.3Antenna position
The antenna should be positioned vertically, either straight up or straight
down, and should be approximately 3 ft. (1 m) from any large structure,
Quick Start Guide3
D
E
Mast or pipe
Infrastructure
A
A
Quick Start GuideSeptember 2020
building, or conductive surface to allow for clear communication to other
devices.
Figure 1-2: Antenna Position
1.4Conduit plug
The temporary orange plugs should be replaced with the included conduit
plugs using approved thread sealant.
Figure 1-3: Conduit Plugs
A
Conduit plug
1.5Intended use
The Field Link must be used in conjunction with a network manager or
network Gateway. The Field Link then functions as a translator between the
wired network and a wireless field network.
4Emerson.com/Rosemount
A
B
C
D
E
F
September 2020Quick Start Guide
Figure 1-4: Example System Architecture
A
Host system
B
Control network
C
Network manager
D
Field link
E
Wireless field network
F
Wireless field devices
Quick Start Guide5
Quick Start GuideSeptember 2020
2Physical installation
2.1Pipe mounting
Procedure
1. Insert larger U-bolt around 2-in. pipe/mast, through the saddle,
through the L-shaped bracket, and through the washer plate.
2. Use a 1/2-in. socket-head wrench to fasten the nuts to the U-bolt.
3. Insert smaller U-bolt around base the Field Link and through the Lshaped bracket.
4. Use a 1/2-in. socket-head wrench to fasten the nuts to the U-bolt.
2. Connect the positive power lead to the “+” power terminal and the
negative power lead to the “–” terminal.
3. Connect the Data + lead to the “A (+)” terminal and the Data – lead
to the “B (–)” terminal.
4. Plug and seal any unused conduit connections.
5. Replace the housing cover.
6Emerson.com/Rosemount
A
B
C
D
September 2020Quick Start Guide
Figure 2-2: Emerson Wireless Field Link Terminal Diagram
AData A (+)
BData B (–)
C+10.5 to 30 VDC
DReturn
2.3Grounding
The Field Link enclosure should always be grounded in accordance with
national and local electrical codes. The most effective grounding method is a
direct connection to earth ground with minimal impedance. Ground the
Field Link by connecting the external ground lug to earth ground. The
connection should be 1 Ω or less.
Quick Start Guide7
Quick Start GuideSeptember 2020
3Verify operation
3.1Power-up sequence
Upon applying power to the Field link the LCD display meter will activate and
display a series of startup screen. The following screens are displayed during
startup.
1. Startup Screen 1 – All segments on
2. Startup Screen 2 – Device identification
3. Startup Screen 3 – Tag
4. Startup Screen 4 – Status
3.2Normal operation
After the initial startup screens the Field Link will cycle through several
periodic screens.
1. Electronics Temperature Screen
2. Percent Range Screen
3. Wired Interface Usage
4. Radio Interface Usage
The Field Link will continue to rotate through each periodic screen through
the course of normal operation. If any diagnostic or fault condition occurs, a
corresponding diagnostics screen will appear.
8Emerson.com/Rosemount
A
B
C
D
September 2020Quick Start Guide
4Reference information
Figure 4-1: Emerson Wireless Field Link Terminal Diagram
A
B
C
D
Data A (+)
Data B (–)
+10.5 to 30 VDC
Return
Note
The Emerson Wireless Field Link requires separate twisted shield pairs (four
wires) for power and data.
Quick Start Guide9
A
B
C
D
90°
5.51
(140)
4.20
(107)
3.55
(90.17)
10.91
(277)
12.43
(316)
3.55
(90.17)
5.51
(140)
5.21
(132)
Quick Start GuideSeptember 2020
Figure 4-2: Emerson Wireless Field Link Dimensional Drawing
A
2x Conduit plug
B
Possible antenna rotation shown
C
Extended range antenna
D
WirelessHART® antenna
Table 4-1: Emerson Wireless Field Link Specifications
MountingAll SST, 2-in. pipe and panel mount bracket
Humidity0 – 90% relative humidity
(1) Ambient temperatures above 60 °C require wiring rated to at least 5 °C above
10Emerson.com/Rosemount
max ambient temperature.
24 AWG - 14 AWG twisted shielded pair
Less than 15 pF/ft capacitance.
10 dBm with WK antenna and 12.5 dBm with WM
antenna
(1)
(1)
September 2020Quick Start Guide
5Ordering information
Table 5-1: Emerson Wireless Field Link
The Standard offering represents the most common options. The starred options (★)
should be selected for best delivery. The expanded offering is subject to additional
delivery lead time.
ModelProduct description
781Emerson Wireless Field Link
Physical connection
A1RS485★
Housing
DDual compartment housing - aluminum★
EDual compartment housing - stainless steel★
Conduit threads
11/2 – 14 NPT★
2M20★
Product certifications
I5USA Intrinsically Safe, Non-incendive★
I6Canada Intrinsically Safe★
I1ATEX Intrinsic Safety★
I7IECEx Intrinsic Safety★
KDUSA and Canada Intrinsically Safe, ATEX and IECEx Intrinsic Safety★
I2INMETRO, Intrinsic Safety★
I4Japan Intrinsic Safety★
IMEAC Intrinsic Safety★
I3China (NEPSI) Intrinsic Safety★
KLUSA and Canada Intrinsic Safety, ATEX Intrinsic Safety★
NANo Approvals★
Wireless update rate, operating frequency and protocol
WA3WirelessHART★
Omnidirectional wireless antenna and SmartPower
WK3External antenna, line power 10 – 30 VDC★
WM3Extended range, external antenna, line power 10 – 30 VDC★
™
Quick Start Guide11
Quick Start GuideSeptember 2020
Table 5-1: Emerson Wireless Field Link (continued)
Options (Include with selected model number)
Meter
M5LCD display★
Gland and connector options
G2Cable gland (7,5 – 11,9 mm)
G4Thin wire cable gland (3 – 8 mm)
Typical model number: 781 A1 D 1 KL WA3 WK3 M5
12Emerson.com/Rosemount
September 2020Quick Start Guide
6Product certifications
Rev 1.2
6.1European Directive Information
A copy of the EU Declaration of Conformity can be found at the end of the
Quick Start Guide. The most recent revision of the EU Declaration of
Conformity can be found at Emerson.com.
6.2Ordinary Location Certification
As standard, the transmitter has been examined and tested to determine
that the design meets the basic electrical, mechanical, and fire protection
requirements by a nationally recognized test laboratory (NRTL) as accredited
by the Federal Occupational Safety and Health Administration (OSHA).
6.3Installing in North America
The US National Electrical Code® (NEC) and the Canadian Electrical Code
(CEC) permit the use of Division marked equipment in Zones and Zone
marked equipment in Divisions. The markings must be suitable for the area
classification, gas, and temperature class. This information is clearly defined
in the respective codes.
6.4USA
I5 USA Intrinsically Safe (IS), Nonincendive (NI) and Dust-ignitionproof
Certificate
Standards
Markings
Input parameters
(power terminals)
V
MAX/Ui
I
MAX/Ii
P
MAX/Pi
Ci = 10 nFCi = 5 nFCa/Co = 13.49nF
Quick Start Guide13
FM 17US0235X
FM Class 3600:2011, FM Class 3610:2010, FM Class
3611:2004, FM Class 3810:2005, ANSI/ISA 60079 – 0:2009,
ANSI/UL 60079 – 11:2009, ANSI/ISA 61010 – 1:2004, ANSI/
NEMA 250:2003, ANSI/IEC 60529:2004;
IS CL I, DIV 1, GP A, B, C, D; CL II, DIV 1, GP E, F, G; Class III T4;
Class 1, Zone 0 AEx ia IIC T4; NI CL I, DIV 2, GP A, B, C, D T4; DIP
CL II, DIV 1, GP E, F, G; CL III T4; when installed per drawing
00781-1010 T4(–40 °C ≤ Ta ≤ +70 °C)
= 30 VV
= 200 mAI
= 1 WP
Input parameters
(sensor terminals)
= 11 VVoc/Uo = 7.14 V
MAX/Ui
= 300 mAIsc/Io = 112 mA
MAX/Ii
= 1 WP
MAX/Pi
Output parameters
(sensor terminals)
= 640 mW
MAX/Po
Quick Start GuideSeptember 2020
Input parameters
(power terminals)
Li = 3.3 μHLi = 2.2 μHLa/Lo= 2 mH
Special Conditions for Safe Use (X)
1. The Rosemount 781 transmitter housing contains aluminum and is
considered a potential risk of ignition by impact or friction. Care must
be taken into account during installation and use to prevent impact
and friction.
2. The surface resistivity of the unit is greater than 1 gigaohm. To avoid
electrostatic charge buildup, it must not be rubbed or cleaned with
solvents or a dry cloth.
3. The Rosemount 781 transmitter will not pass the 500 Vrms electric
strength test and this must be taken into account during installation.
Intrinsically Safe Class I, Division 1, Groups A, B, C, and D T3C
(Ta ≤ +60 °C) Type 4X; IP 66/67; when installed per
00781-1011
6.6Europe
I1 ATEX Intrinsic Safety
Certificate
Standards
Markings
Input parameters
(power terminals)
Ui = 30 VUi = 11 VUo = 7.14 V
Ii = 200 mAIi = 300 mAIo = 112 mA
Pi = 1 WPi = 1 WPo = 1 W
Ci = 0 μFCi = 5.1 nFCo = 13.9 μF
14Emerson.com/Rosemount
Baseefa11ATEX0059X
EN IEC 60079-0:2018, EN 60079-11: 2012
II 1 G Ex ia IIC T4 Ga, T4(–40 °C ≤ Ta ≤ +70 °C)
Input parameters
(RS485)
Output parameters
(RS485)
September 2020Quick Start Guide
Input parameters
(power terminals)
Li = 0 mHLi = 0 mHLo=1000 μH
Special Conditions for Safe Use (X)
1. The plastic antenna may present a potential electrostatic ignition
hazard and must not be rubbed or cleaned with a dry cloth.
2. The Rosemount 781 enclosure is made of aluminum alloy and given a
protective paint finish; however, care should be taken to protect it
from impact or abrasion if located in a zone 0 environment.
3. The apparatus is not capable of withstanding the 500 V isolation test
required by EN 60079-11. This must be taken into account when
installing the apparatus.
6.7International
I7 IECEx Intrinsic Safety
Certificate
Standards
Markings
Input parameters
(power terminals)
Ui = 30 VUi = 11 VUo = 7.14 V
Ii = 200 mAIi = 300 mAIo = 112 mA
Pi = 1 WPi = 1 WPo = 1 W
Ci = 0 μFCi = 5.1 nFCo = 13.9 μF
Li = 0 mHLi = 0 mHLo=1000 μH
Input parameters
(RS485)
Output parameters
(RS485)
IECEx BAS 11.0028X
IEC 60079-0: 2011, IEC 60079-11: 2011
Ex ia IIC T4 Ga, T4(–40 °C ≤ Ta ≤ +70 °C)
Input parameters
(RS485)
Output parameters
(RS485)
Special Conditions for Safe Use (X)
1. The plastic antenna may present a potential electrostatic ignition
hazard and must not be rubbed or cleaned with a dry cloth.
2. The Rosemount 781 enclosure is made of aluminum alloy and given a
protective paint finish; however, care should be taken to protect it
from impact or abrasion if located in a zone 0 environment
3. The apparatus is not capable of withstanding the 500 V isolation test
required by EN 60079-11. This must be taken into account when
installing the apparatus.
Figure 6-1: Rosemount 781 Declaration of Conformity
Quick Start Guide19
Quick Start GuideSeptember 2020
20Emerson.com/Rosemount
September 2020Quick Start Guide
Quick Start Guide21
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China RoHS
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List of
Rosemount 781
Rosemount 781 Parts with China RoHS Concentration above MCVs
䜘Ԧ〠
Part Name
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Lead
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biphenyls
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Polybrominated
diphenyl ethers
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Electronics
Assembly
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Housing
Assembly
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SJ/T11364
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This table is proposed in accordance with the provision of SJ/T11364.
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GB/T 26572
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O: Indicate that said hazardous substance in all of the homogeneous materials for this part is below the limit requirement of
GB/T 26572.
X:
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GB/T 26572
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X: Indicate that said hazardous substance contained in at least one of the homogeneous materials used for this part is above
the limit requirement of GB/T 26572.
Emerson Terms and Conditions of Sale are
available upon request. The Emerson logo is a
trademark and service mark of Emerson Electric
Co. Rosemount is a mark of one of the Emerson
family of companies. All other marks are the
property of their respective owners.
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