Emerson Wireless Field Link User manual

Quick Start Guide
00825-0100-4421, Rev DB
February 2019
Emerson™Wireless Field Link

February 2019
2
Quick Start Guide
NOTICE
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.
Failure to follow these installation guidelines could result in death or serious injury.
Make sure only qualified personnel perform the installation.
Explosions could result in death or serious injury.
Installation of this transmitter in an explosive environment must be in accordance with the appropriate local,
national, and international standards, codes, and practices. Review the Product Certifications section for any
restrictions associated with a safe installation.
Electrical shock can result in death or serious injury.
Avoid contact with the leads and terminals. High voltage 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.
Contents
Wireless considerations . . . . . . . . . . . . . . . . . . . 3
Physical installation . . . . . . . . . . . . . . . . . . . . . . . 5
Verify operation . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Reference information . . . . . . . . . . . . . . . . . . . . 7
Ordering information . . . . . . . . . . . . . . . . . . . . . 9
Product certifications . . . . . . . . . . . . . . . . . . . . 11

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1.0 Wireless considerations
1.1 Power up sequence
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.
1.2 Mounting 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. Mounting Location
A. Control room
B. Ground
C. Field link
D. Mast or pipe
E. Infrastructure
AB
C
D
E
15- to 25-ft.
(4,6 to 7,6 m)
6-ft. (2 m)

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1.3 Antenna 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, building, or
conductive surface to allow for clear communication to other devices.
Figure 2. Antenna Position
1.4 Conduit plug
The temporary orange plugs should be replaced with the included conduit plugs
using approved thread sealant.
Figure 3. Conduit Plugs
A. Conduit plug
AA

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1.5 Intended 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.
Figure 4. Example System Architecture
2.0 Physical installation
2.1 Pipe mounting
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 L-shaped
bracket.
4. Use a 1/2-in. socket-head wrench to fasten the nuts to the U-bolt.
Figure 5. Mounting
A. Host system
B. Control network
C. Network manager
D. Field link
E. Wireless field network
F. Wireless field devices
A
B
C
D
E
F

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2.2 Power and data wiring
1. Remove housing cover labeled “Field Terminals.”
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.
Figure 6. Emerson Wireless Field Link Terminal Diagram
2.3 Grounding
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 or less.
3.0 Verify operation
3.1 Power-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
A. Data A (+)
B. Data B (–)
C. +10.5 to 30 VDC
D. Return
A
B
C
D

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3.2 Normal 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.
4.0 Reference information
Figure 7. Emerson Wireless Field Link Terminal Diagram
Note
The Emerson Wireless Field Link requires separate twisted shield pairs (four wires) for
power and data.
A. Data A (+)
B. Data B (–)
C. +10.5 to 30 VDC
D. Return
A
B
C
D

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Figure 8. Emerson Wireless Field Link Dimensional Drawing
Table 1. Emerson Wireless Field Link Specifications
A. 2x Conduit plug
B. Possible antenna rotation shown
C. Extended range antenna
D. WirelessHART®antenna
Item Specifications
Input power 10.5 – 30 VDC
Operating temperature –40 to 185 °F (–40 to 85 °C)
Wiring (power) 24 AWG - 14 AWG twisted shielded pair(1)
1. Ambient temperatures above 60 °C require wiring rated to at least 5 °C above max ambient temperature.
Wiring (RS-485 communications) 24 AWG - 14 AWG twisted shielded pair1
Less than 15 pF/ft capacitance.
Wiring distance 656 ft. (200 m)
Wireless protocol WirelessHART, 2.4 – 2.5 GHz DSSS
Wireless output power, EIRP 10 dBm with WK antenna and 12.5 dBm with WM antenna
Mounting All SST, 2-in. pipe and panel mount bracket
Humidity 0 – 90% relative humidity
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)

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5.0 Ordering information
Table 2. 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.
Model Product description
781 Emerson Wireless Field Link
Physical connection
A1 RS485 ★
Housing
DDual compartment housing - aluminum ★
EDual compartment housing - stainless steel ★
Conduit threads
11/2–14 NPT ★
2M20 ★
Product certifications
I5 USA Intrinsically Safe, Non-incendive ★
I6 Canada Intrinsically Safe ★
I1 ATEX Intrinsic Safety ★
I7 IECEx Intrinsic Safety ★
KD USA and Canada Intrinsically Safe, ATEX and IECEx Intrinsic Safety ★
I2 INMETRO, Intrinsic Safety ★
I4 Japan Intrinsic Safety ★
IM EAC Intrinsic Safety ★
I3 China (NEPSI) Intrinsic Safety ★
KL USA and Canada Intrinsic Safety, ATEX Intrinsic Safety ★
NA No Approvals ★
Wireless update rate, operating frequency and protocol
WA3 WirelessHART ★
Omnidirectional wireless antenna and SmartPower™
WK3 External antenna, line power 10 –30 VDC ★
WM3 Extended range, external antenna, line power 10 –30 VDC ★

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Options (Include with selected model number)
Meter
M5 LCD display ★
Gland and connector options
G2 Cable gland (7,5 –11,9 mm)
G4 Thin wire cable gland (3 –8 mm)
Typical model number: 781 A1 D 1 KL WA3 WK3 M5