Emerson Wireless Field Link Manuale utente

Quick Start Guide

00825-0100-4421, Rev DB

February 2019

Emerson™Wireless Field Link

February 2019

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

Quick Start Guide

February 2019

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

15- to 25-ft.

(4,6 to 7,6 m)

6-ft. (2 m)

February 2019

Quick Start Guide

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

Quick Start Guide

February 2019

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

February 2019

Quick Start Guide

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

Quick Start Guide

February 2019

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

February 2019

Quick Start Guide

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

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 Guide

February 2019

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 ★

February 2019

Quick Start Guide

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

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