Quick Start Guide
00825-0100-4075, Rev GE
September 2020
Emerson Wireless THUM™ Adapter
Quick Start Guide September 2020
Safety Messages
NOTICE
This guide provides basic guidelines for the Emerson Wireless THUM™ Adapter. It does not provide
instructions for detailed configuration, diagnostics, maintenance, service, troubleshooting, or
installations. Refer to the THUM Adapter Reference Manual for more instruction. The manual and this
guide are also available electronically on Emerson.com/Rosemount.
Equipment Damage
During normal operation, or in fault condition, the THUM Adapter will cause a 2.5 V drop in the
connected loop. It is important to ensure that the power supply can provide at least 2.5 V more than
the minimum operating voltage of the wired device to make sure it works properly with the THUM
Adapter installed. To determine the minimum operating voltage for the wired device, review the wired
device operation and installation manual.
NOTICE
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.
WARNING
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 approvals section of this
manual for any restrictions associated with a safe installation.Before connecting a handheld
communicator in an explosive atmosphere, ensure the instruments are installed in accordance with
intrinsically safe or non-incendive field wiring practices.
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.Device must be installed to ensure a minimum antenna separation distance of 8 in. (20
cm) from all persons.
Contents
Wireless considerations................................................................................................................5
Bench top configuration...............................................................................................................7
Physical installation...................................................................................................................... 8
Direct mount................................................................................................................................9
Remote mount...........................................................................................................................10
Wiring diagrams.........................................................................................................................11
Device network configuration.................................................................................................... 27
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September 2020 Quick Start Guide
AMS Device Manager................................................................................................................. 28
Field Communicator...................................................................................................................29
Perform loop current test........................................................................................................... 30
Verify operation......................................................................................................................... 32
Troubleshooting........................................................................................................................ 34
Reference information............................................................................................................... 35
Product Certifications.................................................................................................................36
Quick Start Guide 3
Quick Start Guide September 2020
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September 2020 Quick Start Guide
1 Wireless considerations
1.1 Power up sequence
The power module should not be installed on any wireless device until the
Emerson Wireless Gateway (Gateway) is installed and functioning properly.
Wireless devices should also be powered up in order of proximity from the
Gateway, beginning with the closest. This will result in a simpler and faster
network installation. Enable Active Advertising on the Gateway to ensure
that new devices join the network faster. For more information see the
Wireless Gateway Reference Manual.
1.2 THUM Adapter position
THUM Adapter should be positioned vertically straight up, and should be
approximately 3 ft. (1 m) from any large structure, building or conductive
surface to allow for clear communication to other devices. If the THUM
Adapter is mounted horizontally, wireless communication range may be
decreased. The THUM Adapter should not be mounted vertically straight
down. See Wireless THUM Adapter Reference Manual for more information.
Figure 1-1: THUM Adapter Position
1.3 Conduit entry
When installing the THUM Adapter into the conduit entry of a wired device,
use an approved thread sealant. Thread sealant provides a water tight seal.
The thread sealant also provides lubrication to ensure easy removal of the
THUM Adapter.
1.4
Quick Start Guide 5
M20 conduit adapter
When using the M20 Conduit Adapter on the THUM Adapter, use an
approved thread sealant and tighten wrench tight to the THUM Adapter.
When installing the M20 conduit adapter into a conduit, tighten to 32.5 Nm/25 ft-lb to ensure watertight seal.
Quick Start Guide September 2020
Field Communicator connections
In order for the Field Communicator to interface with the THUM Adapter,
the wired device must be powered. The Field Communicator must be put
into poll mode and should use the THUM Adapter address of 63.
1.5 Power supply
• Minimum loop load of 250 Ohms.
• The THUM Adapter communicates via and derives power from a
standard 4–20 mA/HART® loop. The THUM Adapter causes a small
voltage drop on the loop which is linear from 2.25 V at 3.5 mA to 1.2 V at
25 mA. Under fault conditions, the maximum voltage drop is 2.5 V. The
THUM Adapter will not affect the 4–20 mA signal under normal or fault
conditions as long as the loop has at least a 2.5 V margin at the
maximum loop current (25 mA for a typical 4–20 mA/HART device).
• Limit the power supply to 0.5 Amps maximum and voltage to 55 Vdc.
Loop current THUM Adapter voltage drop
3.5 mA 2.25 V
25 mA 1.2 V
1.6 Load resistor
If required, add a load resistor as shown in Figure 8 on page 10, Figure 12 on
page 13, and Figure 16 on page 15. The resistor should be adequately rated
for the application (1 W minimum) and be compatible with the supplied
splice connector which accepts wire sizes from 14 to 22 AWG.
1.7
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Loop
To ensure proper operation, the THUM Adapter should not be installed on a
HART loop with other active HART masters. HART masters that are active
periodically, such as a field communicator can be used on a loop with a
THUM Adapter.
A
Green
Red
Black
White
Yellow
B
C
D
+
-
Green
Red
Black
White
Yellow
A
B
C
+
-
D
September 2020 Quick Start Guide
2 Bench top configuration
When performing bench top configuration it is suggested that you connect
the THUM Adapter to a wired device. If this is not possible, the following
wiring diagrams can be used. For bench top configuration, ensure the power
supply used is limited to 0.5 A maximum.
Figure 2-1: THUM Adapter Only, Powered by a Current Source
A. THUM Adapter
B. Ground
C. 20 mA current source
D. HART Modem
Figure 2-2: THUM Adapter Only, Powered by a 24 V Power Supply with
1200 Ohm Resistor to Limit Current to 20 mA
Quick Start Guide 7
Quick Start Guide September 2020
3 Physical installation
The THUM Adapter can be installed in one of two configurations:
1. Direct mount: The THUM Adapter is connected directly to the
conduit entry of the wired device.
2. Remote mount: The THUM Adapter is mounted separate from the
wired device housing and then connected to the wired device using
conduit or other suitable means.
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September 2020 Quick Start Guide
4 Direct mount
Prerequisites
Install the HART device according to standard installation practices and the
manufacturer’s instructions, being sure to use an approved thread sealant
on all connections.
Procedure
1. Attach the THUM Adapter to the wired device as shown in Figure 4-1.
Figure 4-1: Direct Mount
2. Connect the THUM Adapter to the HART wired device using the
Wiring diagrams.
3. Close the housing cover on the HART wired device, so that metal
touches metal, but do not overtighten to prevent damaging the unit.
Note
Two splice connectors are included with the THUM Adapter. The first
is a two connection splice. The second is a three connection splice for
use with a resistor, if there is not enough resistance in the loop. Both
of these splice connectors can accept 14 to 22 gauge wire. See wired
device reference manual for information on the required loop
resistance.
Quick Start Guide 9
Quick Start Guide September 2020
5 Remote mount
Prerequisites
Install the HART device according to standard installation practices and the
manufacturer’s instructions, being sure to use an approved thread sealant
on all connections.
Procedure
1. The THUM Adapter should be mounted as shown in Figure 5-1.
Figure 5-1: Remote Mount
2. Ground the Remote Mount Kit per local practices.
3. Connect the THUM Adapter to the wired device using standard
practices. Wire running from the THUM Adapter to the wired device
should be shielded or in conduit when installed in electrically noisy
environments.
4. Connect the THUM Adapter to the HART wired device using the
Wiring diagrams.
5. Close the housing cover on the HART wired device, so that metal
touches metal, but do not overtighten to prevent damaging the unit.
Note
Two splice connectors are included with the THUM Adapter. The first
is a two connection splice. The second is a three connection splice for
use with a resistor, if there is not enough resistance in the loop. Both
of these splice connectors can accept 14 to 22 gauge wire. See wired
device reference manual for information on the required loop
resistance.
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A
Green
Red
Black
White
Yellow
4 -20 mA Loop +
4 -20 mA Loop -
B
C
D
E
F
- PWR/COMM
+ PWR/COMM
September 2020 Quick Start Guide
6 Wiring diagrams
Figure 6-1: Direct Mount Wiring Diagram for 2-Wire Device
A. THUM Adapter
B. Wired device
C. Ground
D. Splice connector
E. Load resistor ≥ 250 W
F. Power supply
Note
In order for the THUM Adapter to function properly there must be at least
250 Ohms resistance in the loop. If the 4–20 mA loop does not have the
required resistance, wire a resistor as shown in Figure 6-3,Figure 6-7, or
Figure 6-11 as applicable.
Quick Start Guide 11
A
B
Green
C
Red
Black
White
Yellow
D
+ COMM
- COMM
To Wired Device
4 -20 mA Loop +
4 -20 mA Loop -
E
F
Quick Start Guide September 2020
Figure 6-2: Remote Mount Wiring Diagram for 2-Wire Device
A. THUM Adapter
B. Remote mount housing
C. Ground
D. Shield wire
E. Load resistor ≥ 250 Ω
F. Power supply
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A
Green
Red
Black
White
Yellow
4 -20 mA Loop -
F
B
C
E
D
- PWR/COMM
+ PWR/COMM
4 -20 mA Loop +
September 2020 Quick Start Guide
Figure 6-3: Direct Mount Diagram for 2-Wire Device with Resistor
A. THUM Adapter
B. Wired device
C. Ground
D. Splice connector
E. Load resistor ≥ 250 Ω
F. Power supply
Quick Start Guide 13
A
B
C
Green
White
Yellow
Red
Black
D
E
+ COMM
- COMM
To Wired Device
4 - 20 mA Loop +
4 - 20 mA Loop -
+
-
F
Quick Start Guide September 2020
Figure 6-4: Direct Mount Wiring Diagram for 2-Wire Device with
Resistor
A. THUM Adapter
B. Remote mount housing
C. Ground
D. Shield wire
E. Load resistor ≥ 250 Ω
F. Power supply
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A
Green
Red
Black
White
Yellow
B
C
COMM +
COMM -
Power -
Power +
D
E
4 - 20 mA Loop +
4 -20 mA Loop -
F
September 2020 Quick Start Guide
Figure 6-5: Direct Mount Wiring Diagram for 4-Wire Passive Device
A. THUM Adapter
B. Wired device
C. Ground
D. Splice connector
E. Load resistor ≥ 250 Ω
F. Power supply
Note
A passive loop exists when the wired device is not supplying power to the 4–
20 mA loop. It is important to verify if the wired device is operating in active
or passive mode.
Quick Start Guide 15
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