Emerson Rosemount 848T User manual

Quick Start Guide
00825-0100-4697, Rev TC
May 2019
Rosemount™ 848T FOUNDATION™ Fieldbus
High Density Temperature Transmitter
Device Revision 8 - Requires New DD/CFF
Revision

Contents
About this guide...........................................................................................................................3
Mount the transmitter..................................................................................................................5
Wire and apply power...................................................................................................................9
Verify the tag............................................................................................................................. 16
Verify the transmitter configuration...........................................................................................17
Product certifications................................................................................................................. 18
Declaration of conformity.......................................................................................................... 32
China RoHS................................................................................................................................ 34
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2 Rosemount 848T

1 About this guide
This guide provides basic guidelines for the Rosemount™ 848T Temperature
Transmitter. It does not provide instructions for detailed configuration,
diagnostics, maintenance, service, troubleshooting. Refer to the Rosemount
848T Reference Manual for more instruction. The manual and this guide are
also available electronically on Emerson.com/Rosemount
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 Field Communicator in an explosive atmosphere,
make sure the instruments in the loop are installed in accordance with
intrinsically safe or non-incendive field wiring practices.
Electrical shock can result in death or serious injury.
•Avoid contact with the leads and terminals. High voltage that may be
present on leads can cause electrical shock.
Physical access
•Unauthorized personnel may potentially cause significant damage to
and/or misconfiguration of end users’ equipment. This could be
intentional or unintentional and needs to be protected against.
•Physical security is an important part of any security program and
fundamental to protecting your system. Restrict physical access by
unauthorized personnel to protect end users’ assets. This is true for all
systems used within the facility.
CAUTION
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 20 cm from all persons.
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Quick Start Guide 3

NOTICE
Battery hazards remain when cells are discharged.
The power module may be replaced in a hazardous area. The power module
has surface resistivity greater than one gigaohm and must be properly
installed in the wireless device enclosure. Care must be taken during
transportation to and from the point of installation to prevent electrostatic
charge build-up.
Shipping considerations for wireless products.
•The unit was shipped to you without the power module installed.
Remove the power module prior to shipping.
•Each power module contains two “C” size primary lithium batteries.
Primary lithium batteries are regulated in transportation by the U. S.
Department of Transportation, and are also covered by IATA
(International Air Transport Association), ICAO (International Civil
Aviation Organization), and ARD (European Ground Transportation of
Dangerous Goods). It is the responsibility of the shipper to ensure
compliance with these or any other local requirements. Consult current
regulations and requirements before shipping.
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4 Rosemount 848T

2 Mount the transmitter
2.1 Mount to a DIN rail without a junction box
Procedure
1. Pull up the DIN rail mounting clip located on the top back side of the
transmitter.
2. Hinge the DIN rail into the slots on the bottom of the transmitter.
3. Tilt the Rosemount™ 848T and place onto the DIN rail.
4. Release the mounting clip.
Figure 2-1: Mounting the Rosemount 848T to a DIN Rail
A
B
C
A. Rosemount 848T without installed enclosure
B. DIN rail
C. DIN rail mounting clip
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2.2 Mount to a panel with a junction box
Figure 2-2: Aluminum/Plastic Junction Box
A
B
C
A. Aluminum or plastic junction box
B. Mounting screws (4)(1)
C. Panel
Figure 2-3: Stainless Steel Junction Box
A
B
C
A. Stainless steel junction box
B. Mounting screws (2)(1)
C. Panel
(1) Mount using four ¼–20 x 1.25-in. screws.
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6 Rosemount 848T

2.3 Mount to a 2-in. pipe stand
Prerequisites
Use the optional mounting bracket (option code B6) to attach the
Rosemount™ 848T to a 2-in. pipe stand when using a junction box.
Figure 2-4: Aluminum/Plastic Junction Box
Front view Side view
5.1
(130)
10.2
(260)
6.6
(167)
Figure 2-5: Stainless Steel Junction Box
Front view Side view
4.7 (114)
7.5 (190)
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Figure 2-6: Mounted on a Vertical Pipe
Aluminum/plastic junction box Stainless steel junction box
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8 Rosemount 848T

3 Wire and apply power
3.1 Using cable glands
Figure 3-1: Cable Gland
ACEGI
J
BDFH
A. Sensor 1
B. Sensor 2
C. Sensor 3
D. Sensor 4
E. Sensor 5
F. Sensor 6
G. Sensor 7
H. Sensor 8
I. Power/signal
J. Cover screw
Procedure
1. Remove the four cover screws to remove the junction box cover.
2. Run the sensor and power/signal wires through the appropriate pre-
installed cable glands.
3. Install the sensor wires into the correct screw terminals.
4. Attach the FOUNDATION™ Fieldbus wires to the screw terminals.
5. Replace the FOUNDATION Fieldbus cover and tighten all cover screws.
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3.2 Using conduit entries
Figure 3-2: Conduit Entries
F
ABCD
E
A. Sensor 1 and 2
B. Sensor 3 and 4
C. Sensor 5 and 6
D. Sensor 7 and 8
E. Power/signal
F. Cover screw
Procedure
1. Unscrew the four cover screws to remove the junction box cover.
2. Remove the five conduit plugs and install the user-supplied conduit
fittings.
3. Run pairs of sensor wires through each conduit fitting.
4. Install the sensor wires into the correct screw terminals.
5. Attach the FOUNDATION™ Fieldbus wires to the screw terminals.
6. Replace the enclosure cover and tighten all cover screws.
3.3 Sensor wiring and power supply
•Compatible with eight independently configurable channels including
combinations of 2- and 3-wire RTDs, thermocouples, mV, ohm, and mA
sensors.
•All sensor and power terminals are rated to 42.4 Vdc.
•FOUNDATION Fieldbus network powered with a terminal voltage of 9.0–
32.0 Vdc and 22 mA maximum current draw.
•For best network performance twisted, shielded pair cabling should be
used. Proper gage wire should be selected to maintain the 9.0 Vdc
minimum.
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10 Rosemount 848T