Emerson Rosemount 848T Manuale utente
Quick Start Guide
00825-0100-4697, Rev WB
December 2021
Rosemount™ 848T FOUNDATION™ Fieldbus
High Density Temperature Transmitter
Contents
Introduction.................................................................................................................................3
Mount the transmitter..................................................................................................................7
Wire and apply power................................................................................................................ 15
Verify the tag............................................................................................................................. 22
Verify the transmitter configuration...........................................................................................23
Product certifications................................................................................................................. 24
Declaration of conformity.......................................................................................................... 36
China RoHS................................................................................................................................ 38
Quick Start Guide December 2021
2 Rosemount 848T
1 Introduction
The Rosemount 848T is optimized for process temperature measurement
because it can simultaneously measure eight separate and independent
temperature points with one transmitter. You can connect multiple
temperature sensor types to each transmitter. In addition, the Rosemount
848T can accept 4-20 mA inputs. The enhanced measurement capability of
the Rosemount 848T allows it to communicate these variables to any
FOUNDATION™ Fieldbus host or configuration tool.
1.1 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.
1.2 Hazard messages
This document uses the following criteria for hazard messages based on
ANSI standards Z535.6-2011 (R2017).
DANGER
Serious injury or death will occur if a hazardous situation is not avoided.
WARNING
Serious injury or death could occur if a hazardous situation is not avoided.
CAUTION
Minor or moderate injury will or could occur if a hazardous situation is not
avoided.
NOTICE
Data loss, property damage, hardware damage, or software damage can
occur if a situation is not avoided. There is no credible risk of physical injury.
December 2021 Quick Start Guide
Quick Start Guide 3
Physical access
NOTICE
Unauthorized personnel can potentially cause significant damage and/or
misconfiguration of end users' equipment. Protect against all intentional or
unintentional unauthorized use.
Physical security is an important part of any security program and
fundamental to protecting your system. Restrict physical access to protect
users' assets. This is true for all systems used within the facility.
1.3 Safety messages
Read this manual before working with the product. For personal and system
safety, and for optimum product performance, ensure you thoroughly
understand the contents before installing, using, or maintaining this
product.
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.
WARNING
Failure to follow these installation guidelines could result in death or
serious injury.
Ensure the transmitter is installed by qualified personnel and in accordance
with applicable code of practice.
WARNING
Process leaks could result in death or serious injury.
Do not remove the thermowell while in operation.
Install and tighten thermowells and sensors before applying pressure.
Quick Start Guide December 2021
4 Rosemount 848T
WARNING
Electrical shock could cause death or serious injury.
If the sensor is installed in a high-voltage environment and a fault or
installation error occurs, high voltage may be present on transmitter leads
and terminals.
Use extreme caution when making contact with the leads and terminals.
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 7.9 in. (20 cm) from all persons.
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 any re-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.
December 2021 Quick Start Guide
Quick Start Guide 5
1.4 Product recycling/disposal
Recycling of equipment and packaging should be taken into consideration
and disposed of in accordance with local and national legislation/
regulations.
Quick Start Guide December 2021
6 Rosemount 848T
2 Mount the transmitter
2.1 Mount to a DIN rail without an enclosure
To mount the transmitter to a DIN rail without an enclosure, follow these
steps:
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 transmitter and place onto the DIN rail. Release the mounting
clip. The transmitter should be securely fastened to the DIN rail.
Figure 2-1: Mount the transmitter to a DIN rail
A. Rosemount 848T without installed enclosure
B. DIN rail mounting clip
C. DIN rail
2.2 Mount to a panel from an aluminum junction box
Prerequisites
Use four 1/4-20 x 1.25-in. screws.
Procedure
Mount the transmitter to a panel from inside the junction box using one of
the following dimension drawings.
December 2021 Quick Start Guide
Quick Start Guide 7
Figure 2-2: Aluminum junction box with cable glands (option code JA4)
10.21
[259]
A
1.70
[43]
B
6.70
[170]
CD
3.67
[93]
E
.80
[20]
2.30
[58]
2.27
[58]
1.33
[34]
1.88
[48]
3.98
[101]
8.42
[214] 6.00
[152]
A. Nameplate
B. Removable wiring connector
C. Security switch
D. Simulation switch
E. External ground screw (optional)
Dimensions are in inches (millimeters).
Quick Start Guide December 2021
8 Rosemount 848T
Figure 2-3: Aluminum junction box with plugged holes (option code
JA5)
A
10.21
[259]
1.70
[43]
B
6.70
[170] CD
.80
[20]
2.30
[58]
3.21
[81]
1.33
[34]
1.88
[48]
3.97
[101]
E
7.14
[181]
6.00
[152]
A. Nameplate
B. Removable wiring connection
C. Security switch
D. Simulation switch
E. External ground screw (optional)
Dimensions are in inches (millimeters).
2.3 Mount to a panel from a stainless steel junction box
Prerequisites
Use two 1/4-20 x 1/2-in. screws.
Procedure
Mount the transmitter to a panel from inside the junction box using one of
the following dimension drawings.
December 2021 Quick Start Guide
Quick Start Guide 9
Figure 2-4: Stainless steel junction box with cable glands (option code
JS2)
9.91 (231)
7.7 (196)
C
1.8 (46)
1.1 (28) 1.73 (44)
2.4 (62)
1.2 (30) 1.8 (47)
4.0 (102)
9.14 (232.2)
7.72 (196)
6.61 (168)
A B
D E
A. Top view
B. 3-D view
C. Ground screw
D. Front view
E. Side view
Dimensions are in inches (millimeters).
Quick Start Guide December 2021
10 Rosemount 848T
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5
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