Reference Manual
00809-0100-4848, Rev BB
September 2019
Rosemount™ 848T Wireless Temperature
Transmitter
NOTICE
Read this manual before working with the product. For personal and system safety, and for optimum product performance, make
sure you thoroughly understand the contents before installing, using, or maintaining this product.
The United States has two toll-free assistance numbers and two international numbers.
Customer Central
United States: 1 800 999 9307
Asia Pacific: 65 77 8211
Europe/Middle East/Africa: 49 8153 9390
National Response Center
1 800 654 7768 (24 hours a day)
Equipment service needs
CAUTION
The products described in this document are NOT designed for nuclear-qualified applications. Using non-nuclear qualified
products in applications that require nuclear-qualified hardware or products may cause inaccurate readings.
For information on Rosemount nuclear-qualified products, contact a Emerson Sales Representative.
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, ensure the instruments are installed in accordance with
intrinsically safe or non-incendive field wiring practices.
Process leaks could result in death or serious injury.
Install and tighten thermowells and sensors before applying pressure.
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.
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.
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.
Physical access
Unauthorized personnel may pontentially cause significant damage to and/or misconfiguration of end users' equipment. This
could be international 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 unathorized personnel end users assets. This is true for all systems used within the facility.
2
NOTICE
The Rosemount 848T Wireless and all other wireless devices should be installed only after the Wireless Gateway has been installed
and is functioning properly. Wireless devices should also be powered up in order of proximity from the Wireless Gateway,
beginning with the closest. This will result in a simpler and faster network installation.
Shipping considerations for wireless products (lithium batteries):
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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Reference Manual Contents
00809-0100-4848 September 2019
Contents
Chapter 1 Introduction.................................................................................................................. 7
1.1 Using this manual.............................................................................................................................7
1.2 Safety messages...............................................................................................................................8
1.3 Considerations................................................................................................................................. 9
1.4 Return of materials.........................................................................................................................10
1.5 Product recycling/disposal............................................................................................................. 11
Chapter 2 Configuration...............................................................................................................13
2.1 Overview........................................................................................................................................ 13
2.2 Safety messages.............................................................................................................................13
2.3 Bench top configuration.................................................................................................................14
2.4 Default settings..............................................................................................................................15
2.5 Device network configuration........................................................................................................ 15
2.6 Sensor configuration...................................................................................................................... 17
2.7 Advanced configuration (optional).................................................................................................18
Chapter 3 Installation...................................................................................................................23
3.1 Safety messages.............................................................................................................................23
3.2 Wireless considerations..................................................................................................................23
3.3 Sensor connections........................................................................................................................ 25
3.4 Physical installation........................................................................................................................ 32
Chapter 4 Commissioning............................................................................................................ 37
4.1 Safety messages.............................................................................................................................37
4.2 Insert power module...................................................................................................................... 37
4.3 Network status............................................................................................................................... 38
4.4 Verify operation..............................................................................................................................38
Chapter 5 Operation and Maintenance.........................................................................................41
5.1 Safety messages.............................................................................................................................41
5.2 Calibration......................................................................................................................................41
5.3 Power module replacement........................................................................................................... 42
5.4 Spare parts..................................................................................................................................... 43
Chapter 6 Troubleshooting.......................................................................................................... 45
6.1 Safety messages.............................................................................................................................45
6.2 General information....................................................................................................................... 45
Chapter 7 Appendix A.................................................................................................................. 49
7.1 Product certifications..................................................................................................................... 49
7.2 Ordering, information, specifications, and dimensional drawings...................................................49
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Contents Reference Manual
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vi Emerson.com/Rosemount
Reference Manual
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Introduction
1 Introduction
1.1 Using this manual
This manual is designed to assist in the installation, operation, and maintenance of
Rosemount™ 848T Wireless Temperature Transmitter.
Introduction
• Manual and Transmitter Overview
• Considerations
• Return of Materials
• Product Recycling/Disposal
Configuration
• Introduction
• Bench Top Configuration
• Default Settings
• Device Network Configuration
• Sensor Configuration
• Advanced Configuration
Installation
• Wireless Considerations
• Sensor Connections
• Physical Installation
• 4-20 Milliamp Inputs
Commissioning
• Insert Power Module
• Network Status
• Verify Operation
Operation and Maintenance
• Calibration
• Power Module Replacement
Troubleshooting
• General Information
Specifications and Reference Data
• Specification
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• Dimensional drawings
• Ordering Information
Product Certifications
• Product Certifications
• Installation Drawings
Rosemount 848T Wireless Temperature Transmitter
Features of the Rosemount 848T Wireless include:
• Up to four independently configurable RTD, thermocouple, ohm, millivolt, and 4–20
mA inputs
• Eight user-configurable alerts for process and device variables
• Efficient wireless network utilization by sending all four sensor readings in one
transmitted message
• Installation and operational savings for high density applications
Refer to the following literature for a full range of compatible connection heads, sensors,
and thermowells provided by Emerson Process Management.
• Rosemount Volume 1 Temperature Sensors and Accessories (English)
• Rosemount DIN-Style Temperature Sensors and Thermowells (Metric)
1.2 Safety messages
Instructions and procedures in this section may require special precautions to ensure the
safety of the personnel performing the operations. Information that potentially raises
safety issues is indicated by a warning symbol (
before performing an operation preceded by this symbol.
WARNING
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.
Before connecting a Field Communicator in an explosive atmosphere, make sure the
instruments are installed in accordance with intrinsically safe or non-incendive field wiring
practices.
Verify the operating atmosphere of the transmitter is consistent with the appropriate
hazardous locations certifications.
). Refer to the following safety messages
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.
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Introduction
WARNING
Electrical shock could cause death or serious injury.
Use extreme caution when making contact with the leads and terminals.
The power module with the wireless unit contains two “C” size cells. Each of the primary
lithium/thionyl chloride battery contains approximately 2.5 grams of lithium, for a total of
5 grams in each power module. Under normal conditions, the battery materials are selfcontained and are not reactive as long as the batteries and the module integrity are
maintained. Care should be taken to prevent thermal, electrical or mechanical damage.
Contacts should be protected to prevent premature discharge.
Battery hazards remain when cells are discharged.
Power modules should be stored in a clean and dry area. For maximum life, storage
temperature should not exceed 30 °C.
1.3 Considerations
1.3.1 General
Electrical temperature sensors such as RTDs and thermocouples produce low-level signals
proportional to their sensed temperature. The Rosemount 848T converts this signal into a
robust WirelessHART® digital signal.
1.3.2
1.3.3
Commissioning
The transmitter can be commissioned before or after installation. It may be useful to
commission it on the bench, before installation, to ensure proper operation and to
become familiar with its functionality. When applicable, make sure the instruments are
installed in accordance with intrinsically safe or non-incendive field wiring practices. The
device will be powered whenever the power module is installed. To avoid depleting the
power module, make sure it is removed when the device is not in use.
Mechanical
Location
When choosing an installation location and position, take into account the need for access
to the transmitter. For best performance, the antenna should be vertical with the conduit
entries facing downward. The antenna should have space between objects in a parallel
metal plane, such as pipes or metal framework, as they may adversely affect the
performance of the antenna. Place the antenna 18–36 in. (0.46–0.91 m) from any solid
metal surface, building, or structure.
Note
The antenna can only rotate backwards.
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Reference Manual
1.3.4 Electrical
Power module
The Rosemount 848T Wireless Temperature Transmitter is self-powered. The power
module with the wireless unit contains two “C” size primary lithium/thionyl chloride
batteries. Each battery contains approximately two-and-a-half grams of lithium, for a total
of five grams in each power module. Under normal conditions, the battery materials are
self-contained and are not reactive as long as the batteries and the power module are
maintained. Care should be taken to prevent thermal, electrical or mechanical damage.
Contacts should be protected to prevent premature discharge.
Use caution when handling the power module, it may be damaged if dropped from
heights in excess of 20 feet (6 m).
Sensors
Make sensor connections through the conduit entries on the bottom of the enclosure. Be
sure to provide adequate clearance for cover removal.
1.3.5
Environmental
Verify that the operating atmosphere of the transmitter is consistent with the appropriate
hazardous locations certifications.
Temperature effects
The transmitter will operate within specifications for ambient temperatures between –40
and 185 °F (–40 and 85 °C).
Note
If the ambient temperature is outside of the specification limit, consider moving the
transmitter to a location within the specified limits.
1.4 Return of materials
To expedite the return process in North America, call the Emerson National Response
Center toll-free at 800 654 7768. This center, available 24 hours a day, will assist you with
any needed information or materials.
The center will ask for the following information:
• Product model
• Serial numbers
• The last process material to which the product was exposed
The center will provide:
• A Return Material Authorization (RMA) number
• Instructions and procedures that are necessary to return goods that were exposed to
hazardous substances
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For other locations outside North America, contact an Emerson Process Management sales
representative for further instructions.
Note
If the device has been exposed to a hazardous substance, a Material Safety Data Sheet
(MSDS) must be included with the returned materials. An MSDS is required by law to be
available to people exposed to specific hazardous substances.
1.4.1 Shipping considerations for wireless products (Lithium batteries)
The unit was shipped to you without the power module installed. Please remove the
power module prior to shipping the unit.
Primary lithium batteries (charged or discharged) 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. Please consult
current regulations and requirements before shipping.
1.5 Product recycling/disposal
Recycling of equipment and packaging should be taken into consideration and disposed of
in accordance with local and national legislation/regulations.
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2 Configuration
2.1 Overview
This section contains information on configuration and verification that should be
performed prior to installation.
Field Communicator and AMS Wireless Configurator instructions are included for
performing configuration functions. Additionally, Field Communicator Fast Key sequences
are identified for each software function.
Example of Fast Key sequence listing
Fast Keys
1, 2, 3, etc.
2.2 Safety messages
Instructions and procedures in this section may require special precautions to ensure the
safety of the personnel performing the operations. Information that potentially raises
safety issues is indicated by a warning symbol (
before performing an operation preceded by this symbol.
WARNING
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.
Before connecting a Field Communicator in an explosive atmosphere, make sure the
instruments are installed in accordance with intrinsically safe or non-incendive field wiring
practices.
Verify that the operating atmosphere of the transmitter is consistent with the appropriate
hazardous locations certifications.
Process leaks could result in death or serious injury.
). Refer to the following safety messages
Do not remove the thermowell while in operation.
Install and tighten thermowells and sensors before applying pressure.
Electrical shock could cause death or serious injury.
Use extreme caution when making contact with the leads and terminals.
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Configuration Reference Manual
September 2019 00809-0100-4848
WARNING
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.
WARNING
If the sensor is installed in a high-voltage environment and a fault condition or installation
error occurs, the sensor leads and transmitter terminals could carry lethal voltages. Use
extreme caution when making contact with the leads and terminals.
2.3 Bench top configuration
2.3.1
Bench top configuration requires a Field Communicator or AMS Wireless Configurator.
Connect the Field Communicator leads to the terminals labeled “COMM” on the terminal
block, as shown in Figure 2-1.
Bench top configuration is testing of the transmitter and verifying the transmitter
configuration data. Configuring the transmitter on the bench prior to installation ensures
all network settings are working correctly.
When using a Field Communicator, any configuration changes made must be sent to the
transmitter using the Send key (F2). AMS Wireless Configurator changes are implemented
by selecting the Apply button.
AMS Wireless Configurator
AMS Wireless Configurator is capable of connecting to devices directly, using a HART
modem, or wirelessly using the Emerson Smart Wireless Gateway. When configuring the
device, double click the device icon or right click and select Configure.
®
Connection diagrams
Bench hook-up
Connect the bench equipment as shown in Figure 2-1 and turn the Field Communicator on
by selecting the ON/OFF key or log into AMS Wireless Configurator. The Field
Communicator or AMS Wireless Configurator will search for a HART® compatible device
and indicate when it is connected. If the Field Communicator or AMS Wireless
Configurator fail to connect, it indicates that no device was found. Refer to
Troubleshooting.
Field hook-up
The wiring for a field hook-up for a Field Communicator or AMS Wireless Configurator,
illustrated in Figure 2-1, by connecting at “COMM” on the transmitter terminal block.
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Figure 2-1: Field Communicator Connection
2.4 Default settings
The Rosemount™ 848T Wireless Transmitter default configuration is shown below:
Sensor 1
Sensor 2 Type J Thermocouple
Sensor 3 Type J Thermocouple
Sensor 4 Type J Thermocouple
Engineering Units °C
Number of Lead Wires 2
Sensor Alerts Disabled
Network ID Factory Generated Network Parameters
Join Key Factory Generated Network Parameters
Update Rate 1 Minute
Use the C1 option code to have the factory configure each sensor individually. This option
also enables factory configuration of process alerts, update rate, and channel tag. This
option code is not required to configure the self-organizing network parameters, or to set
all of the sensors identically.
Type J Thermocouple
2.5 Device network configuration
2.5.1 Join device to network
Fast Keys 1, 12
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