Rosemount 848T User manual

Quick Start Guide
00825-0100-4848, Rev EA
June 2016
Rosemount™848T Wireless Temperature
Transmitter

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Quick Start Guide
NOTICE
This guide provides basic guidelines for the Rosemount 848T. It does not provide instructions for detailed
configuration, diagnostics, maintenance, service, troubleshooting, or installations. Refer to the Rosemount
848T Reference Manual for more instruction. The manual and this guide are also available electronically on
EmersonProcess.com/Rosemount.
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.
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. 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. 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.
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.
NOTICE
Shipping considerations for wireless products:
The unit was shipped to you without the power module installed. Remove the power module prior to
shipping the unit.
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. Please consult current regulations and requirements before shipping.
Contents
Wireless considerations. . . . . . . . . . . . . . . . . . . . 3
Physical installation . . . . . . . . . . . . . . . . . . . . . . . 5
Verify operation . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Reference information. . . . . . . . . . . . . . . . . . . . 10
Product Certifications . . . . . . . . . . . . . . . . . . . . 12

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1.0 Wireless considerations
1.1 Power up sequence
The power module should not be installed on any wireless device until the
Emerson™Smart 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 Smart Wireless
Gateway Reference Manual.
1.2 Antenna position
The antenna should be positioned vertically and it should be approximately 3 ft.
(1 m) from any large structure, building, or conductive surface to allow for clear
communication to other devices.
Figure 1. Antenna Position
1.3 Conduit plug
The temporary orange plugs should be replaced with the included conduit plugs
using approved thread sealant.

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Figure 2. Conduit Plug
1.4 Field Communicator connections
The power module needs to be connected for the Field Communicator to
interface with the Rosemount 848T Wireless.
Figure 3. Connection Diagram
A. Maintenance Port
A

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2.0 Physical installation
2.1 Initial configuration
If the device was ordered with a factory configured Network ID and Join Key, it
should join the network with no user input. If unsure, the Network ID and the Join
Key may be manually entered to match the Gateway’s.
The Network ID and Join Key may be obtained from the Gateway on the
Setup>Network>Settings page on the web server.
The Network ID and Join Key may be changed in the wireless device by using the
following Fast Key sequence.
2.2 Sensor configuration
Sensor inputs can be configured for different sensor types. To verify or change the
sensor configuration with a Field Communicator, use the following Fast Key
sequence.
2.3 Remote mount
The Rosemount 848T Wireless is designed to be installed only in the Remote
Mount configuration where the sensor is mounted separate from the Rosemount
848T housing, then connected to the Rosemount 848T via conduit.
1. Install the sensor according to standard installation practices. Be sure to use
thread sealant on all connections.
Function Fast Key sequence Menu items
Wireless 2,1,1 Join Device to Network
Function Fast Key sequence Menu items
Sensor Configuration 2,1,3 Configure Sensors

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2. To reduce sensor wiring length, mount the Rosemount 848T Wireless
transmitter central to all of the measurements. When installing the
Rosemount 848T Wireless, the conduit entries need to be facing downward. If
using the mounting bracket (Option Code B6), mount to a 2-in. pipe.
3. Run wiring (and conduit, if necessary) from the sensor to the Rosemount
848T. For an easier installation, use the outside conduit entries as shown
below. Any unused conduit entries should be sealed with approved sealant
using the included threaded conduit plugs.
A. Conduit Entry
B. Conduit Plug
4. Pull the wiring through the threaded conduit entry of the 848T.
5. Attach the sensor wiring to the terminals as indicated on the wiring diagram.
Note that Terminal screw 5 is for attaching the shield wire of the sensor to the
device. See Rosemount 848T Wireless Reference Manual for more
information.
A
AAAB

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6. To connect the power module, remove the plastic plug from the receptacle.
A. Plastic Plug
7. After initial installation, close the housing cover securely. Always ensure a
proper seal by installing the electronics housing cover so that metal touches
metal, but do not over tighten.
8. Position the antenna vertically. The antenna should be approximately three
feet (1 m) from any large structures or buildings to allow clear communication
to other devices.
2.4 Installing the optional voltage adapter
The Rosemount 848T Wireless voltage adapter allows voltage measurement
from 0-10 volts. Each adapter accommodates 2 voltage inputs, and can be
installed interchangeably on inputs 1 and 2 or 3 and 4.
To install voltage adapter:
1. Open terminal screws 2 and 3 on BOTH inputs. Note that the screws are
captive and should NOT be completely removed by using excess force.
A

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2. Angle adapter and slide spade lugs into terminals 2 and 3 on the left side, as
shown in the figure below. Ensure that the positive and negative polarity
indicators match on the adapter and the terminal block.
3. Lower right side of adapter into terminals 2 and 3 on the right side and center
the adapter.
4. Tighten all terminal screws to lock divider in place.
3.0 Verify operation
Operation can be verified using one of three methods: Field Communicator, the
Smart Wireless Gateway’s integrated web interface, or via AMS™Wireless
Configurator.
3.1 Field Communicator
For HART®communication, an Rosemount 848T Wireless Device Dashboard (DD)
is required. For connecting with a Field Communicator, refer to Figure 3 on
page 4.
3.2 Smart Wireless Gateway
In the Gateway’s integrated web interface, navigate to the Explorer page. This
page shows whether the device has joined the network and if it is communicating
properly.
Note
It may take several minutes for the device to join the network.
Note
If the device joins the network and immediately has an alarm present, it is likely due to
sensor configuration. Check the sensor wiring (see “Rosemount 848T Terminal Diagram” on
page 10) and the sensor configuration (see “Rosemount 848T Fast Key Sequence for Field
Communicator” on page 10).
Function Fast Key sequence Menu items
Communications 3,3
Join Status, Communications Status, Join Mode,
Number of Advertisements Heard, Number of
Available Neighbors, Number of Join Attempts

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Figure 4. Smart Wireless Gateway Explorer Page
3.3 AMS Wireless Configurator
When the device has joined the network, it will appear in the AMS Device
Manager as illustrated below:
Figure 5. AMS Wireless Configurator Explorer Page

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4.0 Reference information
Figure 6. Rosemount 848T Terminal Diagram
Figure 7. Sensor Wiring Diagrams
A. 2-wire RTD, Ohm
B. 4-wire RTD, Ohm
C. 3-wire RTD, Ohm
D. Thermocouple, millivolt
Table 1. Rosemount 848T Fast Key Sequence for Field Communicator
Function Fast Key sequence Menu items
Device Information 1, 1, 13
Manufacturer, Model, Final Assembly Number,
Universal, Field Device, Software, Hardware,
Descriptor, Message, Date, Model Number SI Unit
Control, Country, Device ID
Guided Setup 2, 1
Join Device to Network, Configure Update Rate,
Configure Sensor, Calibrate Sensors, Configure
Alerts
Manual Setup 2, 2 Wireless, Sensor 1, Sensor 2, Sensor 3, Sensor 4,
Device Temperature, Device Information, Other
Wireless 2, 2, 1
Network ID, Join Device to Network, Configure
Update Rate, Configure Broadcast Power Level,
Power Mode, Power Source
Sensor Calibration 3, 4, 1-4 Sensor 1-4, Current Upper Trim, Current Lower Trim, Lower Sensor Trim, Upper Sensor Trim, Recall
Factory Trim, RTD 2 Wire Offset
+-
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
AC
BD