Emerson Rosemount 248 User manual

Quick Start Guide
00825-0300-4248, Rev AA
July 2020
Rosemount™ 248 Wireless Temperature
Transmitter

Contents
About this guide...........................................................................................................................3
Wireless considerations................................................................................................................6
Physical installation...................................................................................................................... 7
Verify operations........................................................................................................................11
Reference information............................................................................................................... 14
Power module replacement....................................................................................................... 17
Product certifications................................................................................................................. 19
Declaration of conformity.......................................................................................................... 23
China RoHS................................................................................................................................ 25
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1 About this guide
This guide provides basic guidelines to install the Rosemount 248 Wireless
Temperature Transmmitter. It does not provide instructions for detailed
configuration, diagnostics, maintenance, service, troubleshooting, or
installations. Refer to the Rosemount 248 Temperature Transmitter
Reference Manual for more instruction. The manual and this guide are also
available electronically at Emerson.com/Rosemount.
1.1 Safety messages
WARNING
Failure to follow these installation guidelines could result in death or
serious injury.
Ensure only qualified personnel perform the installation.
Explosions
Explosions could result in death or serious injury.
Installation of device in an explosive environment must be in accordance
with appropriate local, national, and international standards, codes, and
practices.
Review the Hazardous Locations Certifications for any restrictions
associated with a safe installation.
Process leaks
Process leaks could result in death or serious injury.
Install and tighten thermowells and sensors before applying pressure.
Do not remove the thermowell while in operation.
Electrical shock
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.
Unless marked, the conduit/cable entries in the transmitter housing use
a ½–14 NPT thread form. Entries marked “M20” are M20 × 1.5 thread
form. On devices with multiple conduit entries, all entries will have the
same thread form. Only use plugs, adapters, glands, or conduit with a
compatible thread form when closing these entries.
When installing in a hazardous location, use only appropriately listed or
Ex certified plugs, glands, or adapters in cable/conduit entries.
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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.
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 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.
NOTICE
Power module considerations (Green Power Module, model number
701PGNKF)
The green power module with the wireless unit contains one “D” size
primary lithium-thionyl chloride battery (model number 701PGNKF).
Each battery contains approximately 5.0 grams of lithium. Under normal
conditions, the battery materials are self-contained and are not reactive
as long as the batteries and the pack 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
battery life, storage temperature should not exceed 86 °F (30 °C).
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NOTICE
Shipping considerations for wireless products (lithium batteries: Green
Power Module, model number 701PGNKF)
The unit was shipped to you without the power module installed.
Remove the power module prior to shipping.
Each power module contains one “D” size primary lithium battery.
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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2 Wireless considerations
2.1 Power up sequence
The Rosemount 248 Wireless Transmitter and all other devices should be
installed only after the Wireless Gateway (“Gateway”) has been installed and
is 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 new devices join the network faster. For more
information see the Emerson Wireless Gateway Reference Manual.
2.2 Antenna position
The internal antenna is designed for multiple mounting orientations. The
transmitter should be mounted according to best practices for your
temperature measurement application. The transmitter should be
approximately 3 ft. (1 m) from any large structure or building to allow clear
communication to other devices.
2.3 Field Communicator connections
The power module must be installed in the device for the Field
Communicator to interface with the transmitter. The Field Communicator
connections are located on the Green Power Module. To communicate to
the transmitter, begin by removing the power module cover. This will
expose the HART® communication terminals located on the Green Power
Module. Next, connect the Field Communicator leads to the COMM port
connections on the Green Power Module.
This transmitter uses the Green Power Module; order model number
701PGNKF. The power module is keyed and can only be inserted in one
orientation. Field communication with this device requires a HART-based
Field Communicator. Refer to Figure 2-1 for instructions on connecting the
Field Communicator to the transmitter.
Figure 2-1: Field Communicator Connection
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3 Physical installation
The transmitter can be installed in one of two configurations: Direct Mount,
where the sensor is connected directly to the transmitter conduit entry, or
Remote Mount, where the sensor is mounted separately from the
transmitter housing, then connected to the transmitter via conduit. Choose
the installation sequence that corresponds to the mounting configuration.
Upon installation of the transmitter, ensure that the conduit entry has an
installed conduit fitting or cable gland with approved thread sealant.
3.1 Direct mount
The direct mount installation should not be used when installing with a
Swagelok® fitting.
Procedure
1. Remove the transmitter enclosure cover.
2. Remove the LCD display (if applicable).
3. Loosen the captive screws and remove LCD display adapter plate (if
applicable).
Figure 3-1: Exploded View of LCD Display Assembly
4. Attach the sensor to the transmitter housing using the threaded
conduit entry. Be sure to use an approved thread sealant on all
connections.
5. Attach the sensor wiring to the terminals as indicated on Figure
1Figure 5-1.
6. Reattach and secure LCD display adapter plate to 5 in-lb of torque (if
applicable).
7. Reattach the LCD display (if applicable).
8. Reattach and tighten the transmitter enclosure cover.
9. Remove the power module cover.
10. Connect the Green Power Module.
11. Reattach and tighten the power module cover.
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12. Always ensure a proper seal by installing the electronics housing
cover(s) so that polymer contacts polymer (i.e. no O-ring visible).
Use Rosemount O-rings.
13. Provide 1.75-in. (45 mm) of clearance for units without an LCD
display. Provide 3-in. (76 mm) of clearance for units with an LCD
display for cover removal.
Figure 3-2: Direct Mount
Dimensions are in inches (millimeters).
Note
Wireless devices should be powered up in order of proximity from
the Gateway, beginning with the closest device to the Gateway. This
will result in a simpler and faster network installation.
3.2 Remote mount
Procedure
1. Remove the transmitter enclosure cover.
2. Remove the LCD display (if applicable).
3. Loosen the captive screws and remove LCD display adapter plate (if
applicable). Refer to Figure 3-3.
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Figure 3-3: Exploded View of LCD Display Assembly
4. Run wiring (and conduit, if necessary) from the sensor to the
transmitter.
Note
Use an ½-in. NPT when mating conduit to the transmitter.
5. Pull the wiring through the threaded conduit entry of the
transmitter.
6. Attach the sensor wiring to the terminals as indicated on Figure
1Figure 5-1.
7. Reattach and secure LCD display adapter plate to 5 in-lb of torque (if
applicable).
8. Reattach the LCD display (if applicable).
9. Reattach and tighten the transmitter enclosure cover.
10. Remove the power module cover.
11. Connect the Green Power Module.
12. Reattach and tighten the power module cover.
13. Always ensure a proper seal by installing the electronics housing
cover(s) so that polymer contacts polymer (i.e. no O-ring visible).
Use Rosemount O-rings.
14. Provide 1.75-in. (45 mm) of clearance for units without an LCD
display. Provide 3-in. (76 mm) of clearance for units with an LCD
display for cover removal.
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Figure 3-4: Remote Mount
Dimensions are in inches (millimeters).
Note
Wireless devices should be powered up in order of proximity from
the Wireless Gateway, beginning with the closest device to the
Gateway. This will result in a simpler and faster network installation.
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