Reference Manual
00809-0100-4248, Rev DB
Rosemount™ 248 Wireless Temperature
Transmitter
July 2020
Rosemount 248 Wireless Hardware Revision 1
HART® Device Revision 1
Device Install Kit/DD Revision Device Revision 01, DD Revision 01 or greater
Device Type 2676
NOTICE
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.
For technical assistance, contacts are listed below:
Customer Central
Technical support, quoting, and order-related questions.
United States - 1-800-999-9307 (7:00 am to 7:00 pm CST)
Asia Pacific- 65 777 8211
Europe/Middle East/Africa - 49 (8153) 9390
North American Response Center
Equipment service needs
1-800-654-7768 (24 hours—includes Canada)
Outside of these areas, contact your local Emerson representative.
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 your local Emerson Sales Representative.
WARNING
Failure to follow these installation guidelines could result in death or serious injury.
Ensure only qualified personnel perform the installation.
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.
Verify that the operating environment of the device is consistent with the appropriate hazardous locations certifications.
Process leaks may cause harm or result in death.
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.
Avoid contact with the leads and terminals. High voltage that may be present on leads can cause electrical shock.
2
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.
Changes or modifications not expressly approved by Rosemount can void the user's authority to operate the equipment.
This device contains licence-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development
Canada’s licence-exempt RSS(s).
Operation is subject to the following two conditions:
1. This device may not cause interference.
2. This device must accept any interference, including interference that may cause undesired operation of the device.
L’émetteur/récepteur exempt de licence contenu dans le présent appareil est conforme aux CNR d’Innovation, Sciences et
Développement économique Canada applicables aux appareils radio exempts de licence.
L’exploitation est autorisée aux deux conditions suivantes :
1. L’appareil ne doit pas produire de brouillage;
2. L’appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d’en compromettre le
fonctionnement.
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
Before installing the wireless transmitters
The Rosemount 248 Wireless Temperature Transmitter 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: 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 Green Power Module contains one “D” size primary lithium-thionyl chloride 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.
3
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 selfcontained 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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Reference Manual Contents
00809-0100-4248 July 2020
Contents
Chapter 1 Introduction.............................................................................................................. 7
1.1 Using this manual........................................................................................................................ 7
1.2 Product recycling/disposal...........................................................................................................7
Chapter 2 Configuration............................................................................................................ 9
2.1 Overview..................................................................................................................................... 9
2.2 Safety messages.......................................................................................................................... 9
2.3 Sensor connections....................................................................................................................10
2.4 Bench top configuration............................................................................................................ 14
2.5 Device network configuration....................................................................................................16
2.6 Remove power module..............................................................................................................24
Chapter 3 Installation...............................................................................................................25
3.1 Safety messages........................................................................................................................ 25
3.2 Wireless considerations............................................................................................................. 26
3.3 Field Communicator connections.............................................................................................. 26
3.4 Mounting...................................................................................................................................28
3.5 Physical installation....................................................................................................................29
Chapter 4 Commissioning........................................................................................................ 35
4.1 Safety messages........................................................................................................................ 35
4.2 Verify operations....................................................................................................................... 36
4.3 Reference information...............................................................................................................38
Chapter 5 Operation and maintenance.....................................................................................41
5.1 Safety messages........................................................................................................................ 41
5.2 LCD display screen messages.....................................................................................................42
5.3 Power module replacement.......................................................................................................44
Chapter 6 Troubleshooting...................................................................................................... 47
6.1 Overview................................................................................................................................... 47
6.2 Safety messages........................................................................................................................ 47
6.3 Device status information..........................................................................................................48
6.4 Transmitter output.................................................................................................................... 51
6.5 LCD display................................................................................................................................ 52
6.6 Wireless network....................................................................................................................... 52
6.7 Service support..........................................................................................................................53
Appendix A Reference data......................................................................................................... 55
A.1 Product Certifications ............................................................................................................... 55
A.2 Ordering Information, Specifications, and Drawings .................................................................55
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Appendix B Alert Message Mapping............................................................................................57
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Introduction
1 Introduction
1.1 Using this manual
The sections in this manual provide information on installing, operating, and maintaining
the Rosemount 248 Wireless Temperature Transmitter with WirelessHART® protocol. The
sections are organized as follows:
• Configuration provides instruction on commissioning and operating Rosemount 248
Wireless Transmitters. Information on software functions, configuration parameters,
and online variables is also included.
• Installation contains mechanical and electrical installation instructions.
• Commissioning contains techniques for properly commissioning the device.
• Operation and maintenance contains operation and maintenance techniques.
• Troubleshooting provides troubleshooting techniques for the most common operating
problems.
• Reference data supplies links to updated specifications, ordering information, intrinsic
safety approval information, European ATEX directive information, and approval
drawings.
• Alert Message Mapping contains important alerts in the HART® command 48
additional status field for the transmitter.
Rosemount 248 Wireless Transmitter features
• An installation-ready solution that provides a variety of mounting options, transmitter
configurations, and sensors/thermowells
• Flexibility to meet your most demanding applications
• Wireless output with >99 percent data reliability delivers rich HART® data, protected by
industry leading security
• The integral LCD display conveniently shows the primary sensor input and diagnostics
of the transmitter.
• Simple and easy installation practices already used today for robust installations
Refer to the following literature for a full range of compatible connection heads, sensors,
and thermowells provided by Emerson.
• Rosemount 214 Temperature Sensors Product Data Sheet.
• Rosemount 114 Thermowells Product Data Sheet.
1.2 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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8 Emerson.com/Rosemount
Reference Manual Configuration
00809-0100-4248 July 2020
2 Configuration
2.1 Overview
This section contains information on configuration and verification that should be
performed prior to installation.
Field Communicator and AMS Device Manager instructions are given to perform
configuration functions. For convenience, Field Communicator Fast Key sequences are
labeled “Fast Keys” for each software function below the appropriate headings.
Sensor input trim example
Fast Key sequence
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.
Ensure only qualified personnel perform the installation.
Explosions could result in death or serious injury.
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.
Verify that the operating environment of the device is consistent with the appropriate
hazardous locations certifications.
Process leaks may cause harm or result in death.
). 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.
Avoid contact with the leads and terminals. High voltage that may be present on leads can
cause electrical shock.
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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.
2.3 Sensor connections
The Rosemount 248 Wireless Transmitter is compatible with a number of RTD and
thermocouple sensor types. Figure 2-1 shows the correct input connections to the sensor
terminals on the transmitter. To ensure a proper sensor connection, anchor the sensor
lead wires into the appropriate compression terminals and tighten the screws.
Thermocouple or Millivolts inputs
The thermocouple can be connected directly to the transmitter. Use appropriate
thermocouple extension wire if mounting the transmitter remotely from the sensor.
RTD or Ohm inputs
The transmitters will accept a variety of RTD or ohmic configurations, including 2-, 3- or 4wire connections. If the transmitter is mounted remotely from a 3- or 4-wire RTD, it will
operate within specifications, without recalibration, for lead wire resistances of up to 5
ohms per lead (equivalent to 500 feet of 20 AWG wire). In this case, the leads between the
RTD and transmitter should be shielded. If using a 2-wire connection, both RTD leads are
in series with the sensor element, so significant errors can occur if the lead lengths exceed
three feet of 20 AWG wire (approximately 0.05 °C/ft.). For longer runs, attach a third or
fourth lead to achieve a 3- or 4-wire connection as described above.
Effect-RTD input
Since the lead wires are part of the RTD circuit, the lead wire resistance needs to be
compensated for to achieve the best accuracy. This becomes especially critical in
applications where long sensor and/or lead wires are used. There are three lead wire
configurations commonly available. In a two-wire configuration there can be no
compensation for lead wire resistance since the lead wires are in series with the element
and appear to the transmitter as part of the sensor's resistance causing inherent accuracy
degradation. In a 3-wire configuration, compensation is accomplished using the third wire
with the assumption that it will be the same resistance as the other two wires and the
same compensation is applied to all three wires. A 4-wire design is ideal because the lead
wire resistance is inconsequential to the measurement. It uses a measurement technique
where a very small constant current of about 150 micro amps is applied to the sensor
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through two leads and the voltage developed across the sensor is measured over the other
two wires with a high-impedance and high resolution measuring circuit. In accordance
with Ohm's Law, the high impedance virtually eliminates any current flow in the voltage
measurement leads and therefore the resistance of the leads is not a factor.
Table 2-1: Examples of Approximate Basic Error
Sensor input Approximate basic error
4-wire RTD Negligible
3-wire RTD Error in reading is equivalent to unbalanced lead wire resistance
2-wire RTD Error in reading is equivalent to total lead wire resistance
(1) Independent of lead wire resistance up to 5 Ω per lead.
(2) Unbalanced lead wire resistance is the maximum resistance differences between any two leads.
(1)
(2)
Figure 2-1: Sensor Wiring
Thermocouple and mV 4-Wire RTD and Ω
3-Wire RTD and Ω 2-Wire RTD and Ω
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Red
Red
White
White
Red
Red
White
Red
Red
White
Black
Black
Yellow
Configuration Reference Manual
July 2020 00809-0100-4248
Figure 2-2: Sensor Connections
2-wire RTD and Ω 3-wire RTD and Ω 4-wire RTD and Ώ T/C and mV
Note
Emerson provides 4-wire sensors for all single element RTDs. Use these RTDs in 3- or 2wire configurations by leaving the unneeded leads disconnected and insulated with
electrical tape.
Figure 2-3: RTD Lead Wire Configurations per IEC 60751
Single element, 3-wire Single element, 4-wire Dual element, 3-wire
Note
To configure a single element, 4-wire RTD as a 3-wire system, connect only one white lead.
Insulate or terminate the unused white lead in a manner that prevents shorting to the
ground. To configure a single element, 4-wire RTD as a 2-wire system, connect matching
colored wires first and then connect the paired wires to the terminal.
12 Emerson.com/Rosemount
( – )
( + )
( + )
( + )
( – )
( – )
Reference Manual Configuration
00809-0100-4248 July 2020
Figure 2-4: Thermocouple Lead Wire Configurations
Single thermocouple, 2-wire
IEC 60584 thermocouple colors ASTM E- 230 thermocouple colors
Type
POS (+) NEG (-) POS (+) NEG (-)
J Black White White Red
Dual thermocouple, 4-wire
2.3.1
K Green White Yellow Red
T Brown White Blue Red
Note
Dual thermocouple sensors are shipped with one pair of the wires shrink wrapped
together.
Sensor leads
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.
Use the following steps to wire the sensor and supply power to the transmitter:
Procedure
1. Remove the power module cover (if applicable).
2. Remove the transmitter enclosure cover (if applicable).
3. Remove the LCD display (if applicable).
4. Loosen the captive screws and remove LCD adapter plate (if applicable).
5. Attach the sensor leads according to Figure 2-1.
6. Reattach and secure LCD adapter plate to 5 in-lbs of torque (if applicable).
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7. Reattach the LCD display (if applicable).
8. Connect the Green Power Module.
9. Verify the connection by observing the LCD display (if applicable).
10. Reattach and tighten the covers (if applicable).
11. Always ensure a proper seal by installing the covers so that polymer contacts
polymer (i.e. no O-ring visible). Use Rosemount O-rings.
2.4 Bench top configuration
Bench top configuration consists of testing the transmitter and verifying transmitter
configuration data. The wireless temperature transmitters must be configured before
installation, which may be performed either directly or remotely. Direct configuration can
be performed using a Field Communicator, AMS Device Manager, AMS Wireless
Configurator, or any WirelessHART® Communicator. Remote configuration can be
performed using AMS Device Manager, AMS Wireless Configurator, or the Wireless
Gateway.
When using a Field Communicator, any configuration changes made must be sent to the
transmitter by using the Send key (F2). AMS configuration changes are implemented
when the Apply button is clicked.
The power module must be installed to provide power to the Rosemount 248 Wireless for
configuration. 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.
Figure 2-5: Field Communicator Connections
Field Communicator
If performing device configuration directly, connect the bench equipment and turn on the
Field Communicator by pressing the ON/OFF key. When using a Field Communicator, any
configuration changes must be sent to the transmitter by using the Send key (F2).
The Field Communicator will search for a HART®-compatible device and indicate when the
connection is made. If the Field Communicator fails to connect, it will indicate that no
device was found. If this occurs, refer to Troubleshooting.
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AMS Device Manager and AMS Wireless Configurator
When configuring the Rosemount 248 Wireless using AMS Device Manager or AMS
Wireless Configurator, double click the Rosemount 248 Wireless device icon (or right
click and select Con/Setup), then select the Configure Menu. AMS configuration changes
are implemented when the Apply button is clicked.
During direct connection configuration, AMS Device Manager will search for a HARTcompatible device and indicate when the connection is made. If AMS Device Manager fails
to connect, it indicates that no device was found. If this occurs, refer to Troubleshooting.
Emerson Wireless Gateway
The Rosemount 248 Wireless Transmitter supports limited remote configuration through
the Wireless Gateway. The Gateway allows configuration of the following device
parameters: HART Tag, Short Tag, Descriptor, Engineering Units, Update Rate and Range
Values.
Device sensor configuration
Every temperature sensor has unique characteristics. In order to ensure the most accurate
measurement, the transmitter should be configured to match the specific sensor that it
will be connected to. Prior to installation, verify the configuration and connection settings
of the temperature sensor through a Field Communicator or AMS.
Default settings
The Rosemount 248 Wireless default configuration is shown below:
Sensor Type
Engineering Units °C
Number of Lead Wires 4
Network ID Factory generated network parameters
Join Key Factory generated network parameters
Update Rate 1 minute
Pt 100 (α = 0.00385)
Note
The C1 option code can be used to enable factory configuration of the Update Rate, Date,
Descriptor and Message fields. This code is not required to have the factory configure the
Sensor Type, Connection or the Self Organizing Network parameters.
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2.5 Device network configuration
2.5.1 Join to network
Fast Keys 2, 1, 2
In order to communicate with the Wireless Gateway, and ultimately the Host System, the
transmitter must be configured to communicate over the wireless network. This step is
the wireless equivalent of connecting wires from a transmitter to the host system.
Procedure
1. From the Home screen, select 2: Configure.
2. Select 1: Guided Setup.
3. Select 2: Join to Network.
Using a Field Communicator or AMS Device Manager to communicate with the
transmitter, enter the Network ID and Join Key so they match the Network ID and
Join Key of the Wireless Gateway and the other devices in the network. If the
Network ID and Join Key are not identical to those set in the Gateway, the
transmitter will not communicate with the network. The Network ID and Join Key
may be obtained from the Wireless Gateway on the Setup → Network → Settings
page on the web server.
2.5.2
Configure update rate
Fast Keys 2, 1, 3
The Update Rate is the frequency at which a new measurement is taken and transmitted
over the wireless network. This by default is 1 minute. This may be changed at
commissioning, or at any time via AMS Device Manager. The update rate is user selectable
from 1 second to 60 minutes.
Procedure
1. From the Home screen, select 2: Configure.
2. Select 1: Guided Setup.
3. Select 3: Configure Update Rate.
When the device configuration is completed, remove the power module and
replace the module cover. The power module should be inserted only when the
device is ready to be commissioned. Use caution when handling the power module.
16 Emerson.com/Rosemount
1. Overview
2. Cofigure
3.Service Tools
Home
Overview
1. Device Status
2. Comm Status
3. Sensor Value
4. Sensor Status
5. Update rate
6. Join to Network
7. Device Information
Radio
1. MAC Address
2. Manufacturer
3. Device Type
4. Device Revision
5. Software Revision
6. Hardware Revision
7. Transmit PWR Lvl
8. Min Brdcst Updt Rt
Revisions
1. Universal
2. Field Device
3. Software
4. Hardware
5. DD Revisions
1. Tag
2. Long tag
3. Model
4. Final Assembly Number
5. Date
6. Description
7. Message
8. Device ID
9. Model Numbers
10. Device Image
Identification
Device Information
1. Identification
2. Revisions
3. Radio
4. Security
Model Numbers
1. Model Numbers I
2. Model Numbers II
3. Model Numbers III
Security
1. Write Protect
2. Lock Status
3. Over the Air Upgrade
Device Status
1. Refresh Alerts
2. No Active Status
3. F: Electrical Failure
4. F: Terminal Block Failure
5. F: Sensor Failure
6. F: Radio Failure
7. F: Supply Voltage Failure
8. M: Electronics Warming
9. M: Sensor has Exceeded Limits
10. M: Electronics Temperature
has Exceeded Limits
11. M: Terminal Temperature
has Exceeded Limits
12. M: Supply Voltage Low
13. A: Database Memory Warning
14. A: Invalid Configuration
15. A: Hi Hi Alarm
16. A: Hi Alarm
17. A: Lo Alarm
18. A: Lo Lo Alarm
19. A. Simulation Active
If no Active Alerts present, display text
will be “No Active Alerts:
Reference Manual Configuration
00809-0100-4248 July 2020
Figure 2-6: Field Communicator Connections
2.5.3 HART® menu tree
Figure 2-7: Overview
Emerson.com/Rosemount 17
1. Overview
2. Cofigure
3.Service Tools
Home
1. Guided Setup
2. Manual Setup
3. Alert Setup
Configure
1. Configure Sensor
2. Join to Network
3. Configure Update Rate
(3. Configure Adv Brdcsg)
4. Calibrate Sensor
5. Configure Device Display
6. Configure Process Alarm
Guided Setup
1. Upper Sensor Limit
2. Lower Sensor Limit
3. Upper Range Value
4. Lower Range Value
5. Primary Variable
Configuration
1. Sensor
2. Percent of Range
3. Terminal Temperature
4. Electronics Temperature
5. Supply Voltage
Display Items
1. Wireless
2. Sensor
3. Display
4. HART
5. Device Temp
6. Device Information
7. Power
8. Security
Manual Setup
1. Hi-Hi Alarm
2. Hi Alarm
3. Lo Alarm
4. Lo-Lo Alarm
Alert Setup
1. Network ID
2. Join to Network
3. Broadcast Info
Wireless
1. Display Mode
2. Display Items
Display
1. Power Mode
2. Power Source
3. AC Power Filter
Power
1. Write Protect
2. Lock Status
3. Lock/Unlock
4. Over the Air Upgrade
Security
1. Meas Status Log
2. Configure Data Hist
HART
1. Electronics Temp
2. Elect Temp Status
3. Units
4. Maximum
5. Minimum
Device Temperature
1. Tag
2. Long Tag
3. Descriptor
4. Message
5. Date
6. Country
7. SI Unit Control
Device Information
1. Sensor Value
2. Sensor Status
3. % of Range
4. % of Range Status
5. Sensor Setup
6. Configuration
Sensor
Configuration Reference Manual
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Figure 2-8: Configure
18 Emerson.com/Rosemount
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