Reference Manual
00809-0200-4825, Rev AC
March 2022
Rosemount™ 248 Rail Mount Temperature
Transmitter
with RK Option and HART® 7 Protocol
NOTICE
Read this manual before working with the product. For personal and system safety, and for optimum product performance, make
sure to thoroughly understand the contents before installing, using, or maintaining this product.
The United States has two toll-free assistance numbers and one international number.
Customer Central
National Response Center
International
1 800 999 9307 (7:00 am to 7:00 pm CST)
1 800 654 7768 (24 hours a day) Equipment service needs
1 952 906 8888
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 an 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.
Do not remove the housing covers in explosive atmospheres when the circuit is live.
Before connecting a handheld 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 atmosphere of the transmitter is consistent with the appropriate hazardous locations certifications.
All connection head covers must be fully engaged to meet explosion-proof requirements.
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.
Electrical shock could cause death or serious injury.
Use extreme caution when making contact with the leads and terminals.
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.
2
Reference Manual Contents
00809-0200-4825 March 2022
Contents
Chapter 1 Introduction.............................................................................................................. 5
1.1 Using this manual........................................................................................................................ 5
1.2 Transmitter overview...................................................................................................................5
1.3 Mounting, installation, and programming................................................................................... 5
1.4 Product recycling/disposal...........................................................................................................6
Chapter 2 Installation.................................................................................................................7
2.1 Safety messages.......................................................................................................................... 7
2.2 Connections................................................................................................................................ 8
2.3 Multidrop mode...........................................................................................................................8
Chapter 3 Configuration............................................................................................................ 9
3.1 Safety messages.......................................................................................................................... 9
3.2 Configuration methods................................................................................................................9
Chapter 4 Operation and Maintenance.....................................................................................11
4.1 Safety messages........................................................................................................................ 11
4.2 LED functionality........................................................................................................................11
4.3 Jumpers..................................................................................................................................... 12
4.4 Test pins.................................................................................................................................... 12
4.5 HART® commands..................................................................................................................... 12
Chapter 5 Troubleshooting...................................................................................................... 15
5.1 Primary value out of limits......................................................................................................... 15
5.2 Non-primary variable out of limits..............................................................................................15
5.3 Loop current saturated.............................................................................................................. 15
5.4 Primary sensor 1 error................................................................................................................15
5.5 CJC for input 1 error (only if used).............................................................................................. 15
5.6 Configuration not supported by device......................................................................................16
5.7 Electronic temperature out of limits.......................................................................................... 16
5.8 Power supply voltage issues.......................................................................................................16
5.9 Electronics failure...................................................................................................................... 16
5.10 Electronics failure.................................................................................................................... 17
5.11 Power supply voltage issues.....................................................................................................17
5.12 Loop current read back error....................................................................................................17
5.13 Power supply voltage issues.....................................................................................................17
5.14 Electronics failure.................................................................................................................... 17
5.15 Electronics failure.................................................................................................................... 18
5.16 Electronics failure.................................................................................................................... 18
5.17 Electronics failure.................................................................................................................... 18
Emerson.com/Rosemount 3
Contents Reference Manual
March 2022 00809-0200-4825
5.18 Watchdog reset executed........................................................................................................18
5.19 Internal RTD sensor error......................................................................................................... 19
5.20 Sensor failure...........................................................................................................................19
5.21 Sensor measurement error...................................................................................................... 19
5.22 Sensor measurement error...................................................................................................... 19
Appendix A Reference Data.........................................................................................................21
A.1 Product certifications................................................................................................................ 21
A.2 Ordering Information, Specifications, and Drawings..................................................................21
A.3 Dimensional drawings............................................................................................................... 22
4 Rosemount 248R
Reference Manual
00809-0200-4825 March 2022
Introduction
1 Introduction
1.1 Using this manual
This manual is designed to assist in the installation, operation, and maintenance of the
Rosemount™ 248R Next Gen Temperature Transmitter.
• Installation
• Configuration
• Operation and maintenance
• Troubleshooting
• Reference data
1.2 Transmitter overview
The transmitter supports the following features:
• 4-20 mA/HART® protocol (Revision 7).
• Acceptance of inputs from a wide variety of RTD and thermocouple.
• Improve measurement accuracy with Transmitter-Sensor matching.
• Meets NAMUR NE21, NE43, NE44, NE89 and NE107 compliant diagnostics information.
Refer to the following literature for a full range of compatible connection heads, sensors,
and thermowells provided by Emerson:
• Rosemount 214C Temperature Sensors Product Data Sheet
• Rosemount Volume 1 Temperature Sensors and Accessories (English) Product Data
Sheet
• Rosemount DIN-Style Temperature Sensors and Thermowells (Metric) Product Data
Sheet
Table 1-1: Change Summary: Rosemount 248 Rail Mount HART Device Revision
Release date NAMUR
software
revision
May 2021 01.05.10 01.05.10 7 00809-0200-4825
(1) NAMUR software revision is located on the hardware tag of the device. HART software revision
can be read using a HART communication tool.
NAMUR
hardware
revision
HART software
revision
(1)
Manual document
number
1.3 Mounting, installation, and programming
• DIN rail mounting with up to 42 inputs per meter.
Emerson.com/Rosemount 5
Introduction Reference Manual
March 2022 00809-0200-4825
• Communication via Asset Management tool (e.g. Pactware, AMS, HART
communicator) for which all relevant DD, eDD and DTM files are available.
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.
®
6 Rosemount 248R
Reference Manual Installation
00809-0200-4825 March 2022
2 Installation
2.1 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 ( ). Please refer to the following safety
messages 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.
Do not remove the housing covers in explosive atmospheres when the circuit is live.
Before connecting a handheld 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 atmosphere of the transmitter is consistent with the
appropriate hazardous locations certifications.
All connection head covers must be fully engaged to meet explosion-proof
requirements.
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.
Electrical shock could cause death or serious injury.
Use extreme caution when making contact with the leads and terminals.
Emerson.com/Rosemount 7
42 44
43
41
43
I1
41 42 44
43
+
-
CJC
3
41 42 44
43
+
41 42 44
43
4
I1
B
C
D
+
-
+
-
A
E
F F
F
Installation Reference Manual
March 2022 00809-0200-4825
2.2 Connections
Single input
2 w / 3 w / 4 w RTD or
lin. R
TC (internal CJC or
external 2 w / 3 w / 4 w
(1) When using thermocouple input, the transmitter can be configured for either constant, internal
or external CJC via a Pt100 or Ni100 sensor. This must be selected during device configuration.
2.3 Multidrop mode
The communication is either by means of a HART® communicator or a HART modem.
The HART communicator or a HART modem can be connected across BC or CD.
The outputs of maximum 63 transmitters can be connected in parallel for a digital HART 2wire communication.
Before it is connected, each transmitter must be configured with a unique number from 1
to 63. If two transmitters are configured with the same number, both will be excluded. The
transmitters must be programmed for multidrop mode (with a fixed output signal of 4
mA). Maximum current in the loop is therefore 252 mA.
CJC)
(1)
mV 3 w / 4 w
potentiometer
A. Power supply
B. Connection
C. Connection
D. Connection
E. 250 Ω < R
< 1100 Ω
load
F. Transmitter
8 Rosemount 248R
Reference Manual Configuration
00809-0200-4825 March 2022
3 Configuration
3.1 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 ( ). Please refer to the following safety
messages 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.
Do not remove the housing covers in explosive atmospheres when the circuit is live.
Before connecting a handheld 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 atmosphere of the transmitter is consistent with the
appropriate hazardous locations certifications.
All connection head covers must be fully engaged to meet explosion-proof
requirements.
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.
Electrical shock could cause death or serious injury.
Use extreme caution when making contact with the leads and terminals.
3.2 Configuration methods
The device can be configured in the following ways:
• With a HART® communicator with Emerson's DDL driver
• Via programming framework (e.g. AMS Device Manager, DCS, PACTware™)
HART communicator
To get access to product-specific commands, the HART communicator must be loaded
with Emerson's DDL driver. This can be ordered through either the FieldComm Group or
Emerson.
Emerson.com/Rosemount 9
4
4
4
3
4
2
41
51
1
1
1
2
1
3
1
4
12
11
A
B
C
D
E
F
G
1211+
-
44
4
3
4
2
4
1
5
1
1
1
1
2
1
3
1
4
A
B
D
C
Configuration Reference Manual
March 2022 00809-0200-4825
A. Rosemount transmitter
B. Ex area
C. Safe area
D. 250 Ω < R
< 1100 Ω
load
E. Receiving equipment
F. +V supply
G. Input
Programming framework
Support for both EDD and FDT®/DTM™ technology, offering configuration and monitoring
via relevant DCS/Asset Management Systems and supported management packages (e.g.
PACTware).
A. Rosemount transmitter
B. 250 Ω < R
< 1100 Ω
load
C. Process computer
D. DCS, etc.
10 Rosemount 248R
Reference Manual Operation and Maintenance
00809-0200-4825 March 2022
4 Operation and Maintenance
4.1 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 ( ). Please refer to the following safety
messages 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.
Do not remove the housing covers in explosive atmospheres when the circuit is live.
Before connecting a handheld 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 atmosphere of the transmitter is consistent with the
appropriate hazardous locations certifications.
All connection head covers must be fully engaged to meet explosion-proof
requirements.
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.
Electrical shock could cause death or serious injury.
Use extreme caution when making contact with the leads and terminals.
4.2 LED functionality
Onboard LED indicates faults according to NAMUR NE44 and NE107.
Condition
Device OK Constant green
No supply Off
Fault indication independent of the device (e.g. wire break,
sensor short circuit, violation of input or output limits)
Device error Constant red
LED status
Flashing red
Emerson.com/Rosemount 11
Operation and Maintenance Reference Manual
March 2022 00809-0200-4825
4.3 Jumpers
The Rosemount 248R Transmitters have two front jumpers: one to enable Write
Protection and one to select the output current at Safe State to go above 21 mA as
specified in NAMUR NE43.
If the jumper is not inserted, the output current at Safe State will go lower than 3.6 mA as
specified in NAMUR NE43.
Write protect Safe state > 21 mA No function No function
4.4 Test pins
The test pins allow measurement of loop current directly while maintaining loop integrity.
Power must be connected to the transmitter (terminals 11 and 12) when using the test
pins (terminals 13 and 14).
CAUTION
For hazardous area installation, only certified test equipment may be used.
4.5 HART® commands
For definitions and further information on HART commands, consult the HART Field
Device Specification.
Table 4-1: Advanced functions
Function Description
Customized
linearization polynomial
type
Supports polynomial linearization up to five segments, each with up to 4th order
polynomials.
12 Rosemount 248R
Reference Manual Operation and Maintenance
00809-0200-4825 March 2022
Table 4-1: Advanced functions (continued)
Function Description
Customized
linearization Callendar Van
Dusen
Customized
linearization table
linearization
Customized
linearization 2nd order
spline
linearization
Runtime
meter transmitter
electronics
Runtime
meter Sensors
Slave pointer transmitter
electronics
Slave pointer Sensors
(1)
Supports direct entry of CVD constants.
Supports table linearization with up to 60 in/out values.
Supports 2nd order spline linearization with up to 40 output values.
< -50 °C
-50...-30 °C
-30...-10 °C
Recording of Sensor measurement values during operation, logging time spent in
each of nine fixed sub Sensor ranges.
Subranges are defined individually for each Sensor type.
Recording of minimum/maximum internal transmitter temperature for device’s
complete lifetime.
Recording of minimum/maximum values for Sensor/s measurements is saved.
Values are reset when measurement configuration is changed.
-10...+10 °C
+10...+30 °C
+30...+50 °C
+50...+70 °C
+70...+85 °C
>85 °C
(1) Recording of internal transmitter temperatures during operation, logging time spent in each of
nine fixed sub temperature ranges.
Dynamic variable mapping
Four dynamic variables are supported, PV, SV, TV, and QV.
Using HART commands, these may be assigned to the Device Variables shown in the table
below.
The device variable mapped to PV controls the loop current.
Input Type
Single Sensor
Sensor 1 Electronics Temperature
PV SV, TV, QV
Write protection by software
The default active password when the device leaves the factory is ‘********’; this value
can be changed by the user.
The universal active password “00002008” will always be accepted and this value cannot
be changed. The universal active password shall only be used if the active password has
been lost and needs to be reset to a known value.
Emerson.com/Rosemount 13
Operation and Maintenance Reference Manual
March 2022 00809-0200-4825
When changing the password, use only Latin-1 characters that can be entered and
displayed on any terminal.
When write protection is enabled, no “write” commands are accepted regardless of the
“Write Protect” hardware jumper position.
Write protection by jumper
If a hardware jumper is set in “Write Protect” position, no “write” commands are accepted
even if disabled by software.
14 Rosemount 248R
Reference Manual Troubleshooting
00809-0200-4825 March 2022
5 Troubleshooting
5.1 Primary value out of limits
LED status: flashing red
The device variable mapped to PV (and Analog Output Current) is beyond its operating
limits.
Recommended action
Reconnect or repair sensor.
5.2 Non-primary variable out of limits
LED status: flashing red
Any other device variable is beyond its operating limits.
Recommended action
Reconnect or repair sensor.
5.3 Loop current saturated
LED status: flashing red
The loop current has reached the Current Output Upper Limit (UL) or Output Lower Limit
(LL) as configured, and is no longer corresponding to the PV value.
Recommended action
Reconnect or repair sensor.
5.4 Primary sensor 1 error
LED status: flashing red
A sensor error (broken/shorted sensor) is detected on Sensor 1.
Recommended action
Reconnect or repair sensor.
5.5 CJC for input 1 error (only if used)
LED status: flashing red
A sensor error (broken/shorted sensor) is detected on the CJC measurement used for input
1.
Emerson.com/Rosemount 15
Troubleshooting Reference Manual
March 2022 00809-0200-4825
Recommended action
Reconnect or repair sensor.
5.6 Configuration not supported by device
LED status: solid red
Configuration is temporary invalid < 3 seconds, e.g. while downloading parameters.
Recommended action
Correct and re-send the configuration.
5.7 Electronic temperature out of limits
LED status: flashing red
The device is operated outside its specified temperature range.
Recommended action
Check operating temperature.
LED status: solid red
The device is operated outside its specified temperature range in SIL mode.
Recommended action
Check operating temperature.
5.8 Power supply voltage issues
LED status: off
Power is applied but still too low.
Recommended action
1. Check power supply (at output terminals).
2. If the error is persistent send the device for evaluation or replace the device.
5.9 Electronics failure
LED status: solid red
An unrecoverable error occurred in the internal communication to the input CPU.
Recommended action
1. Reset or re-power the device.
2. If the error is persistent send the device for evaluation or replace the device.
16 Rosemount 248R
Reference Manual Troubleshooting
00809-0200-4825 March 2022
5.10 Electronics failure
LED status: solid red
An unrecoverable error occurred in the input CPU.
Recommended action
1. Reset or re-power the device.
2. If the error is persistent send the device for evaluation or replace the device.
5.11 Power supply voltage issues
LED status: solid red
The device is operated below its specified voltage supply range.
Recommended action
1. Check power supply (at output terminals). Reset or re-power the device.
2. If the error is persistent send the device for evaluation or replace the device.
5.12 Loop current read back error
LED status: solid red
The read back loop current differs from the calculated output current.
Recommended actions
1. Check power supply (at output terminals). Reset or re-power the device.
2. If the error is persistent send the device for evaluation or replace the device.
5.13 Power supply voltage issues
LED status: solid red
The device is operated above its specified voltage supply range.
Recommended actions
1. Check power supply (at output terminals). Reset or re-power the device.
2. If the error is persistent send the device for evaluation or replace the device.
5.14 Electronics failure
LED status: solid red
The configuration in the NVM has become inconsistent.
Emerson.com/Rosemount 17
Troubleshooting Reference Manual
March 2022 00809-0200-4825
Recommended action
1. Correct and/or re-send the configuration.
2. If the error is persistent send the device for evaluation or replace the device.
5.15 Electronics failure
LED status: solid red
An unrecoverable error occurred in the internal communication to the EEPROM.
Recommended action
1. Reset or re-power the device.
2. If the error is persistent send in the device for evaluation and replace the device.
5.16 Electronics failure
LED status: solid red
An unrecoverable memory error occurred in the internal main CPU.
Recommended action
1. Reset or re-power the device.
2. If the error is persistent send the device for evaluation or replace the device.
5.17 Electronics failure
LED status: solid red
An exception error occurred in the main CPU program execution.
Recommended action
1. Reset or re-power the device.
2. If the error is persistent send the device for evaluation or replace the device.
5.18 Watchdog reset executed
LED status: solid red
The main program was reset unintentionally due to a failed code execution.
Recommended action
Correct and/or re-send the configuration.
18 Rosemount 248R
Reference Manual Troubleshooting
00809-0200-4825 March 2022
5.19 Internal RTD sensor error
LED status: solid red
Sensor error is detected on the internal temperature sensor.
Recommended action
Reset or re-power the device.
5.20 Sensor failure
LED status: flashing red
A critical measurement error is detected on internal voltage reference.
Recommended action
1. Reconnect or repair sensor.
2. If the error is persistent send the device for evaluation or replace the device.
5.21 Sensor measurement error
LED status: flashing red
A critical measurement error is detected on Sensor 1.
Recommended action
1. Reconnect or repair sensor.
2. If the error is persistent send the device for evaluation or replace the device.
5.22 Sensor measurement error
LED status: flashing red
A critical measurement error is detected on the ground measurement.
Recommended actions
1. Reconnect or repair sensor.
2. If the error is persistent send the device for evaluation or replace the device.
Emerson.com/Rosemount 19
Troubleshooting Reference Manual
March 2022 00809-0200-4825
20 Rosemount 248R
Reference Manual Reference Data
00809-0200-4825 March 2022
A Reference Data
A.1 Product certifications
To view current Rosemount™ 248 Temperature Transmitter Product Certifications, follow
these steps:
Procedure
1. Go to Emerson.com/Rosemount/Rosemount-248.
2. Scroll as needed to the green menu bar and click Documents & Drawings.
3. Click Manuals & Guides.
4. Select the appropriate Quick Start Guide.
A.2 Ordering Information, Specifications, and
Drawings
To view current Rosemount 248 Ordering information, Specifications, and Drawings,
follow these steps:
Procedure
1. Go to Emerson.com/Rosemount/Rosemount-248.
2. Scroll as needed to the green menu bar and click Documents & Drawings.
3. For installation drawings, click Drawings & Schematics and select the appropriate
document.
4. For ordering information, specifications, and dimensional drawings, click Data
Sheets & Bulletins.
5. Select the appropriate Product Data Sheet.
Emerson.com/Rosemount 21
Reference Data Reference Manual
March 2022 00809-0200-4825
A.3 Dimensional drawings
Figure A-1: Rosemount 248R Rail Mount RK Option
Dimensions are in inches (millimeters).
22 Rosemount 248R
Reference Manual
00809-0200-4825 March 2022
Emerson.com/Rosemount 23
00809-0200-4825
Rev. AC
2022
For more information:
©
2022 Emerson. All rights reserved.
Emerson.com
Emerson Terms and Conditions of Sale are available upon
request. The Emerson logo is a trademark and service mark of
Emerson Electric Co. Rosemount is a mark of one of the
Emerson family of companies. All other marks are the property
of their respective owners.
Loading...