EMERSON Rosemount 248 Rail Mount Temperature Transmitter User Guide

: June 4, 2024
: Emerson

Table of Contents

Rosemount 248 Rail Mount Temperature Transmitter
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Rosemount 248 Rail Mount Temperature Transmitter

Quick Start Guide 00825-0300-4825, Rev BA
June 2022
RosemountTM 248 Rail Mount Temperature Transmitter
with RK Option and HART® 7 Protocol

Quick Start Guide

June 2022

Contents About this guide……………………………………………………………………………………………………………3 Installation………………………………………………………………………………………………………………….. 5 Configuration………………………………………………………………………………………………………………. 8 Mount the transmitter………………………………………………………………………………………………….10 Product certifications………………………………………………………………………………………………….. 12 China RoHS……………………………………………………………………………………………………………….. 25

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1 About this guide
This guide provides basic guidelines to install the Rosemount 248R Rail Mount Temperature Transmitter. It does not provide instructions for detailed configuration, diagnostics, maintenance, service, troubleshooting, or installations. Refer to the Rosemount 248R 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
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 housing use a ½14 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
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.

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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 explosionproof 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.

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2.2 Connections

Single input

2 w / 3 w / 4 w RTD TC (internal CJC or

mV

or lin. R

external 2 w / 3 w /

4 w CJC)(1)

41 42 43 44

3 w / 4 w potentiometer
41 42 43 44

3 I1 4

3 CJC

–

4 I1

(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 2-wire 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.

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+B

A

-C
E
D
–
A. Power supply B. Connection C. Connection D. Connection E. 250 < Rload < 1100 F. Transmitter

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F

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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 explosionproof 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, PACTwareTM)

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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.

B

C

11 12 13 14

12 11

E F G
D

51

41 42 43 4 4

A

A. Rosemount transmitter B. Ex area C. Safe area D. 250 < Rload < 1100 E. Receiving equipment F. +V supply G. Input

Programming framework
Support for both EDD and FDT®/DTMTM technology, offering configuration and monitoring via relevant DCS/Asset Management Systems and supported management packages (e.g. PACTware).

11 12 13 14

C

+ 12 – 11

51

41 42 43 4 4

A

B D

A. Rosemount transmitter
B. 250 < Rload < 1100 C. Process computer
D. DCS, etc.

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4 Mount the transmitter

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4.1
4.1.1
4.2

Rail mount transmitter with remote mount sensor
The least complicated assembly uses: · a remote mounted transmitter
· an integral mount sensor with terminal block
· an integral style connection head
· a standard extension
· a threaded thermowell
Refer to the Metric Sensor Product Data Sheet for complete sensor and mounting accessory information.
Assemble the device To complete the assembly:
Procedure 1. Attach the transmitter to a suitable rail or panel. 2. Attach the thermowell to the pipe or process container wall. Install and tighten the thermowell before applying pressure. 3. Attach the sensor to the connection head and mount the entire assembly to the thermowell. 4. Attach sufficient lengths of sensor lead wire to the sensor terminal block. 5. Attach and tighten the connection head cover. Enclosure covers must be fully engaged to meet explosion-proof requirements. 6. Run sensor lead wires from the sensor assembly to the transmitter. 7. Attach the sensor and power leads to the transmitter. Avoid contact with leads and terminals.
Rail mount transmitter with threaded sensor
The least complicated assembly uses: · a threaded sensor with flying heads
· a threaded sensor connection head
· a union and nipple extension assembly
· a threaded thermowell

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4.2.1

Refer to Rosemount Metric Sensor Product Data Sheet for complete sensor and mounting accessory information.
Assemble the device
To complete the assembly:
Procedure
1. Attach the transmitter to a suitable rail or panel. 2. Attach the thermowell to the pipe or process container wall. Install
and tighten the thermowell before applying pressure. 3. Attach necessary extension nipples and adapters. Seal the nipple and
adapter threads with silicone tape. 4. Twist the sensor into the thermowell. Install drain seals if required for
severe environments or to satisfy code requirements. 5. Screw the connection head to the sensor. 6. Attach the sensor lead wires to the connection head terminals. 7. Attach additional sensor lead wires from the connection head to the
transmitter. 8. Attach and tighten the connection head cover. Enclosure covers
must be fully engaged to meet explosion-proof requirements. 9. Attach the sensor and power leads to the transmitter. Avoid contact
with leads and terminals.

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5 Product certifications

5.1 5.2
5.3
5.4
5.4.1

Rev: 1.1

European Directive information
A copy of the EU Declaration of Conformity can be found at the end of the Quick Start Guide. The most recent revision of the EU Declaration of Conformity can be found at Emerson.com/Rosemount.

Ordinary location certification
As standard, the transmitter has been examined and tested to determine that the design meets the basic electrical, mechanical, and fire protection requirements by a nationally recognized test laboratory (NRTL) as accredited by the Federal Occupational Safety and Health Administration (OSHA).

Installing equipment in North America
The US National Electrical Code® (NEC) and the Canadian Electrical Code (CEC) permit the use of Division marked equipment in Zones and Zone marked equipment in Divisions. The markings must be suitable for the area classification, gas, and temperature class. This information is clearly defined in the respective codes.

USA
I5 USA Intrinsically Safe (IS) and Division 2/Zone 2

Certificate 80072530

Standards UL Std No 913 Ed. 8, UL 60079-0 Ed. 5, UL 60079-11 Ed. 6, UL 60079-15 Ed. 4, UL 61010-1 Ed. 3

Markings

Class I, Division 1, Groups A, B, C, D Class I, Zone 0: AEx ia IIC T6…T4 Class I, Zone 1: AEx ib [ia] IIC T6…T4 Class I, Division 2, Groups A, B, C, D Class I, Zone 2: AEx nA IIC T6…T4 Class I, Zone 2: AEx nA [ic] IIC T6…T4 when installed per Control Drawing 00248-8000

Table 5-1: IS Input Parameters vs Temperature Range

Input parameters (Terminals 11, 12)
Ui: 30 VDC

Temperature range
T4: -50 °C Ta +85 °C

Input parameters (Terminals 11, 12)
Ui: 30 VDC

Temperature range
T4: -50 °C Ta +85 °C

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Table 5-1: IS Input Parameters vs Temperature Range (continued)

Input parameters (Terminals 11, 12)
Ii: 120 mA
Pi: 900 mW
Li: 0 uH Ci: 1.0 nF

Temperature range
T5: -50 °C Ta +70 °C
T6: -50 °C Ta +55 °C N/A N/A

Input parameters (Terminals 11, 12)
Ii: 100 mA
Pi: 750 mW
Li: 0 uH Ci: 1.0 nF

Temperature range
T5: -50 °C Ta +75 °C
T6: -50 °C Ta +60 °C N/A N/A

Table 5-2: IS Output Parameters per Terminal Configuration

Parameters
Uo Io Po Lo Co

One sensor using all

Sensor using one set of

output terminals (41-54) output terminals (41-44

or 51-54)

7.2 VDC

12.9 mA

7.3 mA

23.3 mW

13.2 mW

200 mH

667 mH

13.5 uF

Table 5-3: Division 2/Zone 2 Input Parameters vs Temperature Range

Supply voltage 37 VDC max
30 VDC max
NIFW Vmax = 30 VDC, Ci = 1 nF, Li = 0

Temperature range
T4: -50 °C Ta +85 °C T5: -50 °C Ta +70 °C T6: -50 °C Ta +55 °C
T4: -50 °C Ta +85 °C T5: -50 °C Ta +75 °C T6: -50 °C Ta +60 °C
T4: -50 °C Ta +85 °C T5: -50 °C Ta +75 °C T6: -50 °C Ta +60 °C

Special Conditions for Safe Use (X):
1. Install per Installation Drawing 00248-8000 as appropriate.
2. Install in accordance with the US National Electrical Code (NEC) for the US and in accordance with the Canadian Electrical Code (CEC) for Canada.

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3. The transmitter must be installed in suitable enclosure to meet installation codes stipulated in the Canadian Electrical Code (CEC) or for the US the National Electrical Code (NEC).
4. If the enclosure is made of non-metallic materials or of painted metal, electrostatic charging shall be avoided.
5. For Div 2/Zone 2 applications, the transmitter must be installed in an enclosure providing a degree of protection of at least IP54 according to IEC60529 that is suitable for the application and is correctly installed. Cable entry devices and blanking elements shall fulfil the same requirements.
6. Use supply wires with a rating of at least 5 K above the ambient temperature.
7. For Div 2/Zone 2 applications, the temperature transmitter requires connecting to Class 2 Power Supply with Transient protection. See installation drawing as appropriate.

5.5
5.5.1

Canada
I6 Canada Intrinsically Safe (IS) and Division 2/Zone 2

Certificate: 80072530

Standards: CSA C22.2 No. 157-92 (R2012), CAN/CSA C22.2 No. 60079-0:11, CAN/CSA C22.2 No. 60079-11:11, CAN/CSA C22.2 No. 60079-15:12, CSA 61010-1-12

Markings:

Class I, Division 1, Groups A, B, C, D Ex ia IIC T6…T4 Ex ib [ia] IIC T6…T4 Class I, Division 2, Groups A, B, C, D Ex nA IIC T6…T4 Ex nA [ic] IIC T6…T4 when installed per Control Drawing 00248-8000

Table 5-4: IS Input Parameters vs Temperature Range

Input parameters (Terminals 11, 12)
Ui: 30 VDC
Ii: 120 mA
Pi: 900 mW

Temperature range
T4: -50 °C Ta +85 °C
T5: -50 °C Ta +70 °C
T6: -50 °C Ta +55 °C

Input parameters (Terminals 11, 12)
Ui: 30 VDC
Ii: 100 mA
Pi: 750 mW

Temperature range
T4: -50 °C Ta +85 °C
T5: -50 °C Ta +75 °C
T6: -50 °C Ta +60 °C

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Table 5-4: IS Input Parameters vs Temperature Range (continued)

Input parameters (Terminals 11, 12)
Li: 0 uH
Ci: 1.0 nF

Temperature range
N/A
N/A

Input parameters (Terminals 11, 12)
Li: 0 uH
Ci: 1.0 nF

Temperature range
N/A
N/A

Table 5-5: IS Output Parameters per Terminal Configuration

Parameters
Uo Io Po Lo Co

One sensor using all

Sensor using one set of

output terminals (41-54) output terminals (41-44

or 51-54)

7.2 VDC

12.9 mA

7.3 mA

23.3 mW

13.2 mW

200 mH

667 mH

13.5 uF

Table 5-6: Division 2/Zone 2 Input Parameters vs Temperature Range

Supply voltage 37 VDC max
30 VDC max
NIFW Vmax = 30 VDC, Ci = 1 nF, Li = 0

Temperature range
T4: -50 °C Ta +85 °C T5: -50 °C Ta +70 °C T6: -50 °C Ta +55 °C
T4: -50 °C Ta +85 °C T5: -50 °C Ta +75 °C T6: -50 °C Ta +60 °C
T4: -50 °C Ta +85 °C T5: -50 °C Ta +75 °C T6: -50 °C Ta +60 °C

Special Conditions for Safe Use (X):
1. Install per Installation Drawing 00248-8000 as appropriate.
2. Install in accordance with the US National Electrical Code (NEC) for the US and in accordance with the Canadian Electrical Code (CEC) for Canada.
3. The transmitter must be installed in suitable enclosure to meet installation codes stipulated in the Canadian Electrical Code (CEC) or for the US the National Electrical Code (NEC).

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4. If the enclosure is made of non-metallic materials or of painted metal, electrostatic charging shall be avoided.
5. For Div 2/Zone 2 applications, the transmitter must be installed in an enclosure providing a degree of protection of at least IP54 according to IEC60529 that is suitable for the application and is correctly installed. Cable entry devices and blanking elements shall fulfil the same requirements.
6. Use supply wires with a rating of at least 5 K above the ambient temperature.
7. For Div 2/Zone 2 applications, the temperature transmitter requires connecting to Class 2 Power Supply with Transient protection. See installation drawing as appropriate.

5.6
5.6.1

Europe
I1 ATEX Intrinsic Safety

Certificate: Standards: Markings:

DEKRA 21ATEX0003X
EN60079-0:2012+A11:2013, EN60079-11:2012
II 1 G Ex ia IIC T6…T4 Ga II 2(1) G Ex ib [ia Ga] IIC T6…T4 Gb II 1 D Ex ia IIIC Da I 1 M Ex ia I Ma when installed per Control Drawing 00248-8001

Input parameters (Power terminals)
Ui: 30 VDC Ii: 120 mA Pi: See table below Li: 0 uH Ci: 1.0 nF

Output parameters (Sensor terminals)
Uo: 7.2 VDC Io: 7.3 mA Po: 13.2 mW Lo: 667 mH Co: 13.5 uF

Pi per Channel 900 mW
750 mW

Temperature class
T6 T5 T4 T6

Maximum ambient temperature +50 °C +65 °C +85 °C +55 °C

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Pi per Channel 610 mW

Temperature class
T5 T4 T6 T5 T4

Maximum ambient temperature +70 °C +85 °C +60 °C +75 °C +85 °C

5.6.2

Special Conditions for Safe Use (X):
1. For all potentially explosive atmospheres, if the enclosure is made of non-metallic materials, or if it is made of metal having a paint layer thicker than 0.2 mm (group IIC), or 2 mm (group IIB, IIA, I), or any thickness (group III), electrostatic charges shall be avoided.
2. For EPL Ga, if the enclosure is made of aluminum, it must be installed such that ignition sources due to impact and friction sparks are excluded.
3. For EPL Da, the surface temperature “T” of the enclosure, for a dust layer with a maximum thickness of 5 mm, is the ambient temperature +20 K.
N1 ATEX Zone 2

Certificate: DEKRA 21ATEX0004X

Standards: EN60079-0:2012+A11:2013, EN60079-7:2015+A1:2018, EN60079-11:2012, EN60079-15:2010

Markings:

II 3 G Ex nA IIC T6…T4 Gc II 3 G Ex ec IIC T6…T4 Gc II 3 G Ex ic IIC T6…T4 Gc II 3 D Ex ic IIIC Dc when installed per Control Drawing 00248-8001

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Supply/input to transmitter

Ex nA & Ex ec

Ex ic
Li = 0 µH Ci = 1.0 nF

Vmax = 37 VDC Ui = 37 VDC

Vmax = 30 VDC Ui = 30 VDC

Ex ic Ui = 48 VDC Li = 0 µH Ci = 1.0 nF Pi = 851 mW per channel
Pi = 700 mW per channel

Temperature class

Maximum ambient temperature
Single and dual input

T4

+85 °C

T5

+70 °C

T6

+55 °C

T4

+85 °C

T5

+75 °C

T6

+60 °C

Table 5-7: Maximum Output of Transmitter

Ex nA & Ex ec Vmax = 7.2 VDC

Ex ic
Uo = 7.2 VDC Io = 7.3 mA Po = 13.2 mW Lo = 667 mH Co = 13.5 µF

Special Conditions for Safe Use (X):
1. For all potentially explosive atmospheres, if the enclosure is made of non-metallic materials, or if it is made of metal having a paint layer thicker than 0.2mm (group IIC), or 2mm (group IIB, IIA, I), or any thickness (group III), electrostatic charges shall be avoided.
2. The transmitter shall be installed in an enclosure providing a degree of protection of not less than IP54 in accordance with EN 60079-0, which is suitable for the application and correctly installed, e.g. in an enclosure that is in type of protection Ex n or Ex e.
3. Additional, for Ex nA or Ex ec, the area inside the enclosure shall be pollution degree 2 or better, as defined in EN 60664-1.
4. For EPL Dc, the surface temperature “T” of the enclosure, for a dust layer with a maximum thickness of 5mm, is the ambient temperature +20K.

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5.7
5.7.1

International
I7 IECEx Intrinsic Safety

Certificate Standards Markings

IECEx DEK 21.0002X
IEC 60079-0:2011, IEC 60079-11:2011
Ex ia IIC T6…T4 Ga Ex ib [ia Ga] IIC T6…T4 Gb Ex ia IIIC Da Ex ia I Ma when installed per Control Drawing 00248-8002

Input parameters (Power terminals)
Ui: 30 VDC Ii: 120 mA Pi: See table below Li: 0 uH Ci: 1.0 nF

Output parameters (Sensor terminals)
Uo: 7.2 VDC Io: 7.3 mA Po: 13.2 mW Lo: 667 mH Co: 13.5 uF

Pi per channel 900 mW 750 mW 610 mW

Temperature class
T6 T5 T4 T6 T5 T4 T6 T5 T4

Maximum ambient temperature
+50 °C +65 °C +85 °C +55 °C +70 °C +85 °C +60 °C +75 °C +85 °C

Special Conditions for Safe Use (X):
1. For all potentially explosive atmospheres, if the enclosure is made of non-metallic materials, or if it is made of metal having a paint layer

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5.7.2

thicker than 0.2 mm (group IIC), or 2 mm (group IIB, IIA, I), or any thickness (group III), electrostatic charges shall be avoided.
2. For EPL Ga, if the enclosure is made of aluminum, it must be installed such that ignition sources due to impact and friction sparks are excluded.
3. For EPL Da, the surface temperature “T” of the enclosure, for a dust layer with a maximum thickness of 5 mm, is the ambient temperature +20 K.
N7 IECEx Zone 2

Certificate: IECEx DEK 21.0002X

Standards: IEC 60079-0:2011, IEC 60079-7:2017, IEC 60079-11:2011, IEC 60079-15:2010

Markings:

Ex nA IIC T6…T4 Gc Ex ec IIC T6…T4 Gc Ex ic IIC T6…T4 Gc Ex ic IIIC Dc when installed per Control Drawing 00248-8002

Supply/input to transmitter

Ex nA & Ex ec

Ex ic
Li = 0 µH Ci = 1.0 nF

Vmax = 37 VDC

Ui = 37 VDC

Vmax = 30 VDC

Ui = 30 VDC

Ex ic Ui = 48 VDC Li = 0 µH Ci = 1.0 nF Pi = 851 mW per channel
Pi = 700 mW per channel

Temperature class

Maximum ambient temperature
Single and dual input

T4

+85 °C

T5

+70 °C

T6

+55 °C

T4

+85 °C

T5

+75 °C

T6

+60 °C

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Table 5-8: Maximum Output of Transmitter

Ex nA & Ex ec Vmax = 7.2 VDC

Ex ic
Uo = 7.2 VDC Io = 7.3 mA Po = 13.2 mW Lo = 667 mH Co = 13.5 µF

5.8
5.8.1

Special Conditions for Safe Use (X):
1. For all potentially explosive atmospheres, if the enclosure is made of non-metallic materials, or if it is made of metal having a paint layer thicker than 0.2mm (group IIC), or 2mm (group IIB, IIA, I), or any thickness (group III), electrostatic charges shall be avoided.
2. The transmitter shall be installed in an enclosure providing a degree of protection of not less than IP54 in accordance with EN 60079-0, which is suitable for the application and correctly installed, e.g. in an enclosure that is in type of protection Ex n or Ex e.
3. Additional, for Ex nA or Ex ec, the area inside the enclosure shall be pollution degree 2 or better, as defined in EN 60664-1.
4. For EPL Dc, the surface temperature “T” of the enclosure, for a dust layer with a maximum thickness of 5mm, is the ambient temperature +20K.

China
I3 China (NEPSI) Intrinsic Safety

Certificate GYJ21.1036X

Standards GB3836.1-2010, GB3836.4-2010, GB3836.20-2010, GB12476.1-2013, GB12476.4-2010

Markings

Ex ia IIC T4/T5/T6 Ga Ex ib [ia Ga] IIC T4/T5/T6 Gb Ex iaD 20 T80 °C/T95 °C/T130 °C Ex ibD [iaD 20]21 T80 °C/T95 °C/T130 °C

5.8.2

Special Condition for Safe Use (X): See certificate for special conditions. N3 China (NEPSI) Zone 2

Certificate GYJ21.1036X

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Standards GB3836.1-2010, GB3836.4-2010, GB3836.8-2014, GB3836.20-2010
Markings Ex nA [ic Gc] IIC T6…T4 Gc Ex ic IIC T6…T4 Gc
Special Condition for Safe Use (X): See certificate for special conditions.

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5.9 Declaration of conformity

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6 China RoHS

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00825-0300-4825 Quick Start Guide 00825-0300-4825, Rev. BA June 2022
For more information: Emerson.com ©2022 Emerson. All rights reserved. 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.