Emerson Rosemount 248 Manuel utilisateur

Quick Start Guide

00825-0300-4825, Rev AA

December 2021

Rosemount™ 248 Rail Mount

Temperature Transmitter

with RK Option and HART® 7 Protocol

Contents

About this guide...........................................................................................................................3

Installation................................................................................................................................... 5

Configuration...............................................................................................................................8

Mount the transmitter................................................................................................................10

Product certifications................................................................................................................. 12

Quick Start Guide December 2021

2 Emerson.com/Rosemount

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 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.

December 2021 Quick Start Guide

Quick Start Guide 3

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.

Quick Start Guide December 2021

4 Emerson.com/Rosemount

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.

December 2021 Quick Start Guide

Quick Start Guide 5

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 CJC)(1)

mV 3 w / 4 w

potentiometer

42 44

43 I1

41 42 44

CJC

41 42 44

4I1

(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.

Quick Start Guide December 2021

6 Emerson.com/Rosemount

F F F

A. Power supply

B. Connection

C. Connection

D. Connection

E. 250 Ω < Rload < 1100 Ω

F. Transmitter

December 2021 Quick Start Guide

Quick Start Guide 7

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 AMS Device Manager

•With a HART® communicator with Emerson's DDL driver

•Via programming framework (e.g. DCS, PACTware™)

Quick Start Guide December 2021

8 Emerson.com/Rosemount

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.

11121314

A. Rosemount transmitter

B. Ex area

C. Safe area

D. 250 Ω < Rload < 1100 Ω

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).

11121314

A. Rosemount transmitter

B. 250 Ω < Rload < 1100 Ω

C. Process computer

D. DCS, etc.

December 2021 Quick Start Guide

Quick Start Guide 9

4 Mount the transmitter

4.1 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.

4.1.1 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.

4.2 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

Quick Start Guide December 2021

10 Emerson.com/Rosemount

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