Emerson Rosemount 248 Bedienungsanleitung

Quick Start Guide

00825-0300-4825, Rev BB

January2024

Rosemount™ 248 Rail Mount

Temperature Transmitter

with RK Option and HART® 7 Protocol

Contents

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

Installation.................................................................................................................................... 6

Configuration............................................................................................................................. 10

Mounting the transmitter......................................................................................................... 13

Product certifications................................................................................................................ 17

China RoHS................................................................................................................................. 31

Quick Start Guide January2024

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.

WARNING

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.

WARNING

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.

WARNING

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.

January2024 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.

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.

Quick Start Guide January2024

4 Emerson.com/Rosemount

WARNING

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.

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.

January2024 Quick Start Guide

Quick Start Guide 5

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 that 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.

Quick Start Guide January2024

6 Emerson.com/Rosemount

2.2 Connections

Table 2-1: Single input connection

2 w / 3 w / 4 w

RTD or lin. R

Thermocouple

(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, you can configure the transmitter for

either constant, internal, or external CJC via a Pt100 or Ni100 sensor. You

must select the input 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 a maximum of 63 transmitters can be connected in

parallel for a digital HART two-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.

January2024 Quick Start Guide

Quick Start Guide 7

Figure 2-1: Multidrop connection

F F F

A. Power supply

B. Connection

C. Connection

D. Connection

E. 250 Ω < Rload < 1100 Ω

F. Transmitter

2.4 Installation best practices

The terminal connectors can be removed to install sensor and power

wiring. After re-installation back into the device:

1. Align the terminal connectors with the internal pins.

2. Rotate the plastic hooks so that they are properly engaged in

the supporting plastic piece.

Quick Start Guide January2024

8 Emerson.com/Rosemount

3. Push down on the terminal connector to properly set it into

place.

Note

Improper seating can cause the hooks to wedge against the

supporting plastic and cause the connector to unseat.

January2024 Quick Start Guide

Quick Start Guide 9

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 that 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.

Quick Start Guide January2024

10 Emerson.com/Rosemount

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