Rosemount 248H Operating Manual

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Reference Manual

00809-0100-4825, Rev CB

Rosemount® 248 Temperature Transmitter

March 2014

Reference Manual

NOTICE

00809-0100-4825, Rev CB

Rosemount 248 Temperature Transmitter

Rosemount 248 Hardware Revision

Headmount

Railmount

HART

Device Revision

Field Communicator Field Device Revision

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

1 800 999 9307 (7:00 a.m. to 7:00 P.M. CST) National Response Center

1 800 654 7768 (24 hours a day) Equipment service needs

International 1 952 906 8888

5.1

Dev v1, DD v1

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 Process Management Sales Representative.

Reference Manual

00809-0100-4825, Rev CB

Content

1Section 1: Introduction

Table of Contents

March 2014

1.1 Safety messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1.1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

1.2 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.1 Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.3 Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.3.2 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.3.3 Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.3.4 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.3.5 Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

1.4 Return of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.5 Product recycling/disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

2Section 2: Installation

2.1 Safety messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1.1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

2.2 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

2.3 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

2.3.1 Typical European and Asia Pacific installation . . . . . . . . . . . . . . . . . . . . . . . .10

2.3.2 Typical North and South American installation . . . . . . . . . . . . . . . . . . . . . . .11

2.4 Multichannel installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

2.5 Set the switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

2.5.1 Failure mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

2.6 Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

2.6.1 Sensor connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

2.7 Power supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

2.7.1 Surges/transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

2.7.2 Ground the transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Table of Contents

3Section 3: Configuration

3.1 Safety messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

3.1.1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

3.2 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

3.2.1 Setting the loop to manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

vii

Table of Contents

March 2014

Reference Manual

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3.3 AMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

3.3.1 Apply AMS changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

3.4 Field communicator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

3.4.1 HART traditional menu tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

3.4.2 HART device dashboard menu tree. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

3.4.3 Fast Key sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

3.4.4 Review configuration data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

3.4.5 Check output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

3.4.6 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

3.4.7 Information variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

3.4.8 Diagnostics and service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

3.5 Multidrop communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

3.6 Rosemount 248 Configuration Interface specifications . . . . . . . . . . . . . . . . . . . . .40

3.6.1 Configuration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

3.6.2 Configuration hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

3.6.3 Rosemount 248 PC Programmer Kit installation . . . . . . . . . . . . . . . . . . . . .41

4Section 4: Operation and maintenance

4.1 Safety messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

4.1.1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

4.2 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

4.2.1 Trim the transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

4.3 Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

4.3.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

4.4 Diagnostic messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

4.4.1 Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

4.4.2 Field communicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

AAppendix A: Specifications and reference data

A.1 Transmitter specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

A.1.1 Functional specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

A.1.2 Physical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

A.1.3 Performance specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

A.2 Sensor specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

viii

A.2.1 Thermocouples – IEC 584 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

A.2.2 Thermocouples – ASTM E- 230 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

A.2.3 RTDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

A.2.4 Thermowells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

Table of Contents

Reference Manual

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BAppendix B: Product Certifications

Table of Contents

March 2014

A.3 Dimensional drawings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

A.4 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62

B.1 Approved Manufacturing Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

B.2 European Directive Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

B.3 Ordinary Location Certification from FM Approvals . . . . . . . . . . . . . . . . . . . . . . . .65

B.3.1 North America . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

B.3.2 Europe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66

B.3.3 International . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

B.3.4 China . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

B.3.5 Combinations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

B.3.6 Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

B.4 Installation drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

Table of Contents

Reference Manual

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Section 1 Introduction

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2

Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3

Return of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5

Product recycling/disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5

1.1 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.

Section 1: Introduction

March 2014

1.1.1 Warnings

Failure to follow these installation guidelines could result in death or serious injury.

 Make sure only qualified personnel perform the installation.

Explosions could result in death or serious injury.

 Do not remove the connection head cover in explosive atmospheres when the

circuit is live.

 Before connecting a Field Communicator in an explosive atmosphere, make sure the

instruments in the loop are installed in accordance with intrinsically safe or non-intrinsic 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.

Introduction

Section 1: Introduction

March 2014

1.2 Overview

1.2.1 Manual

This manual is designed to assist in the installation, operation, and maintenance of the Rosemount 248 Temperature Transmitter.

Section 1: Introduction

 Transmitter and Manual Overview

 Things to considerations

 How to return the transmitter

Section 2: Installation

 How to mount the transmitter

 How to Install the transmitter

 How to set the switches to ensure proper use

 How to wire and power up the transmitter

Reference Manual

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Section 3: Configuration

 Commissioning to transmitter

 How to use the Field Communicator to configure the transmitter

Section 4: Operation and maintenance

 Calibration the transmitter

 Explanation of hardware maintenance and diagnostic messages

Appendix A: Specifications and reference data

 Transmitter and Sensor Specifications

 Dimensional drawings

 Ordering Information

Appendix B: Product Certifications

 Product Certifications/Hazardous Locations Certifications

 Installation Drawings

1.2.2 Transmitter

Features of the Rosemount 248 include:

 Acceptance of inputs from a wide variety of RTD and thermocouple sensors

 Configuration using HART protocol

 Electronics encapsulated in epoxy and enclosed in a plastic housing, making the

transmitter extremely durable and ensuring long-term reliability

 A compact size and three housing options that allow mounting flexibility in the field

Introduction

Reference Manual

00809-0100-4825, Rev CB

Refer to the following literature for sensors, thermowells, and extensions that form a complete point solution with the Rosemount 248:

 Temperature Sensors and Assemblies Product Data Sheet, Volume 1 (Document No.

00813-0100-2654)

 Temperature Sensors and Assemblies Product Data Sheet, Volume 2 (Document No.

00813-0200-2654)

 Temperature sensors and Assemblies Product Data Sheet, Volume 3 (Document No.

00813-0301-2654)

1.3 Considerations

1.3.1 General

Electrical temperature sensors, such as RTDs and thermocouples, produce low-level signals proportional to the sensed temperature. The Rosemount 248 converts the low-level sensor signal to a standard 4–20 mA dc signal that is relatively insensitive to lead length and electrical noise. This current signal is transmitted to the control room through two wires.

Section 1: Introduction

March 2014

1.3.2 Commissioning

The transmitter may be commissioned before or after installation. It can be useful to commission it on the bench, before installation, to ensure proper operation and to become familiar with its functionality. The instruments in the loop should be installed according to the intrinsically safe or non-incendive field wiring practices before connecting a Field Communicator in an explosive atmosphere. For more information, see “Commissioning” on

page 24.

1.3.3 Mechanical

Location

When choosing an installation location, take into account access to the transmitter.

Special mounting

Special hardware is available for mounting a Rosemount 248 head mount transmitter to a DIN rail.

1.3.4 Electrical

Proper electrical installation is necessary to prevent errors from sensor lead resistance and electrical noise. For best results, shielded cable should be used in electrically noisy environments. A resistance between 250 and 1100 ohms must be present in the loop for communication with a Field Communicator.

Introduction

Make wiring connections through the cable entry in the side of the connection head being sure to provide adequate clearance for cover removal.

Section 1: Introduction

75 10 125 150 175 200 225

Temperature rise above ambient (°C)

Extension length (mm)

March 2014

1.3.5 Environmental

The transmitter electronics module is permanently sealed within the housing, to resist moisture and corrosive damage. Verify that the operating atmosphere of the transmitter is consistent with the appropriate hazardous locations certifications.

Temperature effects

The transmitter operates within specifications for ambient temperatures between –40 and 185 °F (–40 and 85 °C). Process heat from the process is transferred from the thermowell to the transmitter housing so if the expected process temperature is near or above specification limits, consider using an additional thermowell lagging, and extension nipple, or a remote mounting configuration to isolate the transmitter from the process.

Figure 1-1 provides an example of the relationship between transmitter housing temperature

rise and extension length.

Figure 1-1. Rosemount 248 Transmitter Connection Head Temperature rise vs. Extension Length

Reference Manual

00809-0100-4825, Rev CB

Example

The transmitter specification limit is 85 °C. If the ambient temperature is 55 °C and the process temperature to be measured is 800 °C, the maximum permissible connection head temperature rise is the transmitter specification limit minus the ambient temperature (moves 85 to 55 °C), or 30 °C.

In this case, an extension of 100 mm meets this requirement, but 125 mm provides a margin of 8 °C, reducing any temperature effects in the transmitter.

Introduction

Reference Manual

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1.4 Return of materials

To expedite the return process in North America, call the Emerson Process Management National Response Center toll-free at 800-654-7768. This center is available 24 hours a day and will assist you with any needed information or materials.

The center will ask for the following information:

 Product model

 Serial numbers

 The last process material to which the product was exposed

The center will provide

 A Return Material Authorization (RMA) number

 Instructions and procedures that are necessary to return goods that were exposed to

hazardous substances

Note

If a hazardous substance is identified, a Material Safety Data Sheet (MSDS), required by law to be available to people exposed to specific hazardous substances, must be included with the returned materials.

Section 1: Introduction

March 2014

Outside North America, contact a local Emerson Process Management representative.

1.5 Product recycling/disposal

Recycling of equipment and packaging should be taken into consideration and disposed of in accordance with local and national legislation/regulations.

Introduction

Reference Manual

00809-0100-4825, Rev CB

Section 2 Installation

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 9

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 10

Set the switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 14

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 15

Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 18

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.

Section 2: Installation

March 2014

2.1.1 Warnings

Failure to follow these installation guidelines could result in death or serious injury.

 Make sure only qualified personnel perform the installation.

Explosions could result in death or serious injury.

 Do not remove the connection head cover in explosive atmospheres when the

circuit is live.

 Before connecting a communicator in an explosive atmosphere, make sure the

instruments in the loop 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.

Installation

Section 2: Installation

START

HERE

Bench

calibration

BASIC SETUP

Set Sensor type

Set Number of wires

Set Units

Set Range values

Set Damping

VERIFY

Simulate Sensor input

Within

Specifications

Refer to Section 4: Operation and

maintenance

FIELD INSTALL

Mount transmitter

Wire transmitter

Power transmitter

FINISHED

March 2014

Figure 2-1. Installation Flowchart

Reference Manual

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Installation

Reference Manual

00809-0100-4825, Rev CB

2.2 Mounting

Mount the transmitter at a high point in the conduit run to prevent moisture from draining into the transmitter housing.

The Rosemount 248R installs directly to a wall or to a DIN rail.

The Rosemount 248H installs:

 In a connection head or universal head mounted directly on a sensor assembly

 Apart from a sensor assembly using a universal head

 To a DIN rail using an optional mounting clip

Mounting a Rosemount 248H to a DIN rail

To attach a head mount transmitter to a DIN rail, assemble the appropriate rail mounting kit (part number 00248-1601-0001) to the transmitter as shown in Figure 2-2.

Figure 2-2. Assembling Rail Clip Hardware to a Rosemount 248

Section 2: Installation

March 2014

Installation

A. Mounting hardware B. Transmitter C. Rail clip

Section 2: Installation

March 2014

2.3 Installation

The Rosemount 248 can be ordered assembled to a sensor and thermowell or as a stand-alone unit. If ordered without the sensor assembly, use the following guidelines when installing the transmitter with an integral sensor assembly.

2.3.1 Typical European and Asia Pacific installation

Head mount transmitter with DIN plate style sensor

1. Attach the thermowell to the pipe or process container wall then install and tighten the thermowell before applying process pressure.

2. Assemble the transmitter to the sensor. Push the transmitter mounting screws through the sensor mounting plate and insert the snap rings (optional) into the transmitter mounting screw groove.

3. Wire the sensor to the transmitter (see “Sensor wiring Diagrams” on page 16).

Reference Manual

00809-0100-4825, Rev CB

4. Insert the transmitter-sensor assembly into the connection head. Thread the transmitter mounting screw into the connection head mounting holes and assemble the extension to the connection head then insert the assembly into the thermowell.

5. Slip the shielded cable though the cable gland

6. Attach a cable gland into the shielded cable.

7. Insert the shielded cable leads into the connection head through the cable entry then connect and tighten the cable gland.

8. Connect the shielded power cable leads to the transmitter power terminals making sure to avoid contact with sensor leads and sensor connections.

9. Install and tighten the connection head cover making sure the enclosure covers are fully engaged to meet explosion-proof requirements.

A. Rosemount 248 transmitter D. Transmitter mounting screws B. Connection head E. Integral mount sensor with flying leads C. Thermowell F. E xt ensi on

Installation

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00809-0100-4825, Rev CB

2.3.2 Typical North and South American installation

Head mount transmitter with threaded sensor

1. Attach the thermowell to the pipe or process container wall then install and tighten thermowells before applying process pressure.

2. Attach necessary extension nipples and adapters to the thermowell making sure to seal the nipple and adapter threads with silicone tape.

3. Twist the sensor into the thermowell and install drain seals, if required, for severe environments or to satisfy code requirements.

4. Pull the sensor wiring leads through the universal head and transmitter. Mount the transmitter in the universal head by threading the transmitter mounting screws into the universal head mounting holes.

5. Mount the transmitter-sensor assembly into the thermowell sealing the adapter threads with silicone tape.

Section 2: Installation

March 2014

6. Install conduit for field wiring to the conduit entry of the universal head making sure to seal the conduit threads with silicone tape.

7. Pull the field wiring leads through the conduit into the universal head. Attach the sensor and power leads to the transmitter. Avoid contact with other terminals.

8. Install and tighten the universal head cover. Enclosure covers must be fully engaged to meet explosion-proof requirements.

A. Threaded thermowell D. Universal head B. Threaded style sensor E. Conduit entry C. Standard extension

Installation

Section 2: Installation

March 2014

Rail mount transmitter with integral mount sensor

The least complicated assembly uses:

 an integral mount sensor with terminal block

 an integral DIN style connection head

 a standard extension

 a threaded thermowell

Refer to the Metric Product Data Sheet (Document No. 00813-0101-2654) for complete sensor and mounting accessory information.

To complete the assembly:

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

3. Attach the sensor to the connection head and mount the entire assembly to the

Reference Manual

00809-0100-4825, Rev CB

thermowell before applying pressure.

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.

Figure 2-3. Typical Rail Mount Transmitter Mounting Configuration using integral

Mount Sensor and Assembly

A. Rail mount transmitter D. Connection head B. Sensor leads with cable gland E. Standard extension C. Integral mount sensor with terminal block F. T hr eade d t herm owel l

Installation

Reference Manual

00809-0100-4825, Rev CB

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

Refer to Volume 1 of the Rosemount Sensors Product Data Sheet (Document No. 00813-0100-2654) for complete sensor and mounting accessory information.

To complete the assembly:

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

3. Attach necessary extension nipples and adapters. Seal the nipple and adapter threads

Section 2: Installation

March 2014

thermowell before applying pressure.

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.

Figure 2-4. Typical Rail Mount Transmitter Mounting Configuration using Threaded Style Sensor and Assembly

Installation

A. Rail mount transmitter D. Standard extension B. Threaded sensor connection head E. Threaded thermowell C. Threaded style sensor

Section 2: Installation

Between 250  and 1100  if no load resistor.

March 2014

2.4 Multichannel installations

Several transmitters can be connected to a single master power supply, as shown in Figure 2-5. In this case, the system may be grounded only at the negative power supply terminal. In multichannel installations, where several transmitters are dependent on one power supply and the loss of all transmitters would cause operational problems, consider an uninterrupted power supply or a back-up battery. The diodes shown in Figure 2-5 prevent unwanted charging or discharging of the back-up battery.

Figure 2-5. Multichannel Installations

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00809-0100-4825, Rev CB

A. Transmitter no. 1 E. Readout or Controller no. 2 B. Transmitter no. 2 F. Backup battery C. R

Lead

D. Readout or Controller no. 1 H. To additional transmitters

2.5 Set the switches

2.5.1 Failure mode

Each transmitter continuously monitors its performance during normal operation with an automatic diagnostic routine of continuous timed series of checks. If an input sensor failure or a transmitter electronics failure is detected, the transmitter outputs the low or high alarm, depending on the failure mode configuration.

For sensor temperature outside of range limits:

Standard Saturation Levels:

 3.90 mA on the low end

 20.5 mA on the high end

NAMUR-Compliant Saturation Levels:

G. dc Power supply

 3.80 mA on the low end

 20.5 mA on the high end

These values are also custom configurable by the factory or using the Field Communicator or AMS. See “Alarm and saturation” on page 36 for instructions on how to change the alarm and saturation levels with the Field Communicator.

Installation

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00809-0100-4825, Rev CB

Note

Microprocessor failures cause high alarm regardless of alarm direction (high or low) choice.

The values the transmitter drives its output in failure mode depend on if it is configured to standard, NAMUR-compliant, or custom operation. See “Software detected failure mode” on

page 52 for standard and NAMUR-compliant operation parameters.

2.6 Wiring

All power to the transmitter is supplied over the signal wiring. Ordinary copper wire of sufficient size should be used to ensure the voltage across the transmitter power terminals does not drop below 12.0 Vdc. Verify that the operating atmosphere of the transmitter is consistent with the appropriate hazardous locations certifications. Always use extreme caution when making contact with the leads and terminals.

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.

Section 2: Installation

March 2014

Note

Do not apply high voltage (e.g., ac line voltage) to the transmitter terminals since high voltage can damage the unit. (Sensor and transmitter power terminals are rated up to 42.4 Vdc.) Use extreme caution when making contact with the leads and terminals.

For multichannel installations, see page 14. The transmitters accept inputs from a variety of RTD and thermocouple types. Refer to Figure 2-7 on page 16 when making sensor connections.

Use the following steps to wire the transmitter:

1. Remove the terminal block cover (if applicable).

2. Connect the positive power lead to the “+” terminal. Connect the negative power lead to the “–” terminal (see Figure 2-6). Use extreme caution when making contact with the leads and terminals.

3. Tighten the terminal screws.

4. Reattach and tighten the cover (if applicable). All connection head covers must be fully engaged to meet explosion-proof requirements

5. Apply power (see “Power supply”).

Installation

Section 2: Installation

44.0 (1.7)

12.9 (0.51)

24.5 (0.97)

1234234 12 34 1234

2-wire

RTD and 

3-wire*

RTD

and 

T/C

and mV

4-wire RTD

and 

March 2014

Figure 2-6. Rosemount 248 wiring

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Power, communication and

sensors terminals

Note: Signal loop may be grounded at any single point or left ungrounded. Note: A Field Communicator may be connected at any termination point in the signal loop. The signal loop must have between 250 and

1100 ohms load for communications.

Connecting a communicator to a transmitter loop

A. Field communicator B. Power supply C. 250  R

 1100 

2.6.1 Sensor connections

The Rosemount 248 is compatible with a number of RTD and thermocouple sensor types.

Figure 2-7 shows the correct input connections to the sensor terminals on the transmitter. To

ensure proper sensor connection, anchor the sensor lead wires to the appropriate compression terminals and tighten the screws. Use extreme caution when making contact with the leads and terminals.

Figure 2-7. Sensor wiring Diagrams

Rosemount 248 Sensor connections diagram

* Emerson Process Management provides 4-wire sensors for all single element RTDs. Use these RTDs in 3-wire

configurations by leaving the unneeded leads disconnected and insulated with electrical tape.

Thermocouple or millivolt inputs

The thermocouple can be connected directly to the transmitter. Use appropriate thermocouple extension wire if mounting the transmitter remotely from the sensor. Make millivolt input connections with copper wire, and use shielding for long runs of wire.

Installation

Reference Manual

Basic Error

Imbalance of Lead Wires



PtRo



------------------------------------------------------------ ----- -

Error due to amb. temp. variation



T

amb

 Imbalance of Lead Wires



Ro

---------------------------------------------------------------- ---------------------------------------------------------

00809-0100-4825, Rev CB

RTD or ohm inputs

The transmitters accepts a variety of RTD configurations, including 2-wire, 3-wire and 4-wire designs. If the transmitter is mounted remotely from a 3-wire or 4-wire RTD, it will operate within specifications, without recalibration, for lead wire resistances up to 60 ohms per lead (or the equivalent to 6,000 feet of 20 AWG wire). In this case, the leads between the RTD and transmitter should be shielded. If using only two leads, the RTD leads are in series with the sensor element, so significant errors can occur when the lead lengths exceed three feet of 20 AWG wire (approximately 0.05 °C/ft). For longer runs, attach a third or fourth lead, as described above.

Sensor lead wire resistance effect– RTD input

When using a 4-wire RTD, the effect of lead resistance is eliminated and does not impact accuracy. However, a 3-wire sensor will not fully cancel lead resistance error it cannot compensate for imbalances in resistance between the lead wires. Using the same type of wire on all three lead wires makes a 3-wire RTD installation the most accurate. A 2-wire sensor produces the largest error since it directly adds the lead wire resistance to the sensor resistance. For 2- and 3-wire RTDs, an additional lead wire resistance error is induced with ambient temperature variations. The table and the examples shown on Tab l e 2 - 1help quantify these errors.

Section 2: Installation

March 2014

Table 2-1. Examples of Approximate Basic Error

Sensor input Approximate basic error

4-wire RTD None (independent of lead wire resistance) 3-wire RTD ± 1.0  in reading per ohm of unbalanced lead wire resistance

2-wire RTD 1.0  in reading per ohm of lead wire resistance

(Unbalanced lead wire resistance = maximum imbalance between any two leads.)

Examples of approximate lead wire resistance effect calculations

Given:

Total cable length: 150 m

Imbalance of the lead wires at 20 °C: 0.5 

Resistance/length (18 AWG Cu): 0.025 /m °C

Temperature coefficient of Cu (Cu): 0.039 / °C

Temperature coefficient of Pt(Pt): 0.00385 / °C

Change in Ambient Temperature (T

RTD Resistance at 0 °C (Ro): 100  (for Pt 100 RTD)

 Pt100 4-wire RTD: No lead wire resistance effect.

 Pt100 3-wire RTD:

): 25 °C

amb

Installation

Section 2: Installation

Basic error

0.5 

0.00385  /  C100 

----------------------------------------------------------- ---------------------- -

1.3  C==

Error due to amb. temp. var. of 25 °C

0.0039  /  C25  C 0.5 

0.00385  /  C100

----------------------------------------------------------- --------------------------------------------

0.13·C==

Basic Error

Lead Wire Resistance



PtRo



----------------------------------------------------------

Error due to amb. temp. variation



T

amb

 Lead Wire Resistance



Ro

--------------------------------------------------------------- --------------------------------------------------

Basic error

7.5 

0.00385  /  C100 

------------------------------------------------------------ --------------------- -

19.5  C==

Error due to amb. temp. var. of 25 °C

0.0039  /  C25  C 7.5 

0.00385  /  C100

--------------------------------------------------------------- ----------------------------------------

1.9 C==

4–20 mA dc

1322

1100

1000

750

500

250

12.0

20 30 40 42.4

Load (Ohms)

Supply voltage (V dc)

Operating

region

Maximum load = 40.8 x (Supply voltage – 12.0)

March 2014

Reference Manual

00809-0100-4825, Rev CB

Lead wire imbalance seen by the transmitter = 0.5

 Pt100 2-wire RTD:



Lead wire resistance seen by the transmitter = 150 m × 2 wires × 0.025

/m = 7.5 

2.7 Power supply

To communicate with a transmitter, an 18.1 Vdc minimum power supply is required. The power supplied to the transmitter should not drop below the transmitter lift-off voltage (see

Figure 2-8). If the power drops below the lift-off voltage while the transmitter is being

configured, the transmitter may interpret the configuration information incorrectly.

The dc power supply should provide power with less than 2 percent ripple. The total resistance load is the sum of the resistance of the signal leads and the load resistance of any controller, indicator, or related pieces of equipment in the loop. Note that the resistance of intrinsic safety barriers, if used, must be included.

Figure 2-8. Load Limits

Installation

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00809-0100-4825, Rev CB

2.7.1 Surges/transients

The transmitter will withstand electrical transients of the energy level encountered in static discharges or induced switching transients. However, high-energy transients, such as those induced in wiring from nearby lightning strikes, welding, heavy electrical equipment, or switching gears, can damage both the transmitter and the sensor. To protect against high-energy transients, install the transmitter in a suitable connection head with the Rosemount 470 Transient Protector. Refer to the Rosemount 470 Transient Protector Product Data Sheet (Document No. 00813-0100-4191) for more information.

2.7.2 Ground the transmitter

The transmitter operates with the current signal loop either floating or grounded. However, extra noise in floating systems may affect many types of readout devices. If the signal appears noisy or erratic, grounding the current signal loop at a single point may solve the problem. The best place to ground the loop is at the negative terminal of the power supply. Do not ground the current signal loop at more than one point.

The transmitter is electrically isolated to 500 Vac rms (707 Vdc), so the input circuit may also be grounded at any single point. When using a grounded thermocouple, the grounded junction serves as this point.

Section 2: Installation

March 2014

Note

Do not ground the signal wire at both ends.

Ungrounded thermocouple, mV, and RTD/ohm inputs

Each process installation has different requirements for grounding. Use the grounding options recommended by the facility for the specific sensor type, or begin with grounding Option 1 (the most common).

Option 1:

1. Connect sensor wiring shield to the transmitter housing (only if the housing is grounded).

2. Make sure that the sensor shield is electrically isolated from surrounding fixtures that may be grounded.

3. Ground signal wiring shield at the power supply end.

Installation

A. Transmitter C. 4-20 mA loop B. Sensor wires D. Shield ground point

Section 2: Installation

Connect shields together, electrically isolated from the transmitter

D D

March 2014

Option 2 (for ungrounded housing):

1. Connect signal wiring shield to the sensor wiring shield.

2. Make sure that the two shields are tied together and electrically isolated from the

3. Ground shield at the power supply end only.

4. Ensure that the sensor shield is electrically isolated from the surrounding grounded

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00809-0100-4825, Rev CB

transmitter housing.

fixtures.

A. Transmitter C. 4-20 mA loop B. Sensor wires D. Shield ground point

Option 3:

1. Ground sensor wiring shield at the sensor, if possible.

2. Make sure that the sensor wiring and signal wiring shields are electrically isolated from the transmitter housing.

3. Do not connect the signal wiring shield to the sensor wiring shield.

4. Ground signal wiring shield at the power supply end.

A. Transmitter C. 4-20 mA loop B. Sensor wires D. Shield ground point

Installation

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Grounded Thermocouple Inputs

Option 4

1. Ground sensor wiring shield at the sensor.

2. Make sure that the sensor wiring and signal wiring shields are electrically isolated from

3. Do not connect the signal wiring shield to the sensor wiring shield.

4. Ground signal wiring shield at the power supply end.

Section 2: Installation

March 2014

the transmitter housing.

A. Transmitter C. 4-20 mA loop B. Sensor wires D. Shield ground point

Installation

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Section 3 Configuration

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 23

Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 24

AMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 24

Field communicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 25

Multidrop communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 39

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.

Section 3: Configuration

March 2014

3.1.1 Warnings

Failure to follow these installation guidelines could result in death or serious injury.

 Make sure only qualified personnel perform the installation.

Explosions could result in death or serious injury.

 Do not remove the connection head cover in explosive atmospheres when the

circuit is live.

 Before connecting a communicator in an explosive atmosphere, make sure the

instruments in the loop are installed in accordance with instrinsically safe or non-incendive field wiring practices.

 When sending or requesting data that would disrupt the loop or change the output of

the transmitter, set the process application loop to manual.

 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.

Configuration

Section 3: Configuration

March 2014

3.2 Commissioning

The Rosemount 248 must be configured for certain basic variables to operate. In many cases, all of these variables are pre-configured at the factory. Configuration may be required if the transmitter is not configured or if the configuration variables need to be revised.

Commissioning consists of testing the transmitter and verifying transmitter configuration data. The Rosemount 248 can be commissioned before (off-line) or after (on-line) installation. During on-line configuration, the transmitter is connected to a Field Communicator and data is entered into the working register of the communicator and sent directly to the transmitter. Off-line configuration consists of storing configuration data in a Field Communicator while it is not connected to a transmitter. Data is stored in nonvolatile memor y and can be downloaded to the transmitter at a later time. Commissioning the transmitter on the bench before installation

using a Field Communicator or AMS transmitter components are working.

To commission on the bench, connect the transmitter and the Field Communicator (or AMS) as shown in Figure 2-6 on page 16. Make sure the instruments in the loop are installed according to intrinsically-safe or non-incendive field wiring practices before connecting in an explosive atmosphere. Connect Field Communicator or AMS leads at any termination point in the signal loop. Connect the communication leads to the “COMM” terminals located on the terminal block. Do not connect to the “TEST” terminals. Then set the transmitter jumpers to avoid damage caused by the plant environment.

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™

Suite: Intelligent Device Manager ensures that all

3.2.1 Setting the loop to manual

When sending or requesting data that could disrupt the loop or change the output of the transmitter, set the process application loop to manual. The Field Communicator will prompt to set the loop to manual when necessary. Acknowledging this prompt does not set the loop to manual, it is only a reminder. Setting the loop to manual is a separate operation.

3.3 AMS

One of the key benefits of intelligent devices is the ease of device configuration. When used with AMS, the Rosemount 248 is easily configured and provides instant and accurate alerts and alarms. The screens use a color-coding for a visual indication of the transmitter health, and to indicate any changes that may need to be made or written to the transmitter.

 Gray screens: indicates that all information has been written to the transmitter

 Yellow on screen: changes have been made in the software but not sent to the

transmitter

 Green on screen: all current changes on screen have been written to the transmitter

 Red on screen: indicates an alarm or alert that requires immediate investigation

Configuration

Reference Manual

00809-0100-4825, Rev CB

3.3.1 Apply AMS changes

Right click on the device and select “Configuration Properties” from the menu.

1. From the bottom of the screen, choose Apply.

2. When an Apply Parameter Modification screen appears, enter the desired information and choose OK.

3. After reading the warning provided, choose OK.

3.4 Field communicator

The Field Communicator exchanges information with the transmitter from the control room, the instrument site, or any wiring termination point in the loop. To assist communication, connect the Field Communicator in parallel with the transmitter, as shown in Figure 2-6 on

page 16. Use the loop connection ports, which are non-polarized, on the near panel of the Field

Communicator. Do not make connections to the serial port of the NICAad recharger jack in explosive atmospheres. To use the Field Communicator in an explosive atmosphere, the instruments in the loop should be installed according to intrinsically safe or non-incendive field wiring practices.

Section 3: Configuration

March 2014

When using a Field Communicator, configuration changes must be sent to the transmitter using the “Send” key (F2).

For more information regarding the Field Communicator, see the Field Communicator Reference Manual (http://www.fieldcommunicator.com/suppmanu.htm).

Configuration

Section 3: Configuration

The review menu lists all of the information stored in the Rosemount 248. This includes device information, measuring element, output configuration, and software revision

1. Test device

2. Calibration

3. Write protect

On-line Menu

1. Snsr 1 digital reading

2. Terminal digital reading

1. Snsr 1 input trim

2. Snsr 1 trim-fact

3. Active calibrator

1. Loop test

2. Self test

3. Master reset

4. Status

1. SNSR 1 trim

2. D/A trim

3. Scaled D/A trim

1. Revision #s

2. Sensor review

3. Dev outputs review

4. Device information

5. Measurement filtering

1. Process variables

2. Diagnostics and service

3. Configuration

4. Review

1. Variable mapping

2. Sensor configuration

3. Device output configuration

4. Device information

5. Measurement filtering

1. Transmitter vars

2. PV is

3. Snsr 1

4. AO

5. % rnge

6. PV LRV

7. PV URV

8. PV LSL

9. PV USL

10.PV Damping

1. Device setup

2. PV is

3. PV

4. PV AO

5. % RNGE

6. PV LRV

7. PV URV

1. PV is

2. SV is

3. Variable re-map

1. Sensor 1

2. Terminal temp

1. Connections

2. Snsr 1 setup

3. Sensor S/N

1. Terminal units

2. Terminal damp

3. Terminal LSL

4. Terminal USL

1. PV range values

2. Alarm/saturation

3. HART output

1. AO alarm type

2. Low alarm

3. High alarm

4. Low sat.

5. High sat.

1. Poll addr

2. Num req preams

3. Burst mode

4. Burst option

1. Tag

2. Date

3. Descriptor

4. Message

5. Final assembly number

1. 50/60 Hz filter

2. Active calibrator

3. Open sensor holdoff

4. Intermit detect

5. Intermit thresh

1. 2-wire offset

2. Snsr 1 units

3. Snsr 1 damp

4. Snsr LSL

5. Snsr USL

1. PV LRV

2. PV URV

3. PV damping

4. PV units

5. Apply values

6. PV LSL

7. PV USL

8. Min. span

These numbers are to be entered by the user.

March 2014

3.4.1 HART traditional menu tree

Options listed in bold type indicate a selection provides other options. For ease of operation, changing calibration and setup, such as sensor type, number of wires, and range values, can be completed from several locations

Reference Manual

00809-0100-4825, Rev CB

Configuration

Reference Manual

Home

1 Overview 2 Configure 3 Service tools

Overview

1 Device status 2 Primary variable is 3 Sensor temperature 4 Analog output value 5 Upper range Value 6 Lower range value 7 Device information

Device Information

1 Identification 2 Revision information 3 Alarm type and security

Revision Information

1 HART universal 2 Device 3 Hardware 4 Software 5 Device driver

Device Status

1 Active alerts

Active Alerts

1 Good (only if no alerts) 2 Failed (fix now) 3 Maintenance

Good

1 Refresh alerts 2 No active alert

Failed

1 Refresh alerts 2 Memory failure 3 Sensor error/open 4 Sensor short 5 Terminal temperature failure 6 Electronics failure 7 Invalid configuration 8 Calibration failure 9 Sensor degraded 10 Sensor out of range 11 Terminal temp out of range

Maintenance

1 Refresh alerts 2 Invalid configuration 3 Calibration error 4 Sensor degraded 5 Sensor out of range 6 Terminal temp out of range

Configure

1 Guided setup 2 Manual setup

Guided Setup

1 Configure sensor 2 Calibrate sensor 3 Configure device

Sensor

1 Sensor value 2 Type 3 Connection 4 Units 5 Two Wire offset 6 Damping 7 Serial number 8 Upper sensor limit 9 Lower sensor limit

Manual Setup

1 Sensor 2 Analog output 3 Device 4 HART

Analog Output

1 Sensor value 2 Analog output 3 Percent range 4 Configuration 5 Alarm/Sat levels

Device

1 Identification 2 Device temp units 3 Open sensor hold off 4 Security enable/disable 5 Noise rejection

HART

1 Polling address 2 Burst mode 3 Burst option

Noise Rejection

1 AC oower filter 2 Transient filter threshold

Alarm/Sat Levels

1 High alarm level 2 Low alarm level 3 High sat level 4 Low sat level 5 Alarm direction

Configuration

1 Primary variable is 2 Upper range value 3 Lower range value 4 Minimum span

Identification

1 Tag 2 Date 3 Message 4 Descriptor 5 Final assembly no.

Service Tools

1 Alerts 2 Variables 3 Trends 4 Maintenance 5 Simulate

Alerts

1 Refresh alerts 2 No Active alerts 3 Memory failure 4 Sensor error/open 5 Sensor short 6 Terminal temp failure 7 Electronics failure 8 Invalid configuration 9 Calibration error 10 Sensor degraded 11 Sensor out of range 12 Terminal temp out of range

Variables

1 Variable summary 2 Sensor temperature (gauge) 3 Terminal temperature (guage) 4 Analog output (guage)

Trends

1 Sensor value (trend) 2 Terminal temperature (trend)

Maintenance

1 Sensor calibration 2 Analog trim 3 Scaled trim 4 Master reset

Simulate

1 Loop test

Sensor Calibration

1 Calibrate sensor 2 Restore factory cal 3 Calibration mode 4 Lower cal point 5 Upper cal point

Identification

1 Tag 2 Model 3 Device ID 4 Serial number 5 Final assembly number 6 Date 7 Descriptor 8 Message

Alarm type and Security

1 Alarm direction 2 Security status 3 Saturation level 4 Alarm level

Saturation Level

1 High sat level 2 Low sat level

Alarm Level

1 High alarm level 2 Low alarm level

00809-0100-4825, Rev CB

3.4.2 HART device dashboard menu tree

Section 3: Configuration

March 2014

Configuration

Section 3: Configuration

March 2014

Reference Manual

00809-0100-4825, Rev CB

3.4.3 Fast Key sequence

Ta bl e 3 - 1 and Tab l e 3 -2 list the fast key sequences for common transmitter functions.

Table 3-1. Rosemount 248 Traditional Fast Key Sequence

Func tion Fast Keys Function Fast Keys

Active Calibrator 1, 2, 2, 1, 3 Poll Address 1, 3, 3, 3, 1

Alarm/Saturation 1, 3, 3, 2 Process Temperature 1, 1

AO Alarm Type 1, 3, 3, 2, 1 Process Variables 1, 1

Burst Mode 1, 3, 3, 3, 3 PV Damping 1, 3, 3, 1, 3

Burst Option 1, 3, 3, 3, 4 PV Unit 1, 3, 3, 1, 4

Calibration 1, 2, 2 Range Values 1, 3, 3, 1

Configuration 1, 3 Review 1, 4

D/A Trim 1, 2, 2, 2 Scaled D/A Trim 1, 2, 2, 3

Damping Values 1, 1, 10 Sensor Connection 1, 3, 2, 1, 1

Date 1, 3, 4, 2 Sensor 1 Setup 1, 3, 2, 1, 2

Descriptor 1, 3, 4, 3 Sensor Serial Number 1, 3, 2, 1, 3

Device Info 1, 3, 4 Sensor 1 Trim 1, 2, 2, 1

Device Output Configuration 1, 3, 3 Sensor 1 Trim-Factory 1, 2, 2, 1, 2

Diagnostics and Service 1, 2 Sensor Type 1, 3, 2, 1, 1

Filter 50/60 Hz 1, 3, 5, 1 Software Revision 1, 4, 1

Hardware Rev 1, 4, 1 Status 1, 2, 1, 4

Hart Output 1, 3, 3, 3 Tag 1, 3, 4, 1

Intermittent Detect 1, 3, 5, 4 Terminal Temperature 1, 3, 2, 2,

Loop Test 1, 2, 1, 1 Test Device 1, 2, 1

LRV (Lower Range Value) 1, 1, 6 URV (Upper Range Value) 1, 1, 7

LSL (Lower Sensor Limit) 1, 1, 8 USL (Upper Sensor Limit) 1, 1, 9

Measurement Filtering 1, 3, 5 Variable Mapping 1, 3, 1

Message 1, 3, 4, 4 Variable Re-Map 1, 3, 1, 3

Num Req Preams 1, 3, 3, 3, 2 Write Protect 1, 2, 3

Open Sensor Holdoff 1, 3, 5, 3 2-Wire Offset 1, 3, 2, 1, 2, 1

Percent Range 1, 1, 5

Configuration

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Section 3: Configuration

March 2014

Table 3-2. Rosemount 248 Device Dashboard Fast Key Sequence

Func tion Fast Keys Function Fast Keys

Active Calibrator 3, 4, 1, 3 Poll Address 2, 2, 4, 1

Alarm Saturation 2, 2, 2, 5 Process Temperature 1, 3

AO Alarm Type 2, 2, 2, 5 Process Variables 3, 2, 1

Burst Mode 2, 2, 4, 2 PV Damping 2, 2, 1, 6

Calibration 3, 4, 1, 1 PV Unit 2, 2, 1, 4

Configuration 2, 2, 2, 4 Range Values 2, 2, 2, 4

D/A Trim 3, 4 Scaled D/A Trim 3, 4, 3

Damping Values 2, 2, 1, 6 Sensor Connection 2, 2, 1, 3

Date 2, 2, 3, 1, 2 Sensor 1 Set Up 2, 1, 1

Descriptor 2, 2, 3, 1, 4 Sensor Serial Number 1, 7, 1, 4

Device Info 1, 7 Sensor 1 Trim 3, 4, 1, 1

Device Output Configuration 2, 2, 2, 4 Sensor 1 Trim-Factory 3, 4, 1, 2

Filter 50/60 Hz 2, 2, 3, 7, 1 Sensor Type 2, 2, 1,2

Hardware Rev 1, 7, 2, 3 Software Revision 1, 7, 2, 4

Hart Output 1, 7, 2, 1 Status 1, 1

Loop Test 3, 5, 1 Tag 2, 2, 3, 1, 1

LVR (Lower Range Value) 2, 2, 2, 4, 3 Terminal Temperature 3, 3, 2

LSL (Lower Sensor Limit) 2, 2, 1, 9 URV (Upper Range Value) 2, 2, 2, 4, 2

Message 2, 2, 3, 1, 3 USL (Upper Sensor Limit) 2, 2, 1, 8

Open Sensor Holdoff 2, 2, 3, 4 Write Protect 2, 2, 3, 6

Percent Range 2, 2, 2, 3 2-Wire Offset 2, 2, 1, 5

Configuration

Section 3: Configuration

March 2014

3.4.4 Review configuration data

Before operating the Rosemount 248 in an actual installation, review all of the factory-set configuration data to be sure that it reflects the current application.

Review

Fast Key sequence

When activating the Review function, scroll through the configuration data list to check each process variable. If changes to the transmitter configuration data are necessary, refer to “Config-

uration” below.

1, 4

3.4.5 Check output

Before performing other transmitter on-line operations, review the Rosemount 248 digital output parameters to be sure that the transmitter is operating properly.

Process variables

Fast Key sequence

1, 1

Reference Manual

00809-0100-4825, Rev CB

The Process Variables menu displays continuously updated process variables, including sensor temperature, percent of range, analog output, and terminal temperature. The primary variable is the 4 –20 mA analog signal. The secondary variable is the transmitter terminal temperature.

3.4.6 Configuration

The Rosemount 248 must be configured for certain basic variables to be operational. In many cases, these variables are pre-configured at the factory. Configuration may be required if the transmitter is not configured, or if the configuration variables need revision.

Variable mapping

Fast Key sequence

The Variable Mapping menu displays the sequence of the process variables. When using the Rosemount 248 5 Variable Re-Map can be selected to change this configuration. When the Select PV screen appears Snsr 1 must be selected. Either Sensor 1, Term inal Temperatur e, or not used can be selected for the remaining variables. The primary variable is the 4–20 mA analog signal.

1, 3, 1

Configuration

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Select sensor type

The Connections command allows selection of the sensor type and the number of sensor wires to be connected. Select from the following sensors:

 2-, 3-, or 4-wire Pt 100, Pt 200, Pt 500, Pt 1000 RTDs:  = 0.00385 /°C  2-, 3-, or 4-wire Pt 100:  = 0.003916 /°C

 2-, 3-, or 4-wire Ni 120 nickel RTDs

 2-, 3-, or 4-wire Cu 10 RTDs

 IEC/NIST/DIN Type B, E, J, K, R, S, T thermocouples

 DIN type L, U thermocouples

 ASTM Type W5Re/W26Re thermocouple

 –10 to 100 millivolts

 2-, 3-, or 4-wire 0 to 2000 ohms

A complete line of temperature sensors, thermowells, and accessory mounting hardware is available from Emerson Process Management.

Fast Key sequence

Section 3: Configuration

March 2014

1, 3, 2, 1, 1

Set output units

Fast Key sequence

The Set Output Unit command establishes the desired primary variable units. The transmitter output can be set to one of the following engineering units:

 Degrees Celsius

 Degrees Fahrenheit

 Degrees Rankine

 Kelvin

 Ohms

 Millivolts

1, 3, 2, 1, 2, 2

50/60 Hz filter

Fast Key sequence

The 50/60 Hz Filter command sets the transmitter electronic filter to reject the AC power supply frequency in the plant.

1, 3, 5, 1

Terminal temperature

Fast Key sequence

1, 3, 2, 2

Configuration

The Terminal Tem p command sets the terminal temperature units to indicate the temperature at the transmitter terminals.

Section 3: Configuration

PNP–1eT–







+

P = previous damped value N = new sensor value T = damping time constant U = update rate

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Process Variable (PV) damping

Fast Key sequence

The PV Damp command changes the response time of the transmitter to smooth variations in output readings caused by rapid changes in input. Determine the damping setting based on the necessary response time, signal stability, and other requirements of the loop dynamics of the system. The default damping value is 5.0 seconds and can be reset to any value between 0 and 32 seconds.

The damping value chosen affects the response time of the transmitter. When it is set to zero (or disabled), the damping function is off and the transmitter output reacts to changes in input as quickly as the intermittent sensor algorithm allows (refer to “Intermittent threshold” on

page 38) for a description of the intermittent sensor algorithm). Increasing the damping value

increases the transmitter response time.

With damping enabled, the transmitter outputs values according to the following relationship. At time t

Damping Value =

Reference Manual

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1, 3, 3, 1, 3

At the time the damping time constant is set, the transmitter output is at 63% of the input change and continues to approach the input according to the damping equation above.

After one damping time constant following a sensor input step change, the transmitter output will be at 63.2% of that change. The output continues to approach the input according to the damping equation above.

For example, as illustrated in Figure 3-1, if the temperature undergoes a step change from 100 degrees to 110 degrees, and the damping is set to 5.0 seconds, the transmitter calculates and reports a new reading using the damping equation. At 5.0 seconds, the transmitter outputs

106.3 degrees, or 63.2% of the input change, and the output continues to approach the input curve according to the equation above.

Figure 3-1. Change in Input vs. Change in Output with Damping Set to Five Seconds

Configuration

Reference Manual

00809-0100-4825, Rev CB

2-Wire RTD offset

The 2-Wire RTD Offset command allows the user to input the measured lead wire resistance, which results in the transmitter adjusting its temperature measurement to correct the error caused by this resistance. Due to a lack of lead wire compensation within the RTD, temperature measurements made with a 2-wire RTD are often inaccurate. See “Sensor lead wire

resistance effect– RTD input” on page 17 for more information.

To utilize this feature:

1. Measure the lead wire resistance of both RTD leads after installing the 2-wire RTD and

2. From the HOME screen, select 1 Device Setup, 3 Configuration, 2Sensor Configuration, 1

3. Enter the total measured resistance of the two RTD leads at the 2-Wire Offset prompt.

Section 3: Configuration

Fast Key sequence

the Rosemount 248.

Sensor 1, 2 Snsr 1 Setup, and 1 2-Wire Offset.

Enter this resistance as a negative (–) value to ensure proper adjustment.The transmitter adjusts its temperature measurement to correct the error caused by lead wire resistance.

1, 3, 2, 1, 2, 1

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3.4.7 Information variables

Access the transmitter information variables on-line using the Field Communicator or other suitable communications device. Following is a list of transmitter information variables which include device identifiers, factory-set configuration variables, and other information. A description of each variable, the corresponding fast key sequence, and a review of its purposes are provided.

Tag

Fast Key sequence

The Ta g variable is the easiest way to identify and distinguish between transmitters in multi-transmitter environments. Use it to label transmitters electronically according to the requirements of the application. The tag defined is automatically displayed when a 375 Field Communicator establishes contact with the transmitter at power-up. The tag may be up to eight characters long and has no impact on the primary variable readings of the transmitter.

Date

Fast Key sequence

The Date command is a user-defined variable that provides a place to save the date of the last revision of configuration information. It has no impact on the operation of the transmitter or the Field Communicator.

1, 3, 4, 1

1, 3, 4, 2

Configuration

Section 3: Configuration

March 2014

Descriptor

Fast Key sequence

The Descriptor variable provides a longer user-defined electronic label to assist with more specific transmitter identification than is available with the tag variable. The descriptor may be up to 16 characters long and has no impact on the operation of the transmitter or the Field Communicator.

Message

Fast Key sequence

The Message variable provides the most specific user-defined means for identifying individual transmitters in multi-transmitter environments. It allows for 32 characters of information and is stored with the other configuration data. The message variable has no impact on the operation of the transmitter or the Field Communicator.

Sensor serial number

Fast Key sequence

Reference Manual

00809-0100-4825, Rev CB

1, 3, 4, 3

1, 3, 4, 4

1, 3, 2, 1, 4

The Sensor S/N variable provides a location to list the serial number of the attached sensor. It is useful for identifying sensors and tracking sensor calibration information.

3.4.8 Diagnostics and service

Test device

Fast Key sequence

The Test Device command initiates a more extensive diagnostics routine than is performed continuously by the transmitter. The Test Device menu lists the following options:

 1 Loop test verifies the output of the transmitter, the integrity of the loop, and the

operations of any recorders or similar devices installed in the loop. See “Loop test” below for more information.

 2 Self Test initiates a transmitter self test. Error codes are displayed if there is a problem.

 3 Master Reset sends out a command that restarts and tests the transmitter. A master

reset is like briefly powering down the transmitter. Configuration data remains unchanged after a master reset.

 4 Status lists error codes. ON indicates a problem, and OFF means there are no

problems.

Loop test

Fast Key sequence

1, 2, 1

1, 2, 1, 1

The Loop Test command verifies the output of the transmitter, the integrity of the loop, and the operations of any recorders or similar devices installed in the loop. To initiate a loop test, perform the following procedure:

Configuration

Reference Manual

00809-0100-4825, Rev CB

1. Connect a reference meter to the transmitter. To do so, shunt

2. From the HOME screen, choose 1 Device Setup, 2 Diag/Serv, 1 Test Device, 1 Loop

3. Choose a discreet milliampere level for the transmitter to output. At the CHOOSE

4. Check the current meter installed in the test loop to verify that it reads the value that

After completing the test procedure, the display returns to the loop test screen and another output value can be chosen.

Master reset

Section 3: Configuration

the transmitter power through the meter at some point in the loop.

Tes t before performing a loop test.

ANALOG OUTPUT prompt, choose 1 4mA, 2 20mA, or choose 3 other to manually input a value between 4 and 20 mA.

was commanded to output. If the readings do not match, either the transmitter requires an output trim or the current meter is malfunctioning.

Fast Key sequence

1, 2, 1, 3

March 2014

Master Reset resets the electronics without actually powering down the unit. It does not return the transmitter to the original factory configuration.

Active calibrator

Fast Key sequence

The Active Calibrator Mode command enables or disables the pulsating current feature. The transmitter ordinarily operates with pulsating current so that sensor diagnostic functions, such as open sensor detection and EMF compensation, can be performed correctly. Some calibration equipment requires steady current to function properly. By enabling the Active Calibrator Mode the transmitter stops sending pulsating current to the sensor and supplies a steady current. Disabling the Active Calibrator returns the transmitter to the normal operating state where it sends a pulsating current to the sensor, enabling the sensor diagnostic functions.

The Active Calibrator Mode is volatile and is automatically disabled when power is cycled, or when a Master Reset is performed using the Field Communicator.

Note

The Active Calibrator Mode must be disabled before returning the transmitter to the process to ensure that the full diagnostic capabilities of the Rosemount 248 are available.

Disabling or enabling the Active Calibrator Mode will not change any of the sensor trim values stored in the transmitter.

1, 2, 2, 1, 3

Configuration

Sensor review

Fast Key sequence

The Signal Condition command allows viewing or changing of the primary variable lower and upper range values, sensor percent of range, and sensor damping.

1, 4, 2

Section 3: Configuration

March 2014

Write protect

Fast Key sequence

The Write Protect command protects the transmitter configuration data from accidental or unwarranted changes. To enable the write protect feature:

1. From the HOME screen choose 1 Device Setup, 2 Diag/Service, 3 Write Protect.

2. Choose Enable WP.

Note

To disable write protect on the Rosemount 248, repeat the procedure, replacing Enable WP with Disable WP.

HART output

Fast Key sequence

The HART Output command allows the user to make changes to the multidrop address, initiate burst mode, or make changes to the burst options.

Reference Manual

00809-0100-4825, Rev CB

1, 2, 3

1, 3, 3, 3

Alarm and saturation

Fast Key sequence

The Alarm/Saturation command allows the alarm settings (Hi or Low) and saturation values to be viewed and changed. To change the alarm values and saturation values, select the value to be changed, either 2 Low Alarm, 3 High Alarm, 4 Low Sat., or 5 High Sat then enter the desired new value, which must fall within the guidelines:

 The low alarm value must be between 3.50 and 3.75 mA

 The high alarm value must be between 21.0 and 23.0 mA

 The low saturation level must be between the low alarm value plus 0.1 mA and 3.9 mA.

Example:

The low alarm value has been set to 3.7 mA. Therefore, the low saturation level, S,

must be 3.8  S  3.9 mA.

 The high saturation level must be between 20.5 mA and the high alarm value minus 0.1

mA.

Example:

The high alarm value has been set to 20.8 mA. Therefore, the low saturation level, S,

must be 20.5  S  20.7 mA.

See “Failure mode” on page 14 for Failure Mode considerations.

1, 3, 3, 2

Rerange

Reranging the transmitter sets the measurement range to the limits of expected readings which maximizes transmitter performance; the readings are is most accurate when the transmitter is operated within the expected temperature range for the application.

Configuration

Reference Manual

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PV range values

The PV URV and PV LRV commands, found on the PV Range Values menu screen, allow the user to set the transmitter’s lower and upper range values using limits of expected readings. The range of expected readings is defined by the Lower Range Value (LRV) and Upper Range Value (URV). The transmitter range values can be reset as often as necessary to reflect changing process conditions. From the PV Range Values screen select 1 PV LRV to change the lower range value and 2 PV URV to change the upper range value.

Note:

The rerange functions should not be confused with the trim functions. Although the rerange command matches a sensor input to a 4–20 mA output, as in conventional calibration, it does not affect the transmitter’s interpretation of the input.

Intermittent sensor detect (advanced feature)

The Intermittent Sensor Detect feature guards against process temperature readings caused by intermittent open sensor conditions (an intermittent sensor condition is an open sensor condition that lasts less than one update). By default, the transmitter is shipped with the Intermittent Sensor Detect feature switched ON and the threshold value set to 0.2% of sensor limits. The Intermittent Sensor Detect feature can be switched ON or OFF and the threshold value can be changed to any value between 0 and 100% of the sensor limits with a Field Communicator.

Fast Key sequence

Section 3: Configuration

March 2014

PV URV = 6 PV LRV = 7

Transmitter behavior with intermittent sensor detect ON

When the Intermittent Sensor Detect feature is switched ON, the transmitter can eliminate the output pulse caused by intermittent open sensor conditions. Process temperature changes (T) within the threshold value are tracked normally by the transmitter’s output. A T greater than the threshold value activates the intermittent sensor algorithm. True open sensor conditions cause the transmitter to go into alarm.

The threshold value of the Rosemount 248 should be set at a level allowing for normal range of process temperature fluctuations; too high and the algorithm will not be able to filter out intermittent conditions; too low and the algorithm will be activated unnecessarily. The default threshold value is 0.2% of the sensor limits.

Transmitter behavior with intermittent sensor detect OFF

When the Intermittent Sensor Detect feature is switched OFF, the transmitter tracks all process temperature changes, even if they are the result of an intermittent sensor. (The transmitter behaves as though the threshold value had been set at 100%.) The output delay because of the intermittent sensor algorithm will be eliminated.

Configuration

Section 3: Configuration

0.2 0.4

0.6

0.8 1.0

1.2

1.4

Transmitter output (mA)

Time (seconds)

When Intermittent Sensor Detect is OFF, a false temperature output is possible when an open sensor condition is detected. A false temperature output in either direction up to the threshold value (100 % of sensor limits if Intermittent Sensor Detect is OFF) is possible when an open sensor condition is detected.

Normal open sensor responses

High alarm

March 2014

Intermittent threshold

Fast Key sequence

The threshold value can be changed from the default value of 0.2%. Turning the Intermittent Sensor Detect feature OFF or leaving it ON and increasing the threshold value above the default does not affect the time needed for the transmitter to output the correct alarm signal after detecting a true open sensor condition. However, the transmitter may briefly output a false temperature reading for up to one update in either direction (see Figure 3-3 on page 39) up to the threshold value (100% of sensor limits if Intermittent Sensor Detect is OFF). Unless rapid response rate is necessary, the suggested setting of the Intermittent Sensor Detect mechanism is ON with 0.2% threshold.

Figure 3-2. Open Sensor Response

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1, 3, 5, 4

Open sensor holdoff

Fast Key sequence

The Open Sensor Holdoff option, at the normal setting, enables the Rosemount 248 to tolerate heavy EMI disturbances without producing brief periods of alarm. This is accomplished through the software by having the transmitter perform additional verification of the open sensor status prior to activating the transmitter alarm. If the additional verification shows that the open sensor condition is not valid, the transmitter will not go into alarm.

For users of the Rosemount 248 that desire a more immediate open sensor detection, the Open Sensor Holdoff option can be changed to a fast setting. On this setting, the transmitter reports an open sensor condition without additional verification of the open condition.

1, 3, 5, 3

Configuration

Reference Manual

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3.5 Multidrop communication

Multidropping refers to the connection of several transmitters to a single communications transmission line. Communication between the host and the transmitters takes place digitally with the analog output of the transmitters deactivated.

Many Rosemount transmitters can be multidropped. With the HART communications protocol, up to 15 transmitters can be connected on a single twisted pair of wires or over leased phone lines.

A Field Communicator can test, configure, and format a multidropped Rosemount 248 transmitter in the same way as in a standard point-to-point installation.

The application of a multidrop installation requires consideration of the update rate necessary from each transmitter, the combination of transmitter models, and the length of the transmission line. Each transmitter is identified by a unique address (1–15) and responds to the commands defined in the HART protocol.

Figure 3-3. Typical Multidropped Network

Section 3: Configuration

March 2014

Configuration

A. Rosemount 248 HART transmitter E. 4-20 mA B. Power supply F. HA RT i nterfac e C. Power supply impedance G. Computer or DCS D. 250  H. Handheld terminal

Figure 3-3 shows a typical multidrop network. Do not use this figure as an installation diagram.

Contact Emerson Process Management product support with specific requirements for multidrop applications.

Note

Rosemount 248 transmitters are set to address 0 at the factory, which allows them to operate in the standard point-to-point manner with a 4–20 mA output signal. To activate multidrop communication, the transmitter address must be changed to a number between 1 and 15. This change deactivates the 4–20 mA analog output and sets it to 4 mA and disables the current failure mode.

Section 3: Configuration

March 2014

00809-0100-4825, Rev CB

3.6 Rosemount 248 Configuration Interface specifications

3.6.1 Configuration software

The 248 PC-based configuration software for the Rosemount 248 allows comprehensive configuration of the transmitters. Used in conjunction with various Rosemount or user-supplied hardware modems, the software provides the tools necessary to configure the Rosemount 248 transmitters including the following parameters:

 Process Variable

 Sensor Type

 Number of Wires

 Engineering Units

 Transmitter Tag Information

 Damping

Reference Manual

 Alarming Parameters

3.6.2 Configuration hardware

The 248 Configuration Interface has three hardware options as follows:

Software only

Customer must provide appropriate communications hardware (modem, power supply, etc.)

Serial HART modem and software

Serial HART modem. Customer must provide separate loop power supply and resistor. Requires PC serial port. Suitable for use with powered loops.

USB HART modem and software

USB (Universal Serial Bus) HART modem. Customer must provide separate loop power supply and resistor. Requires PC with USB port. Suitable for use with powered loops.

Configuration

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Section 3: Configuration

3.6.3 Rosemount 248 PC Programmer Kit installation

1. Install all necessary software for Rosemount 248 PC configuration:

a. Install the Rosemount 248C software

– Place the 248C CD-ROM in the drive

– Run setup.exe from Windows NT, 2000, or XP

b. Install the MACTek HART Modem drivers completely before beginning bench

configuration with the Rosemount 248 PC Programming system.

Note

For USB modem: Upon first use, configure appropriate COM ports within the Rosemount 248PC software by choosing Port Settings from the Communicate menu. The USB modem driver emulates a COM port and will add to available port selections in the software’s drop-down box. Otherwise software defaults to first available COM port, which may not be correct.

2. Set up configuration system hardware:

a. Hook up the transmitter and load resistor (250-1100 ohms) wired in series with the

power supply. (The Rosemount 248 device will need an external power supply of 12-42.4 Vdc for configuration)

b. Attach the HART Modem in parallel with the load resistor and connect it to the PC

March 2014

Please see Tab l e 3 - 3 for spares kit and re-order numbers.

Table 3-3. Rosemount 248 Programming Kit Spare Part Numbers

Product description Part number

Programming Software (CD) 00248-1603-0002

Rosemount 248 Programmer Kit - USB 00248-1603-0003

Rosemount 248 Programmer Kit - Serial 00248-1603-0004

Configuration

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Section 4: Operation and Maintenance

Section 4 Operation and maintenance

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 43

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 44

Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 46

Diagnostic messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 47

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.

March 2014

4.1.1 Warnings

Failure to follow these installation guidelines could result in death or serious injury.

 Make sure only qualified personnel perform the installation.

Explosions could result in death or serious injury.

 Do not remove the connection head cover in explosive atmospheres when the

circuit is live.

 Before connecting a Field Communicator in an explosive atmosphere, make sure the

instruments in the loop are installed in accordance with intrinsically safe or non-incendive field wiring practices.

 When sending or requesting data that would disrupt the loop or change the output of

the transmitter, set the process application loop to manual.

 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.

Operation and Maintenance

Section 4: Operation and Maintenance

March 2014

4.2 Calibration

Calibrating the transmitter increases measurement precision by allowing corrections to be made to the factory-stored characterization curve by digitally altering the transmitter’s interpretation of the sensor input.

To understand calibration, it is necessary to realize that smart transmitters operate differently from analog transmitters. An important difference being that smart transmitters are factory-characterized, meaning they are shipped with a standard sensor curve stored in the transmitter firmware. In operation, the transmitter uses this information to produce a process variable output, in engineering units, dependent on the sensor input.

Calibration of the Rosemount 248 may include the following procedures:

 Sensor Input Trim: digitally alter the transmitter’s interpretation of the input signal

 Output Trim: calibrates the transmitter to a 4–20 mA reference scale

 Scaled Output Trim: calibrates the transmitter to a user-selectable reference scale.

4.2.1 Trim the transmitter

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One or more of the trim functions may be used when calibrating. The trim functions are as follows

 Sensor Input Trim

 Output Trim

 Output Scaled Trim

Sensor input trim

Fast Key sequence

Perform a sensor trim if the transmitters digital value for the primary variable does not match the plant’s standard calibration equipment. The sensor trim function calibrates the sensor to the transmitter in temperature units or raw units. Unless your site-standard input source is NIST-traceable, the trim functions will not maintain the NIST-traceability of the system.

The Sensor Input Trim command allows the transmitter’s interpretation of the input signal to be digitally altered (see <HotXRef>Figure 4-1). The sensor input calibration trims the combined sensor and transmitter system to a site standard using a known temperature source. Sensor trimming is suitable for validation procedures or for applications that require calibrating the sensor and transmitter together.

1, 2, 2, 1, 1

Operation and Maintenance

Reference Manual

Microprocessor

Digital-to-Analog Signal Conversion

Analog-to-Digital

Signal Conversion

Transmitter Electronics Module

Analog

Input

Analog Output

Field

Communicator

HART

Output

Sensor and Ohm/mV Trim adjust the signal here

Output and Scaled Output Trim adjust the signal here

00809-0100-4825, Rev CB

To perform a sensor trim with a Rosemount 248:

1. Connect the calibration device or sensor to the transmitter. Refer to Figure 2-6 on

2. Connect the communicator to the transmitter loop.

3. From the Home screen, select 1 Device Setup, 2 Diag/Service, 2Calibration, 1Sensor 1

4. Set the control loop to manual and select OK.

5. Answer the Active Calibration question.

6. Select 1Lower Only or 2 Lower and Upper at the SELECT SENSOR TRIM POINTS prompt.

7. Adjust the calibration device to the desired trim value (must be within the selected

Section 4: Operation and Maintenance

March 2014

page 16 or inside of the transmitter terminal side cover for sensor wiring diagrams. If

using an active calibrator, please see “Active calibrator” on page 35.

Tri m , 1Sensor 1 Input Trim to prepare to trim the sensor.

sensor limits). If a combined sensor and transmitter system are being trimmed, expose the sensor to a known temperature and allow the temperature reading to stabilize. Use a bath, furnace or isothermal block, measured with a site-standard thermometer, as the known temperature source.

8. Select OK when the temperature stabilizes. The communicator displays the output

value the transmitter associates with the input value provided by the calibration device.

9. Enter the lower or upper trim point, depending on the selection in Step 6.

Output trim or scaled output trim

Perform an output trim or a scaled output trim if the digital value for the primary variable matches the plant’s standards, but the transmitter’s analog output does not match the reading on the output device. The output trim function calibrates the transmitter to a 4–20 mA reference scale; the scaled output trim function calibrates to a user-selectable reference scale. To determine the need for an output trim or a scaled output trim, perform a loop test as shown on page 34.

Figure 4-1. Dynamics of Smart Temperature Measurement

Operation and Maintenance

Section 4: Operation and Maintenance

March 2014

Output trim

Fast Key sequence

The D/A Trim command allows the transmitter’s conversion of the input signal to a 4–20 mA output to be altered (see Figure 4-1 on page 45). Adjust the analog output signal at regular intervals to maintain measurement precision. To perform a digital-to-analog trim:

1. From the HOME screen, select 1Device setup, 2 Diag/Service, 2Calibration, 2D/A trim.

Set the control loop to manual and select OK.

2. Connect an accurate reference meter to the transmitter at the CONNECT REFERENCE

METER prompt by shunting the power to the transmitter through the reference meter at some point in the loop. Select OK after connecting the reference meter.

3. Select OK at the SETTING FLD DEV OUTPUT TO 4 MA prompt, then transmitter outputs

4.00 mA.

4. Record the actual value from the reference meter, and enter it at the ENTER METER

VALUE prompt. The communicator prompts the user to verify whether or not the output value equals the value on the reference meter.

Reference Manual

00809-0100-4825, Rev CB

1, 2, 2, 2

5. If the reference meter value equals the transmitter output value, select 1 Yes and go to

Step 6. If the reference meter value is not equal to the transmitter output value, select 2

No and go to Step 4.

6. Select OK at the SETTING FLD DEV OUTPUT TO 20 MA prompt and repeat steps 4 and 5

until the reference meter value equals the transmitter output value.

7. Return the control loop to automatic control and select OK.

Scaled output trim

Fast Key sequence

The Scaled D/A Trim command matches the 4 and 20 mA points to a user-selectable reference scale other than 4 and 20 mA (2–10 volts, for example). To perform a scaled D/A trim, connect an accurate reference meter to the transmitter and trim the output signal to scale as outlined in the Output trim procedure.

4.3 Hardware

4.3.1 Maintenance

The Rosemount 248 has no moving parts and requires minimal scheduled maintenance.

1, 2, 2, 3

Sensor checkout

To determine whether the sensor is at fault, replace it with another sensor or connect a test sensor locally at the transmitter to test remote sensor wiring. Do not remove the thermowell while in operation consult the factory for a replacement special sensor and transmitter combination.

. Select any standard, off-the-shelf sensor for use with a Rosemount 248, or

Operation and Maintenance

Reference Manual

00809-0100-4825, Rev CB

4.4 Diagnostic messages

4.4.1 Hardware

If a malfunction is suspected, despite the absence of diagnostics messages on the Field Communicator display, follow the procedures described in Ta bl e 4 - 1 to verify that transmitter hardware and process connections are in good working order. Under each of four major symptoms, specific suggestions are offered for solving the problem.

Table 4-1. Rosemount 248 Troubleshooting Chart

Potential

Symptom

Tra n sm it te r Does Not Communicate with Field Communicator

source

Loop Wiring

Corrective action

 Check for a minimum of 250 ohms resistance between the power

supply and Field Communicator connection.

 Check for adequate voltage to the transmitter. If a Field Communicator

is connected and 250 ohms resistance is in the loop, the transmitter requires a minimum of 12.0 V at the terminals to operate (over entire

3.75 to 23 mA operating range).

Section 4: Operation and Maintenance

March 2014

High Output Sensor Input

Failure or Connection

Loop Wiring

Power Supply

Electronics Module

Erratic Output Loop Wiring

 Check for intermittent shorts, open circuits, and multiple grounds.

 Specify the transmitter by tag number. For certain non-standard

transmitter installations, it may be necessary, because of excessive line length, to specify the transmitter tag number to initiate communications.

 Connect a Field Communicator and enter the transmitter test mode to

isolate a sensor failure.

 Check for a sensor open or short circuit.

 Check the process variable to see if it is out of range.  Check for dirty or defective terminals, interconnecting pins, or

receptacles.

 Check the output voltage of the power supply at the transmitter

terminals. It should be 12.0 to 42.4 V dc (over entire 3.75 to 23 mA operating range).

 Connect a Field Communicator and enter the transmitter status mode

to isolate module failure.

 Connect a 375 Field Communicator and check the sensor limits to

ensure calibration adjustments are within the sensor range.

 Check for adequate voltage to the transmitter. It should be 12.0 to

42.4 V dc at the transmitter terminals (over entire 3.75 to 23 mA operating range).

Electronics Module

Operation and Maintenance

 Check for intermittent shorts, open circuits, and multiple grounds.

 Connect a Field Communicator and enter the Loop test mode to

generate signals of 4 mA, 20 mA, and user-selected values.

 Connect a Field Communicator and enter the transmitter test mode to

isolate module failure.

Section 4: Operation and Maintenance

March 2014

Potential

Symptom

source

Corrective action

Reference Manual

00809-0100-4825, Rev CB

Low Output or No Output

Sensor Element

Loop Wiring

Electronics Module

 Connect a Field Communicator and enter the Transmitter test mode to

isolate a sensor failure.

 Check the process variable to see if it is out of range.  Check for adequate voltage to the transmitter. It should be 12.0 to

42.4 V dc (over entire 3.75 to 23 mA operating range).

 Check for shorts and multiple grounds.

 Check for proper polarity at the signal terminal.

 Check the loop impedance.

 Connect a Field Communicator and enter the Loop test mode.

 Check wire insulation to detect possible shorts to ground.  Connect a Field Communicator and check the sensor limits to ensure

calibration adjustments are within the sensor range.

 Connect a Field Communicator and enter the Transmitter test mode to

isolate an electronics module failure.

Operation and Maintenance

Reference Manual

00809-0100-4825, Rev CB

Section 4: Operation and Maintenance

March 2014

4.4.2 Field communicator

Ta bl e 4 - 2 provides a guide to Field Communicator diagnostic messages.

Variable parameters within the text of a message are indicated with the notation <variable

parameter>. Reference to the name of another message is identified by the notation [another message].

Table 4-2. Field Communicator Diagnostics Messages

Message Description

Add item for ALL device types or only for this ONE device type

Command Not Implemented The connected device does not support this function.

Communication Error Either a device sends back a response indicating that the message it received was

Configuration memory not compatible with connected device

Device Busy The connected device is busy performing another task.

Device Disconnected Device fails to respond to a command.

Device write protected Device is in write-protect mode. Data can not be written.

Device write protected. Do you still want to shut off?

Display value of variable on hotkey menu?

Download data from configuration memory to device

Exceed field width Indicates that the field width for the current arithmetic variable exceeds the device-

Exceed precision Indicates that the precision for the current arithmetic variable exceeds the device-

Ignore next 50 occurrences of status? Asked after displaying device status. Softkey answer determines whether next 50

Illegal character An invalid character for the variable type was entered.

Illegal date The day portion of the date is invalid.

Illegal month The month portion of the date is invalid.

Illegal year The year portion of the date is invalid.

Incomplete exponent The exponent of a scientific notation floating point variable is incomplete.

Incomplete field The value entered is not complete for the variable type.

Looking for a device Polling for multidropped devices at addresses 1–15.

Mark as read only variable on hotkey menu?

No device configuration in configuration memory

No Device Found Poll of address zero fails to find a device, or poll of all addresses fails to find a device

No hotkey menu available for this device.

No offline devices available. There are no device descriptions available to be used to configure a device offline.

Asks the user whether the hot key item being added should be added for all device types or only for the type of device that is connected.

unintelligible, or the Field Communicator cannot understand the response from the device.

The configuration stored in memory is incompatible with the device to which a transfer has been requested.

Device is in write-protect mode. Press YES to turn the Field Communicator off and lose the unsent data.

Asks whether the value of the variable should be displayed adjacent to its label on the hotkey menu if the item being added to the hotkey menu is a variable.

Prompts user to press SEND softkey to initiate a memory to device transfer.

specified description edit format.

occurrences of device status will be ignored or displayed.

Asks whether the user should be allowed to edit the variable from the hotkey menu if the item being added to the hotkey menu is a variable.

There is no configuration saved in memory available to re-configure off-line or transfer to a device.

if auto-poll is enabled.

There is no menu named “hotkey” defined in the device description for this device.

Operation and Maintenance

Section 4: Operation and Maintenance

March 2014

Reference Manual

00809-0100-4825, Rev CB

Message Description

No simulation devices available. There are no device descriptions available to simulate a device.

No UPLOAD_VARIABLES in ddl for this device

No Valid Items The selected menu or edit display contains no valid items.

OFF KEY DISABLED Appears when the user attempts to turn the Field Communicator off before sending

Online device disconnected with unsent data. RETRY or OK to lose data.

Out of memory for hotkey configuration. Delete unnecessary items.

Overwrite existing configuration memory

Press OK. Press the OK softkey. This message usually appears after an error message from the

Restore device value? The edited value that was sent to a device was not properly implemented. Restoring

Save data from device to configuration memory

Saving data to configuration memory.

Sending data to device. Data is being transferred from configuration memory to a device.

There are write only variables which have not been edited. Please edit them.

There is unsent data. Send it before shutting off?

Too few data bytes received Command returns fewer data bytes than expected as determined by the device

Tra nsmi tter Fault Device returns a command response indicating a fault with the connected device.

Units for <variable label> has changed. Unit must be sent before editing, or invalid data will be sent.

Unsent data to onlin e device. SEND or LOSE data

Use up/down arrows to change contrast. Press DONE when done.

Value out of range The user-entered value is either not within the range for the given type and size of

<message> occurred reading/writing <variable label>

<variable label> has an unknown value. Unit must be sent before editing, or invalid data will be sent.

There is no menu named “upload_variables” defined in the device description for this device. This menu is required for offline configuration.

modified data or before completing a method.

There is unsent data for a previously connected device. Press RETRY to send data, or press OK to disconnect and lose unsent data.

There is no more memory available to store additional hotkey items. Unnecessary items should be deleted to make space available.

Requests permission to overwrite existing configuration either by a device-to-memory transfer or by an offline configuration. User answers using the softkeys.

application or as a result of HART communications.

the device value returns the variable to its original value.

Prompts user to press SAVE softkey to initiate a device-to-memory transfer.

Data is being transferred from a device to configuration memory.

There are write-only variables which have not been set by the user. These variables should be set or invalid values may be sent to the device.

Press YES to send unsent data and turn the Field Communicator off. Press NO to turn the Field Communicator off and lose the unsent data.

description.

The engineering units for this variable have been edited. Send engineering units to the device before editing this variable.

There is unsent data for a previously connected device which must be sent or thrown away before connecting to another device.

Gives direction to change the contrast of the Field Communicator display.

variable or not within the min/max specified by the device.

Either a read/write command indicates too few data bytes received, transmitter fault, invalid response code, invalid response command, invalid reply data field, or failed pre- or post-read method; or a response code of any class other than SUCCESS is returned reading a particular variable.

A variable related to this variable has been edited. Send related variable to the device before editing this variable.

Operation and Maintenance

Reference Manual

00809-0100-4825, Rev CB

Appendix A: Specifications and reference data

March 2014

Appendix A Specifications and reference

data

Transmitter specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 51

Sensor specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 57

Dimensional drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 60

Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 62

A.1 Transmitter specifications

A.1.1 Functional specifications

Inputs

User-selectable. See “Transmitter accuracy and ambient temperature effects” on page 55 for sensor options.

Output

2-wire 4–20 mA, linear with temperature or input; digital output signal superimposed on 4– 20 mA signal, available for a Field communicator or control system interface

Isolation

Input/output isolation tested to 500 Vac rms (707 Vdc) at 50/60 Hz

Power supply

An external power supply is required. The transmitter operates on 12.0 to 42.4 Vdc transmitter terminal voltage with load resistance between 250 and 1100 ohms. A minimum of 17.75 Vdc power supply is required with a load of 250 ohms. Transmitter power terminals are rated to

42.4 Vdc. A Field Communicator requires a loop resistance between 250 and 1100 ohms. Do not communicate with the transmitter when power is below 12 Vdc at the transmitter terminals.

Humidity limits

0–99% relative humidity, non-condensing

NAMUR recommendations

The Rosemount 248 meets the following NAMUR recommendations:

 NE 21 – Electromagnetic compatibility (EMC) for Process and Laboratory Apparatus

 NE 43 – Standard of the signal level breakdown information of digital transmitters

 NE 89 – Standard of temperature transmitters with digital signal processing

Specifications and Reference Data

Appendix A: Specifications and reference data

March 2014

Transient protection

The Rosemount 470 prevents damage from transients induced by lightning, welding, heavy electrical equipment, or switch gears. Refer to the Rosemount 470 Product Data Sheet (Document No. 00813-0100-4191) for more information.

Temperature limits

Operating limit

 –40 to 185 °F (–40 to 85 °C)

Storage limit

 –58 to 248 °F (–50 to 120 °C)

Turn-on time

Performance within specifications in less than 5.0 seconds after power is applied to transmitter, when damping value is set to zero seconds.

Reference Manual

00809-0100-4825, Rev CB

Update rate

Less than 0.5 seconds

Custom alarm and saturation levels

Custom factory configuration of alarm and saturation levels is available with option code C1 for valid values. These values can also be configured in the field using a Field Communicator.

Software detected failure mode

The values at which the transmitter drives its output in failure mode depends on whether it is configured to standard, custom, or NAMUR-compliant (NAMUR recommendation NE 43) operation. The values for standard and NAMUR-compliant operation are as follows:

Table A-1. Operation Parameters

Standard

Linear Output: 3.9  I  20.5 3.8  I  20.5

Fail High: 21  I  23 (default) 21  I  23 (default)

Fail Low: I  3.75 I  3.6

(1) Measured in milliamperes.

(1)

NAMUR NE43- Compliant

Certain hardware failures, such as microprocessor failures, will always drive the output to greater than 23 mA.

(1)

Specifications and Reference Data

Reference Manual

00809-0100-4825, Rev CB

A.1.2 Physical specifications

Field communicator connections

Communication Terminal: Clips permanently fixed to the terminals

Materials of construction

Electronics housing

 Noryl

Universal (option code U) and Rosemount Connection (option code A) Heads

 Housing: Low-copper aluminum (option codes U and A)

 Paint: Polyurethane

 Cover O-Ring: Buna–N

BUZ Head (option code B)

glass reinforced

Stainless Steel (option codes G and H)

Appendix A: Specifications and reference data

March 2014

 Housing: Aluminum

 Paint: Aluminum lacquer

 O-Ring Seal: Rubber

Mounting

The Rosemount 248R attaches directly to a wall or a DIN rail. The Rosemount 248H installs in a connection head or universal head mounted directly on a sensor assembly or apart from a sensor assembly using a universal head. The Rosemount 248H can also mount to a DIN rail using an optional mounting clip.

Weight

Code Options Weight

248H Head Mount Transmitter 42 g (1.5 oz)

248R Rail Mount Transmitter 250g (8.8 oz)

U Universal Head 520 g (18.4 oz)

B BUZ Head 240 g (8.5 oz)

C Polypropylene Head 90 g (3.2 oz)

A Rosemount Connection Head 524 g (18.5 oz)

S Polished Stainless Steel Head 537 g (18.9 oz)

G Rosemount Connection Head (SST) 1700 g (60 oz)

H Universal Head (SST) 1700 g (60 oz)

Specifications and Reference Data

Appendix A: Specifications and reference data

March 2014

Enclosure ratings

Reference Manual

00809-0100-4825, Rev CB

The Universal (option code U) and Rosemount Connection (option code A) Heads are NEMA 4X, IP66, and IP68. The Universal Head with head (option code B) is IP54.

/2-in. NPT threads is CSA Enclosure Type 4X. The BUZ

A.1.3 Performance specifications

EMC (ElectroMagnetic Compatibility) NAMUR NE21 Standard

The Rosemount 248 meets the requirements for NAMUR NE21 Rating.

Susceptibility Parameter Influence

ESD

Radiated 80 – 1000 MHz at 10 V/m AM None

Burst 1 kV for I.O. None

Surge

Conducted 150 kHz to 80 MHz at 10 V None

CE mark

The Rosemount 248 meets all requirements listed under IEC 61326: Amendment 1, 1998.

6 kV contact discharge 8 kV air discharge

0.5 kV line–line 1 kV line–ground

None

Power supply effect

Less than ±0.005% of span per volt

Vibration effect

The Rosemount 248 is tested to the following specifications with no effect on performance:

Frequency Vibration

10 to 60 Hz 0.21 mm displacement

60 to 2000 Hz 3 g peak acceleration

Stability

For RTD and thermocouple inputs, the transmitter will have a stability of ±0.1% of reading or 0.1 °C (whichever is greater) for twelve months.

Self calibration

The analog-to-digital measurement circuitry automatically self-calibrates for each temperature update by comparing the dynamic measurement to extremely stable and accurate internal reference elements.

Specifications and Reference Data

Reference Manual

1234234 12 34 1234

2-wire

RTD and 

3-wire*

RTD

and 

4-wire

RTD

and 

T/C

and mV

00809-0100-4825, Rev CB

Sensor connections

* Rosemount Inc. provides 4-wire sensors for all single element RTDs. You can use these RTDs in 3-wire

Transmitter accuracy and ambient temperature effects

Note

The accuracy and ambient temperature effect is the greater of the fixed and percent of span values (see example below).

Appendix A: Specifications and reference data

March 2014

Rosemount 248 Sensor connections diagram

configurations by leaving the unneeded leads disconnected and insulated with electrical tape.

Specifications and Reference Data

Appendix A: Specifications and reference data

March 2014

Reference Manual

00809-0100-4825, Rev CB

Table A-2. Rosemount 248 Transmitter input Options, Accuracy, and Ambient Temperature Effects

Temperature effects per

1.0 °C (1.8 °F) change in

ambient temperature

Sensor Trans mitter input ranges

(1)

Accuracy

(2)

°C °F Fixed

% of

span

Fixed

% of

span

2-, 3-, 4-wire RTDs

(3)

Pt 100

Pt 200

Pt 500

Pt 1000

Ni 120

Cu 10

( = 0.00385)

(4)

( = 0.003916)

(3)

(5)

(6)

–200 to 850 –328 to 1562 0.2 °C (0.36 °F) ±0.1 0.006 °C (0.011 °F) ±0.004 –200 to 645 –328 to 1193 0.2 °C (0.36 °F) ±0.1 0.006 °C (0.011 °F) ±0.004

–200 to 850 –328 to 1562 1.17 °C (2.11 °F) ±0.1 0.018 °C (0.032 °F) ±0.004

–200 to 850 –328 to 1562 0.47 °C (0.85 °F) ±0.1 0.018 °C (0.032 °F) ±0.004

–200 to 300 –328 to 572 0.23 °C (0.41 °F) ±0.1 0.010 °C (0.018 °F) ±0.004

–70 to 300 –94 to 572 0.16 °C (0.29 °F) ±0.1 0.004 °C (0.007 °F) ±0.004

–50 to 250 –58 to 482 2 °C (3.60 °F) ±0.1 0.06 °C (0.108 °F) ±0.004

Cu 50 ( = 0.00428) -185 to 200 -365 to 392 0.68 °C (1.22 °F) ±0.1 0.012 °C (0.022 °F) ±0.004 Cu 100 ( = 0.00428) -185 to 200 -365 to 392 0.34 °C (0.61 °F) ±0.1 0.006 °C (0.011 °F) ±0.004 Cu 50 ( = 0.00426) -50 to 200 -122 to 392 0.68 °C (1.22 °F) ±0.1 0.012 °C (0.022 °F) ±0.004 Cu 100 ( = 0.00426) -50 to 200 -122 to 392 0.34 °C (0.61 °F) ±0.1 0.006 °C (0.011 °F) ±0.004 PT 50 ( = 0.00391) -200 to 550 -392 to 1022 0.40 °C (0.72 °F) ±0.1 0.012 °C (0.022 °F) ±0.004 PT 100 ( = 0.00391) -200 to 550 -392 to 1022 0.20 °C (0.36 °F) ±0.1 0.006 °C (0.011 °F) ±0.004

Thermocouples

(8)(9)

Type B

(8)

Type E

(8)

Type J

(8)(10)

Type K

(8)

Type N

(8)

Type R

(8)

Type S

(1) Input ranges are for transmitter only. Actual sensor (RTD or Thermocouple) operating ranges may be more limited. See “Sensor specifications” on page -57

Appendix A: Sensor specificationsfor temperature ranges.

(2) Change in ambient is with reference to the calibration temperature of the transmitter at 68 °F (20 °C) from factor y. (3) IEC 751, 1995. (4) JIS 1604, 1981. (5) Edison Curve No. 7. (6) Edison Copper Winding No. 15. (7) Total accuracy for thermocouple measurement: sum of accuracy +0.5 °C. (8) NIST Monograph 175, IEC 584. (9) Fixed accuracy for NIST Type B is ±5.4 °F (±3.0 °C) from 212 to 572 °F (100 to 300 °C). (10) Fixed accuracy for NIST Type K is ±1.3 °F (±0.7 °C) from -292 to -130 °F (-130 to -90 °C).

(7)

100 to 1820 212 to 3308 1.5 °C (2.70 °F) ±0.1 0.056 °C (0.101 °F) ±0.004

–50 to 1000 –58 to 1832 0.4 °C (0.72 °F) ±0.1 0.016 °C (0.029 °F) ±0.004

–180 to 760 –292 to 1400 0.5 °C (0.90 °F) ±0.1 0.016 °C (0.029 °F) ±0.004

–180 to 1372 –292 to 2502 0.5 °C (0.90 °F) ±0.1 0.02 °C (0.036 °F) ±0.004

–200 to 1300 –328 to 2372 0.8 °C (1.44 °F) ±0.1 0.02 °C (0.036 °F) ±0.004

0 to 1768 32 to 3214 1.2 °C (2.16 °F) ±0.1 0.06 °C (0.108 °F) ±0.004

0 to 1768 32 to 3214 1 °C (1.80 °F) ±0.1 0.06 °C (0.108 °F) ±0.004

Transmitter accuracy example

When using a Pt 100 (a = 0.00385) sensor input with a 0 to 100 °C span: Accuracy would be ±0.2 °C.

Specifications and Reference Data

Reference Manual

0.220.06

+ 0.21=

00809-0100-4825, Rev CB

Transmitter temperature effects example

Transmitters can be installed in locations where the ambient temperature is between –40 and 85 °C (–40 and 185 °F). In order to maintain excellent accuracy performance, each transmitter is individually characterized over this ambient temperature range at the factory.

When using a Pt 100 ( = 0.00385) sensor input with a 0-100 °C span at 30 °C ambient temperature-Temperature Effects: 0.006 °C x (30 - 20) = 0.06 °C

Total transmitter error

Worst Case Transmitter Error: Accuracy + Temperature Effects = 0.2 °C + 0.06 °C = 0.26 °C

Total Probable Transmitter Error:

A.2 Sensor specifications

Appendix A: Specifications and reference data

March 2014

A.2.1 Thermocouples – IEC 584

Applicable to sensors offered in Table A-3 on page A-57

Construction

Rosemount DIN plate and 1/2-in. adapter style thermocouples are manufactured from selected materials to meet IEC 584 Tolerance Class 1. The junction of these wires is laser-welded to form a pure joint, maintaining circuit integrity and ensuring highest accuracy.

Lead wires

Internal – 18 SWG (16 AWG) solid wire (max), 19 SWG (18 AWG) solid wire (min.). External extension leads, type J and K – 0.8 mm minimum stranded wire, PTFE insulation. Color coded per IEC 584

Insulation resistance

1000 megaohms minimum insulation resistance when measured at 500 Vdc at room temperature.

Table A-3. Characteristics of DIN Plate and

Characteristics Type J Type K

/2-in. NPT Adapter Style Thermocouples

Specifications and Reference Data

Alloys (wire color) Fe (+ black), CuNi (- white) NiCr (+ green), NiAl (- white)

Sheath Material 1.4541 (AISI 321) Inconel 600

Tem p Rang e (°C) – 40 to 750 – 40 to 1000

Tolerance, DIN EN 60584-2 ±1.5 °C or ±0.4% of measured temp, whichever is greater

Appendix A: Specifications and reference data

March 2014

A.2.2 Thermocouples – ASTM E- 230

Applicable to sensors offered in Table A-4 on page A-58

Construction

Rosemount 1/2-in. adapter style thermocouples are manufactured using ISA Type J or K wire with special limits of error accuracy. The junction of these wires is fusion-welded to form a pure joint, to maintain the integrity of the circuit and to ensure the highest accuracy.

Lead wires

Thermocouple, internal – 16 AWG solid wire (max), 18 AWG solid wire (min.). External lead wire – 20 AWG wire, PTFE insulation. Color coded per ASTM E-230

Insulation resistance

100 megaohms minimum insulation resistance when measured at 100 Vdc at room temperature

Table A-4. Characteristics of DIN Plate and

/2-in. NPT Adapter Style Thermocouples

Reference Manual

00809-0100-4825, Rev CB

Characteristics Type J Typ e K

Alloys (wire color) Iron/Constantan (white/red) Chromel/Alumel (yellow/red)

Tem p Rang e 0 to 760 °C (32 to 1400 °F) 0 to 1150°C (32 to 2102 °F)

To le ra nc e ±1.1 °C or ±0.4% of measured

Sheath Material 304 SST Inconel

A.2.3 RTDs

Sensor type

100 ohm RTD at 0 °C,  = 0.00385 ohms/ohm/°C.

Accuracy

Meets IEC 751 Class B tolerances

Temperature range

–50 to 450 °C (–58 to 842 °F)

Self heating

temp, whichever is greater

± 1.1 °C or ±0.4% of measured temp, whichever is greater

0.15 °K/mW when measured per method defined in DIN EN 60751:1996 or 16 mW minimum power dissipation required to cause a 1 °C (1.8 °F) temperature measurement error in water flowing at 0.91 m/s (3 ft/s)

Specifications and Reference Data

Reference Manual

00809-0100-4825, Rev CB

Thermal response time

9 seconds maximum required to reach 50% sensor response when tested in flowing water according to IEC 751 or 12 seconds maximum required to reach 63.2% sensor response in water flowing at 0.91 m/s (3 ft/s).

Immersion error

60 mm minimum usable depth of immersion when tested according to IEC 751.

Insulation resistance

500 megaohms minimum insulation resistance when measured at 500 V dc at room temperature.

Sheath material

321 SST with mineral-insulated cable construction.

Appendix A: Specifications and reference data

March 2014

Lead wires

PTFE insulated, coated 22 gauge stranded copper wire.

A.2.4 Thermowells

Materials

Barstock Thermowells: 316L SST (1.4404)

Tubular Thermowells: 1.4571 (316 Ti)

Construction

Thermowell bodies are either machined from solid barstock or manufactured using swaged tubes. Flange mounts are seal welded to the thermowell body with the exception of Class 900 flanges and above, which are full penetration welded. Surface finish of machined stems is 0.8 m (32  in. CLA.N6).

Material certification (option code Q8) and pressure testing (option code R01) are available. Flanged thermowells generally conform to the specifications of ASME B 16.5 (ANSI), DIN 2519, 2527, 2633, 2635, and DIN 2526 Type C

Other thermowell materials and styles are available in Volume 1, 2, and 3 of the Temperature Sensor and Accessories Product Data Sheet.

Specifications and Reference Data

Appendix A: Specifications and reference data

123.5 (4.86)

95.25 (3.75)

25.9

(1.02

48.77

(1.92)

44 (1.7)

33 (1.3)

12.9 (0.51)

24.5

(0.97)

104

(4.09)

100

(3.93)

(3.07)

Approval Label

84 (3.331)

118

(4.65)

95.35 (3.75)

72 (2.84)

(3.74)

96 (3.76)

112 (4.41)

SST “U” Bolt Mounting, 2-inch Pipe

Approval

Label

(2.93)

March 2014

A.3 Dimensional drawings

Reference Manual

00809-0100-4825, Rev CB

Rosemount 248R Railmount

Rosemount 248H Headmount Transmitter

Tra ns mitt er

Dimensions are in millimeters (inches)

Enclosures

Connection head BUZ and polypropylene heads

(option codes B and C)

and mini SST head (option code S)

(enlarged)

Universal head

(1)

(option codes H and U)

(1) A “U” Bolt is shipped with each universal head unless a sensor is ordered assembled to the enclosure. However, since the head can be integrally mounted to the sensor it may

not need to be used.

Specifications and Reference Data

Reference Manual

25 (1.0)

BUZ Connection Head

40 (1.6)

60 (2.3)

Connection Head

60 (2.3)*

Universal Head

e w

gs o

lab

0.61 m (2 ft.) Configuration Leads

38 (1.5)

1.83 m (6 ft.) Ribbon Cable

84 (3.3)

114(4.5)

00809-0100-4825, Rev CB

Examples of 248 Transmitter and sensor assemblies with thermowells

Appendix A: Specifications and reference data

March 2014

Tubular thermowell and

DIN plate style sensor

N = Extension Length, U= Thermowell Immersion Length, Dimensions are in millimeters (inches)

Barstock thermowell, nipple-union

Barstock thermowell and

extension, and

DIN plate style sensor

* 80 (3.2) for Class 900 flanges and larger

SEE ORDERING TABLES FOR MORE ASSEMBLY OPTIONS

/2-in. NPT spring loaded

sensor

Specifications and Reference Data

248C configuration interface

Option 1: HART Interface Box

Appendix A: Specifications and reference data

March 2014

Reference Manual

00809-0100-4825, Rev CB

A.4 Ordering information

Table A-5. 248 Headmount temperature transmitter

★ The Standard offering represents the most common options. The starred options (★) should be selected for best delivery.

__The Expanded offering is subject to additional delivery lead time.

Model Product description

248 Tem perature Tran smit ter

Transmitter type

Standard Standard

H DIN B Head Mount ★

Transmitter ou tput

Standard Standard

A 4–20 mA with Digital Signal based on HART Protocol ★

Product certifications Enclosure option codes permitted

Standard Standard

E5 FM Explosion-Proof A, U, G, H ★

I5 FM Intrinsic Safety and Class I, Division 2 A, B, U, N, C, G, S, H ★

K5 FM Intrinsic Safety, Explosion-Proof, and Class I, Division 2 A, U, G, H ★

I6 CSA Intrinsic Safety and Class I, Division 2 A, B, U, N, C, G, H ★

K6 CSA Intrinsic Safety, Explosion-Proof, and Class I, Division 2A, U, G, H ★

E1 ATE X Fl ameproof A, U, G, H ★

I1 ATEX Intrinsic Safety A, B, U, N,C, G, S, H ★

ND ATE X Dust A, U, G, H ★

N1 ATEX Type n A, U, G, H ★

(1)

E7 IECEx Flameproof and Dust A, U, G, H ★

I7 IECEx Intrinsic Safety A, B, U, N, C, G, S, H ★

N7 IECEx Type n A, U, G, H ★

NG IECEx Type n Component N ★

NA No Approvals All Options ★

ATEX Type n Component N ★

Enclosures Material IP rating

Standard Standard

A Connection Head Aluminum IP66/68 ★

B BUZ Head Aluminum IP65 ★

C BUZ Head Polypropylene IP65 ★

G Connection Head SST IP66/IP68 ★

H Universal Head (Junction Box) SST IP66/IP68 ★

U Universal Head (Junction Box) Aluminum IP66/IP68 ★

N No Enclosure

Expanded

F Sanitary Connection Head, DIN A Polished SST IP66/IP68

S Sanitary Connection Head, Din B Polished SST IP66/IP68

Specifications and Reference Data

Reference Manual

00809-0100-4825, Rev CB

Appendix A: Specifications and reference data

March 2014

Table A-5. 248 Headmount temperature transmitter

★ The Standard offering represents the most common options. The starred options (★) should be selected for best delivery.

__The Expanded offering is subject to additional delivery lead time.

Conduit entry size

(2)

Standard Standard

(3)

0 No Enclosure ★

M20 x 1.5 (CM20) ★

/2-inch NPT ★

Assemble to options

Standard Standard

XA Sensor Specified Separately and Assembled to Transmitter ★

NS No Sensor ★

Options (Include with selected model number)

Alarm level configuration

Standard Standard

A1 NAMUR alarm and saturation levels, high alarm ★

CN NAMUR alarm and saturation levels, low alarm ★

5-point calibration

Standard Standard

C4 5-Point Calibration (Requires the Q4 option code to generate a Calibration Certificate) ★

Calibration certificate

Standard Standard

Q4 Calibration Certificate (3-Point standard) ★

External ground

Standard Standard

G1 External Ground Lug Assembly ★

Line filter

Standard Standard

F6 60 Hz line Voltage Filter ★

Conduit electrical connector

Standard Standard

(4)(2)

M12, 4 pin, Male Connector (eurofast®) ★

(2)

A-size Mini, 4 pin, Male Connector (minifast®) ★

External label

Standard Standard

EL External Label for ATEX Intrinsic Safety ★

Specifications and Reference Data

Appendix A: Specifications and reference data

March 2014

Reference Manual

00809-0100-4825, Rev CB

Table A-5. 248 Headmount temperature transmitter

★ The Standard offering represents the most common options. The starred options (★) should be selected for best delivery.

__The Expanded offering is subject to additional delivery lead time.

Cover chain option

Standard

G3 Cover Chain ★

Software configuration

Standard

C1 Custom Configuration of Date, Descriptor, Message and Wireless Paramaters (Requires CDS with order) ★

Standard

Typical model number: 248H A I1 A 1 DR N080 T08 EL U250 CN

(1) The 248H with ATEX Type n Component Approval is not approved as a stand alone unit, additional system certification is required. Transmitter must be installed so it

is protected to at least the requirements of IP54. (2) All process connection threads are 1/2 in. NPT, except for Enclosure Codes H and U with Conduit Entry Code 1 and Sensor Type Code NS (3) For enclosures H and U with the XA option specified, a 1/2-in. NPT to M20 x 1.5 thread adapter is used. (4) Available with Intrinsically Safe approvals only for FM Intrinsically Safe or Non-Incendive approval (Option Code I5). To maintain NEMA 4X rating, it must be installed

according to Rosemount Drawing 03151-1009.

Specifications and Reference Data

Reference Manual

00809-0100-4825, Rev CB

Appendix B: Product Certifications

Appendix B Product Certifications

Approved Manufacturing Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 65

European Directive Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 65

Ordinary Location Certification from FM Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 65

Installation drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 72

B.1 Approved Manufacturing Locations

Rosemount Inc. – Chanhassen, Minnesota, USA

Rosemount Temperature GmbH – Germany

Emerson Process Management Asia Pacific – Singapore

March 2014

B.2 European Directive Information

A copy of the EC Declaration of Conformity can be found at the end of the Quick Start Guide. The most recent revision of the EC Declaration of Conformity can be found at www.rosemount.com.

B.3 Ordinary Location Certification from FM

Approvals

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

B.3.1 North America

E5 FM Explosionproof, Dust-Ignitionproof, and Nonincendive

Certificate: 3016555 Standards Used: FM Class 3600:1998, FM Class 3611:2004, FM Class 3615:1989, FM Class 3810:2005, ANSI/ISA 60079-0:2009, ANSI/ISA 60079-11:2009, IEC 60529: 2001, NEMA 250: 1991 Markings: XP CL I, DIV 1, GP B, C, D; DIP CL II/III, DIV 1, GP E, F, G when installed per Rosemount drawing 00248-1065. T5(-40 °C T6(-40 °C 00248-1055; Type 4X; IP66/68

 T

 +40 °C), T5(-40 °C Ta +75 °C) when installed per Rosemount drawing

T

+85 °C); NI CL1, DIV 2, GP A, B, C, D



Product Certifications

Appendix B: Product Certifications

March 2014

I5 FM Intrinsic Safety and Nonincendive

Certificate: 3016555 Standards Used: FM Class 3600:1998, FM Class 3610:2010, FM Class 3611:2004, FM Class 3810:2005, ANSI/ISA 60079-0:2009, ANSI/ISA 60079-11:2009, IEC 60529: 2001, NEMA 250: 1991 Markings: IS CL I/II/III, DIV 1, GP A, B, C, D, E, F, G; NI CL1, DIV 2, GP A, B, C, D T6(-40°C

+40 °C), T5(-40 °C T

Type 4X; IP66/68

Special Conditions for Safe Use (X):

1. When no enclosure option is selected, the Model 248 Temperature Transmitter shall be installed in an enclosure meeting the requirements of ANSI/ISA S82.01 and S82.03 or other applicable ordinary location standards

2. No enclosure or Buz Head option cannot be selected to maintain a Type 4X rating

3. Enclosure option must be selected to maintain a Type 4 Rating

I6 CSA Intrinsic Safety and Division 2

Certificate: 1091070 Standards Used: CAN/CSA C22.2 No. 0-M90, CSA Std. C22.2 No. 25-1966, CAN/CSA C22.2 No. 94-M91, CAN/CSA C22.2 No. 157-92, CSA C22.2 No. 213-M1987, C22.2 No 60529-05 Markings: IS CL I, DIV 1 GP A, B, C, D when installed per Rosemount drawing 00248-1056; Suitable for CL I DIV 2 GP A, B, C, D when installed per Rosemount drawing 00248-1055; T6(-50 °C “A”, “G”, “H”, “U”; Seal not required (See drawing 00248-1066)

Reference Manual

00809-0100-4825, Rev CB

+75 °C) when installed per Rosemount drawing 00248-1055;

T

+40 °C), T5(-50 °C Ta +60 °C); Type 4X, IP66/68 for enclosure options

T

K6 CSA Explosionproof, Intrinsic Safety, and Division 2

Certificate: 1091070 Standards Used: CAN/CSA C22.2 No. 0-M90, CSA Std. C22.2 No. 25-1966, CSA Std. C22.2 No. 30-M1986, CAN/CSA C22.2 No. 94-M91, CSA Std. C22.2 No.142-M1987, CAN/CSA C22.2 No. 157-92, CSA C22.2 No. 213-M1987, C22.2 No 60529-05 Markings: XP CL I/II/III, DIV 1, GP B, C, D, E, F, G when installed per Rosemount drawing 00248-1066; IS CL I, DIV 1 GP A, B, C, D when installed per Rosemount drawing 00248-1056; Suitable for CL I DIV 2 GP A, B, C, D when installed per Rosemount drawing 00248-1055; T6(-50 °C enclosure options “A”, “G”, “H”, “U”; Seal not required (See drawing 00248-1066)

B.3.2 Europe

E1 AT EX Flamepro of

Certificate: FM12ATEX0065X Standards Used: EN 60079-0: 2012, EN 60079-1: 2007, EN 60529:1991 +A1:2000 Markings: II 2 G Ex d IIC T6…T1 Gb, T6(-50 °C See Ta bl e B - 1 at the end of the Product Certifications section for Process Temperatures

T

+40 °C), T5(-50 °C Ta +60 °C); Type 4X, IP66/68 for

T

+40 °C), T5…T1(-50 °C Ta +60 °C);

Product Certifications

Reference Manual

00809-0100-4825, Rev CB

I1 ATEX Intrinsic Safet y

Appendix B: Product Certifications

March 2014

Special Conditions for Safe Use (X):

1. See certificate for ambient temperature range

2. The non-metallic label may store an electrostatic charge and become a source of ignition in Group III environments

3. Guard the LCD display cover against impact energies greater than 4 joules

4. Consult the manufacturer if dimensional information on the flameproof joints is necessary

Certificate: Baseefa03ATEX0030X Standards Used: EN 60079-0: 2012, EN 60079-11: 2012 Markings: II 1 G Ex ia IIC T5/T6 Ga, T5(-60 °C

T

+80 °C), T6(-60 °C Ta +60 °C);

See Ta bl e B - 2 at the end of the Product Certifications section for Entity Parameters

Special Conditions for Safe Use (X):

1. The apparatus must be installed in an enclosure which affords it a degree of protection of at least IP20. Non-metallic enclosures must have a surface resistance of less than 1G; light allow or zirconium enclosures must be protected from impact and friction when installed.

N1 ATEX Type n - with enclosure

Certificate: BAS00ATEX3145 Standards Used: EN 60079-0:2012, EN 60079-15:2010 Markings: II 3 G Ex nA IIC T5 Gc (-40 °C

T

+70 °C);

NC ATEX Type n - without enclosure

Certificate: Baseefa13ATEX0045X Standards Used: EN 60079-0:2012, EN 60079-15:2010 Markings: II 3G Ex nA IIC T5/T6 Gc, T5(-60 °C

T

 +80 °C), T6(-60 °C Ta  +60 °C);

Special Conditions for Safe Use (X):

1. The Model 248 Temperature Transmitter must be installed in a suitably certified enclosure such that it is afforded a degree of protection of at least IP54 in accordance with IEC 60529 and EN 60079-15

ND ATEX Dust

Certificate: FM12ATEX0065X Standards Used: EN 60079-0: 2012, EN 60079-31: 2009, EN 60529:1991 +A1:2000 Markings: II 2 D Ex tb IIIC T130°C Db, (-40 °C

T

+70 °C); IP66

See Ta bl e B - 1 at the end of the Product Certifications section for Process Temperatures

Special Conditions for Safe Use (X):

1. See certificate for ambient temperature range

Product Certifications

2. The non-metallic label may store an electrostatic charge and become a source of ignition in Group III environments

3. Guard the LCD display cover against impact energies greater than 4 joules

4. Consult the manufacturer if dimensional information on the flameproof joints is necessary

Appendix B: Product Certifications

March 2014

B.3.3 International

E7 IECEx Flameproof and Dust

Certificate: IECEx FMG 12.0022X Standards Used: IEC 60079-0:2011, IEC 60079-1:2007-04, IEC 60079-31:2008 Markings: Ex d IIC T6…T1 Gb, T6(-50 °C Ex tb IIIC T130°C Db, (-40 °C See Ta bl e B - 1 at the end of the Product Certifications section for Process Temperatures

Special Conditions for Safe Use (X):

1. See certificate for ambient temperature range

2. The non-metallic label may store an electrostatic charge and become a source of ignition in Group III environments

3. Guard the LCD display cover against impact energies greater than 4 joules

4. Consult the manufacturer if dimensional information on the flameproof joints is necessary

I7 IECEx Intrinsic Safety

Certificate: IECEx BAS 07.0086X Standards Used: IEC 60079-0:2011, IEC 60079-11:2011 Markings: Ex ia IIC T5/T6 Ga, T5(-60 °C SeeTa bl e B - 2 at the end of the Product Certifications section for Entity Parameters

T

 +70 °C); IP66;

Reference Manual

00809-0100-4825, Rev CB

T

+40 °C), T5…T1(-50 °C Ta +60 °C);

T

+80 °C), T6(-60 °C Ta +60 °C);

Special Conditions for Safe Use (X):

N7 IECEx Type n - with enclosure

Certificate: IECEx BAS 07.0055 Standards Used: IEC 60079-0:2011, IEC 60079-15:2010 Markings: Ex nA IIC T5 Gc; T5(-40 °C

T

+70 °C)

NG IECEx Type n - without enclosure

Certificate: IECEx BAS 13.0029X Standards Used: IEC 60079-0:2011, IEC 60079-15:2010 Markings: Ex nA IIC T5/T6 Gc; T5(-60 °C

T

+80 °C), T6(-60 °C Ta +60 °C)

Special Conditions for Safe Use (X):

Product Certifications

Reference Manual

00809-0100-4825, Rev CB

B.3.4 China

E3 China Flameproof

Certificate: GYJ11.1534 Standards Used: GB3836.1-2010, GB3836.2-2010 Markings: Ex d IIC T6 Gb (-40 °C

Special Conditions for Safe Use (X):

T

+65 °C)

Appendix B: Product Certifications

March 2014

1. Ambient temperature range is: -40 °C

T

+65 °C

2. The earth connection facility in the enclosure should be connected reliably.

3. During installation, there should be no mixture harmful to flameproof housing.

4. During installation in hazardous location, cable glands, conduits and blanking plugs, certified by state-appointed inspection bodies with Ex d IIC Gb degree, should be used.

5. During installation, use and maintenance in explosive gas atmospheres, observe the warning “Do not open when energized”.

6. End user is not permitted to change any components inside, but to settle the problem in conjunction with manufacturer to avoid damage to the product.

7. When installation, use and maintenance of this product, observe the following standards:

GB3836.13-1997 “Electrical apparatus for explosive gas atmospheres Part 13: Repair and overhaul for apparatus used in explosive gas atmospheres”

GB3836.15-2000 “Electrical apparatus for explosive gas atmospheres Part 15: Electrical installations in hazardous area (other than mines)”

GB3836.16-2006 “Electrical apparatus for explosive gas atmospheres Part 16: Inspection and maintenance of electrical installation (other than mines)”

GB50257-1996 “Code for construction and acceptance of electric device for explosion atmostpheres and fire hazard electrical equipment installation engineering”

I3 China Intrinsic Safety

Product Certifications

Certificate: GYJ11.1535X Standards Used: GB3836.1-2010, GB3836.4-2010 Markings: Ex ia IIC T5/T6; T5(-60 °C

T

+80 °C), T6(-60 °C Ta +60 °C)

See Ta bl e B - 2 at the end of the Product Certifications section for Entity Parameters

Special Conditions for Safe Use (X):

1. Symbol “X” is used to denote specific conditions of use:

a. The enclosure may contain light metal, attention should be taken to avoid ignition

hazard due to impact or friction

b. The apparatus must be installed in an enclosure which affords it a degree of

protection of at least IP20. Non-metallic enclosures must have a surface resistance of less than 1G.

Appendix B: Product Certifications

March 2014

2. The relation between T code and ambient temperature range is:

T code Temperature range

Reference Manual

00809-0100-4825, Rev CB

T6 -60 °C T

T5 -60 °C T

+60 °C

+80 °C

3.Intrinsically Safe parameters:

HART loop terminals (+ and -)

Maximum input

voltage

(V)

30 130 1.0 3.6 0

Maximum input

current

(mA)

Maximum input

power

(W)

Maximum internal

Ci (nF) Li (mH)

The above supply must be derived from a linear supply.

Sensor terminals (1 to 4)

Maximum

output voltage

(V)

45 26 290 2.1 0

Maximum

output current

(mA)

Maximum

output power

(W)

Maximum internal

Ci (nF) Li (mH)

Sensor terminals (3 to 6)

parameters

Group

Maximum external parameters

Co (nF) Lo (mH)

IIC 23.8 23.8

IIB 237.9 87.4

IIA 727.9 184.5

4. The product should be used with Ex-certified associated apparatus to establish explosion protection system that can be used in explosive gas atmospheres. Wiring and terminals should comply with the instruction manual of the product and associated apparatus.

5. The cables between this product and associated apparatus should be shielded cables (the cables must have insulated shield). The shielded has to be grounded reliably in non-hazardous area.

6. End user is not permitted to change any components inside, but to settle the problem in conjunction with manufacturer to avoid damage to the product.

7. When installation, use and maintenance of this product, observe the following standards:

GB3836.13-1997 “Electrical apparatus for explosive gas atmospheres Part 13: Repair and overhaul for apparatus used in explosive gas atmospheres”

GB3836.15-2000 “Electrical apparatus for explosive gas atmospheres Part 15: Electrical installations in hazardous area (other than mines)”

Product Certifications

Reference Manual

00809-0100-4825, Rev CB

N3 China Type n

Appendix B: Product Certifications

March 2014

GB3836.16-2006 “Electrical apparatus for explosive gas atmospheres Part 16: Inspection and maintenance of electrical installation (other than mines)”

GB50257-1996 “Code for construction and acceptance of electrical device for explosion atmospheres and fire hazard electrical equipment installation engineering”

Certificate: GYJ101095 Standards Used: GB3836.1-2000, GB3836.8-2003 Markings: Ex nA nL IIC T5(-40 °C

T

+70 °C)

Special Conditions for Safe Use (X):

1. 248 type Temperature Assembly using temperature sensor type 65, 68, 183, 185 are certified.

2. The ambient temperature range is: (-40 °C

3. Maximum input voltage: 42.4 V.

4. Cable glands, conduit or blanking plugs, certified by NEPSI with Exe or Ex n protection type and ½-14NPT or M20x1.5 thread type, should be used on external connections and redundant cable entries.

5. Maintenance should be done in non-hazardous location.

6. End user is not permitted to change any components inside, but to settle the problem in conjunction with manufacturer to avoid damage to the product.

7. When installation, use and maintenance of this product, observe the following standards:

GB3836.13-1997 “Electrical apparatus for explosive gas atmospheres Part 13: Repair and overhaul for apparatus used in explosive gas atmospheres”

GB3836.15-2000 “Electrical apparatus for explosive gas atmospheres Part 15: Electrical installations in hazardous area (other than mines)”

GB3836.16-2006 “Electrical apparatus for explosive gas atmospheres Part 16: Inspection and maintenance of electrical installation (other than mines)”

GB50257-1996 “Code for construction and acceptance of electrical device for explosion atmospheres and fire hazard electrical equipment installation engineering”

B.3.5 Combinations

T

+70 °C)

K5 combination of E5 and I5

Product Certifications

Appendix B: Product Certifications

March 2014

B.3.6 Tables

Table B-1. Process Temperatures

Reference Manual

00809-0100-4825, Rev CB

Temperature

class

T6 -50 °C to +40 °C 55 55 60 65

T5 -50 °C to +60 °C 70 70 70 75

T4 -50 °C to +60 °C 100 110 120 130

T3 -50 °C to +60 °C 170 190 200 200

T2 -50 °C to +60 °C 280 300 300 300

T1 -50 °C to +60 °C 440 450 450 450

Ambient

temperature

No ext. 3 in. 6 in. 9 in.

Table B-2. Entity Parameters

HART loop terminals + and - Sensor terminals 1 to 4

Process temperature w/o LCD display cover (°C)

Voltage U

Current I

Power P

Capacitance C

Inductance L

30 V 45 V

130 mA 26 mA

1 W 290 mW

3.6 nF 2.1 nF

0 mH 0 H

B.4 Installation drawings

The installation guidelines presented by the drawings must be followed in order to maintain certified ratings for installed transmitters.

Rosemount Drawing 00248-1055, Rev AD, 2 Sheets Factory Mutual Intrinsic Safety and Non-Incendive Installation Drawing

Rosemount Drawing 00644-1049, Rev AD, 1 Sheet Factory Mutual Explosion-proof Installation Drawing

Rosemount Drawing 00248-1056, Rev AB, 1 Sheet CSA Explosion-Proof and Non-Incendive Installation Drawing

Rosemount Drawing 00248-1057, Rev AD, 1 Sheet IECEX Intrinsic Safety Installation Drawing

Rosemount Drawing 00644-1059, Rev AE, 1 Sheet CSA Explosion-proof Installation Drawing

Important

Once a device labeled with multiple approval types is installed, it should not be reinstalled using any of the other labeled approval types. To ensure this, the approval label should be permanently marked to distinguish the used from the unused approval type(s).

Product Certifications

Reference Manual

Electronic Master - PRINTED COPIES ARE UNCONTROLLED - Rosemount Proprietary

00809-0100-4825, Rev CB

Appendix B: Product Certifications

March 2014

Figure B-1. FM Intrinsic Safety and Non-Incendive Installation Drawing 00248-1055, Rev. AD (Sheet 1 of 2)

Product Certifications

Appendix B: Product Certifications

Electronic Master - PRINTED COPIES ARE UNCONTROLLED - Rosemount Proprietary

March 2014

Reference Manual

00809-0100-4825, Rev CB

Figure B-2. FM Intrinsic Safety and Non-Incendive Installation Drawing 00248-1055, Rev. AD (Sheet 2 of 2)

Product Certifications

Reference Manual

00809-0100-4825, Rev CB

Appendix B: Product Certifications

Figure B-3. Factory Mutual (FM) Explosion-Proof Installation Drawing 00644-1049, Rev. AD

March 2014

Product Certifications

Appendix B: Product Certifications

Electronic Master - PRINTED COPIES ARE UNCONTROLLED - Rosemount Proprietary

March 2014

Reference Manual

00809-0100-4825, Rev CB

Figure B-4. CSA I Explosion-Proof and Non-Incendive Installation Drawing 00248-1056, Rev. AB

Product Certifications

Reference Manual

00809-0100-4825, Rev CB

Figure B-5. CSA Explosion-Proof Installation Drawing 00644-1059, Rev. AE

Appendix B: Product Certifications

March 2014

Product Certifications

Appendix B: Product Certifications

March 2014

Figure B-6. IECEx Intrinsic Safety Installation Drawing 00248-1057, Rev. AD

Reference Manual

00809-0100-4825, Rev CB

Electronic Master - PRINTED COPIES ARE UNCONTROLLED - Rosemount Proprietary

Product Certifications

Reference Manual

00809-0100-4825, Rev CB

Index

March 2014

Numerics

375 Field Communicator . . . . . . . . . . . . . . . . . . . . . . 25

AMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Apply Changes . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Trim the Transmitter. . . . . . . . . . . . . . . . . . . . . . 44

Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Set the Loop to Manual . . . . . . . . . . . . . . . . . . . . 24

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2-Wire RTD Offset . . . . . . . . . . . . . . . . . . . . . . . . 33

50/60 Hz Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Check Output . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Process Variables. . . . . . . . . . . . . . . . . . . . . 30

Diagnostics and Service . . . . . . . . . . . . . . . . . . . 34

Active Calibrator . . . . . . . . . . . . . . . . . . . . . 35

Alarm and Saturation . . . . . . . . . . . . . . . . . 36

HART Output . . . . . . . . . . . . . . . . . . . . . . . . 36

Intermittent Threshold . . . . . . . . . . . . . . . . 37

Loop Test . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Master Reset . . . . . . . . . . . . . . . . . . . . . . . . 35

Open Sensor Holdoff . . . . . . . . . . . . . . . . . . 38

PV Range Values . . . . . . . . . . . . . . . . . . . . . 36

Sensor Detect . . . . . . . . . . . . . . . . . . . . . . . 37

Sensor Review . . . . . . . . . . . . . . . . . . . . . . . 35

Test Device . . . . . . . . . . . . . . . . . . . . . . . . . 34

Write Protect . . . . . . . . . . . . . . . . . . . . . . . . 35

Information Variables . . . . . . . . . . . . . . . . . . . . . 33

Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Descriptor . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Message. . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Sensor Serial Number . . . . . . . . . . . . . . . . . 34

Tag. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

PV Damping . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Review Configuration Data . . . . . . . . . . . . . . . . . 30

Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Select Sensor Type . . . . . . . . . . . . . . . . . . . . . . . 31

Set Output Units . . . . . . . . . . . . . . . . . . . . . . . . . 31

Terminal Temperature . . . . . . . . . . . . . . . . . . . . 31

Variable Mapping . . . . . . . . . . . . . . . . . . . . . . . . 30

Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Temperature Effects . . . . . . . . . . . . . . . . . . . 4

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Special Mounting . . . . . . . . . . . . . . . . . . . . . 3

Diagnostic Messages . . . . . . . . . . . . . . . . . . . . . . . . . 47

Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . 60

Drawings

Dimensional . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Failure Mode Switch . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Ground the Transmitter . . . . . . . . . . . . . . . . . . . . . . . 19

Grounded

Thermocouple Inputs . . . . . . . . . . . . . . . . . 21

Ungrounded

mV Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . 19

RTD/Ohm Inputs . . . . . . . . . . . . . . . . . . . . . 19

Thermocouple Inputs . . . . . . . . . . . . . . . . . 19

Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Sensor Checkout . . . . . . . . . . . . . . . . . . . . . 46

HART Fast Key Sequence . . . . . . . . . . . . . . . . . . . . . . 28

HART Menu Tree. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Hazardous Certifications . . . . . . . . . . . . . . . . . . . . . . 66

Hazardous Locations Certifications

Brazilian Approval

European Approvals . . . . . . . . . . . . . . . . . . . . . . 66

. . . . . . . . . . . . . . . . . . . . . . . . 68

Index-79

Index

March 2014

Reference Manual

00809-0100-4825, Rev CB

Installation

Asia Pacific . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

European. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Head Mount

DIN Plate Style Sensor. . . . . . . . . . . . . . . . . 10

Threaded Sensor . . . . . . . . . . . . . . . . . . . . . 11

North American . . . . . . . . . . . . . . . . . . . . . . . . . 11

Rail mount transmitters . . . . . . . . . . . . . . . . . . . 13

Integral mount sensor. . . . . . . . . . . . . . . . . 12

Threaded sensor . . . . . . . . . . . . . . . . . . . . . 13

South American . . . . . . . . . . . . . . . . . . . . . . . . . 11

Installation Drawings . . . . . . . . . . . . . . . . . . . . . . . . . 72

Model 275 HART Communicator

Check Output . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Diagnostics and Service . . . . . . . . . . . . . . . . . . . 34

Fast Key Sequence . . . . . . . . . . . . . . . . . . . . . . . 28

HART Menu Tree. . . . . . . . . . . . . . . . . . . . . . . . . 26

Information Variables. . . . . . . . . . . . . . . . . . . . . 33

Review Configuration Data. . . . . . . . . . . . . . . . . 30

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

To a DIN Rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Multidrop Communication . . . . . . . . . . . . . . . . . . . . 39

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Grounding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Surges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Return of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Sensor Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Millivolt Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Ohm Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

RTD Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Thermocouple Inputs . . . . . . . . . . . . . . . . . . . . . 16

Sensor Wiring Diagrams. . . . . . . . . . . . . . . . . . . . . . . 16

Set the Loop to Manual . . . . . . . . . . . . . . . . . . . . . . . 24

Specifications

ASTME 230 Thermocouples

Construction . . . . . . . . . . . . . . . . . . . . . . . . 58

Insulation Resistance . . . . . . . . . . . . . . . . . 58

Lead Wires. . . . . . . . . . . . . . . . . . . . . . . . . . 58

Functional

Alarm Levels . . . . . . . . . . . . . . . . . . . . . . . . 52

Failure Mode . . . . . . . . . . . . . . . . . . . . . . . . 52

Humidity Limits. . . . . . . . . . . . . . . . . . . . . . 51

Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

NAMUR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Power Supply . . . . . . . . . . . . . . . . . . . . . . . 51

Saturation Levels. . . . . . . . . . . . . . . . . . . . . 52

Temperature Limits . . . . . . . . . . . . . . . . . . 52

Transient Protection . . . . . . . . . . . . . . . . . . 52

Turn-on Time . . . . . . . . . . . . . . . . . . . . . . . 52

Update Rate . . . . . . . . . . . . . . . . . . . . . . . . 52

IEC 584 Thermocouples

Construction

Insulation Resistance . . . . . . . . . . . . . . . . . 57

Lead Wires. . . . . . . . . . . . . . . . . . . . . . . . . . 57

Performance

Ambient Temperature . . . . . . . . . . . . . . . . 55

CE Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

EMC Standard . . . . . . . . . . . . . . . . . . . . . . . 54

Power Supply Effect . . . . . . . . . . . . . . . . . . 54

Self Calibration . . . . . . . . . . . . . . . . . . . . . . 54

Sensor Connections . . . . . . . . . . . . . . . . . . 55

Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Vibration Effect . . . . . . . . . . . . . . . . . . . . . . 54

Physical

Enclosure Ratings . . . . . . . . . . . . . . . . . . . . 54

HART Connections . . . . . . . . . . . . . . . . . . . 53

Materials of Construction . . . . . . . . . . . . . . 53

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

RTD

Accuracy

Immersion Error . . . . . . . . . . . . . . . . . . . . . 59

Insulation Resistance . . . . . . . . . . . . . . . . . 59

Lead Wires. . . . . . . . . . . . . . . . . . . . . . . . . . 59

Self Heating. . . . . . . . . . . . . . . . . . . . . . . . . 58

Sensor Type. . . . . . . . . . . . . . . . . . . . . . . . . 58

Sheath Material. . . . . . . . . . . . . . . . . . . . . . 59

Temperature Range . . . . . . . . . . . . . . . . . . 58

Thermal Response Time . . . . . . . . . . . . . . . 59

Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

RTD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Thermocouples. . . . . . . . . . . . . . . . . . . . . . 57

Thermowells . . . . . . . . . . . . . . . . . . . . . . . . 59

Thermowells

Construction

Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

. . . . . . . . . . . . . . . . . . . . . . . . 57

. . . . . . . . . . . . . . . . . . . . . . . . . . . 58

. . . . . . . . . . . . . . . . . . . . . . . . 59

Index-80

Reference Manual

00809-0100-4825, Rev CB

Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Functional . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Performance . . . . . . . . . . . . . . . . . . . . . . . . 54

Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Surges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Failure Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Trim the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . 44

Output Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Scaled Output Trim . . . . . . . . . . . . . . . . . . . . . . . 46

Sensor Input Trim . . . . . . . . . . . . . . . . . . . . . . . . 44

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Loop Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Sensor Wiring Diagrams . . . . . . . . . . . . . . . . . . . 16

Index

March 2014

Index-81

Reference Manual

00809-0100-4825, Rev CB

March 2014

Standard Terms and Conditions of Sale can be found at www.rosemount.com/terms_of_sale The Emerson logo is a trademark and service mark of Emerson Electric Co. Rosemount. the Rosemount logotype, and SMART FAMILY are registered trademarks of Rosemount Inc. Coplanar is a trademark of Rosemount Inc.

Halocarbon is a trademark of the Halocarbon Products Corporation.o. Fluorinert is a registered trademark of Minnesota Mining and Manufacturing Company Corporation

Syltherm 800 and D.C. 200 are registered trademarks of Dow Corning Corporation. Neobee M-20 is a registered trademark of PVO International, Inc. HART is a registered trademark of the HART Communication Foundation. Foundation fieldbus is a registered trademark of the Fieldbus Foundation. All other marks are the property of their respective owners.

Emerson Process Management

Rosemount Measurement 8200 Market Boulevard Chanhassen MN 55317 USA Tel (USA) 1 800 999 9307 Tel (International) +1 952 906 8888 Fax +1 952 906 8889

Emerson Process Management Latin America

1300 Concord Terrace, Suite 400 Sunrise Florida 33323 USA Tel + 1 954 846 5030

Emerson Process Management GmbH & Co.

Argelsrieder Feld 3 82234 Wessling Germany Tel 49 (8153) 9390 Fax 49 (8153) 939172

Emerson Process Management Asia Pacific Private Limited

1 Pandan Crescent Singapore 128461 T (65) 6777 8211 F (65) 6777 0947 Enquiries@AP.EmersonProcess.com

Beijing Rosemount Far East Instrument Co., Limited

No. 6 North Street, Hepingli, Dong Cheng District Beijing 100013, China T (86) (10) 6428 2233 F (86) (10) 6422 8586

Rosemount 248H Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Content

1Section 1: Introduction

2Section 2: Installation

3Section 3: Configuration

4Section 4: Operation and maintenance

Section 1 Introduction

1.1 Safety messages

1.2 Overview

1.3 Considerations

1.4 Return of materials

1.5 Product recycling/disposal

Section 2 Installation

2.1 Safety messages

2.2 Mounting

2.3 Installation

2.4 Multichannel installations

2.5 Set the switches

2.6 Wiring

2.7 Power supply

Section 3 Configuration

3.1 Safety messages

3.2 Commissioning

3.3 AMS

3.4 Field communicator

3.5 Multidrop communication

3.6 Rosemount 248 Configuration Interface specifications

Section 4 Operation and maintenance

4.1 Safety messages

4.2 Calibration

4.3 Hardware

4.4 Diagnostic messages

A.1 Transmitter specifications

A.2 Sensor specifications

A.3 Dimensional drawings

A.4 Ordering information

Appendix B Product Certifications

B.1 Approved Manufacturing Locations

B.2 European Directive Information

B.4 Installation drawings