Rosemount 848T Operating Manual

Reference Manual

00809-0100-4697, Rev GA

November 2014

Rosemount 848T High Density Temperature Transmitter with FOUNDATION™ fieldbus

Device Revision 8

Reference Manual

00809-0100-4697, Rev GA

Rosemount 848T High Density Temperature Transmitter with F

Title Page

November 2014

OUNDATION

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

™

fieldbus

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.]

Title Page

November 2014

Reference Manual

00809-0100-4697, Rev GA

Reference Manual

00809-0100-4697, Rev GA

1Section 1: Introduction

2Section 2: Installation

Contents

November 2014

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

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

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

1.2.1 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.2 Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.3 Service support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

2.1 Safety messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

2.1.1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

2.2 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

2.2.1 Mounting to a DIN rail without an enclosure. . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2.2 Mounting to a panel with a junction box . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

2.2.3 Mounting to a 2-in. pipe stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.3 Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3.1 Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3.2 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

2.3.3 Surges/transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

2.4 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

2.5 Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

2.6 Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

2.7 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

2.7.1 Using cable glands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

2.7.2 Using conduit entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

3Section 3: Configuration

3.1 Safety messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

3.1.1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

3.2 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

3.2.1 Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

3.2.2 Transmitter configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

3.2.3 Custom configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

3.2.4 Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

3.2.5 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

3.2.6 Damping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Contents

3.2.7 Configure the differential sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

3.2.8 Configure measurement validation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

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3.3 Common configurations for high density applications. . . . . . . . . . . . . . . . . . . . . .22

3.3.1 Interfacing analog transmitters to Foundation fieldbus . . . . . . . . . . . . . . .25

3.4 Block configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

3.4.1 Resource block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

3.4.2 Field Diagnostics & PlantWeb Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

3.4.3 PlantWeb alerts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

3.4.4 Recommended actions for PlantWeb alerts . . . . . . . . . . . . . . . . . . . . . . . . .35

3.4.5 Field Diagnostics Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

3.4.6 Recommended actions for field diagnostics alerts. . . . . . . . . . . . . . . . . . . .40

3.4.7 Transducer blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

3.4.8 Transducer block sub-parameter tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

4Section 4: Operation and Maintenance

4.1 Safety messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

4.1.1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

4.2 Foundation™ fieldbus information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

4.2.1 Commissioning (addressing) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

4.3 Hardware maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

4.3.1 Sensor check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

4.3.2 Communication/power check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

4.3.3 Resetting the configuration (RESTART) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

4.4 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

4.4.1 Foundation fieldbus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

4.4.2 Resource block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

4.4.3 Transducer block troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

AAppendix A: Reference Data

A.1 Functional specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

A.1.1 Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

A.1.2 Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

A.1.3 Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

A.1.4 Ambient temperature limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

A.1.5 Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

A.1.6 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

A.1.7 Transient protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

A.1.8 Update time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

A.1.9 Humidity limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

A.1.10Turn-on time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

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A.1.11Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

A.1.12Backup Link Active Scheduler (LAS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

A.2 Physical specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

A.2.1 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

A.2.2 Entries for optional junction box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

A.2.3 Environmental ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

A.3 Function blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

A.3.1 Analog input (AI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

A.3.2 Input selector (ISEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

A.3.3 Multiple analog input block (MAI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

A.4 Performance specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

A.4.1 Stability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

A.4.2 Self calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

A.4.3 Vibration effect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

A.4.4 Electromagnetic compatibility compliance testing . . . . . . . . . . . . . . . . . . .60

A.4.5 Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

A.4.6 Differential configuration notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61

A.4.7 Accuracy for differential configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61

A.4.8 Analog sensors 4–20mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61

A.4.9 Ambient temperature effect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62

A.4.10Ambient temperature effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62

A.4.11Ambient temperature notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

A.5 Dimensional drawings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

A.5.1 Mounting options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66

A.6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

BAppendix B: Product Certificates

B.1 North American Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

B.1.1 European Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

B.2 Intrinsically Safe and Non-Incendive installations . . . . . . . . . . . . . . . . . . . . . . . . . .78

B.3 Installation drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

Contents

CAppendix C: Foundation™ fieldbus Technology

C.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

C.2 Function blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

C.3 Device descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90

C.4 Block operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91

C.4.1 Instrument- specific function blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91

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C.4.2 Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91

C.5 Network communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91

C.5.1 LAS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92

C.5.2 Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

C.5.3 Scheduled transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94

C.5.4 Unscheduled transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95

C.5.5 Function block scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96

DAppendix D: Function Blocks

D.1 Analog Input (AI) function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97

D.1.1 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

D.1.2 AI block troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

D.2 Multiple analog input (MAI) function block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

D.2.1 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

D.2.2 MAI block troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

D.3 Input selector function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

D.3.1 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

D.3.2 ISEL block troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Contents

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Section 1 Introduction

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 ( ). Refer to the following safety messages before performing an operation preceded by this symbol.

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.

Process leaks could result in death or serious injury.

 Do not remove the thermowell while in operation. Removing while in operation may

cause process fluid leaks.

 Install and tighten thermowells and sensors before applying pressure, or process

leakage may result.

Electrical shock could cause death or serious injury.

 If the sensor is installed in a high voltage environment and a fault condition or

installation error occurs, high voltage may be present on transmitter leads and terminals.

 Use extreme caution when making contact with the leads and terminals.

Section 1: Introduction

November 2014

1.2 Overview

1.2.1 Transmitter

The Rosemount 848T is optimal for process temperature measurement because of its ability to simultaneously measure eight separate and independent temperature points with one transmitter. Multiple temperature sensor types may be connected to each transmitter. In addition, the 848T can accept 4-20 mA inputs. The enhanced measurement capability of the

848T allows it to communicate these variables to any F configuration tool.

1.2.2 Manual

This manual is designed to assist in the installation, operation, and maintenance of the Rosemount 848T Temperature Transmitter.

Introduction

OUNDATION

™

fieldbus host or

Section 1: Introduction

November 2014

Section 1: Introduction

 Overview  Considerations  Return of Materials

Section 2: Installation

 Mounting  Installation  Wiring  Power Supply  Commissioning

Section 3: Configuration

 FOUNDATION fieldbus Technology  Configuration  Function Block Configuration

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00809-0100-4697, Rev GA

Section 4: Operation and Maintenance

 Hardware Maintenance  Tro u bl esh o oti ng

Appendix A: Reference Data

 Specifications  Dimensional Drawings  Ordering Information

Appendix B: Product Certificates

 Hazardous Locations Certificates  Intrinsically Safe and Non-Incendive Installations  Installation Drawings

Appendix C: Foundation™ fieldbus Technology

 Device Descriptions  Block Operation

Appendix D: Function Blocks

 Analog Input (AI) Function Block  Multiple Analog Input (MAI) Function Block  Input Selector Function Block

Introduction

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1.3 Service support

To expedite the return process in North America, call the Emerson Process Management National Response Center toll-free at 800-654-7768. This center, available 24 hours a day, will assist 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 the following:

 A Return Material Authorization (RMA) number  Instructions and procedures that are necessary to return goods that were exposed to

hazardous substances

For other locations, contact an Emerson Process Management sales representative.

Section 1: Introduction

November 2014

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.

Introduction

Section 1: Introduction

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Introduction

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Section 2 Installation

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 8

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 11

Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 14

Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 14

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 16

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 ( ). Refer to the following safety messages before performing an operation preceded by this symbol.

Section 2: Installation

November 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.

Process leaks could result in death or serious injury.

 Do not remove the thermowell while in operation. Removing while in operation may

cause process fluid leaks.

 Install and tighten thermowells and sensors before applying pressure, or process

leakage may result.

Electrical shock could cause death or serious injury.

 If the sensor is installed in a high voltage environment and a fault condition or

installation error occurs, high voltage may be present on transmitter leads and terminals.

 Use extreme caution when making contact with the leads and terminals.

2.2 Mounting

The 848T is always mounted remote from the sensor assembly. There are three mounting configurations.

 To a DIN rail without an enclosure  To a panel with an enclosure  To a 2-in pipe stand with an enclosure using a pipe mounting kit

5Installation

Section 2: Installation

November 2014

2.2.1 Mounting to a DIN rail without an enclosure

To mount the 848T to a DIN rail without an enclosure, follow these steps:

1. Pull up the DIN rail mounting clip located on the top back side of the transmitter.

2. Hinge the DIN rail into the slots on the bottom of the transmitter.

3. Tilt the 848T and place onto the DIN rail. Release the mounting clip. The transmitter should be securely fastened to the DIN rail.

Figure 2-1. Mounting the 848T to a DIN Rail

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A. DIN Rail Mounting Clip B. 848T without installed enclosure C. DIN Rail

2.2.2 Mounting to a panel with a junction box

When inside of a plastic or aluminum junction box, the 848T mounts to a panel using four 1/4-20 x 1.25-in. screws.

When inside of a stainless steel junction box, the 848T mounts to a panel using two

/2-in. screws.

Figure 2-2. Mounting the 848T Junction Box to a Panel

Aluminum/plastic Stainless steel

/4-20 x

A. 848T with aluminum or plastic box B. Cover screws (4) C. Mounting screws (4 for aluminum/plastic mounting, 2 for stainless steel mounting) D. Panel E. 848T with a stainless steel box

Installation

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2.2.3 Mounting to a 2-in. pipe stand

Use the optional mounting bracket (option code B6) to mount the 848T to a 2-in. pipe stand when using a junction box.

Figure 2-3. Mounting the 848T to a 2-in. Pipe Stand Using a Junction Box

Section 2: Installation

November 2014

Aluminum/plastic junction box

(styles JA and JP)

Front view Side view Front view Side view

Dimensions are in inches (millimeters). A. 5.1 (130) B. 10.2 (260) C. 6.6 (167) fully assembled D. 4.7 (119) E. 7.5 (190) fully assembled

Aluminum/plastic junction box

mounted on a vertical pipe

Stainless steel junction box

(style JS)

Stainless steel junction box

mounted on a vertical pipe

Installation

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November 2014

2.3 Wiring

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.

Note

Do not apply high voltage (e.g. AC line voltage) to the transmitter terminals. Abnormally high voltage can damage the unit (bus terminals are rated to 42.4 VDC).

Figure 2-4. 848T Transmitter Field Wiring

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A. Integrated Power Conditioner and Filter B. 6234 ft (1900 m) max (depending on cable characteristics) C. Terminators (Trunk) D. Power supply E. F

OUNDATION

F. S pu r G. Signal wiring H. Devices 1-16 (Intrinsically safe installations may allow fewer devices per I.S. barrier)

™

fieldbus host or configuration tool

2.3.1 Connections

The 848T transmitter is compatible with 2 or 3-wire RTD, thermocouple, ohm, and millivolt

sensor types. Figure 2-5 shows the correct input connections to the sensor terminals on the transmitter. The 848T can also accept inputs from analog devices using the optional analog input connector. Figure 2-6 shows the correct input connections to the analog input connector when installed on the transmitter. Tighten the terminal screws to ensure proper connection.

Installation

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12 3

123 123

123

00809-0100-4697, Rev GA

Figure 2-5. Sensor Wiring Diagram

A. 2-wire RTD and ohms B. 3-wire RTD and ohms (Emerson provides 4-wire sensors for all single-element RTDs; use these RTDs in 3-wire

C. Thermocouples/ohms and Millivolts D. 2-wire RTD with compensation loop (transmitter must be configured for a 3-wire RTD in order to recognize an RTD

RTD or ohm inputs

Various RTD configurations, including 2-wire and 3-wire are used in industrial applications. If the transmitter is mounted remotely from a 3-wire RTD, it will operate within specifications, without recalibration, for lead wire resistances of up to 60 ohms per lead (equivalent to 6,000 feet of 20 AWG wire). If using a 2-wire RTD, both RTD leads are in series with the sensor element, so errors can occur if the lead lengths exceed one foot of 20 AWG wire. Compensation for this error is provided when using 3-wire RTDs.

Section 2: Installation

November 2014

configurations by clipping the fourth lead or leaving it disconnected and insulated with electrical tape.)

with a compensation loop)

Thermocouple or millivolt inputs

Use appropriate thermocouple extension wire to connect the thermocouple to the transmitter. Make connections for millivolt inputs using copper wire. Use shielding for long runs of wire.

Analog inputs

The analog connector converts the 4–20 mA signal to a 20–100 mV signal that can be read by the 848T and transmitted using F

Use the following steps when installing the 848T with the analog connector:

1. The 848T, when ordered with option code S002, comes with four analog connectors. Replace the standard connector with the analog connector on the desired channels.

2. Wire one or two analog transmitters to the analog connector according to Figure 2-6. There is space available on the analog connector label for identification of the analog inputs.

Note

Power supply should be rated to support the connected transmitter(s).

3. If the analog transmitters can communicate using HART connectors are supplied with the ability to switch in a 250 ohm resistor for HART communication (see Figure 2-7).

OUNDATION fieldbus.

protocol, the analog

Installation

One switch is supplied for each input (top switch for “A” inputs and bottom switch for “B” inputs). Setting the switch in the “ON” position (to the right) bypasses the 250 ohm resistor. Terminals are provided for each analog input to connect a field communicator for local configuration.

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November 2014

Figure 2-6. 848T Analog Input Wiring Diagram

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A. Analog input connectors B. Analog transmitters C. Power supply

Figure 2-7. 848T Analog Connector

A. HART Channel A B. 250 ohm resistor in the loop when switched to the left C. HART Channel B D. Space available for identification of inputs

Installation

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TE ENABLE

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2.3.2 Power supply

Connections

The transmitter requires between 9 and 32 VDC to operate and provide complete functionality. The DC power supply should provide power with less than 2% ripple. A fieldbus segment requires a power conditioner to isolate the power supply filter and decouple the segment from other segments attached to the same power supply.

All power to the transmitter is supplied over the signal wiring. Signal wiring should be shielded, twisted pair for best results in electrically noisy environments. Do not use unshielded signal wiring in open trays with power wiring or near heavy electrical equipment.

Use ordinary copper wire of sufficient size to ensure the voltage across the transmitter power terminals does not go below 9 VDC. The power terminals are polarity insensitive. To power the transmitter:

1. Connect the power leads to the terminals marked “Bus,” as shown in Figure 2-8.

2. Tighten the terminal screws to ensure adequate contact. No additional power wiring is necessary.

Section 2: Installation

November 2014

Figure 2-8. Transmitter Label

A. Ground (required with T1 option) B. Connect power leads here

2.3.3 Surges/transients

The transmitter will withstand electrical transients encountered through static discharges or induced switching transients. However, a transient protection option (option code T1) is available to protect the 848T against high-energy transients. The device must be properly grounded using the ground terminal (see Figure 2-8).

2.4 Grounding

The 848T transmitter provides input/output isolation up to 620 V rms.

Note

Neither conductor of the fieldbus segment can be grounded. Grounding out one of the signal wires will shut down the entire fieldbus segment.

Installation

Section 2: Installation

November 2014

Shielded wire

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 (most common).

Ungrounded thermocouple, mV, and RTD/ohm inputs

Option 1:

1. Connect signal wiring shield to the sensor wiring shield(s).

2. Ensure shields are tied together and electrically isolated from transmitter enclosure.

3. Only ground shield at the power supply end.

4. Ensure sensor shield(s) is electrically isolated from the surrounding grounded fixtures.

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A. Sensor wires B. 848T C. Power supply D. Shield ground point

Option 2:

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

2. Ensure sensor shield(s) is electrically isolated from surrounding fixtures that may be grounded.

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

A. Sensor wires B. 848T C. Power supply D. Shield ground points

Installation

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Grounded thermocouple inputs

1. Ground sensor wiring shield(s) at the sensor.

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

3. Do not connect the signal wiring shield to the sensor wiring shield(s).

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

A. Sensor wires B. 848T C. Power supply D. Shield ground points

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November 2014

transmitter enclosure.

Analog device inputs

1. Ground analog signal wire at the power supply of the analog devices.

2. Ensure the analog signal wire and the fieldbus signal wire shields are electrically isolated from the transmitter enclosure.

3. Do not connect the analog signal wire shield to the fieldbus signal wire shield.

4. Ground fieldbus signal wire shield at the power supply end.

A. 4-20 mA loop B. F

OUNDATION fieldbus bus

C. Analog device power supply D. Analog device E. 848T F. Power supply G. Shield ground points

Transmitter enclosure (optional)

Ground the transmitter in accordance with local electrical requirements.

Installation

Section 2: Installation

NOT USED SECURITY SIMULATE ENABLE

November 2014

2.5 Switches

Figure 2-9. Switch Location on the Rosemount 848T

Security

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After configuring the transmitter, the data can be protected from unwarranted changes. Each 848T is equipped with a security switch that can be positioned “ON” to prevent the accidental or deliberate change of configuration data. This switch is located on the front side of the electronics module and is labeled SECURITY.

See Figure 2-9 for switch location on the transmitter label.

Simulate enable

The switch labeled SIMULATE ENABLE is used in conjunction with the Analog Input (AI) and Multiple Analog Input (MAI) function blocks. This switch is used to simulate temperature measurement.

Not used

The switch is not functional.

2.6 Tagging

Commissioning tag

The 848T has been supplied with a removable commissioning tag that contains both the Device ID (the unique code that identifies a particular device in the absence of a device tag) and a space to record the device tag [the operational identification for the device as defined by the Piping and Instrumentation Diagram (P&ID)].

When commissioning more than one device on a fieldbus segment, it can be difficult to identify which device is at a particular location. The removable tag, provided with the transmitter, can aid in this process by linking the Device ID to its physical location. The installer should note the physical location of the transmitter on both the upper and lower location of the commissioning tag. The bottom portion should be torn off for each device on the segment and used for commissioning the segment in the control system.

Installation

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Figure 2-10. Commissioning Tag

A. Device ID B. Device Tag to denote physical location

Transmitter tag

Section 2: Installation

November 2014

Hardware

 Tagged in accordance with customer requirements  Permanently attached to the transmitter

Software

 The transmitter can store up to 32 characters.  If no characters are specified, the first 30 characters of the hardware tag will be used.

Sensor tag

Hardware

 A plastic tag is provided to record identification of eight sensors.  This information can be printed at the factory upon request.  In the field, the tag can be removed, printed onto, and reattached to the transmitter.

Software

 If sensor tagging is requested, the Transducer Block SERIAL_NUMBER parameters will

be set at the factory.

 The SERIAL_NUMBER parameters can be updated in the field.

Installation

Section 2: Installation

November 2014

2.7 Installation

2.7.1 Using cable glands

Use the following steps to install the 848T with cable glands:

1. Remove the junction box cover by unscrewing the four cover screws.

2. Run the sensor and power/signal wires through the appropriate cable glands using the pre-installed cable glands (see Figure 2-11).

3. Install the sensor wires into the correct screw terminals (follow the label on the electronics module).

4. Install the power/signal wires onto the correct screw terminals. Power is polarity insensitive, allowing the user to connect positive (+) or negative (–) to either fieldbus wiring terminal labeled “Bus.”

5. Replace the enclosure cover and securely tighten all cover screws.

Figure 2-11. Installing the 848T with Cable Glands

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A. Enclosure cover screw (4) B. Cable gland C. Sensor 1 D. Sensor 3 E. Sensor 5 F. S en sor 7 G. Power/signal H. Sensor 2 I. Sensor 4 J. Sensor 6 K. Sensor 8

Installation

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2.7.2 Using conduit entries

Use the following steps to install the 848T with conduit entries.

1. Remove the junction box cover by unscrewing the four cover screws.

2. Remove the five conduit plugs and install five conduit fittings (supplied by the installer).

3. Run pairs of sensor wires through each conduit fitting.

4. Install the sensor wires into the correct screw terminals (follow the label on the electronics module).

5. Install the power/signal wires into the correct screw terminals. Power is polarity insensitive, allowing the user to connect positive (+) or negative (–) to either fieldbus wiring terminal labeled “Bus.”

6. Replace the junction box cover and securely tighten all cover screws.

Figure 2-12. Installing the 848T with Conduit Entries

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November 2014

Installation

A. Enclosure cover screw B. Sensors 1 and 2 conduit C. Sensors 3 and 4 conduit D. Sensors 5 and 6 conduit E. Sensors 7 and 8 conduit F. P ower/s ig nal

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November 2014

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Installation

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Section 3 Configuration

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 19

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 20

Common configurations for high density applications . . . . . . . . . . . . . . . . . . . . . . . . . . . page 22

Block configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 25

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 ( ). Refer to the following safety messages before performing an operation preceded by this symbol.

3.1.1 Warnings

Section 3: Configuration

November 2014

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

 Make sure only qualified personnel perform the installation.

Process leaks could result in death or serious injury.

 Do not remove the thermowell while in operation. Removing while in operation may

cause process fluid leaks.

 Install and tighten thermowells and sensors before applying pressure, or process

leakage may result.

Electrical shock could cause death or serious injury.

 If the sensor is installed in a high voltage environment and a fault condition or

installation error occurs, high voltage may be present on transmitter leads and terminals.

 Use extreme caution when making contact with the leads and terminals.

19Configuration

Section 3: Configuration

November 2014

3.2 Configuration

3.2.1 Standard

Each FOUNDATION™ fieldbus configuration tool or host system has a different way of displaying and performing configurations. Some will use Device Descriptions (DDs) and DD Methods to make configuration and displaying of data consistent across host platforms.

Unless otherwise specified, the 848T will be shipped with the following configuration (default):

Table 3-1. Standard Configuration Settings

Sensor Type

Damping

Measurement Units

Output

Line Voltage Filter

(1)

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Type J Thermocouple

5 seconds

°C

Linear with Temperature

60 Hz

Temperature Specific Blocks

FOUNDATION fieldbus Function Blocks

(1) For all eight sensors

Refer to that systems documentation to perform configuration changes using a F fieldbus host or configuration tool.

Note

To make configuration changes, ensure that the block is Out of Service (OOS) by setting the MODE_BLK.TARGET to OOS, or set the SENSOR_MODE to Configuration.

3.2.2 Transmitter configuration

The transmitter is available with the standard configuration setting. The configuration settings and block configuration may be changed in the field with the Emerson Process Management

Systems DeltaV

™

, with AMS®inside, or other FOUNDATION fieldbus host or configuration tool.

3.2.3 Custom configuration

Custom configurations are to be specified when ordering.

3.2.4 Methods

For FOUNDATION fieldbus hosts or configuration tools that support device description (DD) methods, there are two configuration methods available in the transducer block. These methods are included with the DD software.

• Transducer Block (1)

• Analog Input (8)

•Multiple Analog Input (2)

• Input Selector (4)

OUNDATION

 Sensor Configuration  Sensor Input Trim (user input trim)

See the host system documentation for information on running DD methods from the host system. If the F

OUNDATION fieldbus host or configuration tool does not support DD methods,

refer to “Block configuration” on page 25 for information on how to modify sensor configuration parameters.

Configuration

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3.2.5 Alarms

Use the following steps to configure the alarms, which are located in the Resource Function Block:

1. Set the resource block to OOS.

2. Set WRITE_PRI to the appropriate alarm level (WRITE_PRI has a selectable range of

priorities from 0 to 15, see “Alarm Priority Levels” on page 31. Set the other block alarm parameters at this time.

3. Set CONFIRM_TIME to the time, in

confirmation of receiving a report before trying again (the device does not retry if CONFIRM_TIME is 0).

4. Set LIM_NOTIFY to a value between zero and MAX_NOTIFY. LIM_NOTIFY is the

maximum number of alert reports allowed before the operator needs to acknowledge an alarm condition.

5. Enable the reports bit in FEATURES_SEL. (When Multi-bit alerts is enabled, every active

alarm is visible for any of the eight sensors, generated by a PlantWeb Diagnostics alert. This is different than only viewing the highest priority alarm.)

6. Set the resource block to AUTO.

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November 2014

/32 of a millisecond, that the device will wait for

and Field

For modifying alarms on individual function blocks (AI or ISEL blocks), refer to Appendix D:

Function Blocks.

3.2.6 Damping

Use the following steps to configure the damping, which is located in the transducer function block:

1. Set Sensor Mode to Out of Service.

2. Change DAMPING to the desired filter rate (0.0 to 32.0 seconds).

3. Set Sensor Mode to In Service.

3.2.7 Configure the differential sensors

Use the following steps to configure the differential sensors:

1. Set Dual Sensor Mode to Out of Service.

2. Set Input A and Input B to the sensor values that are to be used in the differential

equation diff = A–B. (Note: Unit types must be the same.)

3. Set the DUAL_SENSOR_CALC to either Not Used, Absolute, or INPUT A minus INPUT B.

4. Set Dual Sensor Mode to In Service.

Configuration

Section 3: Configuration

November 2014

3.2.8 Configure measurement validation

Use the following steps to configure measurement validation:

1. Set mode to Disabled for specific sensor.

2. Select sample rate. 1-10 sec/sample is available. 1 second/sample is preferred for sensor degradation. The higher the number of seconds between samples, the more emphasis put on process variation.

3. Select Deviation Limit from 0 to 10 units. If deviation limit is exceeded, a status event will be triggered.

4. Select Increasing Limit. Sets the limit for increasing rate of change. If limit is exceeded, a status event will be triggered.

5. Select Decreasing Limit. Sets the limit for decreasing rate of change. If li mit is exceeded, a status event will be triggered.

Note

The decreasing limit selected is required to be a negative value.

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6. Set the Deadband from 0 to 90%. This threshold is used to clear the PV status.

7. Set Status Priority. This determines what happens when the specific limit has been exceeded. No Alert - Ignores limit settings. Advisory - Sets Advisory Plant Web Alert, but does not do anything with PV status. Warning - Sets a Maintenance Plant Web Alert and sets PV status to uncertain. Failure - Sets A Failure Plant Web Alert and sets PV status to Bad.

8. Set mode to Enabled for specific sensor.

3.3 Common configurations for high density applications

For the application to work properly, configure the links between the function blocks and schedule the order of their execution. The Graphical User Interface (GUI) provided by the F

OUNDATION fieldbus host or configuration tool will allow easy configuration.

The measurement strategies shown in this section represent some of the common types of configurations available in the 848T. Although the appearance of the GUI screens will vary from host to host, the configuration logic is the same.

Note

Ensure the host system or configuration tool is properly configured before downloading the transmitter configuration. If configured improperly, the F configuration tool could overwrite the default transmitter configuration.

OUNDATION fieldbus host or

Configuration

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