Emerson Rosemount 8742C, 8700 Series Reference Manual

Reference Manual

00809-0100-4793, Rev CA August 2004

Rosemount 8742C Magnetic Flowmeter Transmitter with F

OUNDATION

™

Fieldbus and

8700 Series Magnetic Flowmeter Flowtube

www.rosemount.com

Reference Manual

00809-0100-4793, Rev CA August 2004

Rosemount 8742C

Rosemount 8742C Magnetic Flowmeter Transmitter with F

OUNDATION

™

Fieldbus and 8700

Series Magnetic Flowmeter Flowtube

NOTICE

Read this manual before working with the product. For personal and system safety, and for optimum product performance, make sure you thoroughly understand the contents before installing, using, or maintaining this product.

Within the United States, Rosemount Inc. has two toll-free assistance numbers:

Customer Central

Technical support, quoting, and order-related questions.

1-800-999-9307 (7:00 am to 7:00 pm CST)

North American Response Center

Equipment service needs.

1-800-654-7768 (24 hours—includes Canada)

Outside of the United States, contact your local Rosemount representative.

www.rosemount.com

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 your local Rosemount Sales Representative.

Rosemount, the Rosemount logotype, Fisher-Rosemount, Managing the Process Better, PlantWeb, and SMART FAMILY are registered trademarks of Rosemount Inc. DeltaV is a trademark of the Fisher-Rosemount group of companies. HART is a registered trademark of the HART Communication Foundation. Tefzel and Teflon are registered trademarks of E.I. du Pont de Nemours & Co. Ryton is a registered trademark of the Phillips Petroleum Co. Fluoraz is a registered trademark of Greens, Tweed & Co., Inc. Hastelloy C and Hastelloy C-22 are registered trademarks of Haynes International,

OUNDATION is a trademark of the Fieldbus Foundation.

Cover photo: 8742h0002

Reference Manual

00809-0100-4793, Rev CA August 2004

Rosemount 8742C

Table of Contents

SECTION 1 Introduction

SECTION 2 Installation

System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Return of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Transmitter Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Pre-Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Identify Options and Configurations . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Hardware Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Simulate Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Transmitter Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Changing Hardware

Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Rotate Transmitter Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Conduit Ports and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Conduit Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Conduit Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Transmitter Coil Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Installation Category. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Overcurrent Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Transmitter Communication Input . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Power Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Field Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Transmitter Wiring Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Transmitter to

Flowtube Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Flowtube to Remote Mount Transmitter Connections . . . . . . . . . . 2-9

Flowtube to Integral Mount Transmitter Connections. . . . . . . . . . 2-10

www.rosemount.com

Rosemount 8742C

Reference Manual

00809-0100-40793, Rev CA

August 2004

SECTION 3 Flowtube Installation

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Flowtube Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Flowtube Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Upstream/Downstream

Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Flowtube Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Flow Direction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Installation (Flanged Flowtube) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Flange Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Installation

(Wafer Flowtube) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Flange Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

Installation

(Sanitary Flowtube) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Alignment and Bolting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Process Leak Protection (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Standard Housing Configuration . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

Relief Valves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

Process Leak Containment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

SECTION 4 Configuration

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Quick Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Flowtube Calibration Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Assigning Device Tag and Node Address . . . . . . . . . . . . . . . . . . . . . . 4-2

AI Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Arithmetic Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Integrator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

PID Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Configuring Links and Scheduling Block Execution. . . . . . . . . . . . . . . 4-5

Advanced Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Cascade Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Resource Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

FEATURES and FEATURES_SEL . . . . . . . . . . . . . . . . . . . . . . . . 4-8

MAX_NOTIFY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

PlantWeb

™

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

TOC-2

Reference Manual

00809-0100-4793, Rev CA August 2004

Rosemount 8742C

SECTION 5 Operation and Maintenance

SECTION 6 Troubleshooting

APPENDIX A Reference Data

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Software Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Local Display Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Electronics Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Auto Zero Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Configuring the Advanced Diagnostics and Empty Pipe . . . . . . . . 5-4

Learning Empty Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

Diagnostic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

Diagnostic Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9

Hardware Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9

Replacing the F

Step 1: Function Block Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Step 2: Diagnostic Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Step 3: Wiring Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Step 4: Process Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Step 5: Installed Flowtube Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Step 6: Uninstalled Flowtube Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

Rosemount 8742C Transmitter Specifications . . . . . . . . . . . . . . . . . .A-1

Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Foundation Fieldbus Specifications . . . . . . . . . . . . . . . . . . . . . . . . A-3

Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

Rosemount 8705 and 8707 Flowtubes Specifications. . . . . . . . . . . . . A-5

Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8

Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8

Rosemount 8711 Wafer Flowtube Specifications . . . . . . . . . . . . . . . A-11

Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-11

Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12

Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12

Rosemount 8714D Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . A-14

Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-14

Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-14

Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-14

Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-15

Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-22

Rosemount 8742C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-22

Rosemount 8705 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-24

Rosemount 8707 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-28

Rosemount 8711 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-30

Rosemount 8714 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-31

OUNDATION

™

Fieldbus Electronics Housing. . . . . . 5-9

™

Fieldbus Terminal Block in the Housing5-10

™

Fieldbus Electronics Boards. . . . . . 5-10

TOC-3

Rosemount 8742C

Reference Manual

00809-0100-40793, Rev CA

August 2004

APPENDIX B Product Certifications

APPENDIX C Resource Block

APPENDIX D Transducer Block

Approved Manufacturing Locations . . . . . . . . . . . . . . . . . . . . . . . . B-1

European Directive Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

ATEX Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

European Pressure Equipment Directive (PED) (97/23/EC) . . . . . B-1

Electro Magnetic Compatibility (EMC) (89/336/EEC) . . . . . . . . . . .B-2

Low Voltage Directive (93/68/EEC) . . . . . . . . . . . . . . . . . . . . . . . .B-2

Other important guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2

Hazardous Location Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Transmitter Approval Information . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Flowtube Approval Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-1

Parameters and Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-1

Resource Block Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-5

Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5

Alarm Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-6

Status Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-6

VCR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-6

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-6

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-1

Parameters and Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-2

Flow-Specific Block Configuration Values . . . . . . . . . . . . . . . . . . . . . .D-3

Transducer Block Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-4

Transducer Block Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-5

Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-5

Alarm Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-5

Status Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-6

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-6

APPENDIX E Field-Removable Electrodes

TOC-4

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

Remove the Electrode Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

Replace the Electrode Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2

Reference Manual

00809-0100-4793, Rev CA August 2004

Section 1 Introduction

System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-1

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-3

Return of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-3

Rosemount 8742C

SYSTEM DESCRIPTION The Rosemount

separate flowtube and transmitter units, and measures volumetric flow rate by detecting the velocity of a conductive liquid that passes through a magnetic field. Magnetic Flowmeter Systems consist of a flowtube and a transmitter. There are three Rosemount magnetic flowmeter flowtubes:

• Flanged Rosemount 8705

• Flanged High-Signal Rosemount 8707

• Wafer-Style Rosemount 8711

• Sanitary 8721

There are three Rosemount magnetic flowmeter transmitters:

• Rosemount 8712D/H

• Rosemount 8732C

• Rosemount 8742C

The flowtube is installed in-line with process piping — either vertically or horizontally. Coils located on opposite sides of the flowtube create a magnetic field. A conductive liquid moving through the magnetic field generates a voltage at the two electrodes that is proportional to the flow velocity.

The transmitter drives the coils to generate a magnetic field and electronically conditions the voltage detected by the electrodes. The transmitter then amplifies and conditions the electrode signal to provide a flow signal. The transmitter can be integrally mounted or remotely mounted from the flowtube.

8700 Series Magnetic Flowmeter System combines

www.rosemount.com

This manual is designed to assist in the installation and operation of Rosemount 8742C Magnetic Flowmeter Transmitter with F fieldbus and 8700 Series Magnetic Flowmeter Flowtubes.

Attempting to install and operate the Rosemount 8705, 8707 High-Signal, or 8711 Magnetic Flowmeter Flowtubes with the Rosemount 8712D/H, 8732, or 8742 Magnetic Flowmeter Transmitter without reviewing the instructions contained in this manual could result in personal injury or equipment damage.

OUNDATION

™

Rosemount 8742C

00809-0100-4793, Rev CA

Section 2: Installation

• Transmitter Commissioning

• Wiring Flowmeter to a Flowtube

Section 3: Flowtube Installation

• Handling

• Mounting

• Installation of a Flanged, Wafer, and Sanitary Flowtube

Section 4: Configuration

• Assigning Device Tag

• Configuring Blocks

• Configuring Links and Scheduling Block Execution

Section 5: Operation and Maintenance

• Software Operation

• Hardware Maintenance

• Replacing the F

OUNDATION

™

fieldbus Electronics Housing

Reference Manual

August 2004

Section 6: Troubleshooting

• Troubleshooting Procedures

• Electrical Circuit Diagrams

Appendix A: Reference Data

• Specifications for Rosemount 8742 Transmitter and 8700 Series Flowtubes

• Ordering Tables

• Dimensional Drawings

Appendix B: Product Certifications

• Transmitter Approval Information

• Flowtube Approval Information

Appendix C: Resource Block

• Parameters and Descriptions

• Modes

Appendix D: Transducer Block

• Parameters and Descriptions

• Modes

Appendix E: Field-Removable Electrodes

• Electrode Assembly

1-2

Reference Manual

00809-0100-4793, Rev CA August 2004

Rosemount 8742C

SAFETY MESSAGES Procedures and instructions in this manual may require special precautions to

ensure the safety of the personnel performing the operations. Refer to the safety messages listed at the beginning of each section before performing any operations.

RETURN OF MATERIALS To expedite the return process outside the United States, contact the nearest

Rosemount representative.

Within the United States and Canada, call the North American Response Center using the 800-654-RSMT (7768) toll-free number. The Response Center, available 24 hours a day, will assist you with any needed information or materials.

The center will ask for product model and serial numbers, and will provide a Return Material Authorization (RMA) number. The center will also ask for the name of the process material to which the product was last exposed.

Mishandling products exposed to a hazardous substance may result in death or serious injury. If the product being returned was exposed to a hazardous substance as defined by OSHA, a copy of the required Material Safety Data Sheet (MSDS) for each hazardous substance identified must be included with the returned goods.

The North American Response Center will detail the additional information and procedures necessary to return goods exposed to hazardous substances.

See “Safety Information” on page 4-1 for complete warning information.

1-3

Reference Manual

00809-0100-4793, Rev CA August 2004

Rosemount 8742C

1-4

Reference Manual

00809-0100-4793, Rev CA August 2004

Section 2 Installation

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1

Transmitter Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-2

Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-2

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-4

This section covers the steps required to physically install the magnetic flowmeter. Instructions and procedures in this section may require special precautions to ensure the safety of the personnel performing the operations. Please refer to the following safety messages before performing any operation in this section.

Rosemount 8742C

SAFETY INFORMATION

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

Installation and servicing instructions are for use by qualified personnel only. Do not perform any servicing other than that contained in the operating instructions, unless qualified. Verify that the operating environment of the flowtube and transmitter is consistent with the appropriate FM or CSA approval.

Do not connect a Rosemount 8742C to a non-Rosemount flowtube that is located in an explosive atmosphere.

The flowtube liner is vulnerable to handling damage. Never place anything through the flowtube for the purpose of lifting or gaining leverage. Liner damage can render the flowtube useless.

To avoid possible damage to the flowtube liner ends, do not use metallic or spiral-wound gaskets. If frequent removal is anticipated, take precautions to protect the liner ends. Short spool pieces attached to the flowtube ends are often used for protection.

Correct flange bolt tightening is crucial for proper flowtube operation and life. All bolts must be tightened in the proper sequence to the specified torque limits. Failure to observe these instructions could result in severe damage to the flowtube lining and possible flowtube replacement.

www.rosemount.com

Rosemount 8742C

Reference Manual

00809-0100-4793, Rev CA

August 2004

TRANSMITTER SYMBOLS

Caution Symbol — Check product documentation for details.

Protective conductor (grounding) terminal.

PRE-INSTALLATION Before installing the Rosemount 8742C Magnetic Flowmeter Transmitter,

there are several pre-installation steps that should be completed to make the installation process easier. They include identifying the options and configurations that apply to your application, setting the hardware switches if necessary, and consideration of physical requirements.

The mounting site for the 8742C should provide enough room for secure mounting, easy access to the conduit ports, and full opening of the transmitter covers.

To ensure maximum transmitter life, avoid excessive heat and vibration. Typical problem areas include high-vibration lines with integrally mounted transmitters, warm-climate installations in direct sunlight, and outdoor installations in cold climates. To avoid potential problems, remotely mounted transmitters may be installed in the control room. This protects the electronics from the harsh environment and provides easy access for configuration or service.

The Rosemount 8742C transmitter requires external power regardless of whether it is mounted remotely or integrally to the flowtube. Access to a suitable power source must be ensured.

Identify Options and Configurations

The standard application of the Rosemount 8742C includes a FOUNDATION fieldbus output. Be sure to identify options and configurations that apply to your situation, and keep a list of them nearby for consideration during the installation and configuration procedures.

Hardware Switches The Rosemount 8742C electronics board is equipped with two

user-selectable hardware switches. These switches set Simulate Enable and Transmitter Security. The standard configurations for these switches when shipped from the factory are as follows:

Simulate Enable: Off

Transmitter Security: Off

Definitions of these switches and their functions are provided below. The switches are located on the outerboard of the electronics transmitter stack. See Figure 2-1 on page 2-3.

Simulate Enable The simulate enable switch is used in conjunction with the Analog Input (AI)

function block. The switch is used to enable flow measurement simulation. The switch is also used as a lock-out feature for the AI function block. To enable the simulate enable feature, the switch must transition form OFF to ON after power is applied to the transmitter, preventing the transmitter from being accidentally left in simulate mode.

Transmitter Security After you configure the transmitter, you may want to protect the configuration

data from unwarranted changes. Each transmitter is equipped with a security switch that can be positioned ON to prevent the accidental or deliberate change of configuration data.

2-2

Reference Manual

00809-0100-4793, Rev CA August 2004

Figure 2-1. Hardware Switches

Rosemount 8742C

Instructions for changing the hardware switches are provided in “Changing Hardware Switch Settings” on page 2-3.

Simulate Enable

Transmitter Security

8742-1002H01A

Changing Hardware Switch Settings

Rotate Transmitter Housing

In most cases, it is not necessary to change the setting of the hardware switches. If you need to change the switch settings, complete the steps outlined below:

NOTE

The hardware switches are located on the electronics board and changing their settings requires opening of the electronics housing. If possible, carry out these procedures away from the plant environment in order to protect the electronics.

1. Disconnect power to the transmitter.

2. Unscrew and remove the electronics cover.

3. Identify the location of the switch.

4. Change the setting of the desired switches with a small screwdriver.

Refer to Figure 2-1.

5. Screw and tighten the electronics cover.

The electronics housing can be rotated on the flowtube in 90° increments by loosening the four mounting bolts on the bottom of the housing, rotating the housing, and reinstalling the bolts. Refer to Figure 2-2 on page 2-4. When the housing is returned to its original position, be sure the surface is clean and there is no gap between the housing and the flowtube.

See “Safety Information” on page 2-1 for complete warning information.

2-3

Rosemount 8742C

Figure 2-2. Rosemount 8742C Transmitter Dimensional Drawing

5.10

(130)

10.5

(267)

3.00 (76)

1.94 (49)

7.49 (190)

6.48 (165)

LOI Cover

8.81

(224)

3.07 (78)

Reference Manual

00809-0100-4793, Rev CA

August 2004

/4”-14 NPT Electrical

Conduit Connections

(2 places)

3.43 (87)

/4”-14 NPT

Flowtube Conduit

Connections

(2 places)

11.02 (280)

WIRING Correct cable preparation is important for a successful installation. The

conduit connections needed for installation depend on transmitter location. A conduit run between the flowtube and transmitter is not required if the transmitter is integrally mounted on the flowtube.

Conduit Ports and Connections

Both the flowtube and transmitter junction boxes have ports for ¾-inch NPT conduit connections. These connections should be made in accordance with local or plant electrical codes. Unused ports should be sealed with metal plugs. Housing damage will result if metal plugs are overtightened.

Proper electrical installation is necessary to prevent errors due to electrical noise and interference. Before making any electrical connections to the Rosemount 8742C, consider the following standards and be sure to have proper power supply, conduit, and other accessories. Shielded cable must be used for best results in electrically noisy environments.

Conduit Connections The transmitter has ports for ¾–inch NPT conduit connections. If the port is

not being used, conduit seals should to be installed. In some cases, conduits may also require drainage if moisture could build up in the line.

2-4

Reference Manual

00809-0100-4793, Rev CA August 2004

Rosemount 8742C

Conduit Cables Run the appropriate size cable through the conduit connections in your

magnetic flowmeter system. Run the power cable from the power source to the transmitter. Run the coil drive and electrode cables between the flowmeter and transmitter.

Prepare the ends of the coil drive and electrode cables as shown in Figure 2-3. Limit the unshielded wire length to 1-inch on both the electrode and coil drive cables.

NOTE

Excessive lead length or failure to connect cable shields can create electrical noise resulting in unstable meter readings.

Figure 2-3. Cable Preparation Detail

1.00 (26)

NOTE Dimensions are in

Cable Shield

inches (millimeters).

8705-0041B

Transmitter Coil Input The Rosemount 8742C Magnetic Flowmeter Transmitter is a four-wire device.

This wiring section covers supplying power to the flowtube coils through the transmitter. The transmitter coil input power sends a pulsed DC frequency to the flowtube.

Wire the transmitter according to local electrical requirements. Ground the transmitter cage via the threaded conduit connection. For ac power applications, connect ac Neutral to terminal N and connect ac Line to terminal L1. For dc power applications, properly connect the positive and negative terminals. Units powered by 15-50 V dc power supply may draw up to 1 amp of current. In addition, follow the supply wire and disconnect requirements below:

1.0

0.75

0.5

0.25

Supply Current (Amps)

I = 10/V I = Supply current requirement (Amps) V = Power supply voltage (Volts)

Power Supply (Volts)

2-5

Reference Manual

00809-0100-4793, Rev CA

Rosemount 8742C

August 2004

Supply Wire Requirements

Use 12 to 18 AWG wire rated for the proper temperature application. For connections in ambient temperatures above 140 °F (60 °C), use a wire rated for 176 °F (80 °C). For ambients greater than 176 °F (80 °C), use a wire rated for 230 °F (110 °C).

Disconnects

Connect the device through an external disconnect or circuit breaker. Clearly label the disconnect or circuit breaker and locate it near the transmitter and per local electrical control.

Installation Category The installation category for the Rosemount 8742C is

(Overvoltage) Category II.

Overcurrent Protection The Rosemount 8742C Flowmeter Transmitter requires overcurrent

protection of the supply lines. Maximum ratings of overcurrent devices are as follows:

Power System Fuse Rating Manufacturer

110 V ac 250 V; 1 Amp, Quick Acting Bussman AGCI or Equivalent

220 V ac 250 V; 0.5 Amp, Quick Acting Bussman AGCI or Equivalent

Transmitter Communication Input

The FOUNDATION fieldbus communication requires a minimum of 9 V dc and a maximum of 32 V dc at the transmitter communication terminals.

NOTES

• Do not exceed 32 V dc at the transmitter communication terminals.

• Do not apply ac line voltage to the transmitter communication terminals.

Improper supply voltage can damage the transmitter.

Power Conditioning Each fieldbus power supply requires a power conditioner to decouple the

power supply output from the fieldbus wiring segment.

Field Wiring Power independent of the coil power supply must be supplied for FOUNDATION

fieldbus communications. Use shielded, twisted pair for best results. For new installations or to get maximum performance, twisted pair cable designed especially for fieldbus should be used. Table 2-1 details cable characteristics and ideal specifications.

Table 2-1. Ideal Cable Specifications for Fieldbus Wiring

Characteristic Ideal Specification

Impedance 100 Ohms ± 20% at 31.25 kHz

Wire Size 18 AWG (0,8 mm2)

Shield Coverage 90%

Attenuation 3 db/km

Capacitive Unbalance 2 nF/km

2-6

See “Safety Messages” on page 2-1 for complete warning information.

Reference Manual

00809-0100-4793, Rev CA August 2004

Rosemount 8742C

NOTE

The number of devices on a fieldbus segment is limited by the power supply voltage, the resistance of the cable, and the amount of current drawn by each device.

Transmitter Wiring Connection

Figure 2-4. Rosemount 8742C Transmitter Field Wiring

To make the transmitter communication wiring connection, remove the end cover on the electronics housing. Connect the power leads to the positive (+) and negative (–) fieldbus communication terminals. The communication terminals are polarity insensitive: the polarity of the dc power leads does not matter when connecting to the power terminals.

When wiring to screw terminals, crimped lugs are recommended. Tighten the terminals to ensure adequate contact.

Both transmitter covers must be fully engaged to meet explosion proof requirements. Do not remove the transmitter covers in an explosive atmosphere when the transmitter is powered

6234 ft (1900 m) max

(depending upon cable

Integrated

Power

Conditioner

and Filter

Segment

Power

Supply

(Trunk)

(1)

Terminators

Fieldbus

(The power supply, filter, first terminator, and configuration tool are typically located in the control room.)

*Intrinsically safe installations may allow fewer devices per I.S. barrier.

(1) Pending final approval.

OUNDATION

Fieldbus

Configuration

Too l

(Spur)

Devices 1 through 11*

(Spur)

8742-8742_01A

2-7

Rosemount 8742C

Figure 2-5. Power Connections

Input Power 90–250 V ac

Reference Manual

00809-0100-4793, Rev CA

August 2004

Grounding Lugs

Fieldbus Outputs

8742-1002F01A

Transmitter to Flowtube Wiring

Figure 2-6. Conduit Preparation

Wrong Correct

Power

Outputs

Power

Outputs

Flanged and wafer flowtubes have two conduit ports as shown in Figures 3-13, 3-14, 3-15, and 3-16. Either one may be used for both the coil drive and electrode cables. Use the stainless steel plug that is provided to seal the unused conduit port.

A single dedicated conduit run for the coil drive and electrode cables is needed between a flowtube and a remote transmitter. Bundled cables in a single conduit are likely to create interference and noise problems in your system. Use one set of cables per conduit run. See Figure 2-6 for proper conduit installation diagram and Table 2-2 for recommended cable. For integral and remote wiring diagrams refer to Figure 2-7 and Figure 2-8.

Coil Drive

and

Electrode

Cables

Power

Outputs

Power

Outputs

Coil Drive and

Electrode

Cables

2-8

Reference Manual

00809-0100-4793, Rev CA August 2004

Table 2-2. Cable Requirements

Rosemount 8742C

Description Part Number

Signal Cable (20 AWG) Belden 8762, Alpha 2411 equivalent 08712-0061-0001

Coil Drive Cable (14 AWG) Belden 8720, Alpha 2442 equivalent 08712-0060-0001

Combination Signal and Coil Drive Cable (18 AWG)

Belden 9368 equivalent

(1) Combination signal and coil drive cable is not recommended for

high-signal magmeter system. For remote mount installations, combination signal and coil drive cable should be limited to less than 100 ft. (30 m).

(1)

Remote transmitter installations require equal lengths of signal and coil drive cables. Integrally mounted transmitters are factory wired and do not require interconnecting cables.

Lengths from 5 to 1,000 feet (1.5 to 300 meters) may be specified, and will be shipped with the flowtube.

08712-0750-0001

Flowtube to Remote Mount Transmitter Connections

Figure 2-7. Wiring Diagram

Connect coil drive and electrode cables as shown in Figure 2-7.

Do not connect ac power to the flowtube or to terminals 1 and 2 of the transmitter, or replacement of the electronics board will be necessary.

8742b_07a

2-9

Rosemount 8742C

Table 2-3. Flowtube to Remote Mount Transmitter

Reference Manual

00809-0100-4793, Rev CA

August 2004

Rosemount 8712D/H Transmitters Rosemount 8705/8707/8711 Flowtubes

11 2 2

17 17 18 18 19 19

Flowtube to Integral Mount Transmitter Connections

Figure 2-8. Wiring Diagram to Rosemount 8732C/8742C Transmitter

Connect coil drive and electrode cables as shown in Figure 2-8.

Do not connect ac power to the flowtube or to terminals 1 and 2 of the transmitter, or replacement of the electronics board will be necessary.

Electronics Board

Table 2-4. Flowtube to Integral Mount Transmitter

2-10

8732-8732B01A

Rosemount 8732C/8742C Rosemount 8705/8711 Flowtubes

2 2

17 17

18 18

19 19

Reference Manual

00809-0100-4793, Rev CA August 2004

Rosemount 8742C

Section 3 Flowtube Installation

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-1

Flowtube Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-3

Flowtube Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-4

Installation (Flanged Flowtube) . . . . . . . . . . . . . . . . . . . . . page 3-7

Installation (Wafer Flowtube) . . . . . . . . . . . . . . . . . . . . . . . page 3-10

Installation (Sanitary Flowtube) . . . . . . . . . . . . . . . . . . . . . page 3-12

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-12

Process Leak Protection (Optional) . . . . . . . . . . . . . . . . . page 3-15

This section covers the steps required to physically install the magnetic flowtube. For electrical connections and cabling see Section 2: Installation. Instructions and procedures in this section may require special precautions to ensure the safety of the personnel performing the operations. Please refer to the following safety messages before performing any operation in this section.

SAFETY MESSAGES This symbol is used throughout this manual to indicate that special attention

to warning information is required.

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

Do not connect a Rosemount 8742C to a non-Rosemount flowtube that is located in an explosive atmosphere.

www.rosemount.com

Rosemount 8742C

Reference Manual

00809-0100-4793, Rev CA

August 2004

Explosions could result in death or serious injury:

Installation of this transmitter in an explosive environment must be in accordance with the appropriate local, national, and international standards, codes, and practices. Please review the approvals section of the 8742C reference manual for any restrictions associated with a safe installation.

Before connecting a HART-based 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.

Electrical shock can result in death or serious injury

Avoid contact with the leads and terminals. High voltage that may be present on leads can cause electrical shock.

The flowtube liner is vulnerable to handling damage. Never place anything through the flowtube for the purpose of lifting or gaining leverage. Liner damage can render the flowtube useless.

3-2

Reference Manual

00809-0100-4793, Rev CA August 2004

Rosemount 8742C

FLOWTUBE HANDLING Handle all parts carefully to prevent damage. Whenever possible, transport

the system to the installation site in the original shipping containers.

Te fl on mechanical damage and normal unrestrained distortion. Remove the end covers just before installation.

Flanged 6- through 36-inch flowtubes come with a lifting lug on each flange. The lifting lugs make the flowtube easier to handle when it is transported and lowered into place at the installation site.

Flanged ½- to 4-inch flowtubes do not have lugs. They must be supported with a lifting sling on each side of the housing.

Figure 3-1 shows flowtubes correctly supported for handling and installation. Notice the plywood end pieces are still in place to protect the flowtube liner during transportation.

Figure 3-1. Rosemount 8705 Flowtube Support for Handling

-lined flowtubes are shipped with end covers that protect it from both

½- through 4-Inch

Flowtubes

See ”Safety Messages” on pages 3-1 and 3-2 for complete warning information.

8732-0281B02AB, C02AB

6-Inch and Larger

Flowtubes

3-3

Reference Manual

00809-0100-4793, Rev CA

Rosemount 8742C

August 2004

FLOWTUBE MOUNTING Physical mounting of a flowtube is similar to installing a typical section of pipe.

Conventional tools, equipment, and accessories (bolts, gaskets, and grounding hardware) are required.

Upstream/Downstream Piping

To ensure specification accuracy over widely varying process conditions, install the flowtube a minimum of five straight pipe diameters upstream and two pipe diameters downstream from the electrode plane (see Figure 3-2).

Figure 3-2. Upstream and Downstream Straight Pipe Diameters

5 Pipe Diameters

FLOW

2 Pipe Diameters

Flowtube Orientation The flowtube should be installed in a position that ensures the flowtube

remains full during operation. Figures 3-3, 3-4, and 3-5 show the proper flowtube orientation for the most common installations. The following orientations ensure that the electrodes are in the optimum plane to minimize the effects of entrapped gas.

Vertical installation allows upward process fluid flow and is generally preferred. Upward flow keeps the cross-sectional area full, regardless of flow rate. Orientation of the electrode plane is unimportant in vertical installations. As illustrated in Figures 3-3 and 3-4, avoid downward flows where back pressure does not ensure that the flowtube remains full at all times.

8732-0281G02A

Figure 3-3. Vertical Flowtube Orientation

3-4

FLOW

8735-0005A01AB, 0005A01BB

Reference Manual

00809-0100-4793, Rev CA August 2004

Figure 3-4. Incline or Decline Orientation

Rosemount 8742C

FLOW

Figure 3-5. Horizontal Flowtube Orientation

FLOW

Horizontal installation should be restricted to low piping sections that are normally full. Orient the electrode plane to within 45 degrees of horizontal in horizontal installations. A deviation of more than 45 degrees of horizontal would place an electrode at or near the top of the flowtube thereby making it more susceptible to insulation by air or entrapped gas at the top of the flowtube.

FLOW

The electrodes in the Rosemount 8711 are properly oriented when the top of the flowtube is either vertical or horizontal, as shown in Figure 3-6. Avoid any mounting orientation that positions the top of the flowtube at 45° from the vertical or horizontal position.

8732-0005A01EB, 0005A01FB

8732-0005A01C

3-5

Rosemount 8742C

Figure 3-6. Rosemount 8711 Mounting Position

Reference Manual

00809-0100-4793, Rev CA

August 2004

45° Electrode Plane

Flow Direction The flowtube should be mounted so that the FORWARD end of the flow

arrow, shown on the flowtube identification tag, points in the direction of flow through the tube (see Figure 3-7).

Figure 3-7. Flow Direction

FLOW

8711-8711-E01AB, 8711-8711-F01A

8712-0281H02FD

3-6

Reference Manual

00809-0100-4793, Rev CA August 2004

Rosemount 8742C

INSTALLATION (FLANGED FLOWTUBE)

The following section should be used as a guide in the installation of the flange-type Rosemount 8705 and Rosemount 8707 High-Signal Flowtubes. Refer to page 3-10 for installation of the wafer-type Rosemount 8711 Flowtube.

Gaskets The flowtube requires a gasket at each of its connections to adjacent devices or

piping. The gasket material selected must be compatible with the process fluid and operating conditions. Metallic or spiral-wound gaskets can damage the liner. If the gaskets will be removed frequently, protect the liner ends. All other applications (including flowtubes with lining protectors or a grounding electrode) require only one gasket on each end connection, as shown in Figure 3-8. If grounding rings are used, gaskets are required on each side of the grounding ring, as shown in Figure 3-9.

Figure 3-8. Gasket Placement

Gasket (Supplied by user)

Figure 3-9. Gasket Placement with Non-attached Grounding Rings

Gasket (Supplied by user)

Grounding Ring

Gasket (Supplied by user)

Flange Bolts Suggested torque values by flowtube line size and liner type are listed in

Table 3-1 on page 3-8 for ASME B16.5 (ANSI) flanges and Table 3-2 and Table 3-3 for DIN flanges. Consult the factory for other flange ratings. Tighten flange bolts in the incremental sequence as shown in Figure 3-10. See Table 3-1 and Table 3-2 for bolt sizes and hole diameters.

8705-0040E

8705-0038D

See ”Safety Messages” on pages 3-1 and 3-2 for complete warning information.

3-7

Rosemount 8742C

Reference Manual

00809-0100-4793, Rev CA

August 2004

NOTE

Do not bolt one side at a time. Tighten each side simultaneously. Example:

1. Snug left

2. Snug right

3. Tighten left

4. Tighten right Do not snug and tighten left and then snug and tighten right. Failure to do so will result in liner damage.

Always check for leaks at the flanges after tightening the flange bolts. Failure to use the correct flange bolt tightening methods can result in severe damage. All flowtubes require a second torquing twenty-four hours after initial flange bolt tightening.

Table 3-1. Flange Bolt Torque Specifications for Rosemount 8705 and 8707 High-Signal Flowtubes

Teflon/Tefzel liner Polyurethane liner

Size Code Line Size

005 010 1 inch (25 mm) 8 12 — — 015 1 020 2 inch (50 mm) 19 17 14 11 030 3 inch (80 mm) 34 35 23 23 040 4 inch (100 mm) 26 50 17 32 060 6 inch (150mm) 45 50 30 37 080 8 inch (200 mm) 60 82 42 55 100 10 inch (250 mm) 55 80 40 70 120 12 inch (300 mm) 65 125 55 105 140 14 inch (350 mm) 85 110 70 95 160 16 inch (400 mm) 85 160 65 140 180 18 inch (450 mm) 120 170 95 150 200 20 inch (500 mm) 110 175 90 150 240 24 inch (600 mm) 165 280 140 250 300 30 inch (750 mm) 195 415 165 375 360 36 inch (900 mm) 280 575 245 525

/2-inch (15 mm) 8 8 — —

/2 inch (40 mm) 13 25 7 18

Class 150

(pound-feet)

Class 300

(pound-feet)

Class 150

(pound-feet)

Class 300

(pound-feet)

See ”Safety Messages” on pages 3-1 and 3-2 for complete warning information.

3-8

+ 106 hidden pages

Emerson Rosemount 8742C, 8700 Series Reference Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Section 1 Introduction

Section 2 Installation

Section 3 Flowtube Installation