Rosemount 8712ES Operating Manual
Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
Remote Mount Magnetic Flowmeter System
www.rosemount.com
Reference Manual
NOTICE
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
Remote Mount Magnetic Flowmeter System
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.
Rosemount Inc. has two toll-free assistance numbers:
Customer Central
Technical support, quoting, and order-related questions.
United States - 1-800-999-9307 (7:00 am to 7:00 pm CST)
Asia Pacific- 65 777 8211
Europe/ Middle East/ Africa - 49 (8153) 9390
North American Response Center
Equipment service needs.
1-800-654-7768 (24 hours—includes Canada)
Outside of these areas, contact your local Emerson Process Management representative.
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 Emerson
Process Management Sales Representative.
www.rosemount.com
Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8732
Table of Contents
SECTION 1
Introduction
SECTION 2
Installation
System Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Service Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Transmitter Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Mechanical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Environmental Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Installation Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Mount the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Identify Options and Configurations . . . . . . . . . . . . . . . . . . . . . . . 2-4
Hardware Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Conduit Ports and Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Conduit Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Electrical Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Installation Category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Overcurrent Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Options, Considerations, and Procedures . . . . . . . . . . . . . . . . . . . . . 2-9
Connect Transmitter Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Connect 4–20 mA Loop External Power Source. . . . . . . . . . . . . . 2-9
Connect Pulse Output Power Source . . . . . . . . . . . . . . . . . . . . . 2-10
Connect Auxiliary Channel 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Connect Auxiliary Channel 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
sensor Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Rosemount Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Transmitter to Sensor Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Conduit Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Sensor to Remote Mount Transmitter Connections . . . . . . . . . . 2-15
SECTION 3
Configuration
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Installation Check and Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Local Operator Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Basic Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Data Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Selecting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
LOI Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Table Value Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Select Value Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Diagnostic Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Review. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Process Variables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
PV - Primary Variable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
PV -% Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
PV - Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Totalizer Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Pulse Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
TOC-1
Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8732
Basic Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Flow Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Line Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
PV URV (Upper Range Value) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
PV LRV (Lower Range Value). . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Calibration Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
PV Damping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
SECTION 4
Operation
SECTION 5
Sensor Installation
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Diagnostic Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Basic Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Advanced Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Diagnostic Variable Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Trims . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Advanced Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Detailed Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Additional Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Configure Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
LOI Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31
Signal Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31
Universal Auto Trim. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34
Device Info. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Sensor Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Sensor Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Upstream/Downstream Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Sensor Orientation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Flow Direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Installation (Flanged Sensor) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Flange Bolts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Installation (Wafer Sensor). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
Flange Bolts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Installation (Sanitary Sensor) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Alignment and Bolting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Grounding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Process Leak Protection (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
Standard Housing Configuration . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
Relief Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
Process Leak Containment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17
TOC-2
Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8732
SECTION 6
Maintenance and
Troubleshooting
APPENDIX A
Reference Data
APPENDIX B
Approval
Information
APPENDIX C
Diagnostics
Safety Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Installation Check and Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Diagnostic Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Transmitter Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Quick Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Step 1: Wiring Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Step 2: Process Noise. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Step 3: Installed Sensor Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Step 4: Uninstalled Sensor Tests . . . . . . . . . . . . . . . . . . . . . . . . 6-10
Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6
Physical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
Rosemount 8712E Ordering Information . . . . . . . . . . . . . . . . . . . . . . A-9
Product Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Approved Manufacturing Locations . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
European Directive Information. . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Hazardous Locations Certifications. . . . . . . . . . . . . . . . . . . . . . . . B-1
Sensor Approval Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Diagnostic Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Licensing and Enabling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Licensing the 8712 Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Tunable Empty Pipe Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Tunable Empty Pipe Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . C-3
Optimizing Tunable Empty Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
Troubleshooting Empty Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4
Ground/Wiring Fault Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4
Ground/Wiring Fault Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . C-4
Troubleshooting Ground/Wiring Fault . . . . . . . . . . . . . . . . . . . . . . C-5
Ground/Wiring Fault Functionality. . . . . . . . . . . . . . . . . . . . . . . . . C-5
High Process Noise Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5
High Process Noise Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . C-6
Troubleshooting High Process Noise . . . . . . . . . . . . . . . . . . . . . . C-6
High Process Noise Functionality . . . . . . . . . . . . . . . . . . . . . . . . . C-7
8714i Meter Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8
Sensor Signature Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8
8714i Meter Verification Test Parameters. . . . . . . . . . . . . . . . . . . C-9
8714i Meter Verification Test Results Parameters . . . . . . . . . . . C-10
Optimizing the 8714i Meter Verification. . . . . . . . . . . . . . . . . . . . C-13
Troubleshooting the 8714i Meter Verification Test . . . . . . . . . . . C-14
8714i Meter Verification Functionality . . . . . . . . . . . . . . . . . . . . . C-14
Rosemount Magnetic Flowmeter Calibration Verification Report. . . C-16
APPENDIX D
Digital Signal
Processing
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
Auto Zero. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
Signal Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
TOC-3
Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8732
APPENDIX E
Universal Sensor
Wiring Diagrams
APPENDIX F
HART Field
Communicator
Operation
Rosemount Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-3
ABB Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-7
Brooks Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-9
Endress And Hauser Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-11
Fischer And Porter Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-15
Foxboro Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-22
Kent Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-28
Krohne Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-30
Siemens Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-33
Taylor Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-34
Toshiba Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-36
Yamatake Honeywell Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-37
Yokogawa Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-38
Generic Manufacturer Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-39
HandHeld Communicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1
Connections and Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2
Basic Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-3
Action Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-3
Alphanumeric and Shift Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-4
Fast Key Feature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-5
Menus and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-5
Main Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-5
Online Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-6
Diagnostic Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-7
TOC-4
Reference Manual
00809-0100-4664, Rev BA
January 2010
Section 1 Introduction
System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-1
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 1-2
Service Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-2
Rosemount 8712
SYSTEM DESCRIPTION The Rosemount
sensor and transmitter, and measures volumetric flow rate by detecting the
velocity of a conductive liquid that passes through a magnetic field.
There are four Rosemount magnetic flowmeter sensors:
• Flanged Rosemount 8705
• Flanged High-Signal Rosemount 8707
• Wafer-Style Rosemount 8711
• Sanitary Rosemount 8721
There are two Rosemount magnetic flowmeter transmitters:
• Rosemount 8712
• Rosemount 8732
The sensor is installed in-line with process piping — either vertically or
horizontally. Coils located on opposite sides of the sensor create a magnetic
field. Electrodes located perpendicular to the coils make contact with the
process fluid. 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 electronicall y
conditions the voltage detected by the electrodes to provide a flow sign al. The
transmitter can be integrally or remotely mounted from the sensor.
This manual is designed to assist in the installation and operatio n of the
Rosemount 8712 Magnetic Flowmeter Transmitter and the Rosemount 8700
Series Magnetic Flowmeter Sensors.
®
8700 Series Magnetic Flowmeter System consists of a
www.rosemount.com
Reference Manual
See “Safety Messages” on page D-1 for complete warning information.
00809-0100-4664, Rev BA
Rosemount 8712
January 2010
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.
Attempting to install and operate the Rosemount 8705, Rosemount 8707 High-Signal,
Rosemount 8711, or Rosemount 8721 Magnetic Sensors with the Rosemount 8712 or
Rosemount 8732 Magnetic Flowmeter Transmitter without reviewing the instructions
contained in this manual could result in personal injury or equipment damage.
SERVICE SUPPORT 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.
1-2
Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
Section 2 Installation
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 2-1
Transmitter Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-2
Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 2-2
Installation Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-4
Options, Considerations, and Procedures . . . . . . . . . . . .page 2-9
sensor Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-13
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.
SAFETY MESSAGES This symbol is used throughout this manual to indicate that special attention
to warning information is required.
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 oper ation in thi s section.
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 sensor and transmitter is consistent with the
appropriate hazardous area approval.
Do not connect a Rosemount 8712 to a non-Rosemount sensor that is located in an
explosive atmosphere.
www.rosemount.com
Rosemount 8712
Reference Manual
00809-0100-4664, Rev BA
January 2010
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 8712 reference manual for any restrictions associated with a
safe installation.
Before connecting a handheld 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 sensor liner is vulnerable to handling damage. Never place anything through the sensor
for the purpose of lifting or gaining leverage. Liner damage can render the sensor useless.
To avoid possible damage to the sensor 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 sensor ends are often used for protection.
Correct flange bolt tightening is crucial for proper sensor 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 sensor lining and possible sensor
replacement.
TRANSMITTER SYMBOLS
Caution symbol — check product documentation for details
Protective conductor (grounding) terminal
PRE-INSTALLATION Before installing the Rosemount 8712 Magnetic Flowmeter Transmitter, there
are several pre-installation steps that should be completed to make the
installation process easier:
• Identify the options and configurations that apply to your application
• Set the hardware switches if necessary
• Consider mechanical, electrical , an d en vir onm en tal req uir em e nts
Mechanical Considerations
The mounting site for the Rosemount 8712 transmitter should pr ovide enough
room for secure mounting, easy access to conduit ports, full opening of the
transmitter covers, and easy readability of the LOI screen (see Figure 2-1).
The transmitter should be mounted in a manner that prevents moisture in the
conduit from collecting in the transmitter.
The 8712 is mounted separately from the sensor, it
is not subject to limitations that might apply to the sensor.
2-2
Reference Manual
4.31
(109)
LOI Keypad
Cover
9.01
(229)
11.15
(283)
2.81
(71)
3.11
(79)
12.02
(305)
0.44
(11)
Ground Lug
1
/2–14 NPT
Conduit
Connection
(4 Places)
WITH ST ANDARD COVER
NOTE
Dimensions are in inches (millimeters)
2.96
(75)
WITH LOI COVER
00809-0100-4664, Rev BA
January 2010
Figure 2-1. Rosemount 8712
Dimensional Drawing
Rosemount 8712
2-3
Rosemount 8712
Reference Manual
00809-0100-4664, Rev BA
January 2010
Environmental Considerations
INSTALLATION PROCEDURES
To ensure maximum transmitter life, avoid excessive heat and vibration.
Typical problem areas:
• high-vibration lines with integrally mounted transmitters
• warm-climate installations in direct sunlight
• outdoor installations in cold climates.
Remote-mounted transmitters may be installed in the control room to protect
the electronics from the harsh environment and provides easy access for
configuration or service.
Rosemount 8712 transmitters require ex te rn al po we r an d th er e mu st be
access to a suitable power source.
Rosemount 8712 installation includes both detaile d mechanical and electrical
installation procedures.
Mount the Transmitter At a remote site the transmitter may be mounted on a pipe up to two inches in
diameter or against a flat surface.
Pipe Mounting
To mount the transmitter on a pipe:
1. Attach the mounting plate to the pipe using the mounting hardware.
2. Attach the 8712 to the mounting plate using the mounting screws.
Surface Mounting
To surface mount the transmitter:
1. Attach the 8712 to the mounting location using the mounting screws.
Identify Options and Configurations
The standard application of the 8712 includes a 4–20 mA output and control
of the sensor coils. Other applications may require one or more of the
following configurations or options:
• Multidrop Communications
• PZR (Positive Zero Return)
• Auxiliary Output
• Pulse Output
Additional options may apply. Be sure to identify those 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 8712 electronics board is equipped with
three user-selectable hardware switches. These switches set the Failure
Alarm Mode, Internal/External Analog Power, and Transmitter Security. The
standard configuration for these switches when shipped from the factory are
as follows:
Failure Alarm Mode: HIGH
Internal/External Analog Power: INTERNAL
Transmitter Security: OFF
2-4
Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
Changing Hardware Switch Settings
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 in the manual.
Definitions of these switches and their functions are provided below. If you
determine that the settings must be changed, see below.
Failure Alarm Mode
If the 8712 experiences a catastrophic failure in the electronics, the current
output can be driven high (23.25 mA) or low (3.75 mA). The switch is set in
the HIGH (23.25 mA) position when it is shipped from the factory.
Internal/External Analog Power
The Rosemount 8712 4–20 mA loop may be powered internally
or by an external power supply. The internal/external power supply switch
determines the source of the 4–20 mA loop power.
Transmitters are shipped from the factory with the switch set
in the INTERNAL position.
The external power option is required for mu ltidrop configur ations. A 10–3 0 V
DC external supply is required and the 4-20mA power switch must be set to
“EXT” position. For further information on 4–20 mA external power, see
Connect 4–20 mA Loop External Power Source on page 2-9.
Transmitter Security
The security switch on the 8712 allows the user to lock out any configuration
changes attempted on the transmitter. No changes to the configuration are
allowed when the switch is in the ON position. The flow rate indication and
totalizer functions remain active at all times.
With the switch in the ON position, you may still access and review any of the
operating parameters and scroll through the available choices, but no actual
data changes are allowed. Transmitter security is set in the OFF position
when shipped from factory.
Changing Hardware Switch Settings
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
below:
NOTE
The hardware switches are located on the non-component side of the
electronics board and changing their settings requires opening 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. Loosen the housing door screw and open the housing door.
3. Identify the location of each switch (see Figure 2-2).
4. Change the setting of the desired switches with a sm all scr ewd r iver.
5. Close the housing door and tighten the housing door screw.
2-5
Rosemount 8712
Figure 2-2. Rosemount 8712
Electronics Board and Hardware
Switches
Reference Manual
00809-0100-4664, Rev BA
January 2010
Conduit Ports and Connections
Both the sensor and transmitter junction boxes have ports for 1/2-in. NPT
conduit connections. These connections should be made in accordance with
local or plant electrical codes. Unused ports should be sealed with metal
plugs. Proper electrical installation is necessary to prevent errors due to
electrical noise and interference. Separate conduits are not necessary for the
two cables, but a dedicated conduit line between each transmitter and sensor
is required. Shielded cable must be used for best results in electrically
noisy environments.
Example 1: Installing flanged sensors into an IP68 area. Sensors must be
installed with IP68 cable glands and cable to maintain IP68 rating. Unused
conduit connections must be properly sealed to prevent water ingress. For
added protection, dielectric gel can be used to pot the sensor terminal block.
Example 2: Installing flowmeters into explosion proof/flameproof areas.
Conduit connections and conduit must be rated for use in the hazardous area
to maintain flowmeter approval rating.
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 e lectrode cables between the flowmeter
and transmitter. Refer to Electrical Considerations for wire type. 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.
Excessive lead length or failure to connect cable shields can create electrical
noise resulting in unstable meter readings.
• Installed signal wiring should not be run together an d should not be in
the same cable tray as AC or DC power wiring.
• Device must be properly grounded or earthed according to local
electric codes.
• Rosemount combination cable model number 08712-0752-0001 (ft) or
08712-0752-0003 (m) is required to be used to meet EMC
requirements.
2-6
Reference Manual
NOTE
Dimensions are in
inches
(millimeters).
1.00
(26)
Cable Shield
Maximum Resis cetan
Supply Voltage 12– VDC
1amp
------------------------------------------------------------------------=
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
Figure 2-3. Cable Preparation
Detail
Electrical Considerations Before making any electrical connections to the Rosemount 8712, consider
the following standards and be sure to have the pro per power supply, conduit,
and other accessories.
Transmitter Input Power
The 8712 transmitter is designed to be powered by 90-250 V AC, 50–60 Hz
or 12–42 V DC. The eight digit in the transmitter model number designates
the appropriate power supply requirement.
Model Number Power Supply Requirement
2 12-42 V DC
1 90-250 V AC
Supply Wire Temperature Rating
Use 12 to 18 AWG wire. For connections in ambient temperatures
exceeding 140 °F (60 °C), use wire rated to at least 194 °F (90 °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.
Requirements for 90-250 V AC Power Supply
Wire the transmitter according to local electrical requirements for the supply
voltage. In addition, follow the supply wire and disconnect requirements on
page 2-9.
Requirements for 12-42 V DC Power Supply
Units powered with 12-42 V DC may draw up to 1 amp of cu rren t. As a result,
the input power wire must meet certain gauge requirements.
Figure 2-4 shows the surge current for each corresponding supply voltage.
For combinations not shown, you can calculate the maximum distance given
the supply current, the voltage of the source, and the minimum start-up
voltage of the transmitter, 12 V DC, using the following equation:
Use Table 2-1 and Table 2-2 to determine the maximum wire length allowable
for your power supply and maximum resistance.
2-7
Rosemount 8712
1.0
0.8
0.6
0.4
0.2
0
0
10
20 30
40
50
Power Supply (Volts)
Supply Current (Amps)
Table 2-1. Length of Annealed
Copper (cu) Wires
Table 2-2. Length of
Hand-drawn Copper (cu) Wires
Types of Power
Supply Wires
Wire
Gauge
20 0.01015
18 0.006385
16 0.004016
14 0.002525
12 0.001588
10 0.000999
Wire
Gauge
18 0.00664
16 0.004176
14 0.002626
12 0.001652
10 0.01039
Annealed Cu
milliohms/ft
(milliohms/m)
(0.033292)
(0.020943)
(0.013172)
(0.008282)
(0.005209)
(0.003277)
Types of Power
Supply Wires
Annealed Cu
milliohms/ft
(milliohms/m)
(0.021779)
(0.013697)
(0.008613)
(0.005419)
(0.003408)
42 V DC
Supply ft (m)
1478
(451)
2349
(716)
3735
(1139)
5941
(1811)
9446
(2880)
15015
(4578)
Each Corresponding Power Supply Source
42 V DC
Supply ft (m)
2259
(689)
3592
(1095)
5712
(1741)
9080
(2768)
14437
(4402)
Reference Manual
00809-0100-4664, Rev BA
January 2010
Maximum Length of the Wire for Each
Corresponding Power Supply Source
30 V DC
Supply ft (m)
887
(270)
1410
(430)
2241
(683)
3564
(1087)
5668
(1728)
9009
(2747)
Maximum Length of the Wire for
30 V DC
Supply ft (m)
1355
(413)
2155
(657)
3427
(1045)
5448
(1661)
8662
(2641)
20 V DC
Supply ft (m)
394
(120)
626
(191)
996
(304)
1584
(483)
2519
(768)
4004
(1221)
20 V DC
Supply ft (m)
602
(184)
958
(292)
1523
(464)
2421
(738)
3850
(1174)
12.5 V DC
Supply ft (m)
25
(8)
39
(12)
62
(19)
99
(30)
157
(48)
250
(76)
12.5 V DC
Supply ft (m)
38
(11)
60
(18)
95
(29)
151
(46)
241
(73)
Figure 2-4. Supply Current
versus Input Voltage
2-8
Reference Manual
Transmitter
Power Cable
AC Neutral or
AC Line or
AC Ground or
DC Ground
Fuse
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
Installation Category The installation category for the Rosemount 8712 is
(Overvoltage) Category II.
Overcurrent Protection The Rosemount 8712 Flowmeter Transmitter requires overcurrent protection
of the supply lines. Maximum ratings of overcurrent devices are as follows:
Power System Fuse Rating Manufacturer
90–250 V AC 2 Amp, Quick Acting Bussman AGCI or Equivalent
12-42 V DC 3 Amp, Quick Acting Bussman AGC3 or Equivalent
OPTIONS, CONSIDERATIONS, AND PROCEDURES
Connect Transmitter Power
Figure 2-5. Transmitter Power
Connections
If the application of the 8712 includes the use of options such as multidrop
communications, auxiliary output control, or pulse output, certain
requirements may apply in addition to those previously listed. Be prepared to
meet these requirements before attempting to install and operate the
Rosemount 8712.
To connect power to the transmitter, complete the following steps.
1. Ensure that the power source and connecting cable meet the
requirements outlined on page 2-8.
2. Turn off the power source.
3. Open the power terminal cover.
4. Run the power cable through the conduit to the transmitter.
5. Loosen the terminal guard for terminals L1 and N.
6. Connect the power cable leads as shown in Figure 2-5.
a. Connect AC Neutral or DC- to terminal N.
b. Connect AC Line or DC+ to terminal L1.
c. Connect AC Ground or DC Ground to the ground screw mounted
on the transmitter enclosure.
Connect 4–20 mA Loop External Power Source
The 4–20 mA output loop provides the process variable output from the
transmitter. Its signal may be powered internally or externally. The default
position of the internal/external analog power switch is in the internal position.
The user-selectable power switch is located on the electronics board.
2-9
Rosemount 8712
–4–20 mA power
+4–20 mA power
Fuse
Reference Manual
00809-0100-4664, Rev BA
January 2010
Internal
The 4–20 mA analog power loop may be powered from the transmitter
itself. Resistance in the loop must be 1,000 ohms or less. If a Handheld
Communicator or control system will be used, it must be connected across
a minimum of 250 ohms resistance in the loop.
External
HART multidrop installations require a 10–30 V DC external power source
(see Multidrop Communications on page 3-16). If a Handheld
Communicator or control system is to be used, it must be connected
across a minimum of 250 ohms resistance in the loop.
To connect external power to the 4–20 mA loop, complete the
following steps.
1. Ensure that the power source and connecting cable meet the
requirements outlined above and in Electrical Co nsiderations on pa ge
2-7.
2. Turn off the transmitter and analog power sources.
3. Run the power cable into the transmitter.
4. Connect –DC to Terminal 8.
5. Connect +DC to Te rminal 7.
Figure 2-6. 4–20 mA Loop
Power Connections
Connect Pulse Output Power Source
Refer to Figure 2-6 on page 2-10.
The pulse output function provides an isolated switch-closure frequency
signal that is proportional to the flow through the sensor . The signal is typically
used in conjunction with an external totalizer or control system. The following
requirements apply:
Supply Voltage: 5 to 24 V DC
Load Resistance: 1,000 to 100 k ohms (typical
Pulse Duration: 1.5 to 500 msec (adjustable), 50% duty cycle below 1.5 msec
Maximum Power: 2.0 watts up to 4,000 Hz and 0.1 watts at 10,000 Hz
Switch Closure: solid state switch
5 k)
2-10
Reference Manual
Electro-mecha
nical Counter
5–28 V DC
Power
Supply
+
–
–
–
+ +
Electronic
Counter
5–28 V DC
Power
Supply
1k to 100 k
Typical 5 k
–
+
+
–
+
–
00809-0100-4664, Rev BA
January 2010
Figure 2-7. Connecting to a
Electromechanical
Totalizer/Counter
Rosemount 8712
The pulse output option requires an external power source . Complete the
following steps to connect an external power suppl y.
1. Ensure that the power source and connecting cable meet the
requirements outlined previously.
2. Turn off the transmitter and pulse output power sources.
3. Run the power cable to the transmitter.
4. Connect –DC to terminal 6.
5. Connect +DC to terminal 5.
Refer to Figure 2-7 and Figure 2-8.
Figure 2-8. Connecting to a
Electronic Totalizer/Counter
without Integral Power Supply
Connect Auxiliary Channel 1
Auxiliary channel 1 can be configured as either a digital input or a digital
output. When configured as an input, the following requirements apply:
Supply Voltage: 5 to 28V DC
Maximum Power: 2 watts
Switch Closure: optically isolated solid state switch
Maximum Impedance 2.5 k
When using channel 1 as a digital input, the power source and the control
relay must be connected to the transmitter. See Figu re 2-9 for more deta ils on
this connection.
2-11
Rosemount 8712
DC–
DC+
Fuse
Control Relay
or Input
Reference Manual
00809-0100-4664, Rev BA
January 2010
When configured as an output, the following requirements apply:
Supply Voltage: 5 to 28V DC
Maximum Power: 2 watts
Switch Closure: optically isolated solid state switch
When using channel 1 as a digital output, the power source must be
connected to the transmitter. See Figure 2-10 for more details on this
connection.
When connecting power to channel 1, complete the following steps:
1. Ensure that the power source and connecting cable meet the
requirements outlined previously.
2. Turn off the transmitter and auxiliary power sources.
3. Run the power cable to the transmitter.
4. Connect –DC to terminal 10.
5. Connect +DC to terminal 9.
Figure 2-9. Connect Digital Input
1 to Relay or Input to Control
System
Connect Auxiliary Channel 2
Auxiliary channel 2 is configured to provide a digital output based on the
configuration parameters set in the transmitter.
The following requirements apply to this channel:
Supply Voltage: 5 to 28V DC
Maximum Power: 2 watts
Switch Closure: optically isolated solid state switch
When connecting power to channel 2, complete the following steps:
1. Ensure that the power source and connecting cable meet the
requirements outlined previously.
2. Turn off the transmitter and auxiliary power sources.
3. Run the power cable to the transmitter.
4. Connect –DC to terminal 20.
5. Connect +DC to terminal 16.
2-12
See Figure 2-10 for more details on this connection.
Reference Manual
Coil Drive
and
Electrode
Cables
Power
Power
Outputs
Outputs
Coil Drive
and
Electrode
Cables
Power
Outputs
Power
Outputs
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
Figure 2-10. Connecting Digital
Outputs
SENSOR CONNECTIONS This section covers the steps required to physically install the transmitter
including wiring and calibration.
Rosemount Sensors To connect the transmitter to a non-Rosemount sensor, refer to the
appropriate wiring diagram in Appendix D: Wiring Diagrams. The calibration
procedure listed is not required for use with Rosemount sensors.
Transmitter to Sensor Wiring
Figure 2-11. Conduit Preparation
Flanged and wafer sensors have two conduit ports as shown in Figures 4-13,
4-14, 4-15, and 4-16. 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 sensor 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 2-11 for proper
conduit installation diagram and Table 2-3 for recommended cable. For
integral and remote wiring diagrams refer to Figure 2-13.
Correct Incorrect
2-13
Rosemount 8712
1.00
(26)
NOTE
Dimensions are in
inches (millimeters).
Cable Shield
Reference Manual
00809-0100-4664, Rev BA
January 2010
Table 2-3. Cable Requirements
Description Units Part Number
Signal Cable (20 AWG) Belden 8762, Alpha 2411 equivalent ftm08712-0061-0001
Coil Drive Cable (14 AWG) Belden 8720, Alpha 2442 equivalent ftm08712-0060-0001
Combination Signal and Coil Drive Cable (18 AWG)
(1) Combination signal and coil drive cable is not recommended for
high-signal magmeter system. For remote mount installati ons, combination signal and coil drive cable
should be limited to less than 300 ft. (100 m).
(1)
Rosemount recommends using the combination signal and coil drive for N5,
E5 approved sensors for optimum performance.
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 sensor.
08712-0061-0003
08712-0060-0003
ftm08712-0752-0001
08712-0752-0003
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 e lectrode cables between the flowmeter
and transmitter.
Prepare the ends of the coil drive and electrode cables as shown in Figure
2-12. Limit the unshielded wire length to 1-inch o n both the ele ctrode and co il
drive cables.
NOTE
Excessive lead length or failure to connect cable shields can create electrical
noise resulting in unstable meter readings.
Figure 2-12. Cable Preparation
Detail
2-14
Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
Sensor to Remote Mount Transmitter Connections
Figure 2-13. Wiring Diagram
Connect coil drive and electrode cables as shown in Figure 2-13.
Do not connect AC power to the sensor or to terminals 1 and 2 of the
transmitter, or replacement of the electronics board will be necessary.
Rosemount 8712 Transmitter Rosemount 8705/8707/8711/8721 sensors
11
2 2
17 17
18 18
19 19
2-15
Rosemount 8712
Reference Manual
00809-0100-4664, Rev BA
January 2010
2-16
Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
Section 3 Configuration
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-1
Installation Check and Guide . . . . . . . . . . . . . . . . . . . . . .page 3-1
Basic Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-3
LOI Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 3-4
Diagnostic Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-6
Process Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 3-6
Basic Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-8
INTRODUCTION This section covers basic operation, software functionality, and configuration
procedures for the Rosemount 8712 Magnetic Flowmeter Transmitter. For
information on connecting another manufacturer’s sensor , refer to “Universal
Sensor Wiring Diagrams” on page E-1.
The Rosemount 8712 features a full range of software functions for
configuration of output from the transmitter. Software functions are accessed
through the LOI, AMS, a Handheld Communicator, or a control system.
Configuration variables may be changed at any time and specific instructions
are provided through on-screen instructions.
INSTALLATION CHECK AND GUIDE
Table 3-1. Parameters
Basic Set-up Parameters Page
Review page 3-6
Process Variables page 3-6
Basic Setup page 3-8
Flow Units page 3-8
Range Values page 3-11
PV Sensor Calibration Number page 3-12
Totalizer Setup page 3-7
Use this guide to check new installations of Rosemount magnetic flowmeter
systems that appear to malfunction.
Before You Begin
www.rosemount.com
Rosemount 8712
Reference Manual
00809-0100-4664, Rev BA
January 2010
Transmitter
Apply power to your system before making the following transmitter checks.
1. Verify that the correct sensor calibration number is entered in the
transmitter. The calibration number is listed on the sensor nameplate.
2. Verify that the correct sensor line size is entered in the transmitter.
The line size value is listed on the sensor nameplate.
3. Verify that the a nalog range of the transmitter matches the analog
range in the control system.
4. Verify that the forced analog output of the transmitter produces the
correct output at the control system.
Sensor
Be sure that power to your system is removed before beginning sensor
checks.
1. For horizontal flow inst a llations , ensu re that the ele ctrodes remain
covered by process fluid.
For vertical or inclined installations, ensure that the process fluid
is flowing up into the sensor to keep the electrodes covered by
process fluid.
2. Ensure that the grounding straps on the sensor are connected to
grounding rings, lining protectors, or the adjacent pipe flanges.
Improper grounding will cause erratic operation of the system.
Wiring
1. The signal wire and coil drive wire must be twisted shielded cable.
Emerson Process Management, Rosemount division. recommends
20 AWG twisted shielded cable for the electrodes and 14 AWG
twisted shielded cable for the coils.
2. The cable shield must be connected at both ends of the electrode and
coil drive cables. Connection of the shield at both ends is absolutely
necessary for proper operation.
3. The signal and coil drive wires must be separate cables, unless
Emerson Process Management specified combo cable is used.
4. The single conduit that houses both the signal and coil drive cables
should not contain any other wires.
Process Fluid
1. The process fluid conductivity should be 5 microsiemens
(5 micro mhos) per centimeter minimum.
2. The process fluid must be free of air and gasses.
3. The sensor should be full of process fluid.
LOCAL OPERATOR INTERFACE
3-2
Refer to Section 6 "Maintenance and Troubleshooting" for further information.
The optional Local Operator Interface (LOI) provides an operator
communications center for the 8712. By usin g th e LO I, th e op er at or can
access any transmitter function for changing configuration paramete r settings,
checking totalized values, or other functions. The LOI is integral to the
transmitter housing.
Reference Manual
DISPLAY CONTROL TOTALIZER
TRANSMITTER PARAMETERS
DAT A
ENTRY
FLOW
RATE
TOTALIZE
START
STOP
READ
RESET
TUBE CAL
NO.
TUBE
SIZE
UNITS
AUX.
FUNCTION
ANALOG
OUTPUT
RANGE
PULSE
OUTPUT
SCALING
DAMPING XMTR
INFO
SHIFT
ENTER
INCR.
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
BASIC FEATURES The basic features of the LOI include display control, tot al izer, data entry, and
transmitter parameters. These features provide control of all transmitter
functions, see Figure 3-1.
Display Control Keys
The display control keys provide control over the variable displayed on the
LOI screen. Push FLOW RATE to display the process variable, or push
TOTALIZE to display the totalized value.
Totalizer Keys
The totalizer keys enable you to start, stop, read, and reset the totalizer.
Data Entry Keys
The data entry keys enable you to move the display cursor, incrementally
increase the value, or enter the selected value.
Transmitter Parameter Keys
The transmitter parameter keys provide direct access to the most common
transmitter parameters and stepped access to the advanced functions of the
8712 through the AUX. FUNCTION key.
Figure 3-1. Local Operator
Interface Keypad
Data Entry The LOI keypad does not have numerical keys. Numerical data is entered by
the following procedure.
1. Access the appropriate function.
2. Use SHIFT to highlight the digit you want to enter or change.
3. Use INCR. to change the highlighted value. For numerical data,
4. Use SHIFT to highlight other digits you want to change and
5. Press ENTER.
INCR. toggle through the digits 0–9, decimal point, and dash. For
alphabetical data, toggle through the letters of the alphabet A–Z,
digits 0–9, and the symbols l,&, +, -, *, /, $, @,%, and the blank
space. (INCR. is also used to toggle throu gh pre- determined ch oices
that do not require data entry.)
change them.
3-3
Reference Manual
00809-0100-4664, Rev BA
Rosemount 8712
January 2010
Selecting Options To select pre-defined software options on the LOI, use the
following procedure:
1. Access the appropriate option.
2. Use SHIFT or INCR. to toggle between the applicable choices.
3. Press ENTER when the desired choice is displayed on the screen.
LOI EXAMPLES Use the TRANSMITTER PARAMETER keys shown in Figure 3-1 to change
the parameters, which are set in one of two ways, table values or select
values.
Table Values:
Parameters such as units, that are available from a predefined list
Select Values:
Parameters that consist of a user-created number or character string, such
as calibration number; values are entered one character at a time using
the data entry keys
Table Value Example Setting the sensor line size:
1. Press TUBE SIZE.
2. Press SHIFT or INCR. to increase (incrementa lly) the size to the next
value.
3. When you reach the desired size, press ENTER.
4. Set the loop to manual if necessary, and press ENTER again.
After a moment, the LCD will display the new tube size and the maximum flow
rate.
Select Value Example Changing the ANALOG OUTPUT RANGE:
1. Press ANALOG OUTPUT RANGE.
2. Press SHIFT to position the cursor.
3. Press INCR. to set the number.
4. Repeat steps 2 and 3 until desired number is displayed.
5. Press ENTER.
After a moment, the LCD will display the new analog output range.
Table 3-2. LOI Data Entry Keys and Functions
Data Entry Keys Function Performed
Shift
Increment
Enter Stores the displayed value previously selected with the SHIFT and INCR. keys
Display Control Keys Function Performed
Flow Rate Displays the user-selected parameters for flow indication
Totalize Displays the present totalized output of the transmitter, and activates the Totalizer group of keys
Start/Stop Starts the totalizing display if it is stopped, and stops the display if it is running
Read/Reset Resets the net totalizing display to zero if it is stopped, and halts the display if the display is running
• Moves the blinking cursor on the display one character to the right
• Scrolls through available values
• Increments the character over the cursor by one
• Steps through all the digits, letters, and symbols that are applicable to the present operation
• Scrolls through available values
The choices, Forward and Reverse totals or Net and Gross totals, are selected in Auxiliary Functions
3-4
Loading...