Rosemount Quick Start Guide: Magnetic Flow Meter Systems (Transmitter and Flowtube) - 8712D, 8700 Series | Rosemount Manuals & Guides

Quick Installation Guide

Product Discontinued

00825-0100-4661, Rev AA
November 2003

Rosemount 8712D / 8700 Series

Rosemount Magnetic Flowmeter
Systems (Transmitter and Flowtube)

Start

Step 1: Pre-Installation

Step 2: Wiring

Step 3: Basic Configuration

Step 4: Handling

Step 5: Mounting

Step 6: Installation (Flanged Flowtubes)

Step 6: Installation (Wafer Flowtubes)

Step 6: Installation (Sanitary Flowtubes)

Step 7: Grounding

Product Certificates

Step 8: Process Leak Protection (Optional)

Step 9: Power up the Transmitter

Step 10: Check Process Connections

Step 11: Confirm Configuration

End

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www.rosemount.com

Quick Installation Guide

00825-0100-4661, Rev AA
November 2003

© 2003 Rosemount Inc. All rights reserved. All marks property of owner.

Rosemount Inc.

12001 Technology Drive
Eden Prairie, MN USA
55344
T (US) [phone]
T (Intnl) [phone]
F [phone]

Rosemount 8712D / 8700 Series

Emerson Process Management

Wiltonstraat 30
3905 KW Veenendaal
The Netherlands
T [phone]
F [phone]

IMPORTANT NOTICE

This installation guide provides basic guidelines for the
Rosemount
configuration, diagnostics, maintenance, service and
troubleshooting installations. Refer to the 8712D reference manual
(document number 00809-0100-4661) for more instruction. The
manual and this QIG are also available electronically on
www.rosemount.com.

®

8712D. It does not provide instructions for detailed

WARNING

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 8712D to a non-Rosemount flowtube
that is located in an explosive atmosphere.

Quick Installation Guide

00825-0100-4661, Rev AA
November 2003

Rosemount 8712D / 8700 Series

WARNING

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 8712D 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.

WARNING

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.

Quick Installation Guide

00825-0100-4661, Rev AA
November 2003

Rosemount 8712D / 8700 Series

STEP 1: PRE-INSTALLATION

Before installing the Rosemount 8712D 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, and environmental requirements

Mechanical Considerations

The mounting site for the Rosemount 8712D transmitter should
provide 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 1). The transmitter should be mounted in an
manner that prevents moisture in conduit from collecting in the
transmitter.

The 8712D is mounted separately from the flowtube, it
is not subject to limitations that might apply to the flowtube.

Figure 1. Rosemount 8712D Dimensional Drawing

LOI Cover

Standard

Cover

4.31

(109)

3.51
(89)

9.01

(229)

2.81
(71)

With LOI Cover

3.11
(79)

0.44
(11)

2.96
(75)

11.15
(283)

12.02
(305)

Quick Installation Guide

00825-0100-4661, Rev AA
November 2003

Rosemount 8712D / 8700 Series

Environmental Considerations

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 8712D transmitters require external power and there must
be access to a suitable power source.

Installation Procedures

Rosemount 8712D installation includes both detailed 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 8712D to the mounting plate using the mounting screws.

Surface Mounting

To surface mount the transmitter:

1. Attach the 8712D to the mounting location using the mounting

screws.

Quick Installation Guide

00825-0100-4661, Rev AA
November 2003

Rosemount 8712D / 8700 Series

Identify Options and Configurations

The standard application of the 8712D includes a 4–20 mA output and
control of the flowtube 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 Jumpers/Switches

The 8712D 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

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.

Electrical Considerations

Before making any electrical connections to the 8712D, consider the
following standards and be sure to have the proper power supply,
conduit, and other accessories.

Quick Installation Guide

00825-0100-4661, Rev AA
November 2003

Rosemount 8712D / 8700 Series

STEP 2: WIRING

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. 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 flowtube is required. Shielded cable
must be used for best results in electrically noisy environments.

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. 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.

Quick Installation Guide

00825-0100-4661, Rev AA
November 2003

Figure 2. Cable Preparation Detail

Cable Shield

Rosemount 8712D / 8700 Series

1.00
(26)

NOTE
Dimensions are in
inches (millimeters).

Step 2.1 Transmitter Coil Input

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.

Figure 3. Transmitter Power Connections

8705_0041a.eps

8712/8712e01c.eps

Quick Installation Guide

00825-0100-4661, Rev AA
November 2003

Wire the transmitter according to local electrical requirements. Ground
the transmitter cage via the threaded conduit connection (see
Figure 2). 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 12-42 V dc power supply may draw up to 1 amp of current. In
addition, follow the supply wire and disconnect requirements below:

Figure 4. Power Supply Current

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 at least 176 °F (80 °C). For ambients greater than 176 °F
(80 °C), use a wire rated for at least 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.

Rosemount 8712D / 8700 Series

1.0

0.8

0.6

0.4

0.2

Supply Current (Amps)

0

0

20 30

10

Power Supply (Volts)

40

50

Quick Installation Guide

00825-0100-4661, Rev AA
November 2003

Rosemount 8712D / 8700 Series

Installation Category

The installation category for the Rosemount 8712D is (Overvoltage)
Category II.

Overcurrent Protection

The Rosemount 8712D Flowmeter Transmitter requires overcurrent
protection of the supply lines. Maximum ratings of overcurrent devices
are as follows:

Power

System

12-42 V DC 250 V; 3 Amp, Quick Acting Bussman AGCI or Equivalent

90-250 V AC 250 V; 1 Amp, Quick Acting Bussman AGCI or Equivalent

Requirements for 115 V ac or 230 V ac Power Supply

Wire the transmitter according to local electrical requirements for
90 - 250 V AC. In addition, follow the supply wire and disconnect
requirements below:

Requirements for 12-42 V dc Power Supply

Units powered with 12-42 V DC may draw up to 1 amp of current. As a
result, the input power wire must meet certain gauge requirements.
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:

Fuse Rating Manufacturer

MaximumResis cetan

SupplyVoltage 12Vdc–

--------------------------------------------------------------------=
SupplyCurrent

Quick Installation Guide

00825-0100-4661, Rev AA
November 2003

Table 1. Length of Annealed Copper (cu) Wires

Types of Power

Supply Wires

Wire

Gauge

Table 2. Length of Hand-drawn Copper (cu) Wires

Gauge

Annealed Cu

milliohms/ft

(milliohms/m)

20 0.01015

18 0.006385

16 0.004016

14 0.002525

12 0.001588

10 0.000999

Wire

18 0.00664

16 0.004176

14 0.002626

12 0.001652

10 0.01039

(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)

Rosemount 8712D / 8700 Series

Maximum Length of the Wire for Each

Corresponding Power Supply Source

42 V

Supply ft

(m)

1478
(451)

2349
(716)

3735

(1139)

5941

(1811)

9446

(2880)
15015

(4578)

Maximum Length of the Wire for Each

Corresponding Power Supply Source

42 V

Supply ft

(m)

2259
(689)

3592

(1095)

5712

(1741)

9080

(2768)
14437

(4402)

30 V

Supply ft

(m)

887

(270)
1410

(430)
2241

(683)
3564

(1087)

5668

(1728)

9009

(2747)

30 V

Supply ft

(m)

1355
(413)

2155
(657)

3427

(1045)

5448

(1661)

8662

(2641)

20 V

Supply ft

(m)

394

(120)

626

(191)

996

(304)
1584

(483)
2519

(768)
4004

(1221)

20 V

Supply ft

(m)

602

(184)

958

(292)
1523

(464)
2421

(738)
3850

(1174)

12.5 V

Supply ft

(m)

25
(8)

39

(12)

62

(19)

99

(30)
157

(48)
250

(76)

12.5 V

Supply ft

(m)

38

(11)

60

(18)

95

(29)
151

(46)
241

(73)

Quick Installation Guide

00825-0100-4661, Rev AA
November 2003

Rosemount 8712D / 8700 Series

Options, Considerations, and Procedures

Step 2.2 Transmitter Communication Input
Connect 4–20 mA Loop External Power Source

The 4–20 mA output loop signal may be powered internally or
externally. The default position of the internal/external analog power
jumper is in the internal position. The user-selectable power supply
jumper is located on the electronics board.

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 HART
Communicator or control system will be used, it must be connected
across a minimum of 250 ohms resistance in the loop.

Quick Installation Guide

00825-0100-4661, Rev AA
November 2003

External

HART multidrop installations require a 10–30 V dc external analog
power source. If a HART 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, connect -dc to
Terminal 8 and +dc to Terminal 7. (See Figure 3)

NOTE

To connect any of the other output options (pulse output for totalizing,
auxiliary output for switch closure, or positive zero return), consult the
the comprehensive product manual.

Rosemount 8712D / 8700 Series

Step 2.3 Transmitter to Flowtube Wiring

A single dedicated conduit run for the coil drive and electrode cables is
recommended between a flowtube and a remote transmitter. Bundled
cables in a single conduit are likely to create interference and noise
problems in your system. One set of cables per conduit run is
recommended. If wiring from multiple systems must be combined,
group electrode wiring in one conduit, and coil drive wiring in a
separate conduit.