Rosemount 8712EM Transmitter with HART Protocol Quick Start Guide

1 Safety

⚠️ WARNING!

• Failure to follow these installation guidelines could result in serious injury or death.
• 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.
• Rosemount Magnetic Flowmeters ordered with non-standard paint options or non-metallic labels may be subject to electrostatic discharge. To avoid electrostatic charge build-up, do not rub the flowmeter with a dry cloth or clean with solvents.
• Verify that the operating environment of the sensor and transmitter is consistent with the appropriate Agency Approval.
• If installed in an explosive atmosphere, verify that the device certification and installation techniques are suitable for that particular environment.
• To prevent ignition of flammable or combustible atmosphere, disconnect power before servicing circuits.
• Explosion hazard—Do not disconnect equipment when a flammable or combustible atmosphere is present.
• Do not connect a Rosemount Transmitter to a non-Rosemount sensor when installed in an “Ex” environment, explosive atmosphere, hazardous area, or classified area.
• Follow national, local, and plant standards to properly earth ground the transmitter and sensor. The earth ground must be separate from the process reference ground.

⚠️ CAUTION!

• In cases where high voltage/high current are present near the meter installation, ensure proper protection methods are followed to prevent stray voltage/current from passing through the meter. Failure to adequately protect the meter could result in damage to the transmitter and lead to meter failure.
• Completely remove all electrical connections from both sensor and transmitter prior to welding on the pipe. For maximum protection of the sensor, consider removing it from the pipeline.

2 Introduction

This document provides basic installation guidelines for the Rosemount 8712EM wall-mount transmitter.

• For sensor installation refer to the Rosemount® 8700 Magnetic Flowmeter Sensor Quick Installation Guide
• For additional installation information, configuration, maintenance, and troubleshooting, refer to the Rosemount® 8712EM Transmitter with HART Protocol Reference Manual

All user documentation can be found at www.emerson.com. For more contact information see Section 2.2.

2.1 Return policy

Emerson procedures must be followed when returning equipment. These procedures ensure legal compliance with government transportation agencies and help provide a safe working environment for Emerson employees. Failure to follow Emerson procedures will result in your equipment being refused delivery.

2.2 Emerson Flow customer service

Email:

• Worldwide: flow.support@emerson.com
• Asia-Pacific: APflow.support@emerson.com

Telephone:

3 Pre-installation

Before installing the transmitter, there are several pre-installation steps that should be completed to make the installation process easier:

• Identify options and configurations that apply to your application
• Set the hardware switches if necessary
• Consider mechanical, electrical, and environmental requirements

Note: Refer to the product reference manual for more detailed requirements.

Identify options and configurations

The typical transmitter installation includes a device power connection, a 4-20mA output connection, and sensor coil and electrode connections. Other applications may require one or more of the following configurations or options:

• Pulse output
• Discrete input/discrete output
• HART multidrop configuration

Hardware switches

The transmitter may have up to four user-selectable hardware switches. These switches set the alarm mode, internal/external analog power, internal/ external pulse power, and transmitter security. The standard configuration for these switches when shipped from the factory is as follows:

The analog power switch and pulse power switches are not available when ordered with intrinsically safe output, ordering code B.

In most cases, it is not necessary to change the setting of the hardware switches. If the switch settings need to be changed, refer to the product reference manual.

Mechanical considerations

The mounting site for the transmitter should provide enough room for secure mounting, easy access to conduit entries, full opening of the transmitter covers, and easy readability of the Local Operator Interface (LOI) screen (if equipped).

3.1 Dimensional Drawing

Figure 3-1: Rosemount 8712EM Dimensional Drawing

The diagram shows the physical dimensions of the Rosemount 8712EM transmitter. Key dimensions are provided in inches [millimeters].

• A. Conduit entry: 1/2-14 NPT (4 places)
• B. Ground lug
• C. LOI keypad cover
• D. Lower cover opens for electrical connections

Note: Dimensions are in inches [Millimeters].

Electrical considerations

Before making any electrical connections to the transmitter, consider national, local, and plant electrical installation requirements. Be sure to have the proper power supply, conduit, and other accessories necessary to comply with these standards.

The transmitter requires external power. Ensure access to a suitable power source.

Environmental considerations

To ensure maximum transmitter life, avoid extreme temperatures and excessive vibration. Typical problem areas include the following:

• Tropical or desert installations in direct sunlight
• Outdoor installations in arctic climates

Remote mounted transmitters may be installed in the control room to protect the electronics from the harsh environment and to provide easy access for configuration or service.

4 Mounting

Wall mount transmitters are shipped with mounting hardware for use on a 2-in. pipe or flat surface.

Figure 4-1: Mounting bracket

The diagram shows the mounting bracket components: A (U-bolt), B (Saddle clamp), and C (Fasteners).

4.1 Pipe mounting

1. Attach the saddle clamp to the pipe using the U-bolt mounting hardware.
2. Attach the transmitter to the saddle clamp assembly with appropriate fasteners.

4.2 Surface mounting

Attach the transmitter to the mounting location using customer supplied mounting screws. The installation of the transmitter shall be rated for four (4) times the weight of the transmitter or 44lbs (20kgs).

5 Wiring

5.1 Conduit entries and connections

Transmitter conduit entries ports are ½"-14NPT as standard, M20 conduit connections will use an adapter. Conduit connections should be made in accordance with national, local, and plant electrical codes. Unused conduit entries should be sealed with the appropriate certified plugs. The plastic shipping plugs do not provide ingress protection.

5.2 Conduit requirements

• For installations with an intrinsically safe electrode circuit, a separate conduit for the coil cable and the electrode cable may be required. Refer to the product reference manual.
• For installations with non-intrinsically safe electrode circuit, or when using the combination cable, a single dedicated conduit run for the coil drive and electrode cable between the sensor and the remote transmitter may be acceptable. Removal of the barriers for intrinsic safety isolation is permitted for non-intrinsically safe electrode installations.
• Bundled cables from other equipment in a single conduit are likely to create interference and noise in the system. See Figure 5-1.
• Electrode cables should not be run together in the same cable tray with power cables.
• Output cables should not be run together with power cables.
• Select conduit size appropriate to feed cables through to the flowmeter.

Figure 5-1: Best practice conduit preparation

The diagram illustrates best practices for conduit preparation, showing connections for safety ground (A), power (B), coil (C), output (D), and electrode (E) to the transmitter.

5.3 Sensor to transmitter wiring

Wiring details

Cable kits are available as individual component cables or as a combination coil/electrode cable. Remote cables can be ordered directly using the kit numbers shown in Table 5-1, Table 5-2, and Table 5-3. Equivalent Alpha cable part numbers are also provided as an alternative. To order cable, specify length as quantity desired. Equal length of component cables is required.

Examples:

• 25 feet = Qty (25) 08732-0065-0001
• 25 meters = Qty (25) 08732-0065-0002

Cable requirements

Shielded twisted pairs or triads must be used. For installations using the individual coil drive and electrode cable, see Figure 5-2. Cable lengths should be limited to less than 500 feet (152 m). Consult factory for length between 500–1000 feet (152–304 m). Equal length cable is required for each. For installations using the combination coil drive/electrode cable, see Figure 5-3. Combination cable lengths should be limited to less than 330 feet (100 m).

Figure 5-2: Individual component cables

This diagram illustrates the construction of individual component cables. Diagram A shows the Coil drive cable with conductors Red (1), Blue (2), and Drain (3). Diagram B shows the Electrode cable with conductors Yellow (18), White (19), and Drain (17). Labels E and F describe the cable's overlapping foil shield and outer jacket.

Figure 5-3: Combination coil and electrode cable

This diagram shows the construction of the combination coil and electrode cable. Labels A, B, and C describe the Electrode shield drain, Overlapping foil shield, and Outer jacket, respectively. The conductors are identified by color and number: Red (1), Blue (2), Drain (3), Black (17), Yellow (18), and White (19).

Cable preparation

Prepare the ends of the coil drive and electrode cables as shown in Figure 5-4. Remove only enough insulation so that the exposed conductor fits completely under the terminal connection. Best practice is to limit the unshielded length (D) of each conductor to less than one inch. Excessive removal of insulation may result in an unwanted electrical short to the transmitter housing or other terminal connections. Excessive unshielded length, or failure to connect cable shields properly, may also expose the unit to electrical noise, resulting in an unstable meter reading.

Figure 5-4: Cable ends

This diagram shows prepared cable ends for Coil (A), Electrode (B), and Combination (C) cables, highlighting the unshielded length (D).

⚠️ WARNING! Shock hazard! Potential shock hazard across remote junction box terminals 1 and 2 (40V).

⚠️ WARNING! Explosion hazard! Electrodes exposed to process. Use only compatible transmitter and approved installation practices. For process temperatures greater than 284°F (140°C), use a wire rated for 257°F (125°C).

Remote junction box terminal blocks

Figure 5-5: Remote junction box views

The diagram shows the remote junction box views, illustrating connections between the Sensor (A) and the Transmitter (B).

Note: For hazardous locations, refer to the product reference manual.

5.4 Wiring diagrams

Figure 5-6: Wiring 8712EM using component cable

This diagram illustrates the wiring of the Rosemount 8712EM transmitter using component cables, showing connections from sensor to transmitter.

Figure 5-7: Wiring 8712EM using combination cable

This diagram illustrates the wiring of the Rosemount 8712EM transmitter using combination cables, showing connections from sensor to transmitter.

5.5 Power and I/O terminal blocks

Open the bottom cover of the transmitter to access the terminal block.

Note: To connect pulse output and/or discrete input/output, and for installations with intrinsically safe outputs, refer to the product reference manual.

Figure 5-8: 8712EM Terminal blocks

The diagram shows the 8712EM Terminal blocks layout.

(1) Note Polarity: Internally Powered, Terminal 7 (–) Analog HART, Terminal 8 (+) Analog HART. Externally Powered, Terminal 7 (+) Analog HART, Terminal 8 (–) Analog HART

(2) Only available with ordering code AX.

5.6 Powering the transmitter

The transmitter is available in three models. The AC powered transmitter is designed to be powered by 90–250VAC (50/60Hz). The DC powered transmitter is designed to be powered by 12–42VDC. The low power transmitter is designed to be powered by 12-30VDC. Before connecting power to the transmitter, be sure to have the proper power supply, conduit, and other accessories. Wire the transmitter according to national, local, and plant electrical requirements for the supply voltage.

If installing in a hazardous location, verify that the meter has the appropriate hazardous area approval. Each meter has a hazardous area approval tag attached to the side of the transmitter housing.

AC power supply requirements

Units powered by 90 - 250VAC have the following power requirements. Peak inrush is 35.7A at 250VAC supply, lasting approximately 1ms. Inrush for other supply voltages can be estimated with: Inrush (Amps) = Supply (Volts) / 7.0

Figure 5-9: AC current requirements

This graph shows the relationship between Supply Current (amps) on the Y-axis and Power Supply (VAC) on the X-axis.

Apparent power

Figure 5-10: Apparent power

This graph shows Apparent Power (VA) on the Y-axis versus Power Supply (VAC) on the X-axis.

DC power supply requirements

Standard DC units powered by 12VDC power supply may draw up to 1.2A of current steady state. Low power DC units may draw up to 0.25A of current steady state. Peak inrush is 42A at 42VDC supply, lasting approximately 1ms. Inrush for other supply voltages can be estimated with: Inrush (Amps) = Supply (Volts) / 1.0

Figure 5-11: DC current requirements

This graph shows the Supply Current (amps) on the Y-axis versus Power Supply (VDC) on the X-axis for standard DC units.

Figure 5-12: Low power DC current requirements

This graph shows the Supply Current (amps) on the Y-axis versus Power Supply (VDC) on the X-axis for low power DC units.

Supply wire requirements

Use 10–18 AWG wire rated for the proper temperature of the application. For wire 10–14 AWG use lugs or other appropriate connectors. For connections in ambient temperatures above 122 °F (50 °C), use a wire rated for 194 °F (90 °C). For DC powered transmitters with extended cable lengths, verify that there is a minimum of 12VDC at the terminals of the transmitter with the device under load.

Electrical disconnect requirements

Connect the device through an external disconnect or circuit breaker per national and local electrical code.

Installation category

The installation category for the transmitter is OVERVOLTAGE CAT II.

Overcurrent protection

The transmitter requires overcurrent protection of the supply lines. Fuse rating and compatible fuses are shown in Table 5-6.

Power terminals

For AC powered transmitter (90–250VAC, 50/60 Hz):

• Connect AC Neutral to Terminal N and AC Line to Terminal L1.

For DC powered transmitter:

• Connect negative to Terminal N and positive to Terminal L1.
• DC powered units may draw up to 1.2A.

Covers

Use the transmitter lower door screw to secure the terminal compartment after the instrument has been wired and powered up. Follow these steps to ensure the housing is properly sealed to meet ingress protection requirements:

1. Ensure all wiring is complete and close the lower door.
2. Tighten the lower door screw until the lower door is tight against the housing. Metal to metal contact of the screw bosses is required to ensure a proper seal.

Note: Application of excessive torque may strip the threads or break the screw.

3. Verify the lower door is secure.

5.7 Analog output

The analog output signal is a 4-20mA current loop. Depending on the IS output option, the loop can be powered internally or externally via a hardware switch located on the front of the electronics stack. The switch is set to internal power when shipped from the factory. Intrinsically safe analog output requires a shielded twisted pair cable. For HART communication, a minimum resistance of 250 ohms is required. It is recommended to use individually shielded twisted pair cable. The minimum conductor size is 24 AWG (0.51mm) diameter for cable runs less than 5,000 feet (1,500m) and 20 AWG (0.81mm) diameter for longer distances.

Note: For more information about the analog output characteristics, refer to the product reference manual.

Internal Power

Figure 5-13: Analog output wiring, internal power

The diagram shows the internal power wiring for the 4-20mA analog output. It indicates connecting the negative signal (A) to Terminal #7 and the positive signal (B) to Terminal #8.

Note: Terminal polarity for the analog output is reversed between internally and externally powered.

External power

Figure 5-14: Analog output wiring, external power

The diagram shows the external power wiring for the 4-20mA analog output. It shows connecting the positive power supply (A) to Terminal #7 and the negative power supply to Terminal #8.

Note: Terminal polarity for the analog output is reversed between internally and externally powered.

Figure 5-15: Analog loop load limitations

This graph illustrates the analog loop load limitations. The Y-axis shows Load (ohms), and the X-axis shows Power supply (volts). The operating region (C) is defined by the formulas:

• Rmax = 31.25 (Vps–10.8)
• Vps = power supply voltage (volts)
• Rmax = maximum loop resistance (ohms)

6 Basic Configuration

Once the magnetic flowmeter is installed and power has been supplied, the transmitter must be configured through the basic setup. These parameters can be configured through either an LOI or a HART communication device. Configuration settings are saved in nonvolatile memory within the transmitter. Descriptions of more advanced functions are included in the product reference manual.

6.1 Basic Setup

Tag

Tag is the quickest and shortest way of identifying and distinguishing between transmitters. Transmitters can be tagged according to the requirements of your application. The tag may be up to eight characters long as standard, or 32 characters long when ordered with HART 7.

Flow units (PV)

The flow units variable specifies the format in which the flow rate will be displayed. Units should be selected to meet your particular metering needs.

Line size

The line size (sensor size) must be set to match the actual sensor connected to the transmitter. The size must be specified in inches.

Upper range value (URV)

The URV sets the 20 mA point for the analog output. This value is typically set to full-scale flow. The units that appear will be the same as those selected under the flow units parameter. The URV may be set between –39.3 ft/s to 39.3 ft/s (–12 m/s to 12m/s). There must be at least 1 ft/s (0.3 m/s) span between the URV and LRV.

Lower range value (LRV)

The LRV sets the 4 mA point for the analog output. This value is typically set to zero flow. The units that appear will be the same as those selected under the flow units parameter. The LRV may be set between –39.3 ft/s to 39.3 ft/s (–12 m/s to 12m/s). There must be at least 1 ft/s (0.3 m/s) span between the URV and LRV.

Calibration number

The sensor calibration number is a 16-digit number generated at the factory during flow calibration, is unique to each sensor, and is located on the sensor tag.

6.2 Local operator interface (LOI)

To access the transmitter menu, press the XMTR MENU key. Use the UP, DOWN, LEFT(E), and RIGHT arrows to navigate the menu structure. A complete map of the LOI menu structure is shown in the product reference manual.

The display can be locked to prevent unintentional configuration changes. The display lock can be activated through a HART communication device, or by holding the UP arrow for three seconds and then following the on-screen instructions.

When the display lock is activated, a lock symbol will appear in the lower right hand corner of the display. To deactivate the display lock, hold the UP arrow for three seconds and follow the on-screen instructions. Once deactivated, the lock symbol will no longer appear in the lower right hand corner of the display.

6.3 Field Communicator interface

Use the menu paths to configure basic setup of the transmitter using a field communicator.

Contact Information

Emerson Automation Solutions USA
7070 Winchester Circle
Boulder, Colorado USA 80301
T +1 303-527-5200
T +1 800-522-6277
F +1 303-530-8459
www.emerson.com

Emerson Automation Solutions Europe
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6718 WX Ede
The Netherlands
T +31 (0) 70 413 6666
F +31 (0) 318 495 556
www.micromotion.nl

Emerson Automation Solutions Asia
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Singapore 128461
Republic of Singapore
T +65 6777-8211
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Emerson Automation Solutions Japan
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Shinagawa-ku
Tokyo 140-0002 Japan
T +81 3 5769-6803
F +81 3 5769-6844

Emerson Automation Solutions United Kingdom
Emerson Process Management Limited
Horsfield Way
Bredbury Industrial Estate
Stockport SK6 2SU U.K.
T +44 0870 240 1978
F +44 0800 966 181

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