Rosemount 8782 Transmitter Manuals & Guides

Supplemental Guide

00825-1100-8782, Rev AB

December 2020

Replacing a Rosemount™ 8712H
Transmitter with a Rosemount 8782
Transmitter

Wiring to an existing Rosemount 8707
sensor

Supplemental Guide December 2020

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.

• Potential electrostatic charging hazard: Rosemount Magnetic flow

meters 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 flow meter 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 8782 Transmitter to a non-Rosemount

sensor.

• 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.

• Shock hazard: Shut off power before servicing. Do not operate without

power compartment cover.

2 Replacing a Rosemount™ 8712H transmitter with a Rosemount 8782 transmitter

December 2020 Supplemental Guide

CAUTION

• The sensor liner is vulnerable to handling damage. Liner damage can

render the sensor useless. Failure to observe these instructions could
result in severe damage to the sensor lining and possible sensor
replacement.

• To avoid possible damage to the sensor liner ends:
— Do not use metallic or spiral-wound gaskets. If spiral wound or

metallic gaskets are required for the application, lining protectors
must be used.

— If frequent removal is anticipated, attach short spool pieces to the

sensor ends.

— Tighten bolts in the proper sequence to the specified torque limits.

Correct flange bolt tightening is crucial for proper sensor operation
and life.

• 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.

Supplemental Guide 3

Supplemental Guide December 2020

2 Introduction

This document provides specific instructions for replacing a Rosemount
8712H transmitter with a Rosemount 8782 Magnetic Slurry wall-mount
transmitter, when used with a Rosemount 8707 sensor only.

• For additional transmitter installation information, configuration,

maintenance, and troubleshooting, refer to the Rosemount™ 8782

Magnetic Slurry Flow Meter with HART Protocol Reference Manual

• For sensor installation refer to the Rosemount™ 8700 Series Magnetic

Flowmeter Sensors Reference Manual

All user documentation can be found at www.emerson.com. For more
contact information see Emerson Flow customer service.

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.

4 Replacing a Rosemount™ 8712H transmitter with a Rosemount 8782 transmitter

December 2020 Supplemental Guide

2.2 Emerson Flow customer service

Email:

• Worldwide: [e-mail]

• Asia-Pacific: [e-mail]

Telephone:

North and South America Europe and Middle East Asia Pacific

United States 800 522 6277 U.K. 0870 240

Canada +1 303 527

5200

Mexico +41 (0) 41

7686 111

Argentina [phone]

7000

Brazil [phone]

8000

Venezuela [phone]

3446

The
Netherlands

France 0800 917 901 India 800 440 1468

Germany 0800 182

Italy 8008 77334 China [phone]

Central &
Eastern
Europe

Russia/CIS +7 495 995

Egypt 0800 000

Oman 800 70101 Thailand 001 800 441

Qatar 431 0044 Malaysia 800 814 008

Kuwait 663 299 01

South Africa 800 991 390

Saudi Arabia 800 844 9564

UAE 800 0444

1978

+31 (0) 704
136 666

5347

+41 (0) 41
7686 111

9559

0015

0684

Australia 800 158 727

New Zealand 099 128 804

Pakistan 888 550 2682

9000

Japan +81 3 5769

6803

South Korea +82 2 3438

4600

Singapore +65 6 777

8211

6426

Supplemental Guide 5

Supplemental Guide December 2020

3 Replacement

Review the entire transmitter Quick Start Guide that was shipped with the
transmitter. If you do not have the Quick Start Guide, contact an Emerson
Flow representative (see back page) before performing this procedure.

1. Put the loop in manual control and record the current flow rate on
the existing transmitter.

The recorded value will be necessary to calculate the meter factor
(correction) for the new transmitter. If the existing transmitter is
inoperable, you will need to run the process at a known flow rate to
calculate the meter factor during configuration.

2. Power down the existing 8712H transmitter.

3. Label and remove each wire connected to the existing transmitter
terminals with the number from the terminal from which it was
removed. For the Analog Output wires connected to Terminal #7 and
#8, include the polarity, either negative or positive, on the labels.

4. Remove the blade connectors from the wires, and prepare the wires
for use with the screw terminals on the new transmitter.

The same wiring that was used to wire the existing transmitter can be
used to wire the new transmitter. No new wiring is required. The
wires can be minimally stripped or prepared with spade terminals as
desired. If replacing any cabling, ensure the electrode cabling
includes a separate drain wire for optimum noise mitigation.

5. Complete the removal of the cables and connectors so they are
completely free of the existing transmitter housing.

6. Physically remove the existing transmitter and replace it with the
new transmitter. The new transmitter can use the same mounting
method as the existing transmitter without modification.

7. Run the cables with the prepared wires through the appropriate
conduit openings on the new transmitter.

8. Connect the sensor to transmitter wires to the same numbered
terminals to which they were connected on the existing transmitter
(Terminals #1, #2, #17, #18, and #19); the coil ground (drain) wire
from the existing transmitter is connected to Terminal #3 on the new
transmitter. Terminal locations and identification are shown in Figure

3-1.

6 Replacing a Rosemount™ 8712H transmitter with a Rosemount 8782 transmitter

5 6 7 8 17 18 19

L1

1 2

N

9 10 16 20

A

B

December 2020 Supplemental Guide

Figure 3-1: Compared Rosemount 8712H and 8782 terminal
configurations

A. Rosemount 8712H terminal configuration
B. Rosemount 8782 terminal configuration

9. Connect any Input/Output wires to the same-labeled terminals to
which they were connected on the existing transmitter, with one
likely exception for the Analog Output wires.

For the Analog Output wires, pay special attention to the polarity of
the terminals, because it may be different between the 8712H and

8782. For the 8712H, Terminal #7 was positive (+) and Terminal #8
was negative (–). The polarity of the Analog Output terminals for the
8782 is dependent on the power source type, which is determined by
a hardware switch. See Table 3-1 for the Analog Output terminal
polarity.

Supplemental Guide 7

Supplemental Guide December 2020

Table 3-1: 8782 terminal assignment by Analog Output power
source type

Power source Terminal #7 Terminal #8

Internal 4–20 mA negative (–) 4–20 mA positive (+)

External 4–20 mA positive (+) 4–20 mA negative (–)

10. Verify that power to the transmitter is still disconnected, and then
connect the power supply wires to the same labeled terminals to
which they were connected on the existing transmitter.

Important

Do not connect the power supply ground wire to Terminal #3;
connect it to the earth ground terminal screw in the upper left corner
of the terminal compartment.

11. Seal the conduit in accordance with local and plant electrical codes.

12. Close terminal compartment, tightening the cover screw until a tight
metal-to-metal contact is obtained.

13. If the 8782 is DC powered (8782AW2xxxxx) and is replacing an
8712H with F0227, ensure the power going to the 8782 is 12–
24V DC.

14. Power on the transmitter and verify that there are no errors or fault
messages.

8 Replacing a Rosemount™ 8712H transmitter with a Rosemount 8782 transmitter

December 2020 Supplemental Guide

4 Configuration

Review the entire transmitter Quick Start Guide that was shipped with the
transmitter. If you do not have the Quick Start Guide, contact an Emerson
Flow representative (see back page) before performing this procedure.

Basic configuration

Complete the basic setup as described in the transmitter Quick Start Guide,
to configure the Calibration number, flow units (PV), Line size, URV, and LRV.

Advanced configuration

Advanced Configuration enhances the performance of the 8782 when
paired with a legacy sensor. Perform the Advanced Configuration steps to
get the most out of the 8782 without an MS sensor. Review the transmitter
product reference manual, which is available online (see back page), for
more information about advanced transmitter configuration.

1. If possible, perform an Auto Zero Trim. The flow must be stopped
and the pipe full.

2. Restart the flow at the same known, stable flow rate that was used
when the flow rate was recorded prior to removing the 8712H
transmitter.

3. If the 8782 transmitter is reading a different flow rate than the
8712H, calculate the Meter Factor to correct the 8782. Use one of
the following methods:

• With the process moving at the same flow rate as earlier, when

the flow rate was recorded, divide the recorded rate by the
current flow rate being reported by the new transmitter.

• With the process moving at a known flow rate, divide the known

flow rate by the current flow rate being reported by the new
transmitter.

The resulting Meter Factor must be a number between 0.2000 and

1.8000, with most Meter Factors for this application being between

0.9500 to 0.9999. For example, if the recorded flow rate from the
8712H was 100 GPM, and the current flow rate reading on the 8782
is 102 GPM, the meter factor is 100 / 102 = 0.9804.

4. Enter the calculated Meter Factor into the transmitter. The menu
path is Detailed Setup → More Params → Meter Factor. With the
Meter Factor applied, the measured flow rate should match the
known flow rate.

5. If the measured flow rate does not acceptably match the known flow
rate, verify the calculation and entry of the Meter Factor, and repeat
if necessary.

Supplemental Guide 9

Supplemental Guide December 2020

5 Product Certifications

For detailed approval certification information and installation drawings,
please see the appropriate document listed below:

• Document number 00825-MA00-0009: Rosemount 8782 and MS

Approval Document - Class Division

• Document number 00825-MA00-0010: Rosemount 8782 and MS

Approval Document - IECEx and ATEX

• Document number 00825-MA00-0011: Rosemount 8782 and MS

Approval Document - North America Zone

• Document number 00825-MA00-0012: Rosemount 8785 Approval

Document

• Document number 00825-MA00-0013: Rosemount 8782 and MS

Approval Document - EAC EX

10 Replacing a Rosemount™ 8712H transmitter with a Rosemount 8782 transmitter

December 2020 Supplemental Guide

Supplemental Guide 11

*00825-1100-8782*

Supplemental Guide

00825-1100-8782, Rev. AB

December 2020

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