How it Works
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8712
Operating Manual
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Installation Guide
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Data sheet
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Table of contents
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Rosemount 8712 Operating Manual

Reference manual
00809-0100-4445, Rev AA
December 2017
Rosemount® 8712EM Transmitter with HART Protocol Reference Manual

Contents

Contents
2.1 System description ...................................................................................................................... 5
2.2 Product recycling/disposal ...........................................................................................................7
3.1 Handling and Lifting Safety ..........................................................................................................9
3.2 Location and Position ................................................................................................................ 10
3.3 Sensor Installation ..................................................................................................................... 12
3.4 Process reference connection ....................................................................................................20
4.1 Pre-installation .......................................................................................................................... 25
4.2 Transmitter symbols ..................................................................................................................28
4.3 Mounting .................................................................................................................................. 29
4.4 Wiring ....................................................................................................................................... 30
5.1 Basic Setup ................................................................................................................................ 47
5.2 Local operator interface (LOI) .................................................................................................... 48
5.3 Field Communicator interface ................................................................................................... 48
5.4 Measurement units ................................................................................................................... 49
6.1 Hardware switches .................................................................................................................... 51
6.2 Additional loops ........................................................................................................................ 53
6.3 Coil housing configuration .........................................................................................................64
7.1 Introduction .............................................................................................................................. 71
7.2 Local operator interface (LOI) .................................................................................................... 71
7.3 Field Communicator interface ................................................................................................... 80
8.1 Introduction .............................................................................................................................. 85
8.2 Configure outputs ..................................................................................................................... 85
8.3 Configure HART .......................................................................................................................100
8.4 Configure LOI .......................................................................................................................... 104
8.5 Additional parameters .............................................................................................................105
8.6 Configure special units ............................................................................................................ 106
9.1 Introduction ............................................................................................................................ 109
9.2 Licensing and enabling ............................................................................................................ 110
9.3 Tunable empty pipe detection .................................................................................................111
9.4 Electronics temperature .......................................................................................................... 113
9.5 Ground/wiring fault detection ................................................................................................. 113
9.6 High process noise detection ...................................................................................................114
9.7 Coated electrode detection .....................................................................................................115
9.8 4-20 mA loop verification ........................................................................................................ 117
Contents
9.9 SMART™ Meter Verification ......................................................................................................118
9.10 Run manual SMART Meter Verification .................................................................................... 121
9.11 Continuous SMART Meter Verification .....................................................................................122
9.12 SMART Meter Verification test results ......................................................................................123
9.13 SMART Meter Verification measurements ............................................................................... 125
9.14 Optimizing the SMART Meter Verification ............................................................................... 127
10.1 Introduction ............................................................................................................................ 131
10.2 Safety messages ......................................................................................................................131
10.3 Process noise profiles .............................................................................................................. 132
10.4 High process noise diagnostic ..................................................................................................133
10.5 Optimizing flow reading in noisy applications ..........................................................................133
10.6 Explanation of signal processing algorithm ..............................................................................136
11.1 Introduction ............................................................................................................................ 139
11.2 Safety information ...................................................................................................................139
11.3 Installing a local operator interface (LOI) ................................................................................. 140
11.4 Replacing electronics stack ......................................................................................................141
11.5 Replacing a terminal block socket module ...............................................................................142
11.6 Replacing a terminal block with amp clips ............................................................................... 143
11.7 Trims ....................................................................................................................................... 144
12.1 Introduction ............................................................................................................................ 149
12.2 Safety information ...................................................................................................................150
12.3 Installation check and guide .................................................................................................... 150
12.4 Diagnostic messages ...............................................................................................................152
12.5 Basic troubleshooting ..............................................................................................................162
12.6 Sensor troubleshooting ........................................................................................................... 166
12.7 Installed sensor tests ............................................................................................................... 170
12.8 Uninstalled sensor tests ...........................................................................................................172
12.9 Technical support ....................................................................................................................174
12.10 Service .....................................................................................................................................175
Appendices and reference
A.1 Rosemount 8700M Flowmeter Platform specifications ........................................................... 177
A.2 Transmitter specifications ....................................................................................................... 182
A.3 8705-M Flanged Sensor Specifications .....................................................................................191
A.4 8711-M/L Wafer Sensor Specifications .....................................................................................196
A.5 8721 Hygienic (Sanitary) Sensor Specifications ........................................................................199
C.1 Wiring diagrams ...................................................................................................................... 208
C.2 775 Smart Wireless THUM™ Adapter wiring diagrams ..............................................................210
C.3 Field Communicator wiring diagrams ...................................................................................... 212
D.1 Safety messages ......................................................................................................................215
ii Rosemount® 8712EM Transmitter with HART Protocol Reference Manual
Contents
D.2 Universal capability ..................................................................................................................216
D.3 Three step process ...................................................................................................................216
D.4 Wiring the universal transmitter .............................................................................................. 217
D.5 Rosemount sensors ................................................................................................................. 217
D.6 Brooks sensors .........................................................................................................................221
D.7 Endress and Hauser sensors .....................................................................................................223
D.8 Fischer and Porter sensors ....................................................................................................... 224
D.9 Foxboro sensors ...................................................................................................................... 231
D.10 Kent Veriflux VTC sensor ..........................................................................................................235
D.11 Kent sensors ............................................................................................................................237
D.12 Krohne sensors ........................................................................................................................238
D.13 Taylor sensors ..........................................................................................................................239
D.14 Yamatake Honeywell sensors .................................................................................................. 241
D.15 Yokogawa sensors ...................................................................................................................242
D.16 Generic manufacturer sensor to 8712 Transmitter .................................................................. 244
Reference manual iii
Contents
iv Rosemount® 8712EM Transmitter with HART Protocol Reference Manual
1 Safety messages
WARNING!
General hazards. Failure to follow these instructions could result in death or serious injury.
• 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.
• 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 the installation is completed safely and is consistent with the operating
environment.
• Do not substitute factory components with non-factory compenents. Substitution of
components may impair Intrinsic Safety.
• Do not perform any services other than those contained in this manual.
• Process leaks may result in death or serious injury.
• Mishandling products exposed to a hazardous substance may result in death or serious
injury.
• The electrode compartment may contain line pressure; it must be depressurized before
the cover is removed.
• 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 products described in this document are NOT designed for nuclear-qualified
applications. Using non-nuclear qualified products in applications that require nuclear­qualified hardware or products may cause inaccurate readings. For information on Rosemount nuclear-qualified products, contact your local Emerson Process Management Sales Representative.

Safety messages

Reference manual 1
Safety messages
WARNING!
Explosion hazards. Failure to follow these instructions could cause an explosion, resulting in death or serious injury.
• If installed in explosive atmospheres [hazardous areas, classified areas, or an “Ex”
environment], it must be assured that the device certification and installation techniques are suitable for that particular environment.
• Do not remove transmitter covers in explosive atmospheres when the circuit is live.
Both transmitter covers must be fully engaged to meet explosion-proof requirements.
• Do not disconnect equipment when a flammable or combustible atmosphere is present.
• 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 non­incendive field wiring practices.
• Do not connect a Rosemount transmitter to a non-Rosemount sensor that is located in
an explosive atmosphere. The transmitter has not been evaluated for use with other manufacturers' magnetic flowmeter sensors in hazardous (Ex or Classified) areas. Special care should be taken by the end-user and installer to ensure the transmitter meets the safety and performance requirements of the other manufacturer’s equipment.
• 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.
• 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.
WARNING!
Electrical hazards. Failure to follow these instructions could cause damaging and unsafe discharge of electricity, resulting in death or serious injury.
• 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.
• Disconnect power before servicing circuits.
• Allow ten minutes for charge to dissipate prior to removing electronics compartment
cover. The electronics may store energy in this period immediately after power is removed.
• Avoid contact with leads and terminals. High voltage that may be present on leads could
cause electrical shock.
• 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.
2 Rosemount® 8712EM Transmitter with HART Protocol Reference Manual
Safety messages
NOTICE
Damage hazards. Failure to follow these instructions could resulting damage or destruction of equipment.
• The sensor liner is vulnerable to handling damage. Never place anything through the
sensor for the purpose of lifting or gaining leverage. Liner damage may render the sensor inoperable.
• Metallic or spiral-wound gaskets should not be used as they will damage the liner face of
the sensor. If spiral wound or metallic gaskets are required for the application, lining protectors must be used. 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 specifications. Failure to observe these instructions could result in severe damage to the sensor lining and possible sensor replacement.
• In cases where high voltage/high current are present near the meter installation, ensure
proper protection methods are followed to prevent stray electricity 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.
• Do not connect mains or line power to the magnetic flowtube sensor or to the
transmitter coil excitation circuit.
Reference manual 3
Safety messages
4 Rosemount® 8712EM Transmitter with HART Protocol Reference Manual
2 Introduction
Topics covered in this chapter:

System description

•
Product recycling/disposal
•
2.1 System description
The 8700M Magnetic Flowmeter Platform consists of a sensor and a transmitter. The sensor is installed in-line with the process piping; the transmitter is remotely mounted to the sensor.
Wall mount transmitterFigure 2-1:

Introduction

There are three Rosemount® flow sensors available.
8705 flanged sensorFigure 2-2:
(1) Also available for use with 8707 High Signal sensor with dual calibration (option code D2).
(1)
Reference manual 5
Introduction
8711 wafer sensorFigure 2-3:
8721 hygienic sensorFigure 2-4:
The flow sensor contains two magnetic coils located on opposite sides of the sensor. Two electrodes, located perpendicular to the coils and opposite each other, make contact with the liquid. The transmitter energizes the coils and creates a magnetic field. A conductive liquid moving through the magnetic field generates an induced voltage at the electrodes. This voltage is proportional to the flow velocity. The transmitter converts the voltage detected by the electrodes into a flow reading. A cross-sectional view is show in Figure 2-5.
8705 Cross SectionFigure 2-5:
6 Rosemount® 8712EM Transmitter with HART Protocol Reference Manual

2.2 Product recycling/disposal

Recycling of equipment and packaging should be taken into consideration and disposed of in accordance with local and national legislation/regulations.
Introduction
Reference manual 7
Introduction
8 Rosemount® 8712EM Transmitter with HART Protocol Reference Manual
3 Sensor Installation
Topics covered in this chapter:

Handling and Lifting Safety

•
Location and Position
•

Sensor Installation

•
Process reference connection
•
This chapter provides instructions for handling and installing the flow sensor with a remotely mounted transmitter.
Related information
Remote Transmitter Installation
Sensor Installation
3.1 Handling and Lifting Safety
CAUTION!
To reduce the risk of personal injury or damage to equipment, follow all lifting and handling instructions.
• Handle all parts carefully to prevent damage. Whenever possible, transport the system
to the installation site in the original shipping container.
• PTFE-lined sensors are shipped with end covers that protect it from both mechanical
damage and normal unrestrained distortion. Remove the end covers just before installation.
• Keep the shipping plugs in the conduit ports until you are ready to connect and seal
them. Appropriate care should be taken to prevent water ingress.
• The sensor should be supported by the pipeline. Pipe supports are recommended on
both the inlet and outlet sides of the sensor pipeline. There should be no additional support attached to the sensor.
• Use proper PPE (Personal Protection Equipment) including safety glasses and steel toed
shoes.
• Do not lift the meter by holding the electronics housing or junction box.
• 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.
• Do not drop the device from any height.
Reference manual 9
Sensor Installation

3.2 Location and Position

3.2.1 Environmental considerations

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

3.2.2 Upstream and downstream piping

To ensure specified accuracy over widely varying process conditions, install the sensor with a minimum of five straight pipe diameters upstream and two pipe diameters downstream from the electrode plane.
3.2.3
Upstream and downstream straight pipe diametersFigure 3-1:
A. Five pipe diameters (upstream) B. Two pipe diameters (downstream) C. Flow direction
Installations with reduced upstream and downstream straight runs are possible. In reduced straight run installations, the meter may not meet absolute accuracy specifications. Reported flow rates will still be highly repeatable.

Flow direction

The sensor should be mounted so that the arrow points in the direction of flow.
10 Rosemount® 8712EM Transmitter with HART Protocol Reference Manual
Flow direction arrowFigure 3-2:

3.2.4 Sensor piping location and orientation

The sensor should be installed in a location that ensures it remains full during operation. Depending on where it is installed, orientation must also be considered.
• Vertical installation with upward process fluid flow keeps the cross-sectional area
full, regardless of flow rate.
• Horizontal installation should be restricted to low piping sections that are normally
full.
Sensor Installation
Sensor orientationFigure 3-3:
A. Flow direction
Reference manual 11

Sensor Installation

3.2.5 Electrode orientation
The electrodes in the sensor are properly oriented when the two measurement electrodes are in the 3 and 9 o’clock positions or within 45 degrees from the horizontal, as shown on the left side of Figure 3-4. Avoid any mounting orientation that positions the top of the sensor at 90 degrees from the vertical position as shown on the right of the Electrode Orientation figure.

Electrode orientationFigure 3-4:

A. Correct orientation B. Incorrect orientation
The sensor may require a specific orientation to comply with Hazardous Area T-code rating. Refer to the approrpirate reference manual for any potential restrictions.
3.3
Sensor Installation

3.3.1 Flanged sensors

Gaskets
The sensor requires a gasket at each process connection. The gasket material must be compatible with the process fluid and operating conditions. Gaskets are required on each side of a grounding ring (see Figure 3-5). All other applications (including sensors with lining protectors or a grounding electrode) require only one gasket on each process connection.
12 Rosemount® 8712EM Transmitter with HART Protocol Reference Manual
Sensor Installation
Note
Metallic or spiral-wound gaskets should not be used as they will damage the liner face of the sensor. If spiral wound or metallic gaskets are required for the application, lining protectors must be used.
Gasket placement for flanged sensorsFigure 3-5:
A. Grounding ring and gasket (optional) B. Customer-supplied gasket
Bolts
Note
Do not bolt one side at a time. Tighten both sides simultaneously. Example:
1. Snug upstream
2. Snug downstream
3. Tighten upstream
4. Tighten downstream
Do not snug and tighten the upstream side and then snug and tighten the downstream side. Failure to alternate between the upstream and downstream flanges when tightening bolts may result in liner damage.
Suggested torque values by sensor line size and liner type are listed in Table 3-2 for ASME B16.5 flanges and Table 3-3 or Table 3-4 for EN flanges. Consult the factory if the flange rating of the sensor is not listed. Tighten flange bolts on the upstream side of the sensor in the incremental sequence shown in Figure 3-6 to 20% of the suggested torque values. Repeat the process on the downstream side of the sensor. For sensors with greater or fewer flange bolts, tighten the bolts in a similar crosswise sequence. Repeat this entire tightening sequence at 40%, 60%, 80%, and 100% of the suggested torque values.
Reference manual 13
Sensor Installation
If leakage occurs at the suggested torque values, the bolts can be tightened in additional 10% increments until the joint stops leaking, or until the measured torque value reaches the maximum torque value of the bolts. Practical consideration for the integrity of the liner often leads to distinct torque values to stop leakage due to the unique combinations of flanges, bolts, gaskets, and sensor liner material.
Check for leaks at the flanges after tightening the bolts. Failure to use the correct tightening methods can result in severe damage. While under pressure, sensor materials may deform over time and require a second tightening 24 hours after the initial installation.
Flange bolt torquing sequenceFigure 3-6:
Prior to installation, identify the lining material of the flow sensor to ensure the suggested torque values are applied.
Lining materialTable 3-1:
Fluoropolymer liners Other liners
T - PTFE P - Polyurethane
F - ETFE N - Neoprene
A - PFA L - Linatex (Natural Rubber)
K - PFA+ D - Adiprene
Suggested flange bolt torque values for Rosemount 8705 (ASME)Table 3-2:
Fluoropolymer liners Other liners
Size Code Line Size
005 0.5-in. (15 mm) 8 8 N/A N /A
010 1-in. (25 mm) 8 12 6 10
015 1.5-in. (40 mm) 13 25 7 18
020 2-in. (50 mm) 19 17 14 11
Class 150 (pound-feet)
Class 300 (pound-feet)
Class 150 (pound-feet)
Class 300 (pound feet)
14 Rosemount® 8712EM Transmitter with HART Protocol Reference Manual
Sensor Installation
Table 3-2:
(continued)
Size Code Line Size
025 2.5-in. (65 mm) 22 24 17 16
030 3-in. (80 mm) 34 35 23 23
040 4-in. (100 mm) 26 50 17 32
050 5-in. (125 mm) 36 60 25 35
060 6-in. (150 mm) 45 50 30 37
080 8-in. (200 mm) 60 82 42 55
100 10-in. (250 mm) 55 80 40 70
120 12-in. (300 mm) 65 125 55 105
140 14-in. (350 mm) 85 110 70 95
160 16-in. (400 mm) 85 160 65 140
180 18-in. (450 mm) 120 170 95 150
200 20-in. (500 mm) 110 175 90 150
240 24-in. (600 mm) 165 280 140 250
300 30-in. (750 mm) 195 415 165 375
360 36-in. (900 mm) 280 575 245 525
Suggested flange bolt torque values for Rosemount 8705 (ASME)
Fluoropolymer liners Other liners
Class 150 (pound-feet)
Class 300 (pound-feet)
Class 150 (pound-feet)
Class 300 (pound feet)
Table 3-3:
Suggested flange bolt torque values for Rosemount 8705 sensors with
fluoropolymer liners (EN 1092-1)
Size code Line size
005 0.5-in. (15 mm) N/A N/A N/A 10
010 1-in. (25 mm) N/A N/A N/A 20
015 1.5-in. (40 mm) N/A N/A N/A 50
020 2-in. (50 mm) N/A N/A N/A 60
025 2.5-in. (65 mm) N/A N/A N/A 50
030 3-in. (80 mm) N/A N/A N/A 50
040 4-in. (100 mm) N/A 50 N/A 70
050 5.0-in. (125 mm) N/A 70 N/A 100
060 6-in. (150mm) N/A 90 N/A 130
080 8-in. (200 mm) 130 90 130 170
100 10-in. (250 mm) 100 130 190 250
120 12-in. (300 mm) 120 170 190 270
Fluoropolymer liners (in Newton-meters)
PN 10 PN 16 PN 25 PN 40
Reference manual 15
Sensor Installation
Table 3-3:
Suggested flange bolt torque values for Rosemount 8705 sensors with
fluoropolymer liners (EN 1092-1) (continued)
Size code Line size
140 14-in. (350 mm) 160 220 320 410
160 16-in. (400 mm) 220 280 410 610
180 18-in. (450 mm) 190 340 330 420
200 20-in. (500 mm) 230 380 440 520
240 24-in. (600 mm) 290 570 590 850
Table 3-4:
Suggested flange bolt torque values for Rosemount 8705 sensors with
Fluoropolymer liners (in Newton-meters)
PN 10 PN 16 PN 25 PN 40
non-fluoropolymer liners (EN 1092-1)
Size Code Line Size
005 0.5-in. (15 mm) N/A N/A N/A 20
010 1-in. (25 mm) N/A N/A N/A 30
015 1.5-in. (40 mm) N/A N/A N/A 40
020 2-in. (50 mm) N/A N/A N/A 30
025 2.5-in. (65 mm) N/A N/A N/A 35
030 3-in. (80 mm) N/A N/A N/A 30
040 4-in. (100 mm) N/A 40 N/A 50
050 5.0-in. (125 mm) N/A 50 N/A 70
060 6-in. (150mm) N/A 60 N/A 90
080 8-in. (200 mm) 90 60 90 110
100 10-in. (250 mm) 70 80 130 170
120 12-in. (300 mm) 80 110 130 180
140 14-in. (350 mm) 110 150 210 288
160 16-in. (400 mm) 150 190 280 410
180 18-in. (450 mm) 130 230 220 280
200 20-in. (500 mm) 150 260 300 350
240 24-in. (600 mm) 200 380 390 560
Non-fluoropolymer liners (in Newton-meters)
PN 10 PN 16 PN 25 PN 40

3.3.2 Wafer sensors

When installing wafer sensors, there are several components that must be included and requirements that must be met.
16 Rosemount® 8712EM Transmitter with HART Protocol Reference Manual
Wafer sensors installation components and assembly requirementsFigure 3-7:
A. Ground ring (optional) B. Customer supplied gaskets C. Spacer installation (horizontal meters) D. Spacer installation (vertical meters) E. O-ring F. Installation studs, nuts, and washers (optional) G. Wafer alignment spacer H. Flow
Sensor Installation
Gaskets
The sensor requires a gasket at each process connection. The gasket material selected must be compatible with the process fluid and operating conditions. Gaskets are required on each side of a grounding ring. See Figure 3-7.
Note
Metallic or spiral-wound gaskets should not be used as they will damage the liner face of the sensor.
Alignment spacers
On 1.5 inch through 8 inch (40 through 200 mm) line sizes, Rosemount requires installing the alignment spacers to ensure proper centering of the wafer sensor between the process flanges. To order an Alignment Spacer Kit (quantity 3 spacers) use p/n 08711-3211-xxxx where xxxx equals the dash number shown in Table 3-5.
Rosemount alignment spacersTable 3-5:
Line size
Dash-no. (-xxxx)
0A15 1.5 40 JIS 10K-20K
0A20 2 50 JIS 10K-20K
0A30 3 80 JIS 10K
Flange rating(in) (mm)
Reference manual 17
Sensor Installation
Rosemount alignment spacers (continued)Table 3-5:
Line size
Dash-no. (-xxxx)
0B15 1.5 40 JIS 40K
AA15 1.5 40 ASME- 150#
AA20 2 50 ASME - 150#
AA30 3 80 ASME - 150#
AA40 4 100 ASME - 150#
AA60 6 150 ASME - 150#
AA80 8 200 ASME - 150#
AB15 1.5 40 ASME - 300#
AB20 2 50 ASME - 300#
AB30 3 80 ASME - 300#
AB40 4 100 ASME - 300#
AB60 6 150 ASME - 300#
AB80 8 200 ASME - 300#
DB40 4 100 EN 1092-1 - PN10/16
DB60 6 150 EN 1092-1 - PN10/16
DB80 8 200 EN 1092-1 - PN10/16
DC80 8 200 EN 1092-1 - PN25
DD15 1.5 40 EN 1092-1 - PN10/16/25/40
DD20 2 50 EN 1092-1 - PN10/16/25/40
DD30 3 80 EN 1092-1 - PN10/16/25/40
DD40 4 100 EN 1092-1 - PN25/40
DD60 6 150 EN 1092-1 - PN25/40
DD80 8 200 EN 1092-1 - PN40
RA80 8 200 AS40871-PN16
RC20 2 50 AS40871-PN21/35
RC30 3 80 AS40871-PN21/35
RC40 4 100 AS40871-PN21/35
RC60 6 150 AS40871-PN21/35
RC80 8 200 AS40871-PN21/35
Flange rating(in) (mm)
Studs
Wafer sensors require threaded studs. See Figure 3-8 for torque sequence. Always check for leaks at the flanges after tightening the flange bolts. All sensors require a second tightening 24 hours after initial flange bolt tightening.
18 Rosemount® 8712EM Transmitter with HART Protocol Reference Manual
Sensor Installation
Stud specificationsTable 3-6:
Nominal sensor size Stud specifications
0.15–1-in. (4–25 mm) 316 SST ASTM A193, Grade B8M, Class 1 threa­ded mounted studs
1½–8-in. (40–200 mm) CS, ASTM A193, Grade B7, threaded mounting
studs
Flange bolt torquing sequenceFigure 3-8:
Installation
1. Insert studs for the the bottom side of the sensor between the pipe flanges and center the alignment spacer in the middle of the stud. See Figure 3-7 for the bolt hole locations recommended for the spacers provided. Stud specifications are listed in Table 3-6.
2. Place the sensor between the flanges. Make sure the alignment spacers are properly centered on the studs. For vertical flow installations slide the o-ring over the stud to keep the spacer in place. See Figure 3-7. Ensure the spacers match the flange size and class rating for the process flanges. See Table 3-5.
3. Insert the remaining studs, washers, and nuts.
4. Tighten to the torque specifications shown in Table 3-7. Do not over-tighten the bolts or the liner may be damaged.
Rosemount 8711 torque specificationsTable 3-7:
Size code Line size Pound-feet Newton-meter
015 1.5-in. (40 mm) 15 20
020 2-in. (50 mm) 25 34
030 3-in. (80 mm) 40 54
040 4-in. (100 mm) 30 41
060 6-in. (150 mm) 50 68
Reference manual 19
Sensor Installation
Rosemount 8711 torque specifications (continued)Table 3-7:
Size code Line size Pound-feet Newton-meter
080 8-in. (200 mm) 70 95

3.3.3 Sanitary senors

Gaskets
The sensor requires a gasket at each of its connections to adjacent devices or piping. The gasket material selected must be compatible with the process fluid and operating conditions.
Note
Gaskets are supplied between the IDF fitting and the process connection fitting, such as a Tri-Clamp fitting, on all Rosemount 8721 Sanitary sensors except when the process connection fittings are not supplied and the only connection type is an IDF fitting.
Alignment and bolting
Standard plant practices should be followed when installing a magmeter with sanitary fittings. Unique torque values and bolting techniques are not required.
Sanitary sensor gasket and clamp alignmentFigure 3-9:
A. User supplied clamp B. User supplied gasket
3.4
20 Rosemount® 8712EM Transmitter with HART Protocol Reference Manual

Process reference connection

The figures shown in this chapter illustrate process reference connections only. Earth safety ground is also required as part of this installation, but is not shown in the figures. Follow national, local, and plant electrical codes for safety ground.
Sensor Installation
Use the Process reference options table to determine which process reference option to follow for proper installation.
Process reference optionsTable 3-8:
Grounding
Type of pipe
Conductive un­lined pipe
Conductive lined pipe
Non-conductive pipe
Note
For line sizes 10-inch and larger the ground strap may come attached to the sensor body near the flange. See Figure 3-14.
Figure 3-10:
straps Grounding rings
See Figure 3-10 See Figure 3-11 See Figure 3-13 See Figure 3-11
Insufficient grounding
Insufficient grounding
See Figure 3-11 See Figure 3-10 See Figure 3-11
See Figure 3-12 Not recommen-
Grounding straps in conductive unlined pipe or reference electrode in
Reference elec­trode
ded
Lining protec­tors
See Figure 3-12
lined pipe
Reference manual 21
Sensor Installation
Grounding with grounding rings or lining protectors in conductive pipeFigure 3-11:
A. Grounding rings or lining protectors
Figure 3-12:
Grounding with grounding rings or lining protectors in non-conductive pipe
A. Grounding rings or lining protectors
22 Rosemount® 8712EM Transmitter with HART Protocol Reference Manual
Sensor Installation
Grounding with reference electrode in conductive unlined pipeFigure 3-13:
Grounding for line sizes 10-in. and largerFigure 3-14:
Reference manual 23
Sensor Installation
24 Rosemount® 8712EM Transmitter with HART Protocol Reference Manual
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