Rosemount 8712EM Protocol Reference Manual

Reference manual

00809-0100-4445, Rev AA December 2017

Rosemount® 8712EM Transmitter with HART Protocol Reference Manual

Contents

Contents

Chapter 1	Safety messages ............................................................................................................		1
Chapter 2	Introduction ..................................................................................................................		5
	2.1	System description ......................................................................................................................	5
	2.2	Product recycling/disposal ...........................................................................................................	7
Chapter 3	Sensor Installation .........................................................................................................		9
	3.1	Handling and Lifting Safety ..........................................................................................................	9
	3.2	Location and Position ................................................................................................................	10
	3.3	Sensor Installation .....................................................................................................................	12
	3.4	Process reference connection ....................................................................................................	20
Chapter 4	Remote Transmitter Installation ..................................................................................		25
	4.1	Pre-installation ..........................................................................................................................	25
	4.2	Transmitter symbols ..................................................................................................................	28
	4.3	Mounting ..................................................................................................................................	29
	4.4	Wiring .......................................................................................................................................	30
Chapter 5	Basic Configuration ......................................................................................................		47
	5.1	Basic Setup ................................................................................................................................	47
	5.2	Local operator interface (LOI) ....................................................................................................	48
	5.3	Field Communicator interface ...................................................................................................	48
	5.4	Measurement units ...................................................................................................................	49
Chapter 6	Advanced installation details .......................................................................................		51
	6.1	Hardware switches ....................................................................................................................	51
	6.2	Additional loops ........................................................................................................................	53
	6.3	Coil housing configuration .........................................................................................................	64
Chapter 7	Operation ....................................................................................................................		71
	7.1	Introduction ..............................................................................................................................	71
	7.2	Local operator interface (LOI) ....................................................................................................	71
	7.3	Field Communicator interface ...................................................................................................	80
Chapter 8	Advanced Configuration Functionality .........................................................................		85
	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
Chapter 9	Advanced Diagnostics Configuration ..........................................................................		109
	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

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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

Chapter 10 Digital Signal Processing ............................................................................................		131
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

Chapter 11 Maintenance ..............................................................................................................		139
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

Chapter 12 Troubleshooting ........................................................................................................		149
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

Appendix A	Product Specifications ................................................................................................		177
	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
Appendix B	Product Certifications ................................................................................................		205
Appendix C	Wiring Diagrams ........................................................................................................		207
	C.1	Wiring diagrams ......................................................................................................................	208
	C.2	775 Smart Wireless THUM™ Adapter wiring diagrams ..............................................................	210
	C.3	Field Communicator wiring diagrams ......................................................................................	212
Appendix D	Implementing a Universal Transmitter .......................................................................		215
	D.1	Safety messages ......................................................................................................................	215

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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

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Safety messages

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.

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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 nonmetallic 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 nonmetallic 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.

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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.

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Safety messages

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Introduction

2 Introduction

Topics covered in this chapter:

•System description

•Product recycling/disposal

2.1System 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.

Figure 2-1: Wall mount transmitter

There are three Rosemount® flow sensors available.(1)

Figure 2-2: 8705 flanged sensor

(1) Also available for use with 8707 High Signal sensor with dual calibration (option code D2).

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Introduction

Figure 2-3: 8711 wafer sensor

Figure 2-4: 8721 hygienic sensor

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.

Figure 2-5: 8705 Cross Section

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Introduction

2.2Product recycling/disposal

Recycling of equipment and packaging should be taken into consideration and disposed of in accordance with local and national legislation/regulations.

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Introduction

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Sensor Installation

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

3.1Handling 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.

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Sensor Installation

3.2Location and Position

3.2.1Environmental 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.

3.2.2Upstream 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.

Figure 3-1: Upstream and downstream straight pipe diameters

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.

3.2.3Flow direction

The sensor should be mounted so that the arrow points in the direction of flow.

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Sensor Installation

Figure 3-2: Flow direction arrow

3.2.4Sensor 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.

Figure 3-3: Sensor orientation

A.Flow direction

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3.2.5Electrode 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.

Figure 3-4: Electrode orientation

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.

3.3Sensor Installation

3.3.1Flanged 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.

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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.

Figure 3-5: Gasket placement for flanged sensors

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.

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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.

Figure 3-6: Flange bolt torquing sequence

Prior to installation, identify the lining material of the flow sensor to ensure the suggested torque values are applied.

Table 3-1: Lining material

Fluoropolymer liners	Other liners
T - PTFE	P - Polyurethane
F - ETFE	N - Neoprene
A - PFA	L - Linatex (Natural Rubber)
K - PFA+	D - Adiprene

Table 3-2: Suggested flange bolt torque values for Rosemount 8705 (ASME)

		Fluoropolymer liners		Other liners
Size		Class 150	Class 300	Class 150	Class 300
Code	Line Size	(pound-feet)	(pound-feet)	(pound-feet)	(pound feet)
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

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	Table 3-2: Suggested flange bolt torque values for Rosemount 8705 (ASME)
	(continued)
			Fluoropolymer liners		Other liners
	Size		Class 150	Class 300	Class 150	Class 300
	Code	Line Size	(pound-feet)	(pound-feet)	(pound-feet)	(pound feet)
	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

Table 3-3: Suggested flange bolt torque values for Rosemount 8705 sensors with fluoropolymer liners (EN 1092-1)

Size		Fluoropolymer liners (in Newton-meters)
code	Line size	PN 10	PN 16	PN 25	PN 40
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

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Table 3-3: Suggested flange bolt torque values for Rosemount 8705 sensors with fluoropolymer liners (EN 1092-1) (continued)

Size		Fluoropolymer liners (in Newton-meters)
code	Line size	PN 10	PN 16	PN 25	PN 40
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 non-fluoropolymer liners (EN 1092-1)

Size		Non-fluoropolymer liners (in Newton-meters)
Code	Line Size	PN 10	PN 16	PN 25	PN 40
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

3.3.2Wafer sensors

When installing wafer sensors, there are several components that must be included and requirements that must be met.

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Figure 3-7: Wafer sensors installation components and assembly requirements

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

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.

Table 3-5: Rosemount alignment spacers

	Line size
Dash-no. (-xxxx)	(in)	(mm)	Flange rating
0A15	1.5	40	JIS 10K-20K
0A20	2	50	JIS 10K-20K
0A30	3	80	JIS 10K

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Sensor Installation

Table 3-5: Rosemount alignment spacers (continued)

	Line size
Dash-no. (-xxxx)	(in)	(mm)	Flange rating
0B15	1.5	40	JIS 40K
AA15	1.5	40	ASME150#
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

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.

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		Sensor Installation
	Table 3-6: Stud specifications
	Nominal sensor size	Stud specifications
	0.15–1-in. (4–25 mm)	316 SST ASTM A193, Grade B8M, Class 1 threa-
		ded mounted studs
	1½–8-in. (40–200 mm)	CS, ASTM A193, Grade B7, threaded mounting
		studs

Figure 3-8: Flange bolt torquing sequence

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.

Table 3-7: Rosemount 8711 torque specifications

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

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Table 3-7: Rosemount 8711 torque specifications (continued)

Size code	Line size	Pound-feet	Newton-meter
080	8-in. (200 mm)	70	95

3.3.3Sanitary 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.

Figure 3-9: Sanitary sensor gasket and clamp alignment

A.User supplied clamp

B.User supplied gasket

3.4Process 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.

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Use the Process reference options table to determine which process reference option to follow for proper installation.

Table 3-8: Process reference options

	Grounding		Reference elec-	Lining protec-
Type of pipe	straps	Grounding rings	trode	tors
Conductive un-	See Figure 3-10	See Figure 3-11	See Figure 3-13	See Figure 3-11
lined pipe
Conductive lined	Insufficient	See Figure 3-11	See Figure 3-10	See Figure 3-11
pipe	grounding
Non-conductive	Insufficient	See Figure 3-12	Not recommen-	See Figure 3-12
pipe	grounding		ded

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: Grounding straps in conductive unlined pipe or reference electrode in lined pipe

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Figure 3-11: Grounding with grounding rings or lining protectors in conductive pipe

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

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Sensor Installation

Figure 3-13: Grounding with reference electrode in conductive unlined pipe

Figure 3-14: Grounding for line sizes 10-in. and larger

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24	Rosemount® 8712EM Transmitter with HART Protocol Reference Manual