Rosemount 8750W Installation Guide

Quick Start Guide

00825-0300-4750, Rev CA

March 2016

Rosemount™ 8750W Magnetic Flowmeter System

for Utility, Water, and Wastewater Applications

Quick Start Guide	March 2016

NOTICE

This document provides basic installation guidelines for the Rosemount 8750W Magnetic Flowmeter Platform. For comprehensive instructions for detailed configuration, diagnostics, maintenance, service, installation, or troubleshooting refer to the Rosemount 8750W Reference Manual (document number 00809-0300-4750). The manual and Quick Start Guide are also available electronically on EmersonProcess.com/Rosemount.

Failure to follow these installation guidelines could result in death or serious injury.

Installation and servicing instructions are for use by qualified personnel only. Do not perform any servicing other than that contained in the operating instructions, unless qualified.

Verify the installation is done safely and is consistent with the operating environment.

Ensure the device certification and installation techniques are suitable for the installation environment.

Explosion hazard. Do not disconnect equipment when a flammable or combustible atmosphere is present.

To prevent ignition of flammable or combustible atmospheres, disconnect power before servicing circuits.

Do not connect a Rosemount 8750W Transmitter to a non-Rosemount sensor that is located in an explosive atmosphere.

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.

NOTICE

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 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 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.

Contents

Transmitter installation . . . . . . . . . . . . . . . .	. 3	Wiring the transmitter . . . . . . . . . . . . . . . . . . . . . .	18
Handling and lifting . . . . . . . . . . . . . . . . . . . .	8	Basic configuration . . . . . . . . . . . . . . . . . . . . . . . . .	31
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9	Product Certifications . . . . . . . . . . . . . . . . . . . . . .	36
Sensor installation . . . . . . . . . . . . . . . . . . . . .	11	Installation and wiring drawings . . . . . . . . . . . . . .	48
Process reference connection . . . . . . . . . . .	16

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March 2016

Quick Start Guide

1.0 Transmitter installation

Installation of the Rosemount Magnetic Flowmeter Transmitter includes both detailed mechanical and electrical installation procedures.

Before installing the Rosemount 8750W, there are several pre-installation steps that should be completed to make the installation process easier:

Identify the options and configurations that apply to your application.

Set the hardware switches if necessary.

Consider mechanical, electrical, and environmental requirements.

1.1Identify options and configurations

The typical installation of the Rosemount 8750W 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 Rosemount 8750W electronics stack is equipped with user-selectable hardware switches. These switches set the Alarm mode, Internal/external analog power, Internal/external pulse power(1), and Transmitter security. The standard configuration for these switches when shipped from the factory are as follows:

Table 1. Standard Switch Configuration

Setting	Standard switch configuration
Alarm mode	High
Internal/external analog power	Internal
Internal/external pulse power(1)	External
Transmitter security	Off

In most cases, it will not be necessary to change the setting of the hardware switches. If the switch settings need to be changed, follow the steps outlined in the “Changing hardware switch settings” section of the Rosemount 8750W Reference Manual.

NOTICE

To prevent switch damage, use a non-metallic tool to move switch positions.

Be sure to identify any additional options and configurations that apply to the installation. Keep a list of these options for consideration during the installation and configuration procedures.

1. Rosemount 8750W Field Mount Transmitter only.

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Quick Start Guide	March 2016

1.2 Mechanical considerations

The mounting site for the Rosemount 8750W should provide enough room for secure mounting, easy access to conduit entries, full opening of the transmitter covers, and easy readability of the LOI screen if equipped.

For remote field mount transmitter installations, a mounting bracket is provided for use on a 2-in. pipe or a flat surface (see Figure 1).

NOTICE

If the transmitter is mounted separately from the sensor, it may not be subject to limitations that might apply to the sensor.

Rotate integral mount transmitter housing

The transmitter housing can be rotated on the sensor in 90° increments by removing the four mounting screws on the bottom of the housing. Do not rotate the housing more than 180° in any one direction. Prior to tightening, be sure the mating surfaces are clean, the O-ring is seated in the groove, and there is no gap between the housing and the sensor.

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March 2016		Quick Start Guide

Figure 1. Rosemount 8750W Field Mount Transmitter

	7.49
	(189,8)
	6.48
	(164,6)
	1.94		A
	(49,3)		B
5.00	3.00		D
(127,0)	(76,2)
			8.86
			(225,1)
10.29
(261,3)
2.81		2.22	3.07
(71,4)
			(78,0)
		(56,4)
C		1.80	A
		(45,7)
	5.00
	(127,0)
	10.18
	(258,6)

5.77

(146,4)

7.64

(194,0)

A.1/2-in.–14 NPT conduit entry

B.LOI cover

C.2-in. pipe bracket

D.Ground lug

Dimensions are in inches (millimeters).

Figure 2. Rosemount 8750W Integral Field Mount Transmitter

5.82

(147,8)

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Quick Start Guide	March 2016

Figure 3. Rosemount 8750W Wall Mount Transmitter with Standard Cover

4.31	9.01
	(229)
(109)
	2.81	3.11	0.44
	(71)	(79)
			12.02
			(305)
			11.15
			(283)
			A	B
2.96
(75)

A.Ground lug

B.1/2-in.–14 NPT or M20 conduit entry

Dimensions in inches (millimeters).

Figure 4. Rosemount 8750W Wall Mount Transmitter with LOI Cover

A

A. LOI keypad cover

NOTICE

Default conduit entries are 1/2-in. NPT. If an alternate thread connection is required, thread adapters must be used.

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March 2016	Quick Start Guide

1.3 Electrical considerations

Before making any electrical connections to the Rosemount 8750W, 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.

Both remotely and integrally mounted transmitters require external power so there must be access to a suitable power source.

Table 2. Electrical Data

Field mount transmitter

	Power input	90–250VAC, 0.45A, 40VA
		12–42VDC, 1.2A, 15W
	Pulsed circuit	Internally powered (Active): Outputs up to 12VDC, 12.1mA, 73mW
		Externally powered (Passive): Input up to 28VDC, 100mA, 1W
	4-20mA output circuit	Internally Powered (Active): Outputs up to 25mA, 24VDC, 600mW
		Externally Powered (Passive): Input up to 25mA, 30VDC, 750mW
	Coil excitation output	500mA, 40V max, 9W max
	Wall mount transmitter
	Power input	90–250VAC, 0.28A, 40VA
		12–42VDC, 1A, 15W
	Pulsed circuit	Externally powered (Passive): 5–24VDC, up to 2W
	4-20mA output circuit	Internally powered (Active): Outputs up to 25mA, 30VDC
		Externally powered (Passive): Input up to 25mA, 10–30VDC
	Coil excitation output	500mA, 40V max, 9W max
	Sensor(1)
	Coil excitation input	500mA, 40V max, 20W max
	Electrode circuit	5V, 200uA, 1mW

1.Provided by the transmitter.

1.4Environmental considerations

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

high-vibration lines with integrally mounted transmitters

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.

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Quick Start Guide	March 2016

2.0Handling and lifting

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 connections until you are ready to connect and seal them.

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.

Additional safety recommendations for mechanical handling:

-Use proper PPE (Personal Protection Equipment should include safety glasses and steel toed shoes).

-Do not drop the device from any height.

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.

If provided, use the lifting lugs on each flange to handle the Magnetic Flowmeter when it is transported and lowered into place at the installation site. If lifting lugs are not provided, the Magnetic Flowmeter must be supported with a lifting sling on each side of the housing.

Flanged sensors 3-in. through 48-in. come with lifting lugs.

Wafer sensors do not come with lifting lugs.

Figure 5. Support for Handling and Lifting

Without lifting lugs

With lifting lugs

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March 2016

Quick Start Guide

3.0Mounting

3.1Upstream/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 (see Figure 6).

Figure 6. Upstream and Downstream Straight Pipe Diameters

A.Five pipe diameters

B.Two pipe diameters

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 Flow direction

The sensor should be mounted so the arrow points in the direction of flow. See Figure 7.

Figure 7. Flow Direction Arrow

3.3 Sensor location

The sensor should be installed in a location that ensures it remains full during operation. 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.

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Quick Start Guide	March 2016

Figure 8. Sensor Orientation

3.4 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° from the horizontal, as shown on the left of Figure 9. Avoid any mounting orientation that positions the top of the sensor at 90° from the vertical position as shown on the right of Figure 9.

Figure 9. Mounting Position

Correct

Incorrect

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March 2016

Quick Start Guide

4.0Sensor installation

4.1Gaskets

The sensor requires a gasket ateach process connection. The gasketmaterial must be compatible with the processfluid and operating conditions. Gaskets are required on each side of a grounding ring (see Figure 10). All other applications (including sensors or a grounding electrode) require only one gasket on each process connection.

NOTICE

Metallic or spiral-wound gaskets should not be used as they will damage the liner face of the sensor.

Figure 10. Flanged Gasket Placement

A.Grounding ring and gasket (optional)

B.Customer-supplied gasket

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Quick Start Guide	March 2016

4.2 Flange 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 4 for ASME B16.5 flanges, Table 5 for EN flanges, and Table 6 and Table 7 for AWWA and EN flanges for line sizes 30-in. (750 mm) to 48-in. (1300 mm). Consult your local Emerson™ Process Management representative 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 11 to 20 percent of the suggested torque values. Repeat the process on the downstream side of the sensor. For sensors with more or less 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.

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 the user 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 11. Flange Bolt Torquing Sequence

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

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March 2016			Quick Start Guide
	Table 3. Lining Material
	Fluoropolymer liners	Resilient liners
	T - PTFE	P - Polyurethane
		N - Neoprene

Table 4. Flange Bolt Torque and Load Specifications for 8750W (ASME)

	Size		Fluoropolymer liners		Resilient liners
		Line size
	code		Class 150	Class 300	Class 150	Class 300
			(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	N/A	N/A
	015	1.5-in. (40 mm)	13	25	7	18
	020	2-in. (50 mm)	19	17	14	11
	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

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Quick Start Guide	March 2016

Table 5. Flange Bolt Torque and Load Specifications for 8750W (EN 1092-1)

	Size			Fluoropolymer liners
	code	Line size	PN10	PN 16	PN 25	PN 40
			(Newton-meter)	(Newton-meter)	(Newton-meter)	(Newton-meter)
	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-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
	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
	Size			Resilient liners
		Line size
	code		PN 10	PN 16	PN 25	PN 40
			(Newton-meter)	(Newton-meter)	(Newton-meter)	(Newton-meter)
	010	1-in. (25 mm)	N/A	N/A	N/A	20
	015	1.5-in. (40 mm)	N/A	N/A	N/A	30
	020	2-in. (50 mm)	N/A	N/A	N/A	40
	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-in. (125 mm)	N/A	50	N/A	70
	060	6-in. (150 mm)	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	280
	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

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Table 6. Flange Bolt Torque and Load Specifications for Rosemount 8750W Larger Line Sizes (AWWA C207)

	Size			Fluoropolymer liners
		Line size
	code		Class D	Class E	Class F
			(pound-feet)	(pound-feet)	(pound-feet)
	300	30-in. (750 mm)	195	195	195
	360	36-in. (900 mm)	280	280	280
				Resilient liners
	300	30-in. (750 mm)	165	165	165
	360	36-in. (900 mm)	245	245	245
	400	40-in. (1000 mm)	757	757	N/A
	420	42-in. (1050 mm)	839	839	N/A
	480	48-in. (1200 mm)	872	872	N/A

Table 7. Flange Bolt Torque and Load Specifications for Rosemount 8750W Larger Line Sizes (EN 1092-1)

	Size			Fluoropolymer liners
		Line size
	code		PN6	PN10	PN16
			(Newton-meter)	(Newton-meter)	(Newton-meter)
	360	36-in. (900 mm)	N/A	264	264
				Resilient liners
	360	36-in. (900 mm)	N/A	264	264
	400	40-in. (1000 mm)	208	413	478
	480	48-in. (1200 mm)	375	622	N/A

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Quick Start Guide	March 2016

5.0 Process reference connection

Figure 12 through Figure 15 illustrate process reference connections only. Earth safety ground is also required as part of the installation but is not shown in the figures. Follow national, local, and plant electrical codes for safety ground.

Use Table 8 to determine which process reference option to follow for proper installation.

Table 8. Process reference installation

Process reference options

	Type of pipe	Grounding straps	Grounding rings	Reference electrode
	Conductive unlined	See Figure 12	See Figure 13(1)	See Figure 15(1)
	pipe
	Conductive lined pipe	Insufficient grounding	See Figure 13	See Figure 12
	Non-conductive pipe	Insufficient grounding	See Figure 14	Not recommended

1.Grounding ring and reference electrode are not required for process reference. Grounding straps per Figure 12 are sufficient.

Note

For line sizes 10-in. and larger, the ground strap may come attached to the sensor body near the flange. See Figure 16.

Figure 12. Grounding Straps in Conductive Unlined Pipe or Reference Electrode in Lined Pipe

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