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
Emerso nProcess.co m/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 ins tallation 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
Handling and lifting . . . . . . . . . . . . . . . . . . . . 8
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Sensor installation . . . . . . . . . . . . . . . . . . . . . 11
Process reference connection . . . . . . . . . . . 16
2
Wiring the transmitter . . . . . . . . . . . . . . . . . . . . . . 18
Basic configuration . . . . . . . . . . . . . . . . . . . . . . . . . 31
Product Certifications . . . . . . . . . . . . . . . . . . . . . . 36
Installation and wiring drawings . . . . . . . . . . . . . . 48
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.
1.1 Identify options and configurations
The typical installation of the Rosemount 8750W includes a device power
connection, a 4
connections. Other applications may require one or more of the following
configurations or options:
Pulse output
Discrete input/discrete output
HART
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
configuration for these switches when shipped from the factory are as follows:
Table 1. Standard Switch Configuration
–20mA output connection, and sensor coil and electrode
®
Multidrop Configuration
(1)
, and Transmitter security. The standard
Setting Standard switch configuration
Alarm mode High
Internal/external analog power Internal
Internal/external pulse power
Transmitter security Off
(1)
External
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
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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4
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7.49
(189,8)
6.48
(164,6)
1.94
(49,3)
A
B
C
A
D
5.77
(146,4)
7.64
(194,0)
8.86
(225,1)
3.07
(78,0)
2.22
(56,4)
3.00
(76,2)
5.00
(127,0)
10.29
(261,3)
2.81
(71,4)
5.00
(127,0)
1.80
(45,7)
10.18
(258,6)
5.82
(147,8)
Figure 1. Rosemount 8750W Field Mount Transmitter
Quick Start Guide
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
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Quick Start Guide
A
B
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Figure 3. Rosemount 8750W Wall Mount Transmitter with Standard Cover
4.31
(109)
2.96
(75)
A. Ground lug
1
B.
/2-in.–14 NPT or M20 conduit entry
Dimensions in inches (millimeters).
9.01
(229)
2.81
(71)
3.11
(79)
0.44
12.02
(305)
11.15
(283)
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
Pulsed circuit
4-20mA output circuit
Coil excitation output 500mA, 40V max, 9W max
Wall mount transmitter
Power input
Pulsed circuit Externally powered (Passive): 5–24VDC, up to 2W
4-20mA output circuit
Coil excitation output 500mA, 40V max, 9W max
(1)
Sensor
Coil excitation input 500mA, 40V max, 20W max
Electrode circuit 5V, 200uA, 1mW
90–250VAC, 0.45A, 40VA
12–42VDC, 1.2A, 15W
Internally powered (Active): Outputs up to 12VDC, 12.1mA, 73mW
Externally powered (Passive): Input up to 28VDC, 100mA, 1W
Internally Powered (Active): Outputs up to 25mA, 24VDC, 600mW
Externally Powered (Passive): Input up to 25mA, 30VDC, 750mW
90–250VAC, 0.28A, 40VA
12–42VDC, 1A, 15W
Internally powered (Active): Outputs up to 25mA, 30VDC
Externally powered (Passive): Input up to 25mA, 10–30VDC
1. Provided by the transmitter.
1.4 Environmental 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
2.0 Handling 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.
March 2016
Figure 5. Support for Handling and Lifting
Without lifting lugs
8
With lifting lugs
March 2016
Quick Start Guide
3.0 Mounting
3.1 Upstream/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.
9
Quick Start Guide
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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Quick Start Guide
4.0 Sensor installation
4.1 Gaskets
The sensor requires a gasket at each process connection. The gasket material must be
compatible with the process fluid and operating conditions. G askets 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
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.
™
Process Management representative if the flange rating of the
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
Table 3. Lining Material
Quick Start Guide
Fluoropolymer liners
T - PTFE
Resilient liners
P - Polyurethane
N - Neoprene
Table 4. Flange Bolt Torque and Load Specifications for 8750W (ASME)
Size
code
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
Line size
Fluoropolymer liners Resilient liners
Class 150
(pound-feet)
Class 300
(pound-feet)
Class 150
(pound-feet)
Class 300
(pound-feet)
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Quick Start Guide
Table 5. Flange Bolt Torque and Load Specifications for 8750W (EN 1092-1)
March 2016
Size
code
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
code
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
Line size
Line size
PN10
(Newton-meter)
PN 10
(Newton-meter)
Fluoropolymer liners
PN 16
(Newton-meter)
Resilient liners
PN 16
(Newton-meter)
PN 25
(Newton-meter)
PN 25
(Newton-meter)
PN 40
(Newton-meter)
PN 40
(Newton-meter)
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March 2016
Quick Start Guide
Table 6. Flange Bolt Torque and Load Specifications for Rosemount 8750W
Larger Line Sizes (AWWA C207)
Size
code
300 30-in. (750 mm) 195 195 195
360 36-in. (900 mm) 280 280 280
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
Line size
Class D
(pound-feet)
Fluoropolymer liners
Class E
(pound-feet)
Resilient liners
Class F
(pound-feet)
Table 7. Flange Bolt Torque and Load Specifications for Rosemount 8750W
Larger Line Sizes (EN 1092-1)
Size
code
360 36-in. (900 mm) N/A 264 264
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
Line size
PN6
(Newton-meter)
Fluoropolymer liners
PN10
(Newton-meter)
Resilient liners
PN16
(Newton-meter)
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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
Conductive unlined
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.
See Figure 12 See Figure 13
Note
For line sizes 10-in. and larger, the ground strap may come attached to the sensor body near the
flange. See Figure 16.
(1)
Reference electrode
See Figure 15
(1)
Figure 12. Grounding Straps in Conductive Unlined Pipe or Reference
Electrode in Lined Pipe
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