Emerson Rosemount 8750WB User manual

Quick Start Guide
00825-0200-4750, Rev AA
February 2014
Rosemount 8750WB Magnetic Flowmeter
System
for Utility, Water, and Wastewater Applications

February 2014
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Quick Start Guide
NOTICE
This document provides basic installation guidelines for the Rosemount® 8750W Magnetic
Flowmeter System. For comprehensive instructions, for detailed configuration, diagnostics,
maintenance, service, installation or troubleshooting, refer to the Rosemount 8750W
reference manual (document number 00809-0100-4750 Rev. BA). The manual and this QSG
are also available electronically on www.rosemount.com.
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 that the operating environment of the sensor and transmitter is consistent with the
operating environment.
Do not connect a Rosemount transmitter to a non-Rosemount sensor that is located in an
explosive atmosphere.
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.
Rosemount Magnetic Flowmeters ordered with non-standard paint options 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.
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.
Contents
Pre-installation . . . . . . . . . . . . . .page 3
Handling . . . . . . . . . . . . . . . . . . .page 7
Mounting . . . . . . . . . . . . . . . . . .page 8
Installation . . . . . . . . . . . . . . . .page 10
Grounding . . . . . . . . . . . . . . . .page 15
Wiring . . . . . . . . . . . . . . . . . . . .page 17
Basic configuration . . . . . . . . .page 28

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Step 1: Pre-installation
Before installing the Rosemount 8750W Flowmeter, 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
Mechanical considerations
The mounting site for the Rosemount 8750W transmitter should provide enough
room for secure mounting, easy access to conduit ports, full opening of the
transmitter covers, and easy readability of the LOI screen (see Figure 1 and
Figure 2).
If the Rosemount 8750W transmitter is mounted separately from the sensor, it
may not be subject to the same limitations that apply to the sensor.
Figure 1. Field mount transmitter dimensional drawing
NOTICE
*Non- standard conduit entry thread. M20 connections are available with the use of threaded
conduit adapters.
5.82
(148)
6.48 (165)
7.49 (190)
LOI Cover
4.97
(126)
8.81
(224)
3.00
(76)
3.07
(78)
4.97
(126)
1/2”-14 NPT (3 places)*
1/2”-14 NPT (2 places)*

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Figure 2. Wall mount transmitter dimensional drawing
4.31
(109)
LOI Keypad
Cover
9.01
(229)
11.15
(283)
2.81
(71)
3.11
(79)
12.02
(305)
0.44
(11)
Ground Lug
1/2–14 NPT
Conduit
Connection
(4 Places)
WITH STANDARD COVER
NOTE
Dimensions are in inches (millimeters)
2.96
(75)
WITH LOI COVER

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Environmental considerations
To ensure maximum transmitter life, avoid extreme temperature and excessive
vibration. Typical problem areas:
high-vibration lines with integrally mounted transmitters
warm-climate installations in direct sunlight
outdoor installations in cold climates.
Remote-mounted transmitters may be installed in the control room to protect
the electronics from the harsh environment and provide easy access for
configuration or service.
Both remotely and integrally mounted Rosemount 8750W transmitters require
external power so there must be access to a suitable power source.
Installation procedures
Rosemount 8750W installation includes both detailed mechanical and electrical
installation procedures.
Mount the transmitter
At a remote site the transmitter may be mounted on a pipe up to two inches in
diameter or against a flat surface.
Pipe mounting
To mount the transmitter on a pipe:
1. Attach the mounting bracket to the pipe using the mounting hardware.
2. Attach the Rosemount 8750W transmitter to the mounting bracket using the
mounting screws.
Identify options and configurations
The standard application of the 8750W includes a 4–20 mA output and control of
the sensor coils and electrodes. Other applications may require one or more of
the following configurations or options:
HART Multidrop Configuration
Discrete Output
Discrete Input
Pulse Output
Be sure to identify any additional options and configurations that apply to the
installation. Keep a list of these options nearby for consideration during the
installation and configuration procedures.

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Quick Start Guide
Hardware jumpers/switches
The 8750W electronics board is equipped with user-selectable hardware switches
depending on the transmitter model ordered. These switches set the Failure
Alarm Mode, Internal/External Analog Power, Internal/External Pulse Power and
Transmitter Security. The standard configuration for these switches when
shipped from the factory is as follows:
Changing hardware switch settings
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 manual.
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.
Rotate transmitter housing
The Field Mount transmitter housing can be rotated on the sensor in 90°
increments by removing the four mounting bolts 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.
Failure Alarm Mode: HIGH
Internal/External Analog Power: INTERNAL
Internal/External Pulse Power: EXTERNAL (Field Mount only)
Transmitter Security: OFF
Use a non-metallic tool to move switch positions.

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Step 2: Handling
Handle all parts carefully to prevent damage. Whenever possible, transport the
system to the installation site in the original shipping containers. Rosemount flow
sensors are shipped with end covers that protect it from mechanical damage. For
PTFE lined sensors the cover also prevents normal liner relaxation. Remove the
end covers just before installation.
Figure 3. Rosemount 8750W flanged sensor support for handling
½- through 4-Inch Sensors 5-Inch and Lar
g
er Sensors

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Step 3: Mounting
Upstream/downstream piping
To ensure specification accuracy over widely varying process conditions, install
the sensor a minimum of five straight pipe diameters upstream and two pipe
diameters downstream from the electrode plane (see Figure 4).
Figure 4. Upstream and downstream straight pipe diameters
Installations with reduced upstream and downstream straight runs are possible.
In reduced straight run installations, absolute performance may shift. Reported
flow rates will still be highly repeatable.
The sensor should be mounted so the FORWARD end of the flow arrow points in
the direction of flow through the sensor (see Figure 5).
Figure 5. Flow direction
5 Pipe Diameters 2 Pipe Diameters
Flow

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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.
Figure 6. Sensor orientation
Mounting position
The electrodes in the sensor are properly orientated when the two measurement
electrodes are in the 3 and 9 o’clock position or within 45 ° from the vertical, as
shown on the right of Figure 7. Avoid any mounting orientation where the two
measurement electrodes are in the 6 and 12 o’clock position as shown on the left
of Figure 7.
Figure 7. Sensor mounting position
FLOW
FLOW
Incorrect Correct

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Step 4: Installation
Flanged sensors
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. Gaskets are required on each side of a grounding ring. All other
applications (including sensors with lining protectors or a grounding electrode)
require only one gasket on each end connection.
Figure 8. Flanged gasket placement
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.

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Flange bolts
Do not bolt one side at a time. Tighten each side 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 1 on
page 12. 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 9 on page 11 to 20% 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 or until the leak between the process and sensor flanges stop.
If leakage has not stopped 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. Sensors require a second
tightening 24 hours after the initial installation. Over time, sensor liner materials
may deform under pressure.
Figure 9. Flange bolt torquing sequence
For torque values not listed in Table 1, Table 2, or Table 3, contact technical
support.

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Table 1. Suggested flange bolt torque values for ASME
Size code Line size
PTFE liner Neoprene liner
Class 150
(pound-feet)
Class 300
(pound-feet)
Class 150
(pound-feet)
Class 300
(pound-feet)
005 0.5 inch (15 mm) 8 8 - -
010 1 inch (25 mm) 8 12 - -
015 1.5 inch (40 mm) 13 25 7 18
020 2 inch (50 mm) 19 17 14 11
025 2.5 inch (65 mm) 22 24 17 16
030 3 inch (80 mm) 34 35 23 23
040 4 inch (100 mm) 26 50 17 32
050 5 inch (125 mm) 36 60 25 35
060 6 inch (150 mm) 45 50 30 37
080 8 inch (200 mm) 60 82 42 55
100 10 inch (250 mm) 55 80 40 70
120 12 inch (300 mm) 65 125 55 105
140 14 inch (350 mm) 85 110 70 95
160 16 inch (400 mm) 85 160 65 140
180 18 inch (450 mm) 120 170 95 150
200 20 inch (500 mm) 110 175 90 150
240 24 inch (600 mm) 165 280 140 250
300 30 inch (750 mm) 195 415 165 375
360 36 inch (900 mm) 280 575 245 525

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Table 2. Suggested flange bolt torque values for EN1092-1
Size
code Line size
PTFE liner
PN10 PN 16 PN 25 PN 40
(Newton-meter) (Newton-meter) (Newton-meter) (Newton-meter)
005 0.5-inch
(15 mm) 10
010 1 inch
(25 mm) 20
015 1.5 inch
(40 mm) 50
020 2 inch
(50 mm) 60
025 2.5 inch
(65 mm) 50
030 3 inch
(80 mm) 50
040 4 inch
(100 mm) 50 70
050 5.0 inch
(125 mm) 70 100
060 6 inch
(150mm) 90 130
080 8 inch
(200 mm) 130 90 130 170
100 10 inch
(250 mm) 100 130 190 250
120 12 inch
(300 mm) 120 170 190 270
140 14 inch
(350 mm) 160 220 320 410
160 16 inch
(400 mm) 220 280 410 610
180 18 inch
(450 mm) 190 340 330 420
200 20 inch
(500 mm) 230 380 440 520
240 24 inch
(600 mm) 290 570 590 850

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Table 2. (cont) Suggested flange bolt torque values for EN1092-1
Size
code Line size
Neoprene liner
PN 10 PN 16 PN 25 PN 40
(Newton-meter) (Newton-meter) (Newton-meter) (Newton-meter)
010 1 inch
(25 mm) 20
015 1.5 inch
(40 mm) 30
020 2 inch
(50 mm) 40
025 2.5 inch
(65 mm) 35
030 3 inch
(80 mm) 30
040 4 inch
(100 mm) 40 50
050 5.0 inch
(125 mm) 50 70
060 6 inch
(150 mm) 60 90
080 8 inch
(200 mm) 90 60 90 110
100 10 inch
(250 mm) 70 80 130 170
120 12 inch
(300 mm) 80 110 130 180
140 14 inch
(350 mm) 110 150 210 280
160 16 inch
(400 mm) 150 190 280 410
180 18 inch
(450 mm) 130 230 220 280
200 20 inch
(500 mm) 150 260 300 350
240 24 inch
(600 mm) 200 380 390 560
Table 3. Flange bolt torque and load specifications for large line sizes
AWWA C207 (Ft-Lbs) EN1092-1 (N-m)
40-in. (1000 mm)
Class D 757
40-in. (1000 mm)
PN6 208
Class E 757 PN10 413
42-in. (1050 mm)
Class D 839 PN16 478
Class E 839 48-in. (1200 mm) PN6 375
48-in. (1200 mm)
Class D 872 PN10 622
Class E 872
AS2129 (N-m) AS4087 (N-m)
40-in. (1000 mm)
Table D 614 40-in. (1000 mm) PN16 612
Table E 652 PN21 515
48-in. (1200 mm)
Table D 786 48-in. (1200 mm) PN16 785
Table E 839 PN21 840

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Step 5: Grounding
Use Table 4 to determine which process grounding option to follow for proper
installation. The sensor case should be grounded in accordance with national and
local electrical codes. Failure to do so may impair the protection provided by the
equipment.
Figure 10. Grounding straps in conductive lined pipe or reference electrode in
lined pipe
Figure 11. Grounding with grounding rings or lining protectors in conductive pipe
Table 4. Process grounding installation
Process grounding options
Type of pipe Grounding straps
Grounding
rings
Reference
electrode
Lining
protectors
Conductive
Unlined Pipe See Figure 10 See Figure 11 See Figure 13 See Figure 11
Conductive
Lined Pipe
Insufficient
Grounding See Figure 11 See Figure 10 See Figure 11
Non-Conductive
Pipe
Insufficient
Grounding See Figure 12 Not Recommended See Figure 12
Grounding
Rings or
Lining
Protectors

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Figure 12. Grounding with grounding rings or lining protectors in non-conductive
pipe
Figure 13. Grounding with reference electrode in conductive unlined pipe
Grounding
Rings or
Lining
Protectors

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Step 6: Wiring
This wiring section covers the connection between the transmitter and sensor,
the 4-20 mA loop, and supplying power to the transmitter. Follow the conduit
information, cable requirements, and disconnect requirements in the sections
below.
Conduit ports and connections
Both the sensor and transmitter junction boxes have ports for 1/2-inch NPT
conduit connections or optional M20 connection is available. These connections
should be made in accordance with national, local, and plant electrical codes.
Unused ports should be sealed with metal plugs. Proper electrical installation is
necessary to prevent errors due to electrical noise and interference. Separate
conduits are not necessary for the coil drive and electrode cables, but a dedicated
conduit line between each transmitter and sensor is required. Shielded cable
must be used for best results in electrically noisy environments. When preparing
all wire connections, remove only the insulation required to fit the wire
completely under the terminal connection. Removal of excessive insulation may
result in an unwanted electrical short to the transmitter housing or other wire
connections. For flanged sensors installed into an application requiring IP68
protection, sealed cable glands, conduit, and conduit plugs that meet IP68
ratings are required. Option Codes R05, R10, R15, R20, R25, and R30 provide a
pre-wired potted and sealed junction box as additional protection to prevent the
ingress of water. These options still require the use of sealed conduits to meet
IP68 protection requirements.
Conduit requirements
A single dedicated conduit run for the coil drive and electrode cable is needed
between the sensor and the remote transmitter. See Figure 14. Bundled cables
in a single conduit are likely to create interference and noise problems in the
system.
Electrode cables should not be run together and should not be in the same cable
ray with power cables.
Output cables should not be run together with power cables.
Select conduit size appropriate to feed cables through to the flowmeter.
Figure 14. Conduit preparation
Power Power
Outputs
Coil Drive and
Electrode Cables Power
Wrong
Coil Drive and
Electrode Cables
Outputs
Power
Outputs
Correct

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Run the appropriate size cable through the conduit connections in your magnetic
flowmeter system. Run the power cable from the power source to the
transmitter. Run the coil drive and electrode cables between the flowmeter
sensor and transmitter.
Installed signal wiring should not be run together and should not be in the
same cable tray as AC or DC power wiring.
Device must be properly grounded according to national and local electric
codes.
Rosemount combination cable part number 08732-0753-1003 (ft) or
08732-0753-2004 (m) is required to be used to meet EMC requirements.
Transmitter to sensor wiring
The transmitter can be integral to the sensor or remotely mounted following the
wiring instructions.
Remote mount cable requirements and preparation
For installations using the individual coil drive and electrode cable, lengths should
be limited to less than 1,000 feet (300 meters). Equal length cable is required for
each. See Table 5 on page 19.
For installations using the combination coil drive and electrode cable, lengths
should be limited to less than 330 feet (100 meters). See Table 5 on page 19.
Prepare the ends of the coil drive and electrode cables as shown in Figure 15.
Limit the unshielded wire length to 1-inch on both the coil drive and electrode
cables. Any unsheathed wire should be wrapped with proper insulation. Excessive
lead length or failure to connect cable shields can create electrical noise resulting
in unstable meter readings.
Figure 15. Cable preparation detail
Cable Shield
1.00
(26)
NOTE
Dimensions are in inches (mm).

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To order cable specify length as quantity desired.
25 feet = Qty (25) 08732-0753-1003
Wiring the transmitter to the sensor
When using individual cables for coil drive and electrode refer to Table 6. If using
the combination coil drive and electrode cable, refer to Table 7. See Figure 16
on page 20 for transmitter specific wiring diagrams.
1. Connect the coil drive cable using terminals 1, 2, and 3.
2. Connect the electrode cable using terminals 17, 18, and 19
Table 6. Individual coil and electrode cables
Table 5. Cable requirements
Description Length Part number
Coil Drive Cable (14 AWG)
Belden 8720, Alpha 2442
or equivalent
ft
m08712-0060-0001
08712-0060-2013
Electrode Cable (20 AWG)
Belden 8762, Alpha 2411
or equivalent
ft
m08712-0061-0001
08712-0061-2003
Combination Cable
Coil Drive Cable (18 AWG) and
Electrode Cable (20 AWG)
ft
m08732-0753-1003
08732-0753-2004
Potential Shock Hazard Across Terminals 1 & 2 (40 VAC).
Transmitter terminal Sensor terminal Wire gauge Wire color
1 1 14 Clear
2 2 14 Black
3 3 14 Shield
17 17 20 Shield
18 18 20 Black
19 19 20 Clear

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Table 7. Combination coil and electrode cable
Figure 16. Remote mount wiring diagrams
Transmitter terminal Sensor terminal Wire gauge Wire color
1 1 18 Red
2 2 18 Green
3 3 18 Shield
17 17 20 Shield
18 18 20 Black
19 19 20 White