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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February 2014
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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Quick Start Guide
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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February 2014
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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Quick Start Guide
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.