Emerson Rosemount 8750WA User manual

www.rosemount.com
¢00825-0100-4725.¤
Quick Installation Guide
00825-0100-4750, Rev BB
January 2013 Rosemount 8750WA
Start
Step 1: Pre-Installation
Step 2: Handling
Step 3: Mounting
Step 4: Installation
(Flanged Sensors)
(Wafer Sensors)
Step 5: Grounding
Step 6: Wiring
Step 7: Basic Configuration
Product Certifications
End
Rosemount 8750WA Magnetic Flowmeter
System (Transmitter and Sensor)
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2
© 2013 Rosemount Inc. All rights reserved. All marks property of owner.
IMPORTANT NOTICE
This installation guide provides basic guidelines for the Rosemount®8750WA. It does not
provide instructions for detailed configuration, diagnostics, maintenance, service,
troubleshooting, explosion-proof, flame-proof, or intrinsically safe (I.S.) installations.
Refer to the Rosemount 8750WA reference manual (document number
00809-0100-4750) for more instructions. The manual and this QIG are also available
electronically on www.rosemount.com.
WARNING
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 appropriate FM or CSA approval.
WARNING
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.
To avoid possible damage to the sensor liner ends, do not use metallic or spiral-wound
gaskets. 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 limits. Failure to observe
these instructions could result in severe damage to the sensor lining and possible sensor
replacement.
Emerson Process Management
Rosemount Flow
7070 Winchester Circle,
Boulder, CO 80301
Tel (USA) 800 522 6277
Tel (International) [phone]
Fax [phone]
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STEP 1: PRE-INSTALLATION
Before installing the Rosemount 8750WA Magnetic Flowmeter Transmitter, 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 8750WA 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 8750WA transmitter is mounted separately from the sensor, it is not
subject to limitations that might apply to the sensor.
NOTE:
*M20 and PG 13.5 connections are available with the use of threaded conduit adapters.
Figure 1. Rosemount 8750WA32E Dimensional Drawing
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. 8750WA12E 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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STEP 1 CONTINUED...
Environmental Considerations
To ensure maximum transmitter life, avoid excessive heat and 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 8750WA transmitters require external
power so there must be access to a suitable power source.
Installation Procedures
Rosemount 8750WA 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 8750WA transmitter to the mounting bracket using the mounting
screws.
Identify Options and Configurations
The standard application of the 8750WA 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:
• Multidrop Communications
• Digital Output
• Digital Input
• Pulse Output
Additional options may apply. Be sure to identify those options and configurations that apply
to your situation and keep a list of them nearby for consideration during the installation and
configuration procedures.
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STEP 1 CONTINUED...
Hardware Jumpers/Switches
The 8750WA electronics board is equipped with three or four 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 (8750WA32), 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 is not necessary to change the setting of the hardware switches. If you
need to change the switch settings, complete the steps outlined in the manual.
Electrical Considerations
Before making any electrical connections to the Rosemount 8750WA, consider the local and
plant electrical standards and be sure to have the proper power supply, conduit, and other
accessories.
Rotate Transmitter Housing
The integral electronics housing can be rotated on the sensor in 90° increments by
loosening the four mounting bolts on the bottom of the housing, and reinstalling the bolts.
When reinstalling the housing, be sure the surface is clean 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 (8750WA32 only)
Transmitter Security: OFF
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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. 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.
Figure 3. Rosemount 8750WA Flanged Sensor Support for Handling
½- through 4-Inch Sensors
6-Inch and Larger 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).
The 8750WA sensor may be installed with as few as zero pipe diameters upstream. Consult
the factory for performance in applications with less than ideal straight runs.
Flow Direction
The sensor should be mounted so the FORWARD end of the flow arrow, shown on the
sensor identification tag, points in the direction of flow through the sensor.
Sensor Orientation
The sensor should be installed in a position that ensures the sensor remains full during
operation. Vertical installation allows upward process fluid flow and keeps the
cross-sectional area full, regardless of flow rate. Horizontal installation should be restricted
to low piping sections that are normally full. In these cases, orient the electrode plane to
within 45 degrees of horizontal.
Figure 4. Upstream and Downstream Straight Pipe Diameters
5 Pipe Diameters 2 Pipe Diameters
Flow
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STEP 3 CONTINUED...
The electrodes in the Rosemount 8750WA flanged sensor are properly orientated when the
two measurement electrodes are in the 3 and 9 o’clock positions, as shown on the right of
Figure 5.
The electrodes in the Rosemount 8750WA wafer sensor are properly orientated when the
top of the sensor is either vertical or horizontal, as shown in Figure 6. Avoid any mounting
orientation that positions the top of the sensor at 45° from the vertical or horizontal position.
Figure 5. Sensor Orientation
Figure 6. Rosemount 8750WA Wafer Sensor Mounting Position
FLOW
FLOW
45° Electrode Plane
45° Electrode Plane
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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. Metallic or
spiral-wound gaskets can damage the liner. 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.
Flange Bolts
Suggested torque values by sensor line size and liner type are listed in Table 1 on page 11.
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 8 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 7. Flanged gasket placement
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Figure 8. Flange Bolt Torquing Sequence
Table 1. Suggested Flange Bolt Torque Values for ASME B16.5 (ANSI) Flanged Sensors
Size
Code Line Size
PTFE Liner Polyurethane/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) 812 - -
015 1.5 inch (40 mm) 13 25 718
020 2 inch (50 mm) 19 17 14 11
030 3 inch (80 mm) 34 35 23 23
040 4 inch (100 mm) 26 50 17 32
060 6 inch (150mm) 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(1)(2)
(1) Sensors ordered with flange option code “A1” use MSS-SP44 Class 150 flanges.
(2) Sensors ordered with flange option code “AA” use AWWA Table D flanges
Sensors ordered with flange option code “AB” use AWWA Table E flanges
-165(1)(2) -
360 36 inch (900 mm) 280(1)(2) -245(1)(2) -
400 40 inch (1000 mm) - - -(2)(3)
(3) Neoprene Liner only
-
420 42 inch (1050 mm) - - -(2)(3) -
480 48 inch (1200 mm) - - -(2)(3) -
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Wafer 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. Metallic or
spiral-wound gaskets can damage the liner. Gaskets are required on each side of a
grounding ring. See Figure 9 below.
Alignment
1. On 1.5 - through 8-inch (40 through 200 mm) line sizes. Rosemount strongly
recommends installing the alignment spacers provided to insure proper centering of the
wafer sensor between the process flanges. The smaller line sizes, 0.5 and 1 in. (15 and
25 mm), do not require alignment spacers.
2. Insert studs for the bottom side of the sensor between the pipe flanges and center the
alignment spacer in the middle of the stud. See Figure 9 for the bolt hole locations
recommended for the spacers provided. Stud specifications are listed in Table 2.
3. Place the sensor between the flanges. Make sure that the alignment spacers are
properly centered on the studs. For vertical flow installations slide the oring over the stud
to keep the spacer in place. See Figure 9. To ensure the spacers match the flange size
and class rating for the process flanges see Table 3.
4. Insert the remaining studs, washers, and nuts.
5. Tighten to the torque specifications shown in Table 4 on page 13. Do not overtighten the
bolts or the liner may be damaged.
NOTE
Using carbon steel bolts on smaller line sizes, 0.5 and 1 in. (15 and 25 mm), rather than the
required stainless steel bolts, will degrade performance.
Figure 9. Wafer gasket placement
Table 2. Stud Specifications
Nominal Sensor Size Stud Specifications
0.5 – 1 inch (15 – 25 mm) 316 SST ASTM A193, Grade B8M Class 1 threaded mounted studs
1.5 – 8 inch (40 – 200 mm) CS, ASTM A193, Grade B7, threaded mounting studs
Spacer Installation
Horizontal meters Vertical meters
O-ring
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STEP 4 CONTINUED...
Table 3. Rosemount Alignment Spacer Table
To order an Alignment Spacer Kit (qty 3 spacers) use p/n 08711-3211-xxxx along with the
Dash No. above.
Flange Bolts
Wafer sensors require threaded studs. See Table 8 on page 11 for torque sequence. Always
check for leaks at the flanges after tightening the flange bolts. All sensors require a second
torquing 24 hours after initial flange bolt tightening.
Rosemount Alignment Spacer Table
Dash No. Line Size Flange Rating(in) (mm)
AA15 1.5 40 ANSI - 150#
AA20 250 ANSI - 150#
AA30 380 ANSI - 150#
AA40 4100 ANSI - 150#
AA60 6150 ANSI - 150#
AA80 8200 ANSI - 150#
AB15 1.5 40 ANSI - 300#
AB20 250 ANSI - 300#
AB30 380 ANSI - 300#
AB40 4100 ANSI - 300#
AB60 6150 ANSI - 300#
AB80 8200 ANSI - 300#
Table 4. Rosemount 8750WA Wafer Sensor Torque Specifications
Size Code Line Size Pound-feet Newton-meter
005 0.5 inch (15 mm) 5 7
010 1 inch (25 mm) 10 14
015 1.5 inch (40 mm) 15 20
020 2 inch (50 mm) 25 34
030 3 inch (80 mm) 40 54
040 4 inch (100 mm) 30 41
060 6 inch (150 mm) 50 68
080 8 inch (200 mm) 70 95
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STEP 5: GROUNDING
Use Table 5 to determine which process grounding option to follow for proper installation.
The sensor case should be earth grounded in accordance with national and local electrical
codes. Failure to do so may impair the protection provided by the equipment.
Table 5. Process Grounding Installation
Process Grounding Options
Type of Pipe Grounding
Straps Grounding Rings Grounding Electrode Lining Protectors
Conductive
Unlined Pipe See Figure 10 Not Required Not Required 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 on page 15 See Figure 13 on page 15 See Figure 12 on page 15
Figure 10. Grounding Straps or Grounding Electrode in Lined Pipe
Figure 11. Grounding with Grounding Rings or Lining Protectors
Grounding
Rings or
Lining
Protectors
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Figure 12. Grounding with Grounding Rings or Lining Protectors
Figure 13. Grounding with Grounding Electrode
Grounding
Rings or
Lining
Protectors
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STEP 6: WIRING
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 with optional CM20 or PG 13.5 connections 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 signal 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 SA,
SB, SC, SD, SE, and SF provide a pre-wired potted and sealed junction box 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 signal 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. Use one set of cables per
conduit run.
Figure 14. Conduit Preparation
Wrong Correct
Coil Drive
and
Electrode
Cables
Power
Outputs
Power
Outputs
Coil Drive
and
Electrode
Cables
Power
Outputs
Power
Outputs
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STEP 6 CONTINUED...
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 signal 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 or earthed according to 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 signal cable, lengths should be limited to
less than 1,000 feet (300 meters). Equal length cable is required for each. See Table 6 on
page 18.
For installations using the combination coil drive and signal cable, lengths should be limited
to less than 330 feet (100 meters). See Table 6 on page 18.
Prepare the ends of the coil drive and signal cables as shown in Figure 15. Limit the
unshielded wire length to 1-inch on both the coil drive and signal 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 (millimeters).
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STEP 6 CONTINUED...
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 signal refer to Table 7. If using the
combination coil drive and signal cable, refer to Table 8. See Figure 16 on page 19 for
transmitter specific wiring diagrams.
1. Connect the coil drive cable using terminals 1, 2, and 3(ground).
2. Connect the signal cable using terminals 17, 18, and 19
Table 7. Individual Coil and Signal Cables
Table 8. Combination Coil and Signal Cable
Table 6. Cable Requirements
Description Length Part Number
Coil Drive Cable (14 AWG)
Belden 8720, Alpha 2442
or equivalent
ft
m08712-0060-0001 08712-0060-2013
Signal Cable (20 AWG)
Belden 8762, Alpha 2411
or equivalent
ft
m08712-0061-0001 08712-0061-2003
Combination Cable
Coil Drive Cable (18 AWG) and
Signal Cable (20 AWG)
ft
m08732-0753-1003 08732-0753-2004
WARNING
Potential Shock Hazard Across Terminals 1 & 2 (40Vac).
Transmitter Terminal Sensor Terminal Wire Gauge Wire Color
1 1 14 Clear
2 2 14 Black
3 or Ground 3 or Ground 14 Shield
17 17 20 Shield
18 18 20 Black
19 19 20 Clear
Transmitter Terminal Sensor Terminal Wire Gauge Wire Color
1 1 18 Red
2 2 18 Green
3 or Ground 3 or Ground 18 Shield
17 17 20 Shield
18 18 20 Black
19 19 20 White
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STEP 6 CONTINUED...
NOTE
When using the Rosemount supplied combination cable, the signal wires for terminals 18
and 19 contain an addition shield wire. These two shield wires should be tied with the main
shield wire at terminal 17 at the sensor terminal block and cut back to the insulation in the
transmitter junction box. See Figure 17.
Figure 16. Remote Mount Wiring Diagrams
Figure 17. Combination Coil and Signal Cable Wiring Diagram
Transsmiter
Tube
Coil Drive Cable
1 Red 2 Green 3 Shield 17 Shield 18 Black 19 White
Cut Shield
Signal Cable
17 Shield 18 Black 19 White1 Red 2 Green 3 Shield
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STEP 6 CONTINUED...
Integral Mount Transmitters
The interconnecting wire harness for an integral mount transmitter is installed at the factory.
See Figure 18. Do not use cable other than that supplied by Emerson Process
Management, Rosemount, Inc.
Connecting the 4–20 mA Analog Signal
Cabling considerations
If possible, use individually shielded twisted pair cable, either in single pair or multi-pair
varieties. Unshielded cables may be used for short distances, provided ambient noise and
cross-talk will not adversely impact communication. The minimum conductor size is 0.51mm
diameter (#24 AWG) for cable runs less than 1,500 meters (@ 5,000 ft.) and 0.81mm
diameter (#20 AWG) for longer distances. Resistance in the loop must be 1000 ohms or
less.
The 4–20 mA analog output loop signal may be powered internally or externally. The default
position of the internal/external analog power switch is in the internal position. The
user-selectable power supply switch is located on the electronics board.
Figure 18. 8750WA32EST Integral Mount Wiring Diagram
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