Rosemount 8750WA User manual

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¢00825-0100-4725.¤
Quick Installation Guide
00825-0100-4750, Rev BA
June 2009 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
End
Rosemount 8750WA Magnetic Flowmeter
System (Transmitter and Sensor)
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Quick Installation Guide
00825-0100-4750, Rev BA
June 2009
Rosemount 8750WA
2
© 2009 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 Inc.
12001 Technology Drive
Eden Prairie, MN USA 55344
T (US) [phone]
T (Intnl) [phone]
F [phone]
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Quick Installation Guide
00825-0100-4750, Rev BA
June 2009 Rosemount 8750WA
3
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).
If the Rosemount 8750WA is mounted separately from the sensor, it is not subject to
limitations that might apply to the sensor.
Figure 1. Rosemount 8750WA 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, CM20, or
PG 13.5 Electrical Conduit
Connections (3 places)
1/2”-14 NPT, CM20, or PG 13.5
Sensor Conduit Connections (2
places)
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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 2. 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 3).
The 8750WA may be installed with as few as zero pipe diameters upstream. Consult the
factory for performance in applications with less than ideal straight runs. Sensors can be
installed with as few as zero diameters of straight run.
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 3. 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 4.
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 5. Avoid any mounting
orientation that positions the top of the sensor at 45° from the vertical or horizontal position.
Figure 4. Sensor Orientation
Figure 5. Rosemount 8750WA Wafer Sensor Mounting Position
FLOW
FLOW
45° Electrode Plane
45° Electrode Plane
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June 2009 Rosemount 8750WA
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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. 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 6 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 6. Flange Bolt Torquing Sequence
15
3
7
8
4
62
8-bolt
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STEP 4 CONTINUED...
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.
Alignment and Bolting
1. On 1.5 - through 8-inch (40 through 200 mm) line sizes. Rosemount strongly
recommends ordering the centering rings to insure proper centering of the sensor
between the process flanges. Place the alignment rings over each end of the sensor.
The smaller line sizes, 0.5 and 1 in. (15 and 25 mm), do not require centering rings.
2. Insert studs for the bottom side of the sensor between the pipe flanges. Stud
specifications are listed in Table 2.
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.
Table 1. Suggested Flange Bolt Torque Values for Rosemount 8750WA Flanged Sensors
PTFE Polyurethane/Neoprene liner
Size
Code Line Size 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 7 18
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) 195 415 165 375
360 36 inch (900 mm) 280 575 245 525
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STEP 4 CONTINUED...
3. Place the sensor between the flanges. Make sure that the alignment rings are properly
placed in the studs. The studs should be aligned with the markings on the rings that
correspond to the flange you are using.
4. Insert the remaining studs, washers, and nuts.
5. Tighten to the torque specifications shown in Table 3 on page 11. Do not overtighten the
bolts or the liner may be damaged.
Flange Bolts
Tighten flange bolts in crosswise 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.
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
Figure 7. Gasket Placement with Centering Rings
Table 3. 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
Alignment
Rings
Installation,
Studs Nuts
and Washers
Customer-supplied
Gasket
FLOW
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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 earth grounded in accordance with national and local electrical
codes. Failure to do so may impair the protection provided by the equipment.
Table 4. Process Grounding Installation
Process Grounding Options
Type of Pipe Grounding
Straps Grounding Rings Grounding Electrode Lining Protectors
Conductive
Unlined Pipe See Figure 8 Not Required Not Required See Figure 9
Conductive Lined
Pipe Insufficient Grounding See Figure 9 See Figure 8 See Figure 9
Non-Conductive
Pipe Insufficient Grounding See Figure 10 See Figure 11 See Figure 10
Figure 8. Grounding Straps or Grounding Electrode in Lined Pipe
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STEP 5 CONTINUED...
Figure 9. Grounding with Grounding Rings or Lining Protectors
Figure 10. Grounding with Grounding Rings or Lining Protectors
Grounding
Rings or
Lining
Protectors
Grounding
Rings or
Lining
Protectors
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June 2009
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STEP 5 CONTINUED...
Figure 11. Grounding with Grounding Electrode
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STEP 6: WIRING
STEP 6: WIRING
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 local or 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 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 Cables
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. 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 electrode and coil drive cables. Excessive lead length or failure to
connect cable shields can create electrical noise resulting in unstable meter readings.
• 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 model number 08712-0752-0001 (ft) or
08712-0752-0003 (m) is required to be used to meet EMC requirements.
8750WA32 Wiring Connections
Powering the Transmitter
This wiring section covers supplying power to the transmitter, the connections between the
sensor and the transmitter, and the 4-20 mA loop.
Connect power to the transmitter according to local electrical requirements. For AC power
applications (90-250 VAC, 50-60 Hz) connect AC Neutral to terminal 9 (AC N/L2) and
connect AC Line to terminal 10 (AC/L1). For DC power applications, connect negative to
terminal 9 (DC -) and positive to terminal 10 (DC +). Units powered by 12-42 V DC power
supply may draw up to 1 amp of current. Follow the supply wire and disconnect
requirements below:
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STEP 6 CONTINUED...
Supply Wire Requirements
Use 14 to 18 AWG wire rated for the proper temperature of the application. For connections
in ambient temperatures above 140 °F (60 °C), use a wire rated for 176 °F (80 °C). For
ambients greater than 176 °F (80 °C), use a wire rated for 230 °F (110 °C). For DC powered
transmitters with extended cable lengths, verify that there is a minimum of 12 V DC at the
terminals of the transmitter.
Disconnects
Connect the device through an external disconnect or circuit breaker. Clearly label the
disconnect or circuit breaker and locate it near the transmitter and per local electrical
control.
Installation Category
The installation category for the 8750WA32 is (Overvoltage) Category II.
Overcurrent Protection
The Rosemount 8750WA32 Flowmeter Transmitter requires overcurrent protection of the
supply lines. Maximum ratings of overcurrent devices are as follows:
Table 5. Maximum ratings
Figure 12. Power Supply Current
Power System Fuse Rating Manufacturer
90-220 V AC 250 V; 2 Amp, Quick Acting Bussman AGCI or Equivalent
42 V DC 50 V; 3 Amp, Quick Acting Bussman AGCI or Equivalent
12 18 24 30 36 42
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
Power Supply (Volts)
I = 10/V
I = Supply current requirement (Amps)
V = Power supply voltage (Volts)
Supply Current (Amps)
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STEP 6 CONTINUED...
Connect 4–20 mA Loop External Power Source
The 4–20 mA output loop signal may be powered internally or externally. The default
position of the internal/external analog power jumper is in the internal position. The
user-selectable power supply jumper is located on the electronics board.
Internal
The 4–20 mA analog power loop may be powered from the transmitter itself. Resistance in
the loop must be 600 ohms or less. If a HART Field Communicator or control system will be
used, it must be connected across a minimum of 250 ohms resistance in the loop.
External
HART multidrop installations require a 10–30 V DC external analog power source. If a HART
Field Communicator or control system is to be used, it must be connected across a
minimum of 250 ohms resistance in the loop.
To connect external power to the 4–20 mA loop, connect -DC to Terminal 1 and +DC to
Terminal 2.
NOTE
To connect any of the other output options (pulse output and/or digital input/output), consult
the comprehensive product manual.
8750WA12 Wiring Instructions
Wire the transmitter according to local electrical requirements. Ground the transmitter cage
via the threaded conduit connection. For ac power applications, connect ac Neutral to
terminal N and connect ac Line to terminal L1. For dc power applications, properly connect
the positive and negative terminals. Units powered by 12-42 V dc power supply may draw
up to 1 amp of current. In addition, follow the supply wire and disconnect requirements
below:
Figure 13. Transmitter Power Connections
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STEP 6 CONTINUED...
Supply Wire Requirements
Use 12 to 18 AWG wire rated for the proper temperature of the application. For connections
in ambient temperatures above 140 °F (60 °C), use a wire rated for 176 °F (80 °C). For
ambients greater than 176 °F (80 °C), use a wire rated for 230 °F (110 °C). For DC powered
transmitters with extended cable lengths, verify that there is a minimum of 12 V DC at the
terminals of the transmitter.
Disconnects
Connect the device through an external disconnect or circuit breaker. Clearly label the
disconnect or circuit breaker and locate it near the transmitter and per local electrical
control.
Overcurrent Protection
The Rosemount 8712 Flowmeter Transmitter requires overcurrent protection of the supply
lines. Maximum ratings of overcurrent devices are as follows:
Figure 14. Power Supply Current
Table 6. Overcurrent Ratings
Power System Fuse Rating Manufacturer
90-220 V AC 250 V; 2 Amp, Quick Acting Bussman AGCI or Equivalent
42 V DC 50 V, 3 Amp, Quick Acting Bussman AGCI or Equivalent
1.0
0.8
0.6
0.4
0.2
0
010 20 30 40 50
Power Supply (Volts)
Supply Current (Amps)
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STEP 6 CONTINUED...
Connect 4–20 mA Loop External Power Source
The 4–20 mA 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.
Internal
The 4–20 mA analog power loop may be powered from the transmitter itself. Resistance in
the loop must be 600 ohms or less. If a HART Field Communicator or control system will be
used, it must be connected across a minimum of 250 ohms resistance in the loop.
External
HART multidrop installations require a 10–30 V DC external analog power source. If a HART
Field Communicator or control system is to be used, it must be connected across a
minimum of 250 ohms resistance in the loop.
To connect external power to the 4–20 mA loop, connect -DC to Terminal 8 and +DC to
Terminal 7.
NOTE
To connect any of the other output options (pulse output and/or digital input/output), consult
the comprehensive product manual.
Transmitter to Sensor Wiring
A single dedicated conduit run for the coil drive and electrode cables is needed between a
sensor and a remote transmitter. Bundled cables in a single conduit are likely to create
interference and noise problems in your system. Use one set of cables per conduit run.
Figure 15. Cable Preparation Detail
Cable Shield
1.00
(26)
NOTE
Dimensions are in inches (millimeters).
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STEP 6 CONTINUED...
Figure 16. 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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