Rosemount 3051SFA Operating Manual
Reference Manual
00809-0100-4028, Rev AA
October 2005
The 285 Annubar® Primary Element Series
www.rosemount.com
Reference Manual
00809-0100-4028, Rev AA
October 2005
Rosemount 285
285 Annubar Primary Element Series
NOTICE
Read this manual before working with the product. For personal and system safety, and for
optimum product performance, make sure you thoroughly understand the contents before
installing, using, or maintaining this product.
The United States has two toll-free assistance numbers and one International number.
Customer Central
1-800-999-9307 (7:00 a.m. to 7:00 P.M. CST)
International
1-(952) 906-8888
National Response Center
1-800-654-7768 (24 hours a day)
Equipment service needs
The products described in this document are NOT designed for nuclear-qualified
applications. Using non-nuclear qualified products in applications that require
nuclear-qualified hardware or products may cause inaccurate readings.
For information on Rosemount nuclear-qualified products, contact your local Rosemount
Sales Representative.
This device is intended for use in temperature monitoring applications and should not be
used in control and safety applications.
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Reference Manual
00809-0100-4028, Rev AA
October 2005
Rosemount 285
Table of Contents
SECTION 1 Introduction
SECTION 2 Installation
Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Section 2: Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Section 3: Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Section 4: Operation and Maintenance . . . . . . . . . . . . . . . . . . . 1-1
Appendix A: Specifications and Reference Data. . . . . . . . . . . . 1-1
Appendix B: Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Receiving and Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Returning the Product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Structural . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Functional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Environmental. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Access Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Process Flange Orientation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Optional Electronics Housing . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Cover Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Process Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Installation Flowchart and Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Tools and Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Mounting Brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Bolt Installation Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Instrument Manifolds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Straight Run Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Direct Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Horizontal Pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Vertical Pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Remote Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Valves and Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Impulse Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Pak-Lok Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Step 1: Determine the Proper Orientation . . . . . . . . . . . . . . . . 2-12
Step 2: Drill a Hole into the Pipe . . . . . . . . . . . . . . . . . . . . . . . 2-12
Step 3: Weld the Mounting Hardware . . . . . . . . . . . . . . . . . . . 2-13
Step 4: Insert into the Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Step 5: Mount the Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Remote Mount Head – temperatures below 250 °F (121 °C) . 2-15
Remote Mount Head – temperature above 250 °F (121 °C) . . 2-16
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Rosemount 285
Reference Manual
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October 2005
Duct Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Step 1: Determine the Proper Orientation . . . . . . . . . . . . . . . . 2-17
Step 2: Drill a Hole into the Duct . . . . . . . . . . . . . . . . . . . . . . . 2-17
Step 3: Assemble and check Fit-Up . . . . . . . . . . . . . . . . . . . . 2-18
Step 4: Insert into Duct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
Step 5: Mount the Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . 2-21
Remote Mount Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
SECTION 3 Commissioning
Commisioning the 951 transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Step 1: Mount the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Gas Flow Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Step 2: Connect Wiring and Power Up. . . . . . . . . . . . . . . . . . . . . . 3-2
Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Step 3: Configure the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Step 4: Trim the Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Zero Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Using the 275/375 HART Communicator . . . . . . . . . . . . . . . . . . . . 3-4
Local Re-ranging and Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Zero - 4 mA point. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Without an LCD meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
With an LCD meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Span - 20 mA point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Without an LCD meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
With an LCD meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Commissioning on the Bench . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Commissioning the 285 with the 2024 transmitter. . . . . . . . . . . . . . . . 3-6
Direct Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Liquid Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Liquid Service 3-Valve Manifold . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Gas Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Gas Service 3-Valve Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Wet Zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Steam Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3-Valve Steam No Flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Remote Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Zero the Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Check for System Leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
“Calibrate Out” Temperature Effects . . . . . . . . . . . . . . . . . . . . 3-11
Gas Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Steam Service or Liquid Service above 250 °F (121 °C) . . . . 3-14
SECTION 4 Operation and Maintenance
APPENDIX A Reference Data
TOC-2
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Remove the Flowmeter from Service . . . . . . . . . . . . . . . . . . . . . . . 4-3
Rosemount 285 Annubar Primary Specifications . . . . . . . . . . . . . . . .A-1
Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1
Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
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Rosemount 285
Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-3
Optional Rosemount 2024 Transmitter Specifications. . . . . . . . . . . . . A-7
Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-7
Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-7
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-9
Optional Rosemount 951 Transmitter Specifications. . . . . . . . . . . . . . A-9
Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-9
Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-10
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-11
Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-15
Rosemount 285 Annubar Primary Ordering Information . . . . A-15
Pipe I.D. Range Code–measured in inches (millimeters). . . . . . .A-17
APPENDIX B Approvals
Hazardous Locations Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Rosemount 2024 Product Certifications . . . . . . . . . . . . . . . . . . . . . . . B-1
Approved Manufacturing Locations . . . . . . . . . . . . . . . . . . . . . . . . B-1
European Directive Information . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Hazardous Locations Certifications . . . . . . . . . . . . . . . . . . . . . . . . B-2
TOC-3
Rosemount 285
Reference Manual
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October 2005
TOC-4
Reference Manual
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October 2005
Rosemount 285
Section 1 Introduction
Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-1
Receiving and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . page 1-2
Returning the Product . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-2
Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-2
USING THIS MANUAL This product manual provides installation, configuration, calibration,
troubleshooting, and maintenance instructions for the Annubar Flowmeter
Series.
Section 2: Installation
• Installation flowchart and checklist
• Orienting, mounting, and installing the flowmeter
• Commissioning the flowmeter according to the application
Section 3: Commissioning
• Commissioning on the Bench
• Commissioning the 285 with the 2024 transmitter
Section 4: Operation and Maintenance
• Troubleshooting information
• Disassembly
Appendix A: Specifications and Reference Data
• Specifications
• Dimensional drawings
Appendix B: Approvals
• Approvals certifications
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Rosemount 285
Reference Manual
00809-0100-4028, Rev AA
October 2005
RECEIVING AND INSPECTION
RETURNING THE PRODUCT
Annubar Primary Elements are available in different models and with different
options, so it is important to inspect and verify that the appropriate model was
delivered before installation.
Upon receipt of the shipment, check the packing list against the material
received and the purchase order. All items are tagged with a model number,
serial number, and customer tag number. Report any damage to the carrier.
To expedite the return process, call the Rosemount National Response
Center toll-free at 800-654-7768. This center, available 24 hours a day, will
assist you with any needed information or materials.
The center will ask for the following information:
• Product model
• Serial numbers
• The last process material to which the product was exposed
The center will provide
• A Return Material Authorization (RMA) number
• Instructions and procedures that are necessary to return goods that
were exposed to hazardous substances
NOTE
If a hazardous substance is identified, a Material Safety Data Sheet (MSDS),
required by law to be available to people exposed to specific hazardous
substances, must be included with the returned materials.
CONSIDERATIONS Information in this manual applies to circular pipes and square or rectangular
ducts only. Consult Rosemount Customer Central for instructions regarding
use in other duct configurations.
Limitations Structural
Structural limitations are printed on the sensor tag. Exceeding structural
limitations may cause sensor failure.
Functional
The most accurate and repeatable flow measurement occurs in the following
conditions:
• The structural limit differential pressure, as printed on the sensor tag, is
not exceeded.
• The instrument is not used for two-phase flow or for steam service
below saturation temperature.
Install the flowmeter in the correct location within the piping branch to prevent
measurement inaccuracies caused by flow disturbances.
The flowmeter can be installation with a maximum misalignment of 3 degrees
(see Figure 1-1). Misalignment beyond 3 degrees will cause flow
measurement errors.
1-2
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October 2005
Figure 1-1. Permissible
Misalignment
Rosemount 285
3°
3°
3°
Environmental Mount the Annubar Primary Element in a location with minimal ambient
temperature changes. Appendix A: Reference Data lists the temperature
operating limits. Mount to avoid vibration, mechanical shock, and external
contact with corrosive materials.
Access Requirements
Consider the need to access the flowmeter when choosing an installation
location and orientation.
Process Flange Orientation
Orient the process flanges on a remote mounted Annubar Primary Element so
that process connections can be made. For safety reasons, orient the
drain/vent valves so that process fluid is directed away from technicians when
the valves are used. In addition, consider the possible need for a testing or
calibration input.
Optional Electronics Housing
Terminal Side
The circuit compartment should not routinely need to be opened when the
unit is in service. Wiring connections are made through the conduit
openings on the top side of the housing. The field terminal side is marked
on the electronics housing. Mount the flowmeter so that the terminal side
is accessible. A 0.75-in. (19 mm) clearance is required for cover removal.
Use a conduit plug on the unused side of the conduit opening. A 3-in. (76
mm) clearance is required for cover removal if a meter is installed.
15-490022-901A, 15-490022-902, 15-490022-903.EPS
Cover Installations
Always install the electronics housing covers metal-to-metal to ensure a
proper seal.
1-3
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October 2005
Figure 1-2. Electronics Housing
ROSEMOUNT 951
ROSEMOUNT 2024
Process Considerations The process connections on the 2024 transmitter flange are 1/4–18 NPT.
These are Class 2 threads; use the plant-approved lubricant or sealant when
making the process connections. The process connections on the transmitter
flange are on 2
five-valve manifold. The process connections on the 951 transmitter are
NPT. These are class 3 threads; use the plant-approved lubricant or sealant
when making the process connections. The process connections on the
transmitter are 1
1
/8–in. (54 mm) centers to allow direct mounting to a three- or
1
/2-in. (39 mm) apart.
1
/8-27
Electrical For the Rosemount 951 electrical installation see 00825-0100-4362.
For the Rosemount 2024 electrical installation see 00809-0100-4592.
1-4
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Rosemount 285
Section 2 Installation
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1
Installation Flowchart and Checklist . . . . . . . . . . . . . . . . page 2-2
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-12
SAFETY MESSAGES Instructions and procedures in this section may require special precautions to
ensure the safety of the personnel performing the operations. Please refer to
the following safety messages before performing any operation in this section.
Explosions could result in death or serious injury:
• Do not remove the transmitter cover in explosive atmospheres when the circuit is
live.
• Before connecting a Rosemount HART Communicator in an explosive
atmosphere, make sure the instruments in the loop are installed in accordance
with intrinsically safe or non-incendive field wiring practices.
• Verify that the operating atmosphere of the transmitter is consistent with the
appropriate hazardous locations certifications.
• Both transmitter covers must be fully engaged to meet explosion-proof
requirements.
Failure to follow these installation guidelines could result in death or serious injury:
• Make sure only qualified personnel perform the installation.
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Rosemount 285
Reference Manual
00809-0100-4028, Rev AA
October 2005
INSTALLATION FLOWCHART AND CHECKLIST
Figure 2-1. Installation Chart
Figure 2-1 is an installation flowchart that provides guidance through the
installation process. Following the figure, an installation checklist has been
provided to verify that all critical steps have been taken in the installation
process. The checklist numbers are indicated in the flowchart.
Start.
Unpack Instrument
Review Product
Manual.
Verify proper location.
Hazardous
Location?
Bench
Configure?
Refer to transmitter
manuals for approvals
Refer to transmitter manual
for configuration
Verify
Remote
Mounted
Electronics?
Install flowmeter
Wire
Remote
Mounted
Electronics?
Commission
Finish.
Install hardware
Install electronics
Commission
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Rosemount 285
The following list is a summary of the steps required to complete a flowmeter
installation. If this a new installation, begin with step 1. If the mounting is
already in place, verify that the hole size and the fittings match the
recommended specifications (see Table 2-3 on page 2-13) and begin with
step 5.
1. Determine where the flowmeter is to be placed within the piping
system.
2. Establish the proper orientation as determined by the intended
application.
3. Review the transmitter manual and determine if the flowmeter is
located in a hazardous location.
4. Confirm the configuration.
5. Drill the correct sized hole into the pipe.
For instruments equipped with opposite-side support, drill a second
hole 180° from the first hole.
6. Weld the mounting and clean the burrs and welds.
7. Measure the pipe’s internal diameter (ID), preferably at 1 x ID from
the hole (upstream or downstream).
NOTE
To maintain published flowmeter accuracy, provide the pipe ID when
purchasing the flowmeter.
8. Check the fit-up of the instrument assembly to the pipe.
9. Install the flowmeter.
10. Wire the instrument.
11. Supply power to the flowmeter.
12. Perform a trim for mounting effects.
13. Check for leaks.
14. Commission the instrument
2-3
Rosemount 285
MOUNTING
Tools and Supplies Tools required include the following:
• Open end or combination wrenches (spanners) to fit the pipe fittings
and bolts: 9/16-in., 5/8-in., 7/8-in.
• Adjustable wrench: 15-in. (1½-in. jaw).
• Nut driver: 3/8-in. for vent/drain valves (or 3/8-in. wrench).
• Phillip’s screwdriver: #1.
• Standard screwdrivers: ¼-in., and 1/8-in. wide.
• Pipe wrench: 14-in.
• Wire cutters/strippers
Supplies required include the following:
1
/4-in. tubing (recommended) or 1/4-in. pipe to hook up the electronics to
•
the sensor probe. The length required depends upon the distance
between the electronics and the sensor.
• Fittings including (but not limited to)
• Two tube or pipe tees (for steam or high temperature liquid) and
• Six tube/pipe fittings (for tube)
• Pipe compound or Teflon (PTFE) tape (where local piping codes allow).
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October 2005
Mounting Brackets Mounting bracket for the 951 transmitter will facilitate mounting to a panel or
wall.
Bolt Installation
Guidelines
The following guidelines have been established to ensure a tight flange,
adapter, or manifold seal. Only use bolts supplied with the instrument or sold
by the factory.
The 2024 transmitter is shipped with the coplanar flange installed with four
1.75-in. (44.5 mm) flange bolts. The following bolts also are supplied to
facilitate other mounting configurations:
• Four 2.25-in. (57.2 mm) manifold/flange bolts for mounting the coplanar
flange on a three-valve manifold. In this configuration, the 1.75-in. (44.5
mm) bolts may be used to mount the flange adapters to the process
connection side of the manifold.
• (Optional) If flange adapters are ordered, four 2.88-in. (73.2 mm)
flange/adapter bolts for mounting the flange adapters to the coplanar
flange.
Stainless steel bolts supplied by Emerson Process Management are coated
with a lubricant to ease installation. Carbon steel bolts do not require
lubrication. Do not apply additional lubricant when installing either type of bolt.
Rosemount bolts are identified by the following head markings:
2-4
Rosemount 285
Figure 2-2. Bolts
Carbon Steel Head
Markings (CS)
Reference Manual
00809-0100-4028, Rev AA
October 2005
B7M
Stainless Steel Head
Markings (SST)
316
316
R
B8M
STM
316
316
SW
316
Figure 2-3. Coplanar Mounting
Bolts and Bolting Configurations
for Coplanar Flange.
Instrument Manifolds Figure 2-4 identifies the valves on a 3-valve manifold. Table 2-1 explains the
purpose of these valves.
An instrument manifold is recommended for all installations. A manifold allows
an operator to equalize the pressures prior to the zero calibration of the
electronics as well as to isolate the electronics from the rest of the system
without disconnecting the impulse piping.
Figure 2-4. Valve Identification
for a 3-Valve Manifold
NOTE
Some recently-designed instrument manifolds have a single valve actuator,
but cannot perform all of the functions available on standard 5-valve units.
Check with the manufacturer to verify the functions that a particular manifold
can perform. In place of a manifold, individual valves may be arranged to
provide the necessary isolation and equalization functions.
To P H To P L
ME
MH
2
1
ML
DVLDVH
8900_8900_35A
2-5
Rosemount 285
Table 2-1. Description of
Impulse Valves and
Components
Reference Manual
00809-0100-4028, Rev AA
October 2005
Name Description Purpose
Manifold and Impulse Pipe Valves
PH Primary Sensor – High Pressure Isolates the flowmeter sensor from the
PL Primary Sensor – Low Pressure
DVH Drain/Vent Valve – High Pressure Drains (for gas service) or vents (for
DVL Drain/Vent Valve – Low Pressure
MH Manifold – High Pressure Isolates high side or low side pressure
ML Manifold – Low Pressure
Components
1 Electronics Reads Differential Pressure Isolates
2 Manifold
3 Vent Chambers Collects gases in liquid applications.
4 Condensate Chamber Collects condensate in gas
impulse piping system
liquid or steam service) the DP
electronics chambers
from the process.
and equalizes electronics.
applications.
Straight Run
Requirements
Use the following to aid in determining the straight run requirements
NOTE
• If longer lengths of straight run are available, position the mounting
such that 80% of the run is upstream and 20% is downstream.
• Straightening vanes may be used to reduce the required straight run
length.
• Row 5 in Table 2-2 is to be used if a “through type” valve will remain
open. Row 6 in Table 2-2 applies to gate, globe, plug, and other
throttling valves that are partially opened, as well as control valves.
2-6
Rosemount 285
Table 2-2. Straight Run
Requirements
Reference Manual
00809-0100-4028, Rev AA
October 2005
Upstream Dimensions
Without Vanes With Vanes
In
Out of
Plane
Plane
A
A
A’ C C’
1
8
10
—
—
—
—
8
—
4
4
Dimensions
Downstream
4
4
2
3
4
11
—
23
—
12
—
16
—
28
—
12
—
—
—
8
—
—
8
—
—
8
—
4
—
4
—
4
4
4
4
4
4
4
4
4
4
2-7
Rosemount 285
1
1
Reference Manual
00809-0100-4028, Rev AA
October 2005
Figure 2-5. Mounting
Configuration
Table 1. Minimum straight duct requirements for the 285 Annubar
H
W
H
W
DAMPER
15W
15W
7W
7W
7W
2W
2W
H
2W
W
2W
W
2W
W
Upstream Length Downstream Length
285/15-490028-901
285/15-490029-901
285/15-490030-90
H
285/15-490031-90
H
285/15-490032-901
7W 2W
7W 2W
15W 2W
7W 2W
15W 2W
Direct Mount Horizontal Pipes
Liquid or Steam Applications
Due to the possibility of air getting trapped in the probe, the sensor should
be located according to Figure 2-6 for liquid or steam applications. The
area between 0° and 30° angle should not be used unless full bleeding of
air from the probe is possible.
For liquid applications, mount the side drain/vent valve upward to allow the
gases to vent.
In steam applications, fill the lines with water to prevent the steam from
contacting the electronics. Condensate chambers are not required
because the volumetric displacement of the electronics is negligible.
Air and Gas Applications
Figure 2-6 illustrates the recommended location of the flowmeter in air or
gas applications. The sensor should be located on the upper half of the
pipe, at least 30° above the horizontal line.
For air and gas applications, mount the drain/vent valve downward to allow
liquid to drain.
2-8
Rosemount 285
Reference Manual
00809-0100-4028, Rev AA
October 2005
Figure 2-6. Horizontal Pipe
Applications
Liquid and Steam Gas
120
30°
120°
30°
30
Vertical Pipes
Liquid, Steam, Air, and Gas Applications
Figure 2-7 illustrates the recommended location of the flowmeter in liquid,
air, or gas applications.
The sensor can be installed in any position around the circumference of
the pipe, provided the vents are positioned properly for bleeding or
venting. Vertical pipe installations require more frequent bleeding or
venting, depending on the location.
30
15-490000-901, 15-490001-901
Figure 2-7. Vertical Pipe
Applications
Liquid and Steam Gas
Remote Mount Valves and Fittings
Throughout the remote mounting process:
• Use only valves, fittings, and pipe thread sealant compounds that are
rated for the service pipeline design pressure and temperature as
specified in Appendix A: Reference Data.
• Verify that all connections are tight and that all instrument valves are
fully closed.
• Verify that the sensor probe is properly oriented for the intended type of
service: liquid, gas or steam (see “Direct Mount” on page 2-8 and
“Remote Mount” on page 2-9).
360
FLOW
FLOW
360
15-490002-901,
15-490003-901
2-9
Rosemount 285
Reference Manual
00809-0100-4028, Rev AA
October 2005
Impulse Piping
Impulse piping connects remote mounted electronics to the sensor.
Temperatures in excess of 250 °F (121 °C) at the electronics will damage
electronics components; impulse piping allows service flow temperatures to
decrease to a point where the electronics is no longer vulnerable.
The following restrictions and recommendations apply to impulse piping
location.
• Piping used to connect the sensor probe and electronics must be rated
for continuous operation at the pipeline-designed pressure and
temperature
• Impulse piping that runs horizontally must slope at least 1–in. per foot
(83mm/m).
It must slope downwards (toward the electronics) for liquid and steam
applications.
It must slope up (away from the electronics) for gas applications.
• For applications where the pipeline temperature is below 250 °F (121
°C), the impulse piping should be as short as possible to minimize flow
temperature changes. Insulation may be required.
• For applications where pipeline temperature is above 250 °F (121 °C),
the impulse piping should have a minimum length of 1-ft. (0.30 m) for
every 100 °F (38 °C) over 250 °F (121 °C), which is the maximum
operating electronics temperature. Impulse piping must be uninsulated
to reduce fluid temperature. All threaded connections should be
checked after the system comes up to temperature, because
connections may be loosened by the expansion and contraction
caused by temperature changes.
1
• A minimum of
tubing with a wall thickness of at least 0.035-in. (0.9 mm) is
recommended.
• Outdoor installations for liquid, saturated gas, or steam service may
require insulation and heat tracing to prevent freezing.
• For installations where the electronics are more than 6-ft. (1.8m) from
the sensor probe, the high and low impulse piping must be run together
to maintain equal temperature. They must be supported to prevent
sagging and vibration.
• Threaded pipe fittings are not recommended because they create voids
where air can become entrapped and have more possibilities for
leakage.
• Run impulse piping in protected areas or against walls or ceilings. If the
impulse piping is run across the floor, ensure that it is protected with
coverings or kick plates. Do not locate the impulse piping near high
temperature piping or equipment.
• Use an appropriate pipe sealing compound rated for the service
temperature on all threaded connections. When making threaded
connections between stainless steel fittings, Loctite® PST® Sealant is
recommended.
/4-in. (6.35 mm) outer diameter (OD) stainless steel
2-10
Rosemount 285
Horizontal Pipes Liquid or Steam Applications
Due to the possibility of air getting trapped in the probe, the sensor should be
located according to Figures 2-8 and 2-10 for liquid or steam applications.
The area between 0° and 30° angle should not be used unless full bleeding of
air from the probe is possible.
In steam applications, fill the lines with water to prevent the steam from
contacting the electronics. Condensate chambers are not required because
the volumetric displacement of the electronics is negligible.
Air and Gas Applications
Figure 2-9 illustrates the recommended location of the flowmeter in air or gas
applications. The sensor should be located on the upper half of the pipe, at
least 30° above the horizontal line.
Figure 2-8. Liquid Service
Reference Manual
00809-0100-4028, Rev AA
October 2005
Figure 2-9. Gas Service
30°
30
30°
120°
120
30
2-11
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