Fisher 249W Manual

Errata Sheet
for
The following Instruction Manuals
Instruction Manual Title Form Number Date
Caged 249 Series Displacer Sensors 1802 May 2003
Type 249W Cageless Wafer Style Level Sensor 5729 March 2005
This errata sheet provides updated information
(refer to table 1) on displacer and torque tube
materials and information regarding simulation of
process conditions for calibration of Level-TrolR
controllers and transmitters.
Table 1. Displacer and Torque Tube Materials
Part Standard Material Other Materials
Displacer 304 Stainless Steel
316 Stainless Steel,
N10276, N04400,
Plastic, and Special
Alloys
Displacer Stem,
Driver Bearing,
Displacer Rod and
Driver
316 Stainless Steel
N10276, N04400,
other Austenitic
Stainless Steels, and
Special Alloys
Torque Tube N05500(1) 316 Stainless Steel,
N06600, N10276
1. N05500 is not recommended for spring applications above
232_C (450_F). Contact your Emerson Process Managementt
sales office or application engineer if temperatures exceeding this
limit are required.
Simulation of Process Conditions for Calibration
of Level-TrolRControllers and Transmitters
Contact your Emerson Process Management sales
office for information on obtaining the Supplement to
249 Series Sensors Instruction Manual: Simulation of
Process Conditions for Calibration of Level-Trols -
Form 5767 (part number D103066X012).
Note
Neither EmersonR, Emerson Process
Management, FisherR, nor any of their
affiliated entities assumes
responsibility for the selection, use,
and maintenance of any product.
Responsibility for the selection, use,
and maintenance of any product
remains with the purchaser and
end-user.
Errata Sheet
January 2006 2500-249 Series

2500-249 Series Errata Sheet
January 2006
2
Fisher
Marshalltown, Iowa 50158 USA
Cernay 68700 France
Sao Paulo 05424 Brazil
Singapore 128461
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are
not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability.
We reserve the right to modify or improve the designs or specifications of such products at any time without notice.
Neither Emerson, Emerson Process Management, Fisher, nor any of their affiliated entities assumes responsibility for the selection, use, and
maintenance of any product. Responsibility for the selection, use and maintenance of any product remains with the purchaser and end user.
EFisher Controls International LLC 2005, 2006; All Rights Reserved Printed in USA
Level-Trol and Fisher are marks owned by Fisher Controls International LLC, a member of the Emerson Process Management business division of
Emerson Electric Co. Emerson, Emerson Process Management, and the Emerson logo are trademarks and service marks of Emerson Electric Co.
All other marks are the property of their respective owners.
Emerson Process Management
www.Fisher.com

www.Fisher.com
D102803X012
Type 249W Cageless Wafer Style Level Sensor
Contents
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scope of Manual 1. . . . . . . . . . . . . . . . . . . . . . . . . .
Description 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Type Number Description 2. . . . . . . . . . . . . . . . . .
Educational Services 3. . . . . . . . . . . . . . . . . . . . . .
Installation 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation on Top of Vessel 4. . . . . . . . . . . . . . . .
Installation with Displacer Cage
on Side of Vessel 4. . . . . . . . . . . . . . . . . . . . . . .
Mounting the Sensor on the Process
Vessel or Displacer Cage 5. . . . . . . . . . . . . . . .
Maintenance 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Displacer and Stem 12. . . . . . . . . .
Replacing the Displacer, Cotter Spring,
Stem End Piece, and Displacer Spud 12. . . . .
Replacing the Displacer Rod/Driver Assembly 13
Replacing the Torque Tube 13. . . . . . . . . . . . . . . .
Replacing the Torque Tube Arm and
Changing the Mounting 14. . . . . . . . . . . . . . . . .
Simulation of Process Conditions for Calibration
of Level-TrolRControllers and Transitters 15. .
Parts Ordering 16. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Determining Displacer Stem Length 16. . . . . . . .
Parts List 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction
Scope of Manual
This instruction manual includes maintenance, and
parts ordering information for the Type 249W
cageless wafer style sensor.
Although the sensor is usually shipped with attached
controller or transmitter, as shown in figure 1, this
manual does not include operation, installation,
calibration, maintenance, and parts ordering
information for the controller/transmitter or for the
complete unit. For this information, refer to the
appropriate controller/ transmitter instruction manual.
W8231 / IL
Figure 1. Type 249W Sensor with DLC3000 Series
Digital Level Controller
No person may install, operate, or maintain a Type
249W sensor and the attached controller or
transmitter without first Dbeing fully trained and
qualified in valve, actuator, and accessory
installation, operation and maintenance, and D
carefully reading and understanding the contents of
this manual. If you have any questions concerning
these instructions, contact your Emerson Process
Managementtsales office before proceeding.
Description
The Type 249W sensor is designed to measure
liquid level, interface level, or density/specific gravity
inside a process vessel.
A torque tube assembly (figure 3) and displacer
provide an indication of liquid level, interface level, or
density/specific gravity. The torque tube assembly
consists of a hollow torque tube with a shaft welded
inside it at one end and protruding from it at the
other end.
Instruction Manual
Form 5729
May 2006 249W Level Sensor

249W Level Sensor
Instruction Manual
Form 5729
May 2006
2
W8150 / IL
CONTROLLER OR TRANSMITTER
(TYPE DLC3010 SHOWN)
RETAINING
FLANGE
POSITIONING
PLATE GASKET TORQUE TUBE
ARM
ROTARY SHAFT
OUTER
TUBE
END
MOUNTING HOLES ACCEPT
FOUR STUDS OR CAP
SCREWS DEPENDING ON
CONTROLLER OR TRANSMITTER
HEX NUTS OR CAP SCREWS
DEPENDING ON CONTROLLER
OR TRANSMITTER
Figure 2. Torque Tube Arm Exploded View Showing Controller or Transmitter Mounting
The unconnected end of the tube is sealed by a
gasket and clamped rigidly to the torque tube arm,
permitting the protruding end of the shaft to twist and
therefore transmit rotary motion. This allows the
interior of the torque tube to remain at atmospheric
pressure, thus eliminating packing and the
disadvantages of packing friction.
The displacer always exerts a downward force on
one end of the displacer rod. The other end of the
displacer rod rests on the knife-edge of the driver
bearing. A keyed shaft on the bearing end of the
displacer fits into a socket on the outside of the
welded end of the torque tube assembly.
A change in liquid level, interface level, or
density/specific gravity buoys up the displacer by a
force equal to the weight of the liquid displaced.
Corresponding vertical movement of the displacer
results in angular movement of the displacer rod
around the knife edge. Since the torque tube
assembly is a torsional spring which supports the
displacer and determines the amount of movement
of the displacer rod for a given displacement
change, it will twist a specific amount for each
increment of buoyancy change. This rotation is
brought through the torque tube arm by the
protruding rotary shaft. A controller or transmitter
attached to the end of the rotary shaft converts the
rotary motion into varying pneumatic or electric
signals. Figure 2 shows how the controller or
transmitter mounts on the torque tube arm.
Unless otherwise noted, all NACE references are to
NACE MR0175−2002.
KNIFE EDGE
BEARING
DISPLACER ROD
W1800-1*/IL
W8325
DISPLACER
TORQUE TUBE
Figure 3. Typical Cageless Displacer
Type Number Description
DType 249W—3- or 4-inch, ANSI Class 150,
300, 600 steel cageless sensor.
The Parts List section shows some Type 249W
constructions, standard displacer lengths, and
standard materials, and table 1 contains materials of
construction. However, Type 249W parts are
available in a wide variety of materials of
construction, part dimensions, and other
specifications. Contact your Emerson Process
Management sales office for assistance in selection
of specific materials, dimensions, and specifications.

249W Level Sensor
Instruction Manual
Form 5729
May 2006
3
Table 1. Materials of Construction
Part Standard Material Other Materials
Wafer Body and
Torque Tube Arm
WCC (NACE
MR0175 compliant) 316 Stainless Steel
Displacer 304 Stainless Steel
316 Stainless Steel,
N10276, N04400,
Plastic, and Special
Alloys
Displacer Stem,
Driver Bearing,
Displacer Rod and
Driver
316 Stainless Steel
N10276, N04400,
other Austenitic
Stainless Steels, and
Special Alloys
Torque Tube N05500(1) 316 Stainless Steel,
N06600, N10276
Bolting
NCF coated steel
grade B7 studs or
cap screws and
grade 2H nuts
Steel Grade B7M or
M8M studs and grade
2M nuts
Torque Tube Arm
Gasket and Torque
Tube End Gasket
Graphite/Stainless
Steel N04400/PTFE
1. N05500 is not recommended for spring applications above
232_C (450_F). Contact your Emerson Process Management
sales office or application engineer if temperatures exceeding this
limit are required.
Educational Services
For information on available courses for Type 249W
level sensors, as well as a variety of other products,
contact:
Emerson Process Management
Educational Services, Registration
P.O. Box 190; 301 S. 1st Ave.
Marshalltown, IA 50158−2823
Phone: 800−338−8158 or
Phone: 641−754−3771
FAX: 641−754−3431
e-mail: [email protected]
Note
Neither EmersonR, Emerson Process
Management, FisherR, nor any of their
affiliated entities assumes
responsibility for the selection, use,
and maintenance of any product.
Responsibility for the selection, use,
and maintenance of any product
remains with the purchaser and
end-user.
TYPE 249W WAFER BODY
3- OR 4−INCH
RF FLANGE
DISPLACER
STILLWELL
1
1
NOTE:
STILLWELL REQUIRED AROUND DISPLACER IF THE FLUID
IS IN A STATE OF CONTINUOUS AGITATION
W8266 / IL
Figure 4. Type 249W Sensor Top Mounted on Vessel
Installation
WARNING
To avoid personal injury or property
damage resulting from the sudden
release of pressure:
DAlways wear protective clothing,
gloves, and eyewear when performing
any installation operations to avoid
personal injury.
DCheck with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
DIf installing into an existing
application, also refer to the WARNING
at the beginning of the Maintenance
section of this instruction manual.
The Type 249W sensor can be installed directly on
the vessel as shown in figure 4. It also can be
installed in a user fabricated cage mounted on the

249W Level Sensor
Instruction Manual
Form 5729
May 2006
4
CAGE WITH TOP AND BOTTOM CONNECTIONS CAGE WITH SIDE CONNECTIONS
W8268 / IL
W8267 / IL
Figure 5. Type 249W Sensor Cage-Mounted on Side of Vessel
side of the vessel as shown in figure 5. The sensor
mounts on the top of the vessel or in the displacer
cage using a 3-inch raised face flange with the
3-inch 249W wafer body, or a 4-inch raised-face
flange with the 4-inch 249W wafer body.
Installation on Top of Vessel
Note
If a stillwell is used, install it plumb so
that the displacer does not touch the
wall of the stillwell. If the displacer
touches the wall, the unit will transmit
an erroneous output signal.
Because the displacer hangs inside the vessel,
provide a stillwell around the displacer if the fluid is
in a state of continuous agitation to avoid excessive
turbulence around the displacer.
To attach the sensor body to the vessel requires a
flanged connection on the vessel as shown in figure
4. For interface or fluid level applications, install a
gauge glass on the vessel.
Installation with Displacer Cage on
Side of Vessel
Note
Install the cage so that it is plumb; the
displacer must not touch the cage
wall. If the displacer touches the cage
wall, the unit will transmit an
erroneous output signal.
Figure 5 shows the Type 249W sensor mounted on
the side of a vessel using a displacer cage. Figure 6
provides the Type 249W dimensions required to
fabricate a cage. Figure 7 provides overall envelope

249W Level Sensor
Instruction Manual
Form 5729
May 2006
5
dimensions for Type 249W sensor and DLC3000
Series controller, and figure 8 provides overall
envelope dimensions for Type 249W and 2500
Series controller or transmitter.
When fabricating the cage, maintain a minimum
clearance of 1/4-inch between the displacer and the
cage wall. Dirty or viscous fluids may require a larger
clearance. Provide sufficient cage length below the
displacer to ensure that the displacer does not hit
the bottom of the cage. The A dimension should be
sufficient to permit adequate clearance for
installation and to allow access to isolation valves,
etc. When installing the cage, it must be vertically
plumb so that the displacer does not strike the side
of the cage.
As shown in figure 5, mount the cage by running
equalizing lines between the cage connections and
the vessel. A shutoff or hand valve with a 1-1/2 inch
diameter or larger port should be installed in each of
the equalizing lines. Also install a drain between the
cage and shutoff or hand valve whenever the bottom
cage line has a fluid-trapping low point.On fluid or
interface level applications, position the displacer
cage so that the cage center is as close as possible
to the center of the fluid level or interface level range
being measured. Also consider installing a gauge
glass on the vessel, or on the displacer cage.

249W Level Sensor
Instruction Manual
Form 5729
May 2006
6
STYLE 1
CAGE WITH TOP AND
BOTTOM VESSEL CONNECTIONS
STYLE 3
CAGE WITH UPPER AND
LOWER SIDE VESSEL CONNECTIONS
STYLE 2
CAGE WITH TOP AND
LOWER SIDE VESSEL CONNECTIONS
STYLE 4
CAGE WITH UPPER SIDE AND
BOTTOM VESSEL CONNECTIONS
3- OR 4-INCH CLASS 150, 300,
OR 600 FLANGE
G
G
NOTES:
1 DIMENSION G IS CUSTOMER SPECIFIED.
G
G
356 mm
(14-INCHES)
GE06685
GE06687
GE06688
GE06686
1
1
1
1
2. VESSEL CONNECTIONS ARE EITHER 1-1/2 OR 2-INCH CLASS 150, 300
OR 600 FLANGES. (VESSEL ENDS CAN BE ALSO SCREWED OR SOCKET
WELDED CONNECTIONS).
3. DISPLACER LENGTH ILLUSTRATED IS 14-INCHES.
4. CONNECTIONS SHOWN ILLUSTRATE TYPE DLC3000. CONNECTIONS
ARE ALSO APPLICABLE TO THE 2500 SERIES.
Figure 6. Typical Cage Connections

249W Level Sensor
Instruction Manual
Form 5729
May 2006
7
RIGHT HAND MOUNT
LEFT HAND MOUNT
507
(19.75)
204
(8.04)
507
(19.75)
127
(5.00)
157
(6.19)
73
(2.87)
D
D
jj
1/2 −14 NPT
2 PLACES
mm
(INCH)
356
(14.00)
G
MATCHES 3-INCH
RAISED-FACE FLANGE
MATCHES 4-INCH
RAISED-FACE FLANGE
73
(2.87)
204
(8.04)
G
356
(14.00)
127
(5.00)
MATCHES 3-INCH
RAISED-FACE FLANGE
157
(6.19)
MATCHES 4-INCH
RAISED-FACE FLANGE
59
(2.34)
139
(5.49)
59
(2.34)
66
(2.61)
10C0786-B / IL
610
(24.00)
HEAT INSULATOR
EXTENSION
1
1
D
3-INCH
4-INCH
mm INCH
2.38
3.00
60
76
WAFER-STYLE
SENSOR SIZE
NOTES:
1 DIMENSION G IS CUSTOMER SPECIFIED
2. DISPLACER LENGTH ILLUSTRATED IS 14-INCHES
Figure 7. Overall Envelope Dimensions for Type 249W / DLC3000 for Mounting on Customer Supplied Cage

249W Level Sensor
Instruction Manual
Form 5729
May 2006
8
239
(9.41)
232
(9.12)
417
(16.40)
98
(3.88)
318
(12.51)
98
(3.88)
417
(16.40)
203
(8.00)
328
(12.90)
203
(8.00)
157
(6.19)
MATCHES 4-INCH
RAISED-FACE FLANGE
356
(14.00)
G
356
(14.00)
mm
(INCH)
D
D
MATCHES 3-INCH
RAISED-FACE FLANGE
MATCHES 3-INCH
RAISED-FACE FLANGE
73
(2.87)
73
(2.87)
127
(5.00)
127
(5.00)
LEFT-HAND MOUNT RIGHT-HAND MOUNT
G
D
3-INCH
4-INCH
mm INCH
2.38
3.00
60
76
WAFER-STYLE
SENSOR SIZE
MATCHES 4-INCH
RAISED-FACE FLANGE
157
(6.19)
GE06028-A / IL
NOTES:
1 DIMENSION G IS CUSTOMER SPECIFIED
11
2. DISPLACER LENGTH ILLUSTRATED IS 14-INCHES
Figure 8. Overall Envelope dimensions for Type 249W / 2500 for Mounting on Customer Supplied Cage