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

249W Level Sensor
Instruction Manual
Form 5729
May 2006
9
W8224
Figure 9. Positioning Type 249W Wafer Body on
the Connecting Flange
Mounting the Sensor on the Process
Vessel or Displacer Cage
CAUTION
If inserting the displacer into the
vessel or displacer cage before
attaching to the displacer rod, provide
a means of supporting the displacer to
prevent it from dropping into the
vessel or cage and suffering damage.
Install the sensor wafer body on the vessel or
displacer cage using the following procedure.
You may attach the displacer to the displacer rod
before installing the sensor on the cage or vessel. If
so, attach the displacer to the displacer rod as
described in step 1. If the displacer diameter is small
enough, you may install a long or sectionalized
LOCKING NUTS
DISPLACER SPUD
DISPLACER
STEM
EXTENSION
DISPLACER
STEM
END PIECE
DISPLACER ROD
COTTER SPRING
Figure 10. Displacer and Displacer Rod Connections
displacer through the wafer body after it is positioned
on the connecting flange. In this case, install the
displacer in step 4.
1. Place the seal on the connecting flange. To install
the displacer, insert the displacer in the vessel or
cage. Hold the wafer body above the connecting
flange. Connect the displacer as shown in figure 10,
locking the assembly with the cotter springs
provided. If a stem extension is used between the
displacer spud and the stem end piece, make sure
the nuts are tight at each end of the stem.
2. To position the wafer body on the connecting
flange, insert a stud, with nut, through the
connecting flange and one of the eyelets on the
wafer body, as shown in figure 9. Screw a second
nut onto the top of the stud to hold the wafer body in
place. This second nut may be removed after the top
flange is installed.
3. If you installed the displacer in step 1, go to
step 5, otherwise continue with step 4.
4. If installing a long or sectionalized displacer:
a. Remove the torque tube arm assembly and
displacer rod from the wafer body.
b. Insert the displacer through the wafer body
into the vessel or cage.
c. Reassemble the torque tube arm assembly
and displacer rod to the wafer body.
d. Connect the displacer as shown in figure 10,
locking the assembly with the cotter springs
provided. If a stem extension is used between the
displacer spud and the stem end piece, make
sure the nuts are tight at each end of the stem.

249W Level Sensor
Instruction Manual
Form 5729
May 2006
10
Table 2. Recommended Bolt Torque for Typical Lubricants (3-Inch Flanges)
Bolt and Nut
Material Bolt Size Mating Flange Class
Lubricant
Fisher NCF2(1)
Coating MolykoteR321R LubriplateR
Mag-1
Never-SeezR
Nickel Special
Torque, NSm (lbfSft)
SA193-B7
5/8 - 11
3/4 - 10
3/4 - 10
CL150
CL300
CL600
431±62 (97±14)
667±98 (150±22)
667±98 (150±22)
431±62 (97±14)
667±98 (150±22)
667±98 (150±22)
556±84 (125±19)
845±124 (190 ±28)
845±124 (190±28)
534±80 (120±18)
801±133 (180±30)
801±133 (180±30)
SA193-B7M
5/8 - 11
3/4 - 10
3/4 - 10
CL150
CL300
CL600
431±44 (97±10)
689±71 (155±16)
689±71 (155±16)
431±44 (97±10)
689±71 (155±16)
689±71 (155 ±16)
556±58 (125±13)
890±89 (200±20)
890±89 (200±20)
534±53 (120±12
845±84 (190±19)
845±84 (190±19)
SA193-B8M CL2
5/8 - 11
3/4 - 10
3/4 - 10
CL150
CL300
CL600
Not applicable
418±62 (94±14)
689±102 (155±23)
689±102 (155±23)
534±80 (120±18)
890±133 (200±30)
890±133 (200±30)
511±67 (115±15)
845±124 (190±28)
845±124 (190±28)
1. Torque values for NCF2 without additional lubricant are equal to Molykote 321R
Table 3. Recommended Bolt Torque for Typical Lubricants (4-Inch Flanges)
Bolt and Nut
Material Bolt Size Mating Flange Class
Lubricant
Fisher NCF2(1)
Coating Molykote 321R Lubriplate Mag-1 Never-Seez Nickel Special
Torque, NSm (lbfSft)
SA193-B7
5/8 - 11
3/4 - 10
7/8 - 9
CL150
CL300
CL600
431±62 (97±14)
667±98 (150±22)
1022±102 (230±23)
431±62 (97±14)
667±98 (150±22)
1022±102 (230±23)
556±84 (125±19)
845±124 (190 ±28)
1289±129 (290±29)
534±80 (120±18)
801±133 (180±30)
1222±122 (275±28)
SA193-B7M
5/8 - 11
3/4 - 10
7/8 - 9
CL150
CL300
CL600
431±44 (97±10)
689±71 (155±16)
1022±102 (230±23)
431±44 (97±10)
689±71 (155±16)
1022±102 (230±23)
556±58 (125±13)
890±89 (200±20)
1289±129 (290±29)
534±53 (120±12
845±84 (190±19)
1222±122 (275±28)
SA193-B8M CL2
5/8 - 11
3/4 - 10
7/8 - 9
CL150
CL300
CL600
Not applicable
418±62 (94±14)
689±102 (155±23)
956±96 (255±96)
534±80 (120±18)
890±133 (200±30)
1133±114 (255±26)
511±67 (115±15)
845±124 (190±28)
1111±111 (250±25)
1. Torque values for NCF2 without additional lubricant are equal to Molykote 321R
Note
In the next step, if mounting the wafer
body on a displacer cage and a flange
adaptor is required, install the flange
adaptor instead of the blind flange.
5. Refer to figure 11. Place a second seal on top of
the wafer body. Place a blind flange on the wafer
body so that the holes in the blind flange align with
the holes in the connecting flange.
6. Refer to figure 12. Secure the wafer body
between the blind flange and connecting flange by
inserting the remaining studs and nuts. Tighten the
nuts just enough to hold the wafer body in place.
7. Remove the nut from the stud that was used in
step 2. Reinsert the stud so it passes through the
holes in the blind flange and connecting flange.
Thread the nut back onto the stud.
8. Tighten all nuts in a crisscross fashion to the
torque recommended in tables 2 or 3.
Maintenance
Sensor parts are subject to normal wear and must
be inspected and replaced as necessary. The
frequency of inspection and replacement depends
upon the severity of service conditions.
WARNING
Avoid personal injury or property
damage resulting from the sudden
release of pressure. Before performing
any maintenance procedure:
DAlways wear protective clothing,
gloves, and eyewear.
DRelieve any process pressure in
the process vessel where the Type
249W sensor is installed.
DDrain the process liquid from the
process vessel.

249W Level Sensor
Instruction Manual
Form 5729
May 2006
11
W8225
Figure 11. Blind Flange Installation
DShut off any electrical or
pneumatic input to the controller or
transmitter attached to the Type 249W
sensor and vent any pneumatic supply
pressure.
DUse caution when loosening
flange bolting or pipe plugs.
DRemove the controller or
transmitter from the torque tube arm
(key 2).
Before performing any maintenance
procedure requiring the handling of
the displacer, inspect the displacer
(key 4) to make sure process pressure
or liquids have not penetrated the
displacer.
The displacer in this unit is a sealed
container. If penetrated by process
pressure or liquid, the displacer may
hold pressure or hazardous liquid for
an extended period. A displacer that
has been penetrated by process
pressure or liquid may contain:
Dpressure as a result of being in a
pressurized vessel.
Dliquid that becomes pressurized
due to a change in temperature.
Dliquid that is flammable,
hazardous, or corrosive.
W8227
Figure 12. Type 249W Installation Complete
Sudden release of pressure, contact
with hazardous liquid, fire, or
explosion, which might result in
personal injury or property damage,
can occur if a displacer that is
retaining pressure or process liquid is
punctured, subjected to heat, or
repaired.
Handle the displacer with care.
Consider the characteristics of the
specific process liquid in use.
Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
Note
Except for gaskets (keys 12, 13),
trouble symptoms peculiar to specific
parts are discussed in the following
sections. Each section is specific to
these parts. Regardless of location,
gasket failure is indicated by leakage
in the gasket area. Every time a gasket
is removed, replace it with a new one
upon reassembly.
The procedures below apply to the Type 249W
assembly as shown in figure 14. Refer to figure 14
for key number locations.

249W Level Sensor
Instruction Manual
Form 5729
May 2006
12
Removing the Displacer and Stem
WARNING
Refer to the Maintenance WARNING at
the beginning of this section.
The displacer (key 4) is a sealed container. If the
displacer has been penetrated by process pressure
or liquid, it may hold pressure or hazardous liquid for
an extended period.
Process residue buildup on the displacer and stem
(key 11) may change displacer weight or
displacement. A bent stem or a dented or corroded
displacer can impair performance.
If the displacer rests against the travel stop, appears
to be overweight, or causes output drift or other
output inaccuracies, it may have been penetrated by
process pressure or liquid. Such a displacer may
contain pressure because it was in a pressurized
vessel, may contain process liquid that becomes
pressurized due to a change in temperature, and
may contain process liquid that is flammable or
hazardous.
WARNING
Sudden release of pressure, contact
with hazardous liquid, fire, or
explosion, which may result in
personal injury or property damage,
can occur if a displacer that is
retaining pressure or process liquid is
punctured, subjected to heat, or
repaired.
Handle the displacer with care.
1. Support the sensor body (key 1) and the torque
tube arm (key 2). Remove the bolting that holds the
wafer body to the process vessel or displacer cage.
CAUTION
When removing the sensor from a
process vessel or displacer cage, the
displacer may remain attached to the
displacer rod and be lifted out with the
wafer body (key 1) when the wafer
body is removed. If separating the
displacer and displacer rod before
removing the wafer body, remove the
cotter spring (key 10).
Be careful not to let the displacer slip
and drop into the bottom of the
process vessel or displacer cage, as
displacer damage could result.
2. Carefully remove the sensor. If the displacer
comes out with the sensor, be careful not to damage
the displacer or bend the stem when setting the
sensor down.
3. Follow the procedure for replacing the displacer,
displacer rod assembly, cotter spring, stem end
piece, and displacer spud as necessary.
Replacing the Displacer, Cotter Spring,
Stem End Piece, and Displacer Spud
The cotter spring (key 10), the ball on the displacer
rod/driver assembly (key 5), and the stem end piece
or displacer stem connector (key 6) may be either
too worn for a secure connection or so clogged or
corroded that the displacer does not pivot properly.
Replace these parts, as necessary.
CAUTION
If the displacer is to be disconnected
from the displacer rod before being
removed from the process vessel or
displacer cage, provide a suitable
means of supporting the displacer to
prevent it from dropping into the
vessel or cage and being damaged.
1. After following the proper procedure to remove
the sensor and the displacer from the process vessel
or displacer cage, move the sensor assembly to a
suitable maintenance area. Support the assembly to
avoid damage to the displacer, displacer stem,
displacer rod/driver assembly, and associated parts.
2. To help support the displacer, install the stem
and stem end piece (or a threaded rod) into the 1/4
inch-28 UNF threaded hole in the displacer spud or
stem connector.
3. Reach the cotter spring, displacer spud, ball end
of the displacer rod/driver assembly, stem end piece,
or displacer stem connector as follows:
4. Remove the cotter spring to free the displacer or
stem end piece from the ball end of the displacer
rod/driver assembly. Lift the displacer or stem end
piece from the ball.

249W Level Sensor
Instruction Manual
Form 5729
May 2006
13
5. Replace worn or damaged parts as necessary.
Return the displacer or stem end piece to the
displacer rod/driver assembly. Install the cotter
spring.
6. Install the sensor and controller/transmitter.
Calibrate the controller/transmitter following the
procedures given in the controller/transmitter
instruction manual.
Replacing the Displacer Rod/Driver
Assembly
The ball on the displacer rod/driver assembly (key 5)
may be either too worn for a secure connection or so
corroded that the displacer does not pivot properly.
Replace the displacer rod/driver assembly, if
necessary.
CAUTION
If the displacer is to be disconnected
from the displacer rod/driver assembly
before being removed from the
process vessel or displacer cage,
provide a suitable means of
supporting the displacer to prevent it
from dropping into the vessel or cage
and being damaged.
1. After following the proper procedure to remove
the sensor and the displacer from the process vessel
or displacer cage, move the sensor assembly to a
suitable maintenance area. Support the assembly to
avoid damage to the displacer, displacer stem,
displacer rod assembly, and associated parts.
2. Remove the controller/transmitter and displacer
(key 4). Then, remove the hex nuts (key 20) that
hold the torque tube arm (key 2) to the wafer body
(key 1). Separate the torque tube arm from the wafer
body.
3. Using the proper tool, loosen and then remove
the upper bearing driver bolt (key 8). Lift the
displacer rod/driver assembly from the knife edge of
the driver bearing (key 7). Separate the displacer
rod/driver assembly from the end of the torque tube
assembly (key 3).
4. If necessary, remove the bearing driver by
removing the lower bearing driver bolt. Install a new
bearing driver and bolts.
5. If necessary, replace the displacer rod/driver
assembly and install it on the knife edge of the
bearing driver. Carefully fit the keyed shaft on the
bearing end of the displacer rod into a socket on the
outside of the welded end of the torque tube
assembly.
6. Install the sensor and controller/transmitter.
Calibrate the controller/transmitter following the
procedures given in the controller/transmitter
instruction manual.
Replacing the Torque Tube
Corrosion or leakage through the outer end of the
torque tube is evidence of deterioration in the torque
tube assembly (key 3) or torque tube end gasket
(key 13). Erratic or nonexistent rotary shaft output
may occur if the socket on the inner end of the
torque tube assembly does not engage the bearing
end of the displacer rod/driver assembly (key 5).
1. After following the proper procedure to remove
the sensor and the displacer from the process vessel
or displacer cage, move the sensor assembly to a
suitable maintenance area. Support the assembly to
avoid damage to the displacer, displacer stem,
displacer rod assembly, and associated parts.
2. Remove the controller/transmitter and displacer
(key 4). Then, remove the hex nuts (key 20) that
hold the torque tube arm (key 2) to the wafer body
(key 1). Separate the torque tube arm from the wafer
body.
3. Remove the nuts (key 18) and retaining flange
(key 14) holding the positioning plate (key 15) at the
end of the torque tube arm.
CAUTION
If the displacer is still attached to the
displacer rod at this point, be careful
not to let the torque tube assembly
slip when using the screwdriver
leverage procedure in steps 4 and 6.
Sudden release of the displacer could
cause damage to the displacer or
torque tube assembly.
4. Remove the positioning plate (key 15) by freeing
its two lugs.

249W Level Sensor
Instruction Manual
Form 5729
May 2006
14
W0654-1/IL
W0145-1*/IL
DISPLACER ROD
ASSEMBLY
ROTARY SHAFT
TORQUE TUBE
OUTER TUBE END
POSITIONING PLATE
DRIER BEARING
REMOVAL OR INSTALLATION OF POSITIONING PLATE EXPLODED VIEW OF TORQUE TUBE AND DISPLACER ROD ASSEMBLY
Figure 13. Torque Tube and Displacer Rod Assemblies
The vertical lug fits into a hole in the flange of the
torque tube arm (figure 13). The horizontal lug
(hidden behind the screwdriver in figure 13) fits into
a slot in the outer tube end of the torque tube
assembly (the figure 13 exploded view shows this
lug to the right of the outer tube end).
The positioning plate may be pried away from the
torque tube arm and outer tube end if the displacer
already has been disconnected from the displacer
rod. However, if the displacer is still connected to the
displacer rod, place a screwdriver blade in the slots
of the positioning plate and outer tube end as shown
in figure 13. Slowly turn the positioning plate to
release its lug from the torque tube arm. Then,
carefully turn the plate back to allow the displacer to
come to rest and slip the other lug of the plate from
its slot in the outer tube end.
5. Pull the torque tube assembly and tube end
gasket out of the torque tube arm.
6. Install a new tube end gasket and insert the
torque tube assembly into the torque tube arm as
shown in figure 13. Rotate the torque tube assembly
until its socket mates with the driver member on the
displacer rod assembly and so the outer tube flange
rests against the gasket. With a thumb on the upper
portion of the positioning plate and a screwdriver in
the slots as shown in figure 13, rotate the plate and
press the lug on the plate into the hole in the torque
tube arm.
7. Install the retaining flange and secure it with four
nuts (key 18), being sure to tighten all nuts evenly.
8. Install the sensor and controller/transmitter.
Calibrate the controller/transmitter following the
procedures given in the controller/transmitter
instruction manual.
Replacing the Torque Tube Arm and
Changing the Mounting
Looseness of the driver bearing (key 7), wear on its
knife-edged surface, or a bent, worn, or corroded
displacer rod/driver assembly (key 5) may impair
performance. Be especially sure to check the ball on
the displacer rod.
1. After following the proper procedure to remove
the sensor and the displacer from the process vessel
or displacer cage, move the sensor assembly to a
suitable maintenance area.
CAUTION
Support the sensor assembly to avoid
damage to the displacer, displacer
stem, displacer rod assembly, and
associated parts.
2. Remove the controller/transmitter and displacer
(key 4). Then, remove the hex nuts (key 20) that
hold the torque tube arm (key 2) to the wafer body
(key 1). Separate the torque tube arm from the wafer
body.
3. Follow the proper procedure to remove the torque
tube assembly (key 3).

249W Level Sensor
Instruction Manual
Form 5729
May 2006
15
4. Remove the driver bearing bolts (key 8),
displacer rod/driver assembly (key 5), and driver
bearing (key 7).
Note
Be sure to install the driver bearing so
its knife edge is pointing up when the
torque tube arm is mounted in the
desired orientation. Since changing
the mounting position of the torque
tube arm by 180_will change
controller or transmitter action from
direct to reverse or vice versa,
controller/transmitter action must be
reversed from what it was before the
mounting method was changed.
5. Install the driver bearing (key 7), displacer
rod/driver assembly (key 5), and bearing bolts (key
8) into the torque tube arm (key 2). Install a new arm
gasket (key 12). Install the torque tube arm on the
wafer body and secure it with the proper bolting
(keys 19 and 20).
6. Install the sensor and controller/transmitter.
Calibrate the controller/transmitter following the
procedures given in the controller/transmitter
instruction manual.
Simulation of Process Conditions
for Calibration of Level-TrolR
Controllers 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).

249W Level Sensor
Instruction Manual
Form 5729
May 2006
16
Parts Ordering
Whenever corresponding with your Emerson
Process Management sales office about this
equipment, always mention the sensor serial
number. Each sensor is assigned a serial number
which is stamped on a nameplate (key 21) attached
to the torque tube arm. This same number also
appears on the controller/transmitter nameplate
when a complete controller/transmitter/ sensor unit is
shipped from the factory. When ordering a
replacement part, be sure to include the
11-character part number from the following parts
list.
Note
Use only genuine Fisher replacement
parts. Components that are not
supplied by Emerson Process
Management should not, under any
circumstance be used in any Fisher
instrument. Use of components not
supplied by Emerson Process
Management will void your warranty,
might adversely affect the
performance of the valve, and might
jeopardize worker and workplace
safety.
Determining Displacer Stem Length
When ordering a displacer stem, determine the
displacer stem length from the G dimension in
figure 6 for cage styles 3 and 4. For cage styles 1
and 2, the G dimension is typically 0, because the
displacer is generally suspended from the rod and
driver assembly with no displacer stem required.
The stem length will be the G dimension rounded to
the nearest 1/2-inch increment. For example, if
dimension G is 12.63 inches, round it to 12.5 inches.
Specify a stem length of 12.5 inches. If dimension G
is 9.44 inches, round it to 9.5 inches. Specify a stem
length of 9.5 inches.
Stem lengths can be adjusted approximately ±0.25
inches for a more exact dimension. Stems are
available in 1/2-inch increments from 2 to 54 inches.
Note
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.

249W Level Sensor
Instruction Manual
Form 5729
May 2006
17
19B3127
PARTS NOT SHOWN 23
Figure 14. Type 249W Sensor Construction
Parts List
Key Description Part Number
1 Wafer Body
3-Inch
WCC steel 19B3100X012
CF8M (316 SST) 19B3100X022
4-Inch
LCC steel 19B3128X012
CF8M (316 SST) 19B3128X022
2 Torque Tube Arm
WCC steel 19B3122X012
LCC 19B3122X052
CF8M (316 SST) 19B3122X022
Key Description Part Number
3* Torque Tube Assy(1)
Std wall
N05500 (std w/WCC steel) 1K4493X0012
316 SST (std w/CF8M) 1K4503000A2
N06600 1K4515000A2
N10276 1K4527000A2
Thin wall
N05500 (std w/WCC steel) 1K4495X0012
316 SST (std w/CF8M) 1K4505000A2
N06600 1K4517000A2
N10276 1K4529000A2
Heavy wall
N05500 (std w/WCC steel) 1K4497X0012
316 SST (std w/CF8M) 1K4541000A2
N06600 1P8662X0012
N10276 1K453140152
*Recommended spare parts
1. This part is available in a wide variety of materials of construction, part
dimensions, or other specifications. Listed here are standard or typical materials,
dimensions, or specifications. Contact your Emerson Process Management sales
office for assistance in selection of specific materials, dimensions, or specifications.

249W Level Sensor
Instruction Manual
Form 5729
May 2006
18
Key Description Part Number
4 Displacer(1)
2-3/8 x 14 inches (62 cubic inches)
3.75 pounds (1400 psi)
S30400 15A4547X042
S31600 15A4547X052
4.75 pounds (1400 psi)
S30400 15A3848X012
S31600 15A3848X022
3 x 14 inches (99 cubic inches)
4.75 pounds (1600 psi)
S30400 15A4547X042
S31600 15A4547X052
2 x 24 inches (75 cubic inches)
3.75 pounds (1480 psi)
S31600 1V498238092
4.75 pounds (1450 psi)
S30400 11A8404X012
2-3/8 x 24 inches (106 cubic inches)
4.75 pounds (1400 psi)
S30400 1J3750X0012
S31600 1J3750000A2
1-1/2 x 32 inches (57 cubic inches)
3.75 pounds
S30400 (1800 psi) 15A4556X082
S31600 (1300 psi) 15A4556X022
4.75 pounds
S31600 (1300 psi) 15A4556X052
2 x 32 inches (100 cubic inches)
S30400 (1500 psi) 4.75 pounds 15A4586X012
1-1/4 inch x 48 inches (59 cubic inches)
S30400 (1800 psi) 3.75 pounds 15A4675X022
1-1/2 x 48 inches (85 cubic inches)
3.75 pounds (1300 psi)
S31600 15A5014X112
4.75 pounds (1300 psi)
S31600 15A5014X022
1-5/8 x 48 inches (99 cubic inches)
S31600 (1800 psi) 3.75 pounds 15A5007X022
1-1/8 x 60 inches (60 cubic inches)
3.75 pounds
S30400 (1600 psi) 15A5018X022
S31600 (2100 psi) 15A5018X012
1-1/2 x 60 inches (106 cubic inches)
4.75 pounds
S30400 (1800 psi) 15A5017X042
S31600 (1300 psi) 15A5017X022
1-1/8 x 72 inches (72 cubic inches)
3.75 pounds (1600 psi)
S30400 13A3343X032
S31600 13A3343X012
1-3/8 x 72 inches (107 cubic inches)
4.75 pounds (1400 psi)
S30400 1C1658000A2
S31600 1C1658X00A2
1 x 84 inches (66 cubic inches)
3.75 pounds (1400 psi)
S30400 15A5107X022
S31600 15A5107X032
1-1/4 x 84 inches (103 cubic inches)
4.75 pounds (1800 psi)
S30400 15A5104X042
S31600 15A5104X052
Key Description Part Number
4 Displacer(1) (cont’d)
1-1/8 x 96 inches (95 cubic inches)
4.75 pounds
S30400 (1570 psi) 15A5102X042
S31600 (2100 psi) 15A5102X052
1-1/8 x 108 inches (107 cubic inches)
4.75 pounds (1600 psi)
S30400 1C1688000A2
S31600 1C1688000B2
1 x 120 inches (94 cubic inches)
4.75 pounds (1400 psi)
S30400 15A5646X032
S31600 15A5646X062
5 Rod/Driver Assy
S31600 1B5461000A2
N05500 1B5461000C2
N10276 1B5461X0022
6 Displacer Stem End Piece
S31600 1A393335072
N05500 1A393340012
N10276 1A393340152
7 Driver Bearing
S31600 1K539536042
N05500 1K539541012
N10276 1K539539072
8 Driver Bearing Bolt (2 req’d)
S31600 1K539435072
N05500 1K539440012
N10276 1K539440152
9 Hex Nut (2 req’d)
S31600 1A391535252
N05500 1A391540012
N10276 1A391540152
10* Cotter Spring (2 req’d)
N04400 1A517942022
N10276 1A517940152
11 Displacer Stem
When ordering a replacement displacer stem,
specify length and desired material.
12* Arm Gasket
Graphite/SST 1E5629X0072
N04400/PTFE 10B6639X012
13* Tube End Gasket(1)
Graphite/SST 0Y0876X0052
N04400/PTFE 13B8741X012
14 Retaining Flange
For SA-193 B7 and B7M bolting 1B532025032
For SA-193 B8M bolting 1B5320X0052
15 Positioning Plate, zn pl steel 1B812325082
16 Groove Pin, plated steel 1A361828992
17 Stud Bolt(1) (4 req’d)
For SA-193 B7 bolting 17B1392X082
For SA-193 B7M bolting 17B1392X092
For SA-193 B8M bolting 17B1392X032
18 Hex Nut(1) (4 req’d)
For SA-193 B7 bolting 1A3773X0332
For SA-193 B7M bolting 1A3773X0342
For SA-193 B8M bolting 1A377335252
*Recommended spare parts
1. This part is available in a wide variety of materials of construction, part
dimensions, or other specifications. Listed here are standard or typical materials,
dimensions, or specifications. Contact your Emerson Process Management sales
office for assistance in selection of specific materials, dimensions, or specifications.