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Fisher 249 Series, Instruction Manual

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Fisher 249 Series Instruction Manual Download Page 15

Instruction Manual

D200099X012

249 Caged Sensors

April 2017

15

Figure 9. Fisher 249B Sensor Construction

30A1914‐D

30A1915‐C

DETAIL OF STYLE 1 OR 2 CONNECTIONS

SECTION A‐A

Key

Description

12*

Ring (Iron gasket)

249L only

13*

Arm Gasket

(1)

249, 249B, and 249C

  

Graphite‐stainless steel

249K, composition‐stainless steel

13*

Ring (Iron gasket)
249L only

14*

Tube End Gasket

(1)

249, 249B, 249C, 249K, and 249L
Graphite‐stainless steel

14*

Outer End Gasket

(1)

For 249L

  

Graphite‐stainless steel

15

Stud Bolt

(1)

 (4 req'd)

 249 and 249B, Steel B7
249C, Steel B7
249K and 249L, Steel B7

Key

Description

16

Groove Pin, S31600

Notes

For key 17 see figure 5: Two styles of vessel/cage connections are
available: screwed (S) and flanged (F). Four connection configurations
are available:
 

  1, top and bottom of cage

 

  2, top and lower side of cage

 

  3, side of cage only

 

  4, upper side and bottom of cage

Styles 1, 2, 3, 4 refer to either screwed or flanged. Styles S1, S2, S3, S4
refer to screwed connections. Styles F1, F2, F3, F4 refer to flanged
connections.

*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 sales office for assistance in selection of specific materials, dimensions,
or specifications.

Summary of Contents for 249 Series

Page 1: ...l includes maintenance and parts ordering information for 249 caged sensors Although a 249 sensor is usually shipped with attached controller or transmitter 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...

Page 2: ... level or density specific gravity inside a 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 Figure 2 Rod and Block Shipping Lock SHIPPING BLOCK LOCK NUT SHIPPING STOP ROD LOC...

Page 3: ...is 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 4 shows how the controller or transmitter mounts on the torque tube arm Unless otherwise noted all NACE references are to NACE MR0175 2002 Figure 4 Torque Tube Arm Exploded ...

Page 4: ...ducational Services Registration Phone 1 641 754 3771 or 1800 338 8158 e mail education emerson com http www emerson com en us automation services consulting educational services 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 Always wear protectiv...

Page 5: ...very time a gasket is removed replace it with a new one upon reassembly The procedures below apply to all sensor types except where indicated Key numbers used are shown in the following illustrations 249 figure 8 249B figure 9 249C figure 10 249K figure 11 249L figure 12 Cleaning the Cage Process residue buildup in the bottom of the cage key 1 or at the connections may restrict flow in and out of ...

Page 6: ...mper key 29 If necessary completely remove the cage from the vessel Figure 5 Cage Connection Styles A1271 2 STYLE 1 TOP AND BOTTOM STYLE 2 TOP AND LOWER SIDE STYLE 3 UPPER AND LOWER SIDE STYLE 4 UPPER SIDE AND BOTTOM SCREWED S3 FLANGED F3 SCREWED S2 FLANGED F2 SCREWED S1 FLANGED F1 SCREWED S4 FLANGED F4 6 Use appropriate cleaning techniques tools and solutions After cleaning the cage install the l...

Page 7: ...he cage the displacer may remain attached to the displacer rod and be lifted out with the cage head key 2 when the cage head is removed If separating the displacer and displacer rod drive assembly key 9 before removing the cage head remove the cotter spring key 11 Be careful not to let the displacer slip and drop into the bottom of the cage as displacer damage could result 3 When removing the sens...

Page 8: ...anual Install the cage head and controller transmitter Properly 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 7 may be either too worn for a secure connection or so corroded that the displacer does not pivot properly Replace the displa...

Page 9: ...placer rod assembly and so that the outer tube flange rests against the gasket 11 With a thumb on the upper portion of the positioning plate and a screwdriver in the slots as shown in figure 6 rotate the plate and press the lug on the plate into the hole in the torque tube arm this will preload the torque tube 12 Install the retaining flange and secure it with four nuts key 18 being sure to tighte...

Page 10: ...rod place a screwdriver blade in the slots of the positioning plate and outer tube end as shown in figure 6 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 torqu...

Page 11: ...e plugs Be sure process pressure or liquids have not penetrated the displacer 2 Remove the hex nuts keys 20 or 22 from the bolting key 21 and reposition the head as desired Replacing the Torque Tube Arm and Changing the Mounting 1 Looseness of the driver bearing key 4 wear on its knife edged surface or a bent worn or corroded displacer rod assembly key 7 may impair performance Be especially sure t...

Page 12: ...ontroller transmitter instruction manual Simulation of Process Conditions for Calibration of Fisher Level Controllers and Transmitters Contact your Emerson sales office or Local Business Partner for information on obtaining the Supplement to 249 Sensor Instruction Manuals Simulation of Process Conditions for Calibration of Fisher Level Controllers and Transmitters D103066X012 or visit our website ...

Page 13: ...g Bolt 1 S31600 2 req d 6 Retaining Flange see above note Key Description 7 Rod Driver Assy 1 S31600 stainless steel SST 249 and 249B 249C Standard wall torque tube Heavy wall torque tube 249K 249L 8 Positioning Plate Steel 9 Torque Tube Assy 1 249 and 249B N05500 Standard wall Thin wall Heavywall 249C S31600 Standard wall Heavy wall 249K and 249L N05500 Standard wall Thin wall 10 Displacer 1 249 ...

Page 14: ...Instruction Manual D200099X012 249 Caged Sensors April 2017 14 Figure 8 Fisher 249 Sensor Construction 30A1913 B 30A7422 B SECTION A A DETAIL OF CL250 S2 S3 OR S4 CONNECTIONS ...

Page 15: ...escription 16 Groove Pin S31600 Notes For key 17 see figure 5 Two styles of vessel cage connections are available screwed S and flanged F Four connection configurations are available 1 top and bottom of cage 2 top and lower side of cage 3 side of cage only 4 upper side and bottom of cage Styles 1 2 3 4 refer to either screwed or flanged Styles S1 S2 S3 S4 refer to screwed connections Styles F1 F2 ...

Page 16: ... 249K and 249L steel B7 19 Cap Screw 1 steel B7 4 req d For 249 CL125 CL250 Key Description 19 Bolt Stud 1 steel B7 4 req d For 249B 249C For 249K 20 Hex Nut 1 steel For 249 CL125 12 req d CL250 4 req d For 249B 249C 8 req d For 249K 8 req d For 249L 4 req d 1 This part is available in a wide variety of materials of construction part dimensions or other specifications Listed here are standard or t...

Page 17: ...Key Description 22 Hex Nut 1 steel For 249 CL250 8 req d For 249B 16 req d For 249C 8 req d For 249K 8 req d For 249L 16 req d 23 Displacer Stem End Piece 1 S31600 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 sales office for assistance ...

Page 18: ...2 S3 S4 2 req d 2 NPT style S2 S3 S4 For 249B steel styles S3 S4 For 249C S31600 styles S3 S4 For 249K steel styles S3 S4 27 Pipe Plug 2 req d For 249 cast iron CL125 CL250 For 249B steel 29 Liquid Damper 1 S30400 NPS 1 1 2 connection NPS 2 connection 30 Blind Flange 1 For 249L 31 Ring 1 Iron gasket For 249L 32 Stud Bolt 1 steel B7 4 req d For 249L 33 Hex Nut 1 steel 4 req d For 249L 35 Heat Insul...

Page 19: ...Instruction Manual D200099X012 249 Caged Sensors April 2017 19 Figure 12 Fisher 249L Sensor Construction 50A7430 C SECTION A A ...

Page 20: ... which are available upon request We reserve the right to modify or improve the designs or specifications of such products at any time without notice 1976 2017 Fisher Controls International LLC All rights reserved Fisher is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co Emerson Automation Solutions Emerson and the Emerson logo are trad...

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