Data Sheet

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Fisherr 2500‐249 Pneumatic Controllers and

Transmitters

Typical caged and cageless sensor/instrument

configurations are shown below and in figure 1. Caged

sensors (figure 2) provide more stable operation than

do cageless sensors (figure 3) for vessels with internal

obstructions or considerable internal turbulence.

Cageless sensors are generally used on specific gravity

and interface control applications requiring large

displacers that are more easily accommodated by

flange connections up to NPS 8. The availability of

many different displacer stem lengths permits

lowering the displacer down to the most

advantageous depth in the vessel.

Fisher pneumatic controllers and transmitters are used

wherever rugged, dependable, and simply constructed

displacer‐style pneumatic instrumentation is required

in liquid level, interface level, or density service. The

ruggedness of these products is demonstrated by their

use in many kinds of demanding applications,

including those in the power, chemical process, oil and

gas production, and petrochemical industries.

STANDARD CAGED SENSORS

MOUNT ON VESSEL SIDE WITH

DISPLACER INSIDE CAGE

W8334

W9354‐1

FISHER L3 PNEUMATIC LEVEL CONTROLLER

(2500 CONTROLLER IN COMBINATION WITH A

249W SENSOR) CAN MOUNT ON VESSEL TOP OR

BE INSTALLED IN A CUSTOMER‐SUPPLIED CAGE

W8679

CAGELESS SENSORS CAN MOUNT

ON VESSEL SIDE OR TOP WITH

DISPLACER INSIDE VESSEL

2500-249 Controllers and Transmitters

D200037X012

Product Bulletin

34.2:2500

July 2012

Summary of content (16 pages)

PAGE 1
Product Bulletin 2500-249 Controllers and Transmitters 34.2:2500 July 2012 D200037X012 Fisherr 2500‐249 Pneumatic Controllers and Transmitters Typical caged and cageless sensor/instrument configurations are shown below and in figure 1. Caged sensors (figure 2) provide more stable operation than do cageless sensors (figure 3) for vessels with internal obstructions or considerable internal turbulence.
PAGE 2
Product Bulletin 2500-249 Controllers and Transmitters 34.
PAGE 3
Product Bulletin 2500-249 Controllers and Transmitters 34.
PAGE 4
Product Bulletin 2500-249 Controllers and Transmitters 34.2:2500 July 2012 D200037X012 Table 1.
PAGE 5
Product Bulletin 2500-249 Controllers and Transmitters 34.2:2500 July 2012 D200037X012 Table 4. Supply Pressure Data OUTPUT SIGNAL 0.2 to 1.0 bar (3 to 15 psig), except 0 and 1.4 bar (0 and 20 psig)(2) for on‐off controllers 0.4 to 2.0 bar (6 to 30 psig), except 0 and 2.
PAGE 6
Product Bulletin 2500-249 Controllers and Transmitters 34.2:2500 July 2012 D200037X012 Figure 1.
PAGE 7
Product Bulletin 2500-249 Controllers and Transmitters 34.2:2500 July 2012 D200037X012 Figure 2. Fisher 249B Caged Sensor (Typical of all Rotatable‐Head Caged Sensors) Figure 3.
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Product Bulletin 2500-249 Controllers and Transmitters 34.2:2500 July 2012 D200037X012 Table 5.
PAGE 9
Product Bulletin 2500-249 Controllers and Transmitters 34.2:2500 July 2012 D200037X012 Table 7. Construction Materials Part In contact with process Cage, head, torque tube arm Sensor Cast iron 249B, 249BF(1) Carbon steel 249C and 249CP 249L CF8M (316 stainless steel) standard, CF3M (316L stainless steel), CF8 (304 stainless steel), CF3 (304L stainless steel), LCC (steel), C5 (steel), LC3 (3.
PAGE 10
Product Bulletin 2500-249 Controllers and Transmitters 34.2:2500 July 2012 D200037X012 Figure 5.
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Product Bulletin 2500-249 Controllers and Transmitters 34.2:2500 July 2012 D200037X012 Figure 6.
PAGE 12
Product Bulletin 34.2:2500 July 2012 Anti‐Reset Windup 2502F and 2502FR controllers additionally have anti‐reset windup to minimize the delay in returning the controlled variable to the set point. This capability is provided by a reversible differential relief valve with adjustable spring. As shown in figure 6, proportional pressure registers rapidly on the spring side of the relief valve diaphragm as well as in the proportional bellows.
PAGE 13
Product Bulletin 2500-249 Controllers and Transmitters 34.2:2500 July 2012 D200037X012 Figure 7.
PAGE 14
Product Bulletin 2500-249 Controllers and Transmitters 34.2:2500 July 2012 D200037X012 Figure 9. Torque Tube Arm Mounting Positions RIGHT-HAND SENSOR LEFT-HAND CAGED CAGELESS Not availalable for NPS 2 CL300 and 600 249C. Figure 10.
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Product Bulletin 2500-249 Controllers and Transmitters 34.
PAGE 16
Product Bulletin 34.2:2500 July 2012 2500-249 Controllers and Transmitters D200037X012 Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user. Fisher is a mark owned by one of the companies in the Emerson Process Management business unit of Emerson Electric Co.