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Fisher
™
249 Caged Displacer Sensors
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 2.................................
Type Number Description 3.....................
Educational Services 4.........................
Maintenance 4.................................
Cleaning the Cage 5...........................
Removing the Displacer and Stem 6..............
Replacing the Displacer, Cotter Spring, Stem
End Piece, and Displacer Spud 7...............
Replacing the Displacer Rod/Driver Assembly 8....
Replacing the Torque Tube 9....................
Changing Cage Head Position 10................
Replacing the Torque Tube Arm and
Changing the Mounting 11...................
Simulation of Process Conditions for Calibration
of Fisher Level Controllers and Transmitters 12....
Related Documents 12..........................
Parts Ordering 12...............................
Parts Kits 13...................................
Parts List 13...................................
Figure 1. Fisher 249B Sensor with 2500 Controller
W3121‐3
Introduction
Scope of Manual
This instruction manual 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 manual.
Note
Caged sensors have a rod and block shipping lock installed on each end of the displacer to protect the displacer in shipping, as
shown in figure 2. Remove these parts before installing the sensor to allow the displacer to function properly.
Do not install, operate or maintain a 249 sensor without being fully trained and qualified in valve, actuator, and
accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to
Instruction Manual
D200099X012
249 Caged Sensors
April 2017
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