Fisher 249 User Manual

www.Fisher.com
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

Fisher 249 Specifications

General

Brand	Fisher
Model	249
Category	Accessories
Language	English

Summary

Introduction

Scope of Manual

Manual covers maintenance and parts ordering for 249 caged sensors.

Product Description

Explains the function and components of the 249 sensors.

Maintenance Procedures

Safety Precautions for Maintenance

General safety precautions before performing maintenance on the sensor.

Cleaning the Cage

Procedure for cleaning the sensor cage to remove process residue.

Removing Displacer and Stem

Steps to remove the displacer and its stem from the sensor.

Replacing Displacer Assembly Components

Instructions for replacing key displacer assembly parts like cotter spring, stem end piece.

Replacing Displacer Rod/Driver Assembly

Procedure for replacing the displacer rod/driver assembly.

Replacing the Torque Tube

Steps for replacing the torque tube assembly due to wear or leakage.

Changing Cage Head Position

How to reposition the cage head for different mounting orientations.

Replacing Torque Tube Arm and Mounting

Procedure for replacing the torque tube arm and altering the mounting.

Calibration and Reference

Calibration Process Simulation

Information on simulating process conditions for calibration purposes.

Related Documents

Lists related documents for further information on sensors and controllers.

Parts Ordering Guidance

Guidance on how to order replacement parts for the sensor.

Parts Information

Parts Kits

Details on available parts kits for the 249 sensors.

Parts List

Comprehensive list of sensor components with descriptions.

Sensor Common Parts

Lists common parts shared across different 249 sensor models.