Emerson Fisher 2502

www.Fisher.com
Fisher
™
2502 Controllers
Contents
Introduction 2.................................
Scope of Manual 2.............................
Description 2.................................
Specifications 2...............................
Educational Services 2.........................
Installation 4..................................
249 Sensors 5................................
Uncrating 5..................................
Controller Orientation 6........................
Controller‐Sensor Action 6......................
Mounting Caged Sensors 7.....................
Mounting Cageless Sensors 9...................
Side‐Mounted Sensor 9.....................
Top‐Mounted Sensor 10....................
Supply Pressure 11............................
Prestartup Checks 12...........................
Adjustments 13...............................
Level Set Adjustment 13....................
Proportional Band Adjustment 13............
Reset Adjustment 14.......................
Differential Relief Adjustment 15.............
Calibration 15..................................
Precalibration Requirements 15.................
Wet Calibration 15.........................
Dry Calibration 15.........................
Controller and Torque Tube Arm
Disassembly 16.........................
Determining Suspended Weight
for Calibration 16........................
Calibration Procedure 17.......................
Startup 18.....................................
Principle of Operation 19........................
2502 Controller 21............................
2502F Controller with Reset
Relief Valve 21..............................
Maintenance 22................................
Troubleshooting 23............................
Removing Controller from Sensor 24.............
2502 CONTROLLER
249B SENSOR
W8334
Figure 1. Fisher 2502 Controller Mounted on 249B
Sensor
Changing Mounting Method 25.................
Installing Controller on Sensor 26................
Changing Proportional, Reset, or
Differential Relief Valve 27..................
Testing Relay Dead Band 27.....................
Changing Relay 27.............................
Replacing Bellows 27..........................
Reversing Action 28...........................
Parts Ordering 29...............................
Parts Kits 29...................................
Parts List 29...................................
Instruction Manual
D200126X012
2502 Controllers
June 2017

Emerson Fisher 2502 Specifications

General

Brand	Emerson
Model	Fisher 2502
Category	Controller
Language	English

Summary

Introduction

Specifications

Details general specifications of 2502 controllers.

Supply Pressure Requirement

Performance

Lists key performance metrics like hysteresis and repeatability.

Hazardous Area Classification

Installation

249 Sensors

Describes different types of 249 sensors and their mounting.

Controller Orientation

Controller-Sensor Action

Explains direct and reverse action based on mounting.

Mounting Caged Sensor

Details plumb installation and cage connections for caged sensors.

Mounting Cageless Sensor

Instructions for installing cageless sensors with stillwells or without.

Side-Mounted Sensor

Describes side-mounting procedures for sensors and displacer attachment.

Top-Mounted Sensor

Details installing top-mounted cageless sensors and displacer rod connection.

Supply Pressure

Prestartup Checks

Adjustments

Level Set Adjustment

How to adjust the level set point using the RAISE LEVEL dial.

Proportional Band Adjustment

Procedure to adjust proportional band via a knob.

Reset Adjustment

How to adjust the reset rate in minutes per repeat.

Calibration

Precalibration Requirements

Wet Calibration

Dry Calibration

Controller and Torque Tube Arm Disassembly

Determining Suspended Weight for Calibration

Calibration Procedure

Step-by-step guide for calibrating the controller.

Startup

Principle of Operation

2502 Controller

2502 F Controller with Differential Relief Valve

Maintenance

Changing Proportional, Reset, or Differential Relief Valve

Testing Relay Dead Band

Changing Relay

Replacing Bellows

Reversing Action

Troubleshooting

Parts Ordering