Emerson Fisher Level-Trol 2502 Series - User Manual

www.Fisher.com
D200126X012
2502 Series Level-Trol
R
Controller
Contents
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scope of Manual 1. . . . . . . . . . . . . . . . . . . . . . . . .
Description 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Educational Services 2. . . . . . . . . . . . . . . . . . . . . .
Installation 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
249 Series Sensors 4. . . . . . . . . . . . . . . . . . . . . . .
Uncrating 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controller Orientation 5. . . . . . . . . . . . . . . . . . . . .
Controller-Sensor Action 5. . . . . . . . . . . . . . . . . . .
Mounting Caged Sensors 6. . . . . . . . . . . . . . . . . .
Mounting Cageless Sensors 7. . . . . . . . . . . . . . .
Side-Mounted Sensor 8. . . . . . . . . . . . . . . . . . . .
Top-Mounted Sensor 8. . . . . . . . . . . . . . . . . . . .
Regulator Supply Pressure 9. . . . . . . . . . . . . . . .
Prestartup Checks 9. . . . . . . . . . . . . . . . . . . . . . . . .
Adjustments 11. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Level Set Adjustment 11. . . . . . . . . . . . . . . . . . .
Proportional Band Adjustment 11. . . . . . . . . . . .
Reset Adjustment 11. . . . . . . . . . . . . . . . . . . . . .
Differential Relief Adjustment 12. . . . . . . . . . . .
Calibration 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Precalibration Requirements 12. . . . . . . . . . . . . .
Wet Calibration 12. . . . . . . . . . . . . . . . . . . . . . . . .
Dry Calibration 12. . . . . . . . . . . . . . . . . . . . . . . . .
Controller and Torque Tube Arm
Disassembly 12. . . . . . . . . . . . . . . . . . . . . . . .
Determining Suspended Weight
for Calibration 13. . . . . . . . . . . . . . . . . . . . . . .
Calibration Procedure 14. . . . . . . . . . . . . . . . . . . .
Startup 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Principle of Operation 15. . . . . . . . . . . . . . . . . . . . .
Type 2502 Controller 15. . . . . . . . . . . . . . . . . . . . .
Type 2502F Controller with Reset
Relief Valve 17. . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 18. . . . . . . . . . . . . . . . . . . . . . . . .
Removing Controller from Sensor 18. . . . . . . . . .
Changing Mounting Method 20. . . . . . . . . . . . . . .
Installing Controller on Sensor 20. . . . . . . . . . . . .
Changing Proportional, Reset, or
Differential Relief Valve 21. . . . . . . . . . . . . . . . .
Testing Relay Dead Band 21. . . . . . . . . . . . . . . . .
Changing Relay 21. . . . . . . . . . . . . . . . . . . . . . . . .
TYPE 2502
CONTROLLER
249B SERIES SENSOR
W8334
Figure 1. Type 2502 Controller Mounted on
Type 249B Sensor
Replacing Bellows 22. . . . . . . . . . . . . . . . . . . . . . .
Reversing Action 22. . . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering 23. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Kits 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction
Scope of Manual
This instruction manual provides installation,
operating, calibration, and maintenance procedures
for 2502 Series pneumatic controllers (figure 1) used
in combination with 249 Series level sensors.
This manual does not include regulator or sensor
installation or maintenance procedures. For this
information, refer to the instruction manual for the
appropriate regulator and 249 Series level sensor.
Instruction Manual
Form 1446
November 2006
2502 Series Controllers

Summary

Installation

General Installation

General information on controller installation with sensors, including warnings.

Prestartup Checks

Prestartup Procedures

Essential steps before startup, including setting controls and checking process variable behavior.

Controller Adjustments Overview

Adjustment Locations

Figure 9 shows locations for controller adjustments.

Specific Controller Adjustments

Level Set, Proportional Band, and Reset

Procedures for adjusting level set, proportional band, and reset rate controls.

Calibration

Precalibration and Wet Calibration

Requirements before calibration and procedures for wet calibration using process or simulated liquid.

Disassembly and Dry Calibration

Calibration Procedure

Calibration Steps

Detailed step-by-step guide for calibrating the 2502 Series controller, including checks and adjustments.

Startup Procedures

Startup Steps

Procedures for bringing the controller online after installation and calibration, including band and reset settings.

Principle of Operation

Type 2502 Controller Operation

Maintenance and Troubleshooting

Maintenance Overview

General maintenance information for the 2502 Series controllers, including safety warnings.

Troubleshooting Faults

Guidance on diagnosing and correcting common operating faults using a troubleshooting chart.

Removing Controller from Sensor

Emerson Fisher Level-Trol 2502 Series Specifications

General

Category	Controller
Ambient Temperature Range	-40 to 180°F (-40 to 82°C)
Enclosure Rating	NEMA 4X, IP66
Approvals	FM, CSA, ATEX, IECEx
Model	2502 Series
Type	Level-Trol
Input Signal	Displacer position
Output Signal	Pneumatic
Supply Pressure	20 to 35 psig
Power Supply	Not applicable
Mounting	Bracket or direct mounting
Materials	Stainless Steel