Emerson Fisher L2, Instruction Manual

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Fisher
r L2
Liquid Level Controller
Contents
Introduction 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scope of Manual 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Education Services 3 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Attaching Vertical Displacer 4 . . . . . . . . . . . . . . . . . . .
Attaching Horizontal Displacer 4 . . . . . . . . . . . . . . . . .
Attaching the Sensor to the Vessel 5 . . . . . . . . . . . . .
Pressure Connections 5 . . . . . . . . . . . . . . . . . . . . . . . .
Vent 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing Controller Action or Mode 6 . . . . . . . . . . . . .
Throttling and On/Off Controllers 6 . . . . . . . . . . . . . .
Snap‐Acting Controller 6 . . . . . . . . . . . . . . . . . . . . . . .
Span Adjustment 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preliminary Checks 8 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Direct‐Acting Throttling Controllers 9 . . . . . . . . . . . .
Reverse‐Acting Throttling Controllers 9 . . . . . . . . . . .
Direct‐Acting On/Off and
Snap‐Acting Controllers 9 . . . . . . . . . . . . . . . . . . . .
Reverse‐Acting On/Off and
Snap‐Acting Controllers 9 . . . . . . . . . . . . . . . . . . . .
Principle of Operation 10 . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Controller From the Sensor 11 . . . . . . . .
Replacing the Sensor O‐Rings 11 . . . . . . . . . . . . . . . . .
Disassembly 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assembly 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Controller Relay 13 . . . . . . . . . . . . . . . .
Replacing the Controller Supply Filter 13 . . . . . . . . . .
Figure 1. Fisher L2 Liquid Level Controller
W8418‐1
Related Documents 14 . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Kits 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controller 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sensor 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction
Scope of Manual
This instruction manual includes installation, adjustment, maintenance, and parts ordering information for the Fisher
L2
liquid level controller.
Do not install, operate or maintain an
L2
Liquid Level Controller 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 carefully read, understand, and follow all contents of this manual, including all safety cautions and
warnings.
If you have any questions about these instructions, contact your Emerson Process Management sales office
before proceeding.
Instruction Manual
D103032X012
L2 Controller
July 2015