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Fisherr L2e Electric Level Controller

Contents

Introduction 1.................................

Scope of Manual 1.............................

Description 2.................................

Specifications 2...............................

Educational Services 2.........................

Installation 4..................................

Attaching a Vertical Displacer 5..................

Attaching a Horizontal Displacer 5...............

Attaching the Sensor to the Vessel 5.............

Electrical Connections 6........................

L2e Initial Setup (Dry Displacer) 10...............

L2e Zero and Span Adjustment (Wet Displacer) 10..

Principle of Operation 11........................

Maintenance 12................................

Removing the Controller From the Sensor 12......

Installing Sensor Repair Kit (RL2SENSX012) 12.....

Replacing the Complete Controller

Assembly (RL2ECTLRX12) 13..................

Related Documents 14..........................

Parts Ordering 14...............................

Figure 1. Fisher L2e Electric Level Controller

X0660

Introduction

Scope of Manual

This instruction manual includes installation, adjustment, maintenance, and parts ordering information for the Fisher

L2e electric liquid level controller.

Do not install, operate or maintain an L2e electric 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 the 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

D103531X012

L2e Controller

June 2014

Summary of content (16 pages)

PAGE 1
Instruction Manual L2e Controller D103531X012 June 2014 Fisherr L2e Electric Level Controller Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Educational Services . . . . . . . . . . . . . . . . . . . . . . . . . 2 Installation . .
PAGE 2
L2e Controller June 2014 Instruction Manual D103531X012 Description The L2e electric liquid level differential gap on-off controller uses a displacement type sensor to detect liquid level or the interface of two liquids of different specific gravities. The L2e controls the lower trip point (zero) that closes the dump valve, allowing the vessel to fill to the upper trip point. Once the upper trip point is reached, the dump valve opens to drain the fluid down to the zero or lower trip point.
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Instruction Manual L2e Controller D103531X012 June 2014 Table 1.
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L2e Controller Instruction Manual D103531X012 June 2014 Table 1.
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Instruction Manual L2e Controller D103531X012 June 2014 1. Be sure there are no obstructions inside the vessel that will interfere with displacer installation or operation. 2. Provide the appropriate connection in the vessel wall to match the sensor connection. Locate the vessel wall connection such that the displacer will be at the desired control level. Attaching a Vertical Displacer Refer to figure 9 for part locations. 1.
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Instruction Manual L2e Controller D103531X012 June 2014 Electrical Connections WARNING For explosionproof applications, disconnect power before installing, servicing or removing electrical components. Personal injury or property damage from fire or explosion may result if power is not disconnected. Select junction boxes, wiring and/or cable glands that are rated for the environment of use (such as hazardous location, ingress protection, and temperature).
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Instruction Manual L2e Controller D103531X012 June 2014 Wiring Configurations There are two recommended wiring configurations depending on the preferred site solution and approach to electric level control; a direct connection to the easy-Drive actuator, shown in figure 3 or a direct connection to the easy-Drive actuator and a remote monitor (figure 4 and 5). In these examples, the L2e is wired using a common and separate N/O or N/C contact.
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Instruction Manual L2e Controller D103531X012 June 2014 Figure 4.
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Instruction Manual L2e Controller D103531X012 June 2014 Figure 5.
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Instruction Manual L2e Controller D103531X012 June 2014 L2e Initial Setup (Dry Displacer) Refer to figure 6. 1. Move Span to minimum setting. 2. Move Zero down until the valve opens, or N/C contact (red to brown leads) closes. 3. Slowly move Zero up until valve closes, or N/C contact (red to brown leads) opens. L2e Zero and Span Adjustment (Wet Displacer) After initial setup (dry displacer) is complete, 1. Enable process flow into the vessel. 2.
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Instruction Manual L2e Controller D103531X012 June 2014 Principle of Operation The operation of the L2e is based on Archimedes Principle, which states that a body immersed in a liquid will be buoyed up by a force equal to the weight displaced. The buoyant force and resultant movement of the displacer in the liquid is transmitted to the controller. As the buoyant force changes a proportional change in movement is seen by levers A and B (refer to figure 7).
PAGE 12
L2e Controller Instruction Manual June 2014 D103531X012 Maintenance Parts are subject to normal wear and must be inspected periodically and replaced as necessary. The frequency of parts inspection and replacement depends upon the severity of service conditions. When inspection or repairs are required, disassemble only those parts necessary to accomplish the task. WARNING Always wear protective clothing, gloves, and eyewear when performing any maintenance operations to avoid personal injury.
PAGE 13
Instruction Manual L2e Controller D103531X012 June 2014 Assembly WARNING Improper assembly of the Orings, anti-extrusion ring, and backup ring could result in Oring extrusion and permit leakage of process fluids. To avoid personal injury or property damage from leaking process fluid, be sure the Orings, antiextrusion ring and backup ring are assembled in the order shown in figure 9. 1. Place the pivot body (key 72) on the displacer rod (key 64) so that it is positioned as shown in figure 9. 2.
PAGE 14
Instruction Manual L2e Controller D103531X012 June 2014 Related Documents D Bulletin 34.
PAGE 15
Instruction Manual L2e Controller D103531X012 June 2014 Figure 8. Fisher L2e Electric Level Controller Assembly GG10047-E Parts List Key Note Note For part numbers not shown, contact your Emerson Process Management sales office. Keys 74, 75, 76, 77, and 78 are included in the Sensor Repair Kit.
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Instruction Manual L2e Controller D103531X012 June 2014 Figure 9. Sensor VIEW B-B SCALE 2:1 A SECTION C-C SCALE 2:1 A B C j APPLY LUB/SEALANT C SECTION A-A GG12263-B Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.