Emerson Fisher L2e Instruction Manual
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Emerson Fisher L2e Instruction Manual

Emerson Fisher L2e Instruction Manual

Electric level controller
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Instruction Manual
D103531X012
Fisher
L2e Electric Level Controller
™
Contents
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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
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Figure 1. Fisher L2e Electric Level Controller
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before proceeding.
L2e Controller
June 2022

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Summary of Contents for Emerson Fisher L2e

  • Page 1: Table Of Contents

    ™ Contents Figure 1. Fisher L2e Electric Level Controller Introduction ....... . .

  • Page 2: Description

    Unless otherwise noted, all NACE references are to NACE MR0175­2002. Specifications Specifications for the controller and sensor are listed in table 1. Educational Services Emerson Automation Solutions Educational Services - Registration Phone: +1-800-338-8158 E-mail: education@emerson.com emerson.com/mytraining...
  • Page 3 Instruction Manual L2e Controller D103531X012 June 2022 Table 1. Specifications Available Configurations Displacer Sizes J 48 X 305 mm, 541 cm Controller: Differential gap (DG) electric control (1­7/8 X 12 inches, 33 in J 76 X 152 mm, 688 cm (3 X 6 inches, 42 in action with intuitive Zero and Span Adjustments (refer to page 2 for differential gap description)

  • Page 4: Installation

    1. Converting from a threaded NPT connection to a flange connection is to be done by the end-user. Refer to Converting a Threaded NPT Connection to a Flange Connection instruction Manual Supplement (D103277X012), available at Fisher.com or from your Emerson sales office.

  • Page 5: Attaching A Vertical Displacer

    Instruction Manual L2e Controller D103531X012 June 2022 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.

  • Page 6: Electrical Connections

    Instruction Manual L2e Controller June 2022 D103531X012 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).
  • Page 7 Instruction Manual L2e Controller D103531X012 June 2022 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).
  • Page 8 Instruction Manual L2e Controller June 2022 D103531X012 Figure 4. Local Level Loop Control with Direct Connect to easy-Drive Actuator with ROC809 Remote Monitor REMOVE COVER TO ACCESS POWER AND CONTROL TERMINAL X0661 12/24 VDC POWER SUPPLY GREEN (GND) WHITE/RED WHITE/BLACK BROWN OPEN BLUE...
  • Page 9 Instruction Manual L2e Controller D103531X012 June 2022 Figure 5. Local Level Loop Control with Direct Connect to easy-Drive Actuator with FloBoss 107 Remote Monitor REMOVE COVER TO ACCESS POWER AND CONTROL TERMINAL X0661 12/24 VDC POWER SUPPLY GREEN (GND) WHITE/RED WHITE/BLACK BROWN OPEN...

  • Page 10: Seal Certification

    Instruction Manual L2e Controller June 2022 D103531X012 Seal Certification The L2e instrument is not dual-seal certified. However, the enclosure is not exposed to process pressure during normal operation, and is vented, as shown in 6. The process seal is contained in the separate mechanical sensor which can be separated from the L2e enclosure without disturbing the process connection.

  • Page 11: L2E Initial Setup (Dry Displacer)

    Instruction Manual L2e Controller D103531X012 June 2022 L2e Initial Setup (Dry Displacer) Refer to figure 7. 1. Apply power to the L2e Switch assembly. 2. Move Span to minimum setting. 3. If the switch is already in the state that opens the dump valve, skip to step 4. Otherwise, (e.g., lever B is resting on its travel stop), first move the plunger away from the switch by moving the Zero adjustment until the switch just changes to the state required to open the dump valve.

  • Page 12: Principle Of Operation

    Instruction Manual L2e Controller June 2022 D103531X012 Principle of Operation The operation of the L2e’s mechanical sensor 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 of the fluid being displaced. The net weight of the displacer in the liquid is transmitted to the controller and amplified by the lever arm ratio.
  • Page 13 Instruction Manual L2e Controller D103531X012 June 2022 Figure 9. Fisher L2e Controller Operation PROCESS INLET PROCESS VESSEL ELECTRONIC EasyDrive SWITCH UPPER TRIP POINT DIFFERENTIAL GAP SET BY SPAN ADJUSTMENT LOWER TRIP POINT DUMP DUMP VALVE OPENS AT UPPER TRIP POINT CLOSES AT LOWER TRIP POINT Figure 10.

  • Page 14: Maintenance

    Instruction Manual L2e Controller June 2022 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 15: Replacing The Complete Controller Assembly (Rl2E0X00C22)

    Instruction Manual L2e Controller D103531X012 June 2022 4. Slide the pivot base (key 73), retaining ring (key 76), anti­extrusion ring (key 75), and O­ring (key 74) off the displacer rod. Remove the O­ring (key 77) and backup ring (key 78) from the pivot base. Assembly WARNING Improper assembly of the O­rings, anti-extrusion ring, and backup ring could result in O­ring extrusion and permit leakage...

  • Page 16: Related Documents

    Use only genuine Fisher replacement parts. Components that are not supplied by Emerson should not, under any circumstances, be used in any Fisher instrument. Use of components not supplied by Emerson may void your warranty, might adversely affect the performance of the valve, and could cause personal injury or property damage.
  • Page 17 Instruction Manual L2e Controller D103531X012 June 2022 Figure 11. Fisher L2e Electric Level Controller Assembly GG10047-K Parts List Description Drive screw Knife pivot body Description Knife pivot base) Note Note Keys 74, 75, 76, 77, and 78 are included in the Sensor Repair Kit.
  • Page 18 Instruction Manual L2e Controller June 2022 D103531X012 Figure 12. Sensor VIEW B-B SCALE 2:1 SECTION C-C SCALE 2:1 SECTION A-A j APPLY LUB/SEALANT GG12263-B...
  • Page 19 Instruction Manual L2e Controller D103531X012 June 2022...
  • Page 20 Fisher and easy-Drive are marks owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.

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