Instruction manual

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Fisherr 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

September 2013

Summary of content (16 pages)

PAGE 1
Instruction Manual L2 Controller D103032X012 September 2013 Fisherr L2 Liquid Level Controller Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Education Services . . . . . . . . . . . . . . . . . . . . . . . . . . .
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L2 Controller Instruction Manual September 2013 D103032X012 Table 1. Specifications between 1.4 and 5.2 bar (20 and 50 psig) direct, and 1.4 bar and 2.4 bar (20 and 35 psig) reverse Available Configurations Controller: Snap‐acting or throttling Sensor: Displacer‐type liquid level sensor for mounting to side of tank. Displacer travel is transmitted to controller by pivotal movement of displacer rod Do not use supply pressure below 1.
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Instruction Manual L2 Controller D103032X012 September 2013 Table 1. Specifications (continued) Displacer Material and Sensor Temperature Limits(8) PVC Displacer -29 to 79_C (-20 to 175_F) S31603 SST Displacer: -40 to 204_C (-40 to 400_F) Operative Ambient Temperature Limits(8) Controller: -29 to 71_C (-20 to 160_F) Standard Supply, and Output Pressure Gauge Indications Triple scale gauges in 0 to 60 psig/0 to 0.4 MPa/0 to 4.
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L2 Controller Instruction Manual September 2013 D103032X012 Installation WARNING Always wear protective clothing, gloves, and eyewear when performing any installation operations to avoid personal injury. To avoid personal injury or property damage caused by the sudden release of process fluid, be certain the service conditions do not exceed the sensor pressure limits. Use pressure‐limiting or pressure‐relieving devices to prevent service conditions from exceeding these limits.
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Instruction Manual L2 Controller D103032X012 September 2013 Attaching the Sensor to the Vessel Insert the displacer end of the controller‐sensor assembly into the tank connection, and screw the sensor threads into the tank connection. Tighten sufficiently to seal the threads. If necessary, loosen or tighten slightly to obtain the orientation shown in figure 2. Make sure that the controller case is level. CAUTION Do not pick up the controller/sensor by lifting the displacer rod (key 64).
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L2 Controller Instruction Manual September 2013 D103032X012 Vent WARNING If a flammable or hazardous gas is to be used as the supply pressure medium, personal injury or property damage could result from fire or explosion of accumulated gas or from contact with hazardous gas. The controller/actuator assembly does not form a gas‐tight seal, and when the assembly is enclosed, a remote vent line, adequate ventilation, and necessary safety measures should be used.
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Instruction Manual L2 Controller D103032X012 September 2013 Figure 3. Fisher L2 Throttling and On/Off Controller Switch Positions for Changing Action and Control Mode SWITCH RETENTION SCREWS 1 SWITCH RETENTION SCREWS 1 DIRECT ACTION THROTTLING CONTROL MODE DIRECT ACTION ON/OFF CONTROL MODE REVERSE ACTION ON/OFF CONTROL MODE REVERSE ACTION THROTTLING CONTROL MODE NOTE: 1 ALL FOUR SWITCH RETENTION SCREWS SHOWN ONLY ON THIS VIEW.
PAGE 8
L2 Controller Instruction Manual September 2013 D103032X012 Span Adjustment Except where indicated, key numbers referenced in the following procedures are shown in figure 8. The span levers and other proportional band information are shown in figure 5. Figure 5. Proportional Band Adjustments SPAN LEVER GAP MINIMUM SPAN (MOST SENSITIVE) POSITION FOR THROTTLING AND ON/OFF CONTROLLER.
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Instruction Manual L2 Controller D103032X012 September 2013 5. Check figures 3 and 4 for correct control action and control mode. 6. Adjust the relay adjustment screw (key 49, throttling controller) or the valve assembly (key 51, snap‐acting controller) so that the gap between the span levers (see figure 5) is equal when lever A is contacting the displacer rod. Direct‐Acting Throttling Controllers 1. Make certain the Preliminary Checks procedure at the start of this section has been completed. 2.
PAGE 10
L2 Controller Instruction Manual September 2013 D103032X012 Principle of Operation The operation of L2 controllers in combination with the 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 liquid displaced. The buoyant force and resultant movement of the displacer in the liquid is transmitted to the controller which delivers a pneumatic signal to a control valve.
PAGE 11
Instruction Manual L2 Controller D103032X012 September 2013 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 12
L2 Controller Instruction Manual September 2013 D103032X012 4. Slide the pivot base (key 73), retaining ring (key 76), anti‐extrusion ring (key 75), and O‐ring (key 74) off the displacer rod. Remove the O‐ring (key 77) and backup ring (key 78) from the pivot base. Figure 7.
PAGE 13
Instruction Manual L2 Controller D103032X012 September 2013 Assembly WARNING Improper assembly of the O‐rings, anti‐extrusion ring, and backup ring could result in O‐ring extrusion and permit leakage of process fluids. To avoid personal injury or property damage from leaking process fluid, be sure the O‐rings, anti‐extrusion ring and backup ring are assembled in the order shown in figure 7. 1. Place the pivot body (key 72) on the displacer rod (key 64) so that it is positioned as shown in figure 7. 2.
PAGE 14
L2 Controller Instruction Manual September 2013 D103032X012 Related Documents D Converting a Threaded NPT Connection to a Flange Connection—Supplement to Fisher L2 and L2sj Liquid Level Controller Instruction Manuals (D103277X012) D Dimensions for NPS 2 CL150 through 1500 Slip On Flange Connections—Supplement to Fisher L2 and L2sj Liquid Level Controller Instruction Manuals (D103405X012) D Fisher L2sj Low Emission Liquid Level Controller Instruction Manual (D103216X012) All documents are available from
PAGE 15
Instruction Manual L2 Controller D103032X012 September 2013 Figure 8.
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L2 Controller Instruction Manual September 2013 D103032X012 Key Description Part Number 6 7 Span Lever Assembly, stainless steel Shoulder Screw, stainless steel (2 req'd) 8 9 10 11 Flanged Bearing, nylon (4 req'd) Span Adjustor, stainless steel Pressure Gauge (2 req'd) Mounting Screw, stainless steel (4 req'd) 12 13* Cover Screw, stainless steel O‐Ring(1), nitrile 14 15 16* 17 18* 19 Filter Cap, reinforced PMMA (polymethylmethacrylate) Filter 11B2307X012 O‐Ring(1), nitrile Machine Screw, s