Emerson Fisher L2 User manual

www.Fisher.com

FisherrL2 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

Instruction Manual

D103032X012

L2 Controller

July 2015

Table 1. Specifications

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

Input Signal

Type: Liquid level or liquid‐to‐liquid interface

Level Change Required for Full Change in Output

Signal in 1.0 Specific Gravity Liquid, with 1.4 Bar (20

Psig) Supply Pressure, Direct Action, and Standard 48

x 305 mm (1‐7/8 X 12‐Inch) Vertical Displacer with

Standard Lever Arm Length:

Control

Mode

Minimum Proportional

Band Level Change, mm

(Inches)(1)

Maximum Proportional

Band Level Change, mm

(Inches)(1)

Throttling 102 (4) 305 (12)

On/Off 127 (5) 305 (12)

Snap‐acting 13 (0.5) 20 (0.8)

Minimum Specific Gravity(2)

Throttling and On/Off Controllers: Minimum specific

gravity, or specific gravity differential for interface

applications, is 0.1 (see footnote 3)

Snap‐Acting Controllers: Minimum specific gravity, or

specific gravity differential for interface applications,

is 0.1

Output Signal

Pneumatic Jon‐off or Jproportional pressure

signal

Ranges:

Throttling: J0.2 to 1.0 bar (3 to 15 psig) or J0.4 to

2.0 bar (6 to 30 psig)

On/Off: 0 (off) or full supply pressure (on)

Action: Field‐reversible between direct (increasing

level increases output signal) and reverse (increasing

level decreases output signal)

Supply Pressure Requirements

Throttling and On/Off Controller

Throttling: 1.4 bar for 0.2 to 1.0 bar output signal (20

psig for 3 to 15 psig output signal) and 2.4 bar for 0.4

to 2.0 bar output signal (35 psig for 6 to 30 psig

output signal)

On/Off: Any desired pressure between 1.4 and 3.4 bar

(20 and 50 psig).

Snap‐Acting Controller: Any desired pressure

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

Do not use supply pressure below 1.4 bar (20 psig)

Supply Medium

Air or natural gas(4)

Steady‐State Air Consumption(5)

Throttling Controller: ≤0.03 normal m3/hr (1.0 scfh)

at 1.4 bar (20 psig) supply pressure

Snap‐Acting Controller: ≤0.03 normal m3/hr (1.0

scfh) at 1.4 bar (20 psig) supply pressure or ≤0.04

normal m3/hr (1.5 scfh) at 2.4 bar (35 psig) supply

pressure in tripped condition; air consumption

increases during trip

Sensor to Vessel Connection

J2 NPT threaded or JNPS 2 CL150 through 1500

slip‐on flange connection(6)

Controller Connections

Supply: 1/4 NPT internal located on the bottom of the

case

Output: 1/4 NPT internal located on the top of the

case

Case Vent: 1/4 NPT internal with vent screen

assembly located on the back of the case

Standard Displacer Size

48 x 305 mm, 541 cm3(1‐7/8 x 12 inches, 33 in3)

Maximum Displacer Insertion Length(7)

Standard lever arm length plus one 6‐inch extension,

horizontal or vertical

Displacer Material and Maximum Sensor Working

Pressure(8)

PVC Displacer: Consistent with CL1500 pressure

temperature ratings per ASME B16.34 up to

maximum pressure of 258 bar (3750 psig)

For PED (97/23/EC) maximum pressure limited to 200

bar (2900 psig)

S31603 SST Displacer: CL600 pressure temperature

ratings per ASME B16.34 up to maximum pressure of

99.3 bar (1440 psig)

Note: For slip‐on flange connection, maximum sensor

working pressure must be consistent with the flange

ratings

-Continued-

Instruction Manual

D103032X012

L2 Controller

July 2015

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

4.0 bar

Hazardous Area Classification

Complies with the requirements of ATEX Group II

Category 2 Gas and Dust

Declaration of SEP

Fisher Controls International LLC declares this

product to be in compliance with Article 3 paragraph

3 of the Pressure Equipment Directive (PED) 97 / 23 /

EC. It was designed and manufactured in accordance

with Sound Engineering Practice (SEP) and cannot

bear the CE marking related to PED compliance.

However, the product may bear the CE marking to

indicate compliance with other applicable European

Community Directives.

NOTE: Specialized instrument terms are defined in ISA Standard 51.1 - Process Instrument Terminology.

1. Any deviation from the standard construction described in the input signal specification above requires special displacer sizing considerations. Contact your Emerson Process Management sales

office for information.

2. Depends on float rod/displacer orientation and length. Contact your Emerson Process Management sales office before proceeding for further information.

3. Minimum specific gravity differential with standard displacer is 0.4. Minimum specific gravity differential of 0.1 is possible with special displacer, consult your Emerson Process Management sales

office for displacer sizing information.

4. This product can be used with natural gas as the supply medium.

5. Normal m3/hr—Normal cubic meters per hour (0_C and 1.01325 bar, absolute) Scfh—Standard cubic feet per hour (60_F and 14.7 psia).

6. 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 www.Fisher.com or from your Emerson Process Management sales office.

7. Standard lever arm length.

8. The pressure and temperature limits in this document and any applicable code limitations should not be exceeded.

Description

The rugged L2 liquid level controllers use a displacer type sensor (see figure 1) to detect liquid level or the interface of

two liquids of different specific gravities.

These controllers use a single four‐mode relay to provide the applicable control and action. The device delivers a

pneumatic output signal to a control/dump valve.

Unless otherwise noted, all NACE references are to NACE MR0175‐2002.

Specifications

Specifications for the controller and sensor are listed in table 1.

Educational Services

For information on available courses for L2 Liquid Level Controllers, as well as a variety of other products, contact:

Emerson Process Management

Educational Services, Registration

Phone: +1-641-754-3771 or +1-800-338-8158

Email: [email protected]

http://www.emersonprocess.com/education

Instruction Manual

D103032X012

L2 Controller

July 2015

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.

Personal injury or property damage may result from fire or explosion if natural gas is used as the supply medium and

appropriate preventive measures are not taken. Preventive measures may include, but are not limited to, one or more of

the following: Remote venting of the unit, re‐evaluating the hazardous area classification, ensuring adequate ventilation,

and the removal of any ignition sources. For information on remote venting of this controller, refer to page 6.

Check with your process or safety engineer for any additional measures that must be taken to protect against process

media.

If installing this into an existing application, also refer to the WARNING at the beginning of the Maintenance section of this

instruction manual.

CAUTION

If the L2 level controller is installed on a vessel that is to be shipped to a different location (e.g. skid mounted units), remove

the displacer and displacer rod extensions before shipment. Failure to do so could result in damage to the displacer rod due

to vibration and impact loading during shipment. After the vessel is installed at its final location, reassemble the displacer

and displacer rod extension.

1. Be sure there are no obstructions inside the tank that will interfere with displacer installation or operation.

2. Provide the appropriate connection in the tank wall to match the sensor connection. Locate the tank wall

connection such that the displacer will be at the desired control level.

Attaching a Vertical Displacer

Refer to figure 7 for part locations.

1. Thread jam nut (key 68) all the way onto the threaded portion of the universal joint assembly (key 69).

2. Thread the displacer (key 81) all the way onto the threaded portion of the universal joint assembly.

3. Tighten the jam nut (key 63) against the displacer (key 81).

Attaching a Horizontal Displacer

Refer to figure 7 for part locations.

1. Thread the displacer (key 81) all the way onto the displacer rod (key 64) or extension (key 82).

2. Tighten the jam nut (key 63) against the displacer (key 81).

Instruction Manual

D103032X012

L2 Controller

July 2015

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). This action could place excessive stress on the

displacer rod and cause the unit to malfunction.

Figure 2. Sensor Orientation

CORRECT CONTROLLER MOUNTING

HOLE ORIENTATION WHEN MOUNTED ON VESSEL

A6639

Pressure Connections

WARNING

Personal injury or property damage may occur from an uncontrolled process if the supply medium is not clean, dry, oil‐free

air, or non‐corrosive gas. While use and regular maintenance of a filter that removes particles larger than 40 micrometers

in diameter will suffice in most applications, check with an Emerson Process Management field office and industry

instrument air quality standards for use with corrosive air or if you are unsure about the proper amount or method of air

filtration or filter maintenance.

1. Provide a source of clean, dry air that meets the requirements of ISA Standard 7.0.01 as the operating medium.

Refer to table 1 to determine supply pressure.

2. Connect the supply pressure to the 1/4 NPT internal connection on the bottom of the controller case.

3. Connect the output signal line to the equipment being operated and to the 1/4 NPT output connection on the top

of the controller case.

Instruction Manual

D103032X012

L2 Controller

July 2015

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. However, a remote vent pipe alone cannot be relied upon to remove all hazardous gas.

Vent line piping should comply with local and regional codes and should be as short as possible with adequate inside

diameter and few bends to reduce case pressure buildup.

The vent opening or the end of the remote vent pipe, if one is required, must be protected against the entrance of all

foreign matter that could plug the vent. Use 13 mm (1/2‐inch) diameter pipe for the remote vent pipe. Check the vent

periodically to be certain it is free of any obstructions.

Changing Controller Action or Mode

WARNING

To avoid personal injury caused by a sudden release of pressure, shut off the supply pressure and bleed pressure from the

supply lines before performing any procedure in this section.

Throttling and On/Off Controller

The action of a throttling and on/off controller may be changed between either direct or reverse, and the control

mode may be changed between either on/off or throttling.

Refer to figure 3. Loosen the four switch retention screws on the relay. Move the switches to the control action and

control mode required by the application. Tighten the four switch retention screws.

Snap‐Acting Controller

The action of a snap‐acting controller may be changed between either direct or reverse. The control mode is always

snap acting.

Refer to figure 4. Loosen the four switch retention screws on the relay. Move the switches to the control action

required by the application. Tighten the four switch retention screws.

Instruction Manual

D103032X012

L2 Controller

July 2015

Figure 3. Fisher L2 Throttling and On/Off Controller Switch Positions for Changing Action and Control Mode

DIRECT ACTION THROTTLING

CONTROL MODE

DIRECT ACTION ON/OFF

CONTROL MODE

REVERSE ACTION ON/OFF

CONTROL MODE

REVERSE ACTION THROTTLING

CONTROL MODE

SWITCH RETENTION

SCREWS

SWITCH RETENTION

SCREWS 1

NOTE:

1 ALL FOUR SWITCH RETENTION SCREWS SHOWN ONLY ON THIS VIEW.

OTHER VIEWS SHOW ONLY TWO SWITCH RETENTION SCREWS IN ORDER TO

ILLUSTRATE THE SWITCH CONFIGURATION.

B2339

Figure 4. Fisher L2 Snap‐Acting Controller Switch Positions for Changing Action

SWITCH RETENTION

SCREWS

SWITCH RETENTION

SCREWS

DIRECT ACTION REVERSE ACTION

NOTE:

1 ALL FOUR SWITCH RETENTION SCREWS SHOWN ONLY ON THIS VIEW.

OTHER VIEWS SHOW ONLY TWO SWITCH RETENTION SCREWS IN ORDER TO

ILLUSTRATE THE SWITCH CONFIGURATION.

B2340 1

Instruction Manual

D103032X012

L2 Controller

July 2015

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

MAXIMUM SPAN (LEAST SENSITIVE) POSITION FOR

THROTTLING AND ON/OFF CONTROLLER. MINIMUM SPAN

(MOST SENSITIVE) POSITION FOR SNAP‐ACTING

CONTROLLER

MINIMUM SPAN (MOST SENSITIVE) POSITION

FOR THROTTLING AND ON/OFF CONTROLLER.

MAXIMUM SPAN (LEAST SENSITIVE) POSITION

FOR SNAP‐ACTING CONTROLLER LEVER A CONTACTING

THE DISPLACER ROD

GB0137-2

E0787

LEVER A LEVER B

SPAN LEVER GAP

Preliminary Checks

1. Check the supply pressure gauge (key 10) to be certain that the supply pressure is at the desired value. Adjust the

supply pressure as required.

2. Adjust the displacer rod to the horizontal position with the spring adjustment (key 4).

3. Bounce the end of the displacer rod (key 64, figure 7) up and down to check that the sensor is operating freely.

4. Place the span adjuster (key 9) at the desired position (see figure 5).

Instruction Manual

D103032X012

L2 Controller

July 2015

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. Lower the liquid level so that it is below the bottom of the displacer or at the lowest desired operating point on the

displacer. For interface applications, completely cover the displacer with the fluid with the lower specific gravity.

The heavier fluid should be below the bottom of the displacer or at the lowest desired operating point on the

displacer.

3. Adjust the spring adjustment (key 4) until the output pressure is 1 to 2 psig for a 3 to 15 psig output range, or 2 to 4

psig for a 6 to 30 psig output range.

Reverse‐Acting Throttling Controllers

1. Make certain the Preliminary Checks procedure at the start of this section has been completed.

2. Lower the liquid level so that it is below the bottom of the displacer or at the lowest desired operating point on the

displacer. For interface applications, completely cover the displacer with the fluid with the lower specific gravity.

The heavier fluid should be below the bottom of the displacer or at the lowest desired operating point on the

displacer.

3. Adjust the spring adjustment (key 4) until the output is 16 to 17 psig for a 3 to 15 psig output range, or 31 to 34

psig for a 6 to 30 psig output range.

Direct‐Acting On/Off and Snap‐Acting Controllers

1. Make certain the Preliminary Checks procedure at the start of this section has been completed.

2. Lower the liquid level so that it is below the bottom of the displacer or at the lowest desired operating point on the

displacer. For interface applications, completely cover the displacer with the fluid with the lower specific gravity.

The heavier fluid should be below the bottom of the displacer or at the lowest desired operating point on the

displacer.

3. Adjust the spring adjustment (key 4) until the output pressure is at full supply pressure.

4. Readjust the spring adjustment (key 4) until the output pressure goes to zero psig.

Reverse‐Acting On/Off and Snap‐Acting Controllers

1. Make certain the Preliminary Checks procedure at the start of this section has been completed.

2. Lower the liquid level so that it is below the bottom of the displacer or at the lowest desired operating point on the

displacer. For interface applications, completely cover the displacer with the fluid with the lower specific gravity.

The heavier fluid should be below the bottom of the displacer or at the lowest desired operating point on the

displacer.

3. Adjust the spring adjustment (key 4) until the output pressure goes to zero psig.

4. Readjust the spring adjustment (key 4) until the output pressure goes to full supply pressure.

Instruction Manual

D103032X012

L2 Controller

July 2015

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.

Figure 6 shows a simple schematic of the controller and sensor. In its normal position, the counterclockwise moment

due to the weight of the displacer about pivot point O is balanced by the clockwise zero spring moment and the

counterclockwise relay zero force moment applied through lever A to the displacer rod. The weight of the displacer

decreases when the liquid level increases and the subsequent buoyant force increases causing a force imbalance

between the zero spring, relay, and displacer forces. This force imbalance is transmitted to the relay by levers A and B.

The relay compensates for the force imbalance by converting it to a pressure output to a control valve and bringing the

forces back into equilibrium.

Figure 6. Operational Schematic

DISPLACER ROD

LEVER B

PROPORTIONAL

BAND ADJUSTMENT

PIVOT

POINT O

DISPLACER

LEVER A

ZERO

SPRING

RELAY

A5592

For throttling control, the relay pressure output will be proportional to the buoyant force. For on/off control, the relay

pressure output will be either zero or equal to the supply pressure over the range of liquid level change. The liquid level

change required to fully operate the relay is adjusted by sliding the proportional band adjustment along lever A to vary

the lever ratio between levers A and B.

With reverse‐acting proportional control, the principle of operation remains the same as that for direct action;

however, the controller delivers an increasing pneumatic signal to the control valve when the liquid level falls.

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