Fisher L2e Instruction Manual

Instruction Manual

D103531X012

Fisher™ L2e Electric Level Controller

L2e Controller

March 2017

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 (RL2E0X00C12) 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 Automation Solutions sales

office before proceeding.

www.Fisher.com

L2e Controller

March 2017

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. The difference between the upper trip point and the zero or lower trip point is called differential gap or DG. The
L2e operates as a two position (on-off) controller.

These controllers use a single pole double throw (SPDT) dry contact electric switch to provide differential gap (DG)
control or liquid monitoring. The controller can be used to provide an electric control signal to an electrically actuated
control 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 L2e electric liquid level controllers, as well as a variety of other products,
contact:

Emerson Automation Solutions
Educational Services - Registration
Phone: [phone] or [phone]
Email: [e-mail]
http://www.emersonprocess.com/education

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Instruction Manual

D103531X012

Table 1. Specifications

L2e Controller

March 2017

Available Configurations

Controller: Differential gap (DG) electric control
action with intuitive Zero and Span Adjustments in
SPDT dry contact configuration (refer to page 2 for
differential gap description)
Sensor: Displacertype liquid level sensor for
mounting to side of vessel

Input Signal

Type: Liquid level or liquidtoliquid interface

Level Change Required for Full Change in State of
Output: 5.0 to 305 mm (0.2 to 12 inches)

Vessel level DG is dependant on factors such as valve
sizing, actuator speed, rate, liquid out flow, and
vessel size. Contact your Emerson Automation

Solutions sales office for Fisher Electric Level Loop

performance optimization.

Specific Gravity Limits

Minimum SG: 0.15
Maximum SG

PVC Displacer: 1.3
SST Displacer: 1.1

Electrical Rating (Output)

J easy-Drive™ actuator application: 7 mA@5 VDC
J Other applications: 1 amp resistive, 0.5 amp

inductive/28 VDC
Note: Use with easy-Drive after first being used in

other high power application is not recommended.

Power Consumption

Switch consumes no power to operate, so it has no
current leakage or voltage drop

Sensor to Vessel Connection

J 2 NPT threaded or J NPS 2 CL150 through 1500

slipon flange connection

(1)

Controller Connection

Electrical 1/2-14 NPT external conduit connection
with 18 inches of 18 AWG lead wires, located at the
bottom of the case

-continued-

Displacer Sizes

J 48 X 305 mm, 541 cm
J 76 X 152 mm, 688 cm

Maximum Displacer Insertion Length

3

(17/8 X 12 inches, 33 in3)

3

(3 X 6 inches, 42 in3)

(2)

, Horizontal

or Vertical

1-7/8 x 12 Displacer with one 6-inch extension
(optional use)
3 x 6 Displacer with one 3-inch extension
(optional use)

Displacer Material and Maximum Sensor Working
Pressure

(3)

PVC Displacer: Consistent with CL1500 pressure
temperature ratings per ASME B16.34 up to
maximum pressure of 258.5 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

Operative Ambient Temperature Limits

(3)

Controller: 40 to 75°C (40 to 167°F)

Operative Process Temperature Limits

(3)

Sensor:
 J PVC Displacer: -18 to 71°C (0 to 160°F)
 J S31603 SST Displacer: 40 to 204°C (40 to 400°F)

Construction Materials

Controller

Case and Cover: Marine grade aluminum
Switch: Stainless steel
Span Levers: Stainless steel
Springs: Stainless steel

Sensor

Sensor Body: LCC
ORings: Fluorocarbon
Pivot Assembly: Stainless steel
Displacer: J Polyvinylchloride (PVC) or J S31603 SST
Sensor Spring: Stainless steel

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L2e Controller

March 2017

Table 1. Specifications (continued)

Instruction Manual

D103531X012

Hazardous Area Classifications Available

Switch Only

cCSAus

Explosion-proof Class I Division 1, Groups ABCD

Canadian Registration (CRN)

The L2e utilizes the same sensor unit pressure
component as the L2 pneumatic controller version.
Refer to the L2 CRN which is deemed applicable to
the L2e.

Dust Ignition-proof Class II Division 1, Groups EFG
Dual Seal

ATEX II 2 GD
Flameproof Ex d IIC T6 (Ta=40°C to + 75°C)
Dust Ex tb IIIC T85°C Db IP6X (Ta = 40° to +75°C)
1 A Max

IECEx

Flameproof Ex d IIC T6 (Ta=40°C to + 75°C)
Dust Ex tb IIIC T85°C Db IP6X (Ta = 40° to +75°C)
1 A Max

NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1  Process Instrument Terminology.

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

2. Maximum span setting with 1 7/8 x 12 inch horizontal displacer plus 6 inch extension is not recommended due to potentially insufficient zero adjustment.

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

), available at www.Fisher.com or from your Emerson Automation Solutions sales office.

Declaration of SEP

Fisher Controls International LLC declares this
product to be in compliance with Article 4 paragraph
3 of the PED Directive 2014/68/EU. 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.

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.

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 L2e electric 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
instrument and or 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.

Note

Use with easyDrive electric actuator after first being used in other high power application is not recommended.

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Instruction Manual

D103531X012

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.

L2e Controller

March 2017

Attaching a Vertical Displacer

Refer to figure 9 for part locations.

1. Thread jam nut (key 63) 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 against the displacer.

Attaching a Horizontal Displacer

Refer to figure 9 for part locations.

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

Attaching the Sensor to the Vessel

Insert the displacer end of the L2e sensor into the vessel connection and tighten enough to seal the threads. If
necessary, loosen or tighten slightly to obtain the horizontal orientation shown in figure 2. Make sure that the
controller case is level.

CAUTION

The displacer rod (key 64) is not a handle. Grasp sensor body or controller housing to lift and carry to avoid internal
component damage.

Figure 2. Sensor Orientation

CORRECT CONTROLLER MOUNTING

HOLE ORIENTATION WHEN MOUNTED ON VESSEL

A6639

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