Fisher L2e User manual

www.Fisher.com
Fisher™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 (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.
Instruction Manual
D103531X012
L2e Controller
March 2017

Instruction Manual
D103531X012
L2e Controller
March 2017
2
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: [email protected]
http://www.emersonprocess.com/education

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Table 1. Specifications
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)
Jeasy-Drive™ actuator application: 7 mA@5 VDC
JOther 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
J2 NPT threaded or JNPS 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
Displacer Sizes
J48 X 305 mm, 541 cm3(17/8 X 12 inches, 33 in3)
J76 X 152 mm, 688 cm3(3 X 6 inches, 42 in3)
Maximum Displacer Insertion Length(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:
JPVC Displacer: -18 to 71°C (0 to 160°F)
JS31603 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: JPolyvinylchloride (PVC) or JS31603 SST
Sensor Spring: Stainless steel
-continued-

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Table 1. Specifications (continued)
Hazardous Area Classifications Available
Switch Only
cCSAus
Explosion-proof Class I Division 1, Groups ABCD
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
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.
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.
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), available at www.Fisher.com or from your Emerson Automation Solutions sales office.
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.
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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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. 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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L2e Controller
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Electrical Connections
WARNING
For explosionproof 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). Failure to use properly rated electrical hardware wiring and/or cable glands can
result in personal injury or property damage from fire or explosion. Wiring connections must be in accordance with local,
regional, and national codes for any given hazardous area approval. Failure to follow the local, regional, and national codes
could result in personal injury or property damage from fire or explosion.
An electrical 1/2-14 NPT conduit connection with 18 inches of 18 AWG lead wires is located at the bottom of the case.
The conduit connection is integral to the body of the switch.
The action of the controller is such that rising level will cause the Normally Closed (N/C) contacts to close and the
Normally Open (N/O) contacts to open. Falling level causes the opposite action.
Connect L2e electrical wires as shown in table 2. To reverse the action refer to table 2 and reverse wiring for normally
open and normally closed.
Table 2. L2e Electrical Wire Configuration
Wire Color SPDT Action
Red Normally Closed
Brown Common
Blue Normally Open
Green Ground

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L2e Controller
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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. When implemented as suggested, these wiring configurations provide definitive level switch points
and help reduce issues associated with single pole single throw contact switches, such as “bouncing” due to vibration
or sloshing liquids in a vessel.
Note
Use with easyDrive electric actuator after first being used in other high power application is not recommended.
CLOSE
OPEN
Figure 3. Local Level Control with Direct Connection to easy-Drive Actuator without Remote Monitor
BROWN
RED
BLUE
12/24 VDC
POWER SUPPLY
easy-Drive ACTUATOR
POWER AND CONTROL TERMINAL
X0661
1
GREEN (GND)
1 CONNECT GREEN WIRE TO ACTUATOR GROUND (NOT SHOWN)
2 OPEN CONTACT (2) MAY BE LABELED N.O. AND CLOSE CONTACT (3) MAY BE LABLED N.C.
2
W9795-4
REMOVE COVER TO
ACCESS POWER AND
CONTROL TERMINAL
easy-Drive ACTUATOR WITH
FISHER D3 CONTROL VALVE

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L2e Controller
March 2017
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BROWN
RED
BLUE
RED
BLUE
BROWN
DISCRETE INPUT CONFIGURED FOR DRY CONTACT CLOSURE EXTERNALLY POWERED
12/24 VDC
POWER SUPPLY
easy-Drive ACTUATOR
POWER AND CONTROL TERMINAL
ROC809 DI MODULE
X0661
CLOSE
OPEN
1 CONNECT GREEN WIRE TO ACTUATOR GROUND (NOT SHOWN)
2 OPEN CONTACT (2) MAY BE LABELED N.O. AND CLOSE CONTACT (3) MAY BE LABLED N.C.
1
2
GREEN (GND)
REMOVE COVER TO
ACCESS POWER AND
CONTROL TERMINAL
W9795-4
easy-Drive ACTUATOR WITH
FISHER D3 CONTROL VALVE
Figure 4. Local Level Loop Control with Direct Connect to easy-Drive Actuator
with ROC809 Remote Monitor

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W9795-4
Figure 5. Local Level Loop Control with Direct Connect to easy-Drive Actuator
with FloBoss 107 Remote Monitor
BROWN
RED
BLUE
RED
BLUE
BROWN
DISCRETE INPUT CONFIGURED FOR DRY CONTACT CLOSURE EXTERNALLY POWERED
12/24 VDC
POWER SUPPLY
FloBoss 107 AI/DI MODULE OR
FloBoss 107 DIs ON CPU
MODULE'S OPTIONAL I/O ASSEMBLY
X0661
CLOSE
OPEN
1 CONNECT GREEN WIRE TO ACTUATOR GROUND (NOT SHOWN)
2 OPEN CONTACT (2) MAY BE LABELED N.O. AND CLOSE CONTACT (3) MAY BE LABLED N.C.
1
GREEN (GND)
2
REMOVE COVER TO
ACCESS POWER AND
CONTROL TERMINAL
easy-Drive ACTUATOR
POWER AND CONTROL TERMINAL
easy-Drive ACTUATOR WITH
FISHER D3 CONTROL VALVE

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L2e Controller
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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. Move Zero and Span Adjustment for desired liquid zero position and level DG.
3. Tighten the Zero Adjustment hex nut (key 5), shown in figure 7, to lock the Zero setting.
Note
Scan the QR code shown in figure 6 or on the inside cover of the L2e for electric level loop field support.
Figure 6. Initial Setup
GG11109

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L2e Controller
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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). Levers A and B are arranged and connected by movable pivot or span adjustment so
that the resultant movement between the plunger and the switch can be adjusted. For a given change in displacer
movement the span adjustment will increase or decrease a proportional change in the plunger movement. As fluid
level rises, the plunger moves away from the switch and vice versa.
Figure 7. Fisher L2e Controller
SWITCH
SPAN
ADJUSTMENT
LEVER B
GG10047
w/Displacer Rod
PLUNGER
FACTORY SET - DO NOT ADJUST
LEVER A
CONTROLLER MOUNTING
SCREWS (KEY 24)
ZERO SPRING
(KEY 7)
ZERO ADJUSTMENT
DISPLACER
ROD (KEY 64)
ZERO ADJUSTMENT
HEX NUT (KEY 5)

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L2e Controller
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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. To avoid personal injury or property damage caused by the release of pressure or process fluid, observe the
following before starting maintenance:
D Provide some temporary means of control for the process before taking the controller out of service.
D Provide a means of containing the process fluid before removing any measurement devices from the process.
D Vent any trapped process pressure.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Removing the Controller From the Sensor
Refer to figure 7 for key number locations unless otherwise indicated.
1. Disconnect power from any electrical source.
2. Slide the hook end of the zero spring (key 7) over and off the controller end of the displacer rod (key 64).
3. Remove the four controller mounting screws (key 24), and pull the controller straight away from the sensor.
Installing Sensor Repair Kit (RL2SENSX012)
Refer to figure 9 for key number locations unless otherwise indicated.
Disassembly
1. Remove the controller from the sensor by following the procedure outlined in the previous section.
2. Remove the sensor from the vessel.
3. Unscrew the hex nut (key 67) and remove the spacer (key 66) and spring (key 68). After removing the spring,
replace the spacer (key 66) and hex nut (key 67) on the displacer rod.
From the displacer end, pull the displacer rod away from the sensor connection (key 65) to pull the pivot base
(key 73) loose from the sensor connection. Remove the hex nut (key 67) to permit removing the displacer rod, pivot
base, pivot body, and spacer from the sensor connection.
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.

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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 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. Apply silicone sealant (key 79) to the O-ring (key 74) and slide onto the displacer rod assembly (key 64) with the
antiextrusion ring (key 75) and retaining ring (key 76). Be sure the Oring, antiextrusion ring, and retaining ring are
in the order shown in figure 9. Slide the pivot base onto the displacer rod so that the knife edges of the pivot body
(key 72) engage the slots in the pivot base (key 73).
3. Apply silicone sealant (key 79) to the O-ring (key 77) and install with the backup ring (key 78) into the groove on the
pivot base (key 73). Be sure the backup ring is on the process pressure side of the Oring as shown in
figure 9.
4. Insert the displacer rod (key 64) into the vessel side of the sensor connection (key 65).
5. The pivot base must seat in the slots cast in the sensor connection. These slots will be horizontal when the sensor
connection (key 65) is oriented as shown in figure 2.
6. To reduce the possibility of nicking the Oring key (77) on the pivot base, keep the displacer rod centered in the
sensor connection as much as possible while pushing the pivot base into the sensor connection. Be sure the pivot
base seats in the slots cast in the sensor connection.
7. Slide the spring (key 68) and spacer (key 66) onto the displacer rod and secure with the hex nut (key 67). Fully
tighten the hex nut (key 67).
8. Examine the sensor to ensure that the two pivot knife edges are seated in the pivot base slots.
9. Install the sensor on the vessel.
Replacing the Complete Controller Assembly (RL2E0X00C12)
Refer to figure 7 for key number locations unless otherwise indicated.
1. Disconnect power from any electrical source.
2. Slide the hook end of the zero spring (key 7) over and off the controller end of the displacer rod (key 64)
3. Remove the four controller mounting screws (key 24) and pull the controller straight away from the sensor.
4. Install the new controller assembly on the sensor.
5. Mount with the four screws (key 24).
6. Slide the hook end of the zero spring (key 7) on the controller end of the displacer rod (key 64).
7. Complete signal wiring hookup to easy-Drive electric actuator.
8. Perform the Initial Setup (Dry Displacer) and Zero and Span Adjustment procedures found on page 10.
Note
Use with easyDrive electric actuator after first being used in other high power application is not recommended.

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D103531X012
L2e Controller
March 2017
14
Related Documents
D Bulletin 34.2:L2e Fisher L2e Electric Level Controller (D103532X012)
D Changing easy-Drive Electric Actuator On/Off Input Configuration from Single Dry Contact Control to Dual Dry
Contact Control—Supplement to L2e Electric Level Controller Instruction Manual (D103987X012)
D Converting a Threaded NPT Connection to a Flange Connection—Supplement to Fisher L2, L2e, and L2sj Liquid Level
Controller Instruction Manuals (D103277X012)
D Dimensions for NPS 2 CL150 through 1500 Slip On Flange Connections—Supplement to Fisher L2, L2e, and L2sj
Liquid Level Controller Instruction Manuals (D103405X012)
D Bulletin 51.2:D3 Fisher D3 Control Valve (D103269X012)
D Fisher D3 Control Valve with easy-Drive Electric Actuator Instruction Manual (D103460X012)
D Bulletin 51.2:D4 Fisher D4 Control Valve Assembly (D103039X012)
D Fisher D4 Control Valve with easy-Drive Electric Actuator Instruction Manual (D103597X012)
All documents are available from your Emerson Automation Solutions sales office. Also visit our website at
www.Fisher.com.
Parts Ordering
When corresponding with your Emerson Automation Solutions sales office about this equipment, always mention the
serial number of the controller. The serial number can be found on the nameplate.
WARNING
Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Automation Solutions should
not, under any circumstances, be used in any Fisher instrument. Use of components not supplied by Emerson Automation
Solutions may void your warranty, might adversely affect the performance of the valve, and could cause personal injury or
property damage.
Kits
Description Part Number
Sensor Repair Kit
Repair kit includes keys 74, 75, 76, 77, and 78
(fluorocarbon O‐rings, anti‐extrusion ring,
retaining ring, and fluorocarbon backup ring) RL2SENSX012
Description Part Number
Controller Assembly Replacement
Replacement kit includes complete controller
assembly (figure 8) with mounting screws
and gasket RL2E0X00C12

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Figure 8. Fisher L2e Electric Level Controller Assembly
GG10047-E
Parts List
Key Description
Note
Contact your Emerson Automation Solutions sales office for Part
Ordering information.
Sensor (see figure 9)
63 Hex jam nut, 316 SST
64 Displacer rod, 17‐4 SST (17‐4PH SST)
65 Sensor connection
66 Spacer, 304 SST
67 Hex jam nut, 316 SST
68 Conical spring, 316 SST
69 Universal Joint, 316 SST (vertical displacer only)
70 Nameplate
71 Drive screw, stainless steel
72 Knife pivot body, CB7CU‐1 (17‐4PH SST)
73 Knife pivot base, CF8M (316 SST)
Key Description
Note
Keys 74, 75, 76, 77, and 78 are included in the Sensor Repair Kit.
74 O‐Ring, fluorocarbon
75 Anti‐extrusion ring, PTFE
76 Retaining ring, 304 SST
77 O‐Ring fluorocarbon
78 Backup ring, fluorocarbon
79 Sealant, silicone
(not furnished with sensor)
81 Displacer,
1‐7/8x12‐inches
PVC
S31603
3x6-inches
PVC
82 Extension
3 inches
6 inches
89 NACE Label

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Figure 9. Sensor
SECTION A-A
A
A
CC
B
VIEW B-B
SCALE 2:1 SECTION C-C
SCALE 2:1
jAPPLY LUB/SEALANT
GG12263-B
Emerson Automation Solutions
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Cernay, 68700 France
Dubai, United Arab Emirates
Singapore 128461 Singapore
www.Fisher.com
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not
to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such
products at any time without notice.
E2013, 2017 Fisher Controls International LLC. All rights reserved.
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.
Neither Emerson, Emerson Automation Solutions, 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.