Instruction Manual
D103531X012
Fisher™ L2e Electric Level Controller
L2e Controller
June 2022
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........................
Seal Certification 10........................
L2e Initial Setup (Dry Displacer) 11...............
L2e Zero and Span Adjustment (Wet Displacer) 11..
Principle of Operation 12........................
Maintenance 14................................
Removing the Controller From the Sensor 14......
Installing Sensor Repair Kit (RL2SENSX012) 14.....
Replacing the Complete Controller
Assembly (RL2E0X00C22) 15.................
Related Documents 16..........................
Parts Ordering 16...............................
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 sales office
www.Fisher.com
before proceeding.
L2e Controller
June 2022
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 between 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.
The instrument uses an electronic switch (solid state relay) that provides one Normally Closed (NC) and one Normally
Open (NO) contact. The electronic switch can be used to provide liquid monitoring or to provide differential gap (DG)
control by operating an electrically-actuated valve.
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
2
Instruction Manual
D103531X012
Table 1. Specifications
L2e Controller
June 2022
Available Configurations
Controller: Differential gap (DG) electric control
action with intuitive Zero and Span Adjustments
(refer to page 2 for differential gap description)
Sensor: Displacertype liquid level sensor for
mounting to side of vessel
Input Signal
Type: Liquid level or liquidtoliquid interface
Level Change Required for Full Change in State of
Output: 5.0 to 305 mm (0.2 to 12 inches)
Dynamic differential gap for the level in the vessel
depends on factors such as valve sizing, actuator
speed, molecular weight, pressure, and temperature
of process fluids, input flow rate, and vessel size.
Specific Gravity Limits
Minimum SG: 0.15
Maximum SG
PVC Displacer: 1.3
SST Displacer: 1.1
Switch Contact Electrical Rating
1 amp resistive, 0.5 amp inductive/28 VDC; contacts
are not polarity sensitive
Note: The easy-Drive
™ actuator application draws
7 mA through the L2e contacts @ 5 VDC
Power Requirements
Voltage: 9 - 30 VDC
Maximum Input Voltage Ripple: 400 mV
Current draw:
Less than 15 mA steady state
Less than 500 mA peak startup or switching transient
Sensor to Vessel Connection
J 2 NPT threaded or J NPS 2 CL150 through 1500
slipon flange connection
(1)
Controller Connection
Electrical 1/2-14 NPT external conduit connection
with 0.5 m (greater than 18 inches) of 18 AWG lead
wires, located at the bottom of the case
-continued-
Displacer Sizes
3
J 48 X 305 mm, 541 cm
J 76 X 152 mm, 688 cm
Maximum Displacer Insertion Length
(17/8 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 Mechanical
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 slipon flange connection, maximum sensor
working pressure must be consistent with the flange
ratings
Operative Ambient Temperature Limits
(3)
Controller: 40 to 85°C (40 to 185°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: Aluminum 6061T
Switch Body Internal O-ring: Fluorosilicone Rubber
Span Levers: Stainless steel
Springs: Stainless steel
Sensor
Sensor Body: LCC
ORings: Fluorocarbon
Pivot Assembly: Stainless steel
Displacer: J Polyvinylchloride (PVC) or J S31603 SST
Sensor Spring: Stainless steel
3
L2e Controller
June 2022
Table 1. Specifications (continued)
Instruction Manual
D103531X012
Hazardous Area Classifications Available
Switch Only
Refer to D104234X012 for Special Conditions of Safe
Use
Refer to to GH04148 instruction manual
(D104234X012) for switch information
Canadian Registration (CRN)
cCSAus
Explosion-proof Class I Division 1, Groups ABCD
Dust Ignition-proof Class II Division 1 2, Groups EFG
Single Seal
(4)
ATEX II 2 GD
Flameproof Ex d IIC T5 (Ta ≤ @85°C) /
T6 (Ta≤ @ 78°C)
Dust Ex tb IIIC T92°C / T85°C Db IP6X
1 A Max
IECEx
Flameproof Ex d IIC T5 (Ta ≤ @85°C) /
T6 (Ta≤ @ 78°C)
Dust Ex tb IIIC T92°C / T85°C Db IP6X
1 A Max
Ingress Protection Rating per IEC 60529: IP66
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.
4. Electronic switch pressure rating is based on maximum pressure at sensor. Controller housing vent is designed to drop maximum process pressure to less than 6.9 bar (100 psig) at switch.
), available at Fisher.com or from your Emerson sales office.
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.
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 pressurelimiting or pressurerelieving 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.
NOTICE
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.
4
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
Attaching a Vertical Displacer
Refer to figure 12 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 12 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
June 2022
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.
NOTICE
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
5
L2e Controller
June 2022
Instruction Manual
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). 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 0.5 meters (greater than 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 Electronic Switch has Normally Closed (NC) and Normally Open (NO) outputs. The Switch electronics is housed in
Explosion/Flame proof and dust explosion proof enclosure.
The action of the controller is such that the switch contacts activate a dump valve when the fluid level exceeds the
high trip point, and remain in that state until the level falls below the low trip point. At the low trip point the switch
contacts de-activate or close the dump valve. The contacts remain in that state until the level builds up to the high trip
point again.
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 Color Code
Wire Color Description
White/Red DC Supply +
White/Black DC Supply -
Red Normally Closed Contact
Brown Common Contact
Blue Normally Open Contact
Green Ground (Housing, Safety)
6
Loading...