Emerson Fisher L2 User manual

www.Fisher.com
D103032X012
Type L2 Liquid Level Controllers
Contents
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scope of Manual 1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Description 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Attaching Vertical Displacer 3. . . . . . . . . . . . . . . . .
Attaching Horizonal Displacer 3. . . . . . . . . . . . . . .
Screwed Connections 3. . . . . . . . . . . . . . . . . . . . . .
Pressure Connections 4. . . . . . . . . . . . . . . . . . . . . .
Vent 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing Controller Action or Mode 4.
Throttling and On/Off Controllers 4. . . . . . . . . . . . .
Snap-Acting Controller 4. . . . . . . . . . . . . . . . . . . . .
Proportional Band Adjustment 4. . . . . . . .
Preliminary Checks 6. . . . . . . . . . . . . . . . . . . . . . . .
Direct-Acting Throttling Controllers 6. . . . . . . . . . .
Reverse-Acting Throttling Controllers 7. . . . . . . . .
Direct-Acting On/Off and
Snap-Acting Controllers 7. . . . . . . . . . . . . . . . . .
Reverse-Acting On/Off and
Snap-Acting Controllers 7. . . . . . . . . . . . . . . . . .
Principle of Operation 7. . . . . . . . . . . . . . . . . .
Maintenance 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Controller From the Sensor 8. . . . .
Replacing the Sensor O-Rings 8. . . . . . . . . . . . . . .
Disassembly 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assembly 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Controller Relay 10. . . . . . . . . . . . .
Replacing the Controller Supply Filter 10. . . . . . .
Parts Ordering 10. . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Kits 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controller 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sensor 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1. Type L2 Liquid Level Controller
W8345
Introduction
Scope of Manual
This instruction manual includes installation,
adjustment, maintenance, and parts ordering
information for Type L2 liquid level controllers.
Only personnel qualified through training or
experience should install, operate and maintain this
controller. If there are any questions regarding the
instructions in this manual, contact your Fisher sales
office before proceeding.
Description
The rugged Type 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.
Instruction Manual
Form 5732
December 2001 Type L2

Type L2 Instruction Manual
Form 5732
December 2001
2
Table 1. Specifications
Available Configurations
Controllers: 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(1)
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, Direct Action,
and Standard 48 x 305 mm (1-7/8 X 12-Inch)
Vertical Displacer with Standard Lever Arm
Length:
Control
Mode
Maximum Proportional
Band Level Change,
mm (Inches)
Minimum Proportional
Band Level Change,
mm (Inches)
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 note 3)
Snap-Acting Controllers: Minimum specific
gravity, or specific gravity differential for interface
applications, is 0.1
Output Signal(1)
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)
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
Standard Displacer Size
48 x 305 mm, 541 cm3(1-7/8 x 12 inches, 33 in3)
Maximum Displacer Working Pressure(4)
258 bar (3750 psig)
Maximum Displacer Insertion Length
Standard lever arm length plus one 6-inch
extension, horizontal or vertical
Sensor to Vessel Connection
51 mm (2-inch) screwed (NPT)
Maximum Sensor Working Pressure(4)
Consistent with Class 1500 pressure temperature
ratings per ASME B16.34 up to maximum
pressure of 258 bar (3750 psig)
Operative Ambient Temperature Limits(1)(4)
Controller: –29 to 71_C (–20 to 160_F)
Sensor Temperature Limits(1)(4)
Displacer –29 to 79_C (–20 to 175_F)
O-Rings: –40 to 204_C (–40 to 400_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
Controller Connections
Supply: 1/4 in. NPT female located on the bottom
of the case
Output: 1/4 in. NPT female located on the top of
the case
Case Vent: 1/4 in. NPT female with vent screen
assembly located on the back of the case
1. This term is defined in ISA Standard S51.1.
2. Depends on float rod/displacer orientation and length. Contact your Fisher sales office 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 Fisher sales office for displacer
sizing information.
4. The pressure and temperature limits in this document and any applicable code limitations should not be exceeded.
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).

Type L2
Instruction Manual
Form 5732
December 2001
3
These low-bleed controllers use a single four-mode
relay to provide the applicable control and action.
The device delivers a pneumatic output signal to a
control valve.
Specifications
Specifications for the controller and sensor are listed
in table 1.
Installation
WARNING
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.
CAUTION
If the Type 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.
3. If necessary, reinforce the tank connection so that it
will be capable of supporting the sensor and controller.
Attaching a Vertical Displacer
Refer to figure 7 for part locations.
Figure 2. Sensor Orientation
CORRECT CONTROLLER MOUNTING
HOLE ORIENTATION WHEN
MOUNTED ON VESSEL
A6639 / IL
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).
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.

Type L2 Instruction Manual
Form 5732
December 2001
4
Pressure Connections
WARNING
Personal injury or property damage may
result from an uncontrolled process if
the supply medium is not clean, dry,
oil-free, or non-corrosive gas. Industry
instrument air quality standards
describe acceptable dirt, oil, and
moisture content. Due to the variability
in nature of the problems these
influences can have on pneumatic
equipment, Fisher has no technical
basis to recommend the level of
filtration equipment required to prevent
performance degradation of pneumatic
equipment. A filter or filter regulator
capable of removing particles 40
microns in diameter should suffice for
most applications. Use of suitable
filtration equipment and the
establishment of a maintenance cycle to
monitor its operation is recommended.
1. Provide a source of clean, dry air that meets the
requirements of ISA Standard S7.3 as the operating
medium. Refer to table 1 to determine supply
pressure.
2. Connect the supply pressure to the 1/4-inch NPT
female connection on the bottom of the controller
case.
3. Connect the output signal line to the equipment
being operated and to the 1/4-inch NPT output
connection on the top of the controller case.
Vent
WARNING
If a flammable, toxic, corrosive, or
reactive 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
toxic, corrosive, or reactive 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. 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 1/2-inch (13 mm) 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.
Proportional Band 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.

Type L2
Instruction Manual
Form 5732
December 2001
5
Figure 3. Type 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
NOTE: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.
1
B2339 / IL
1
1
Figure 4. Type L2 Snap-Acting Controller Switch Positions for Changing Action
SWITCH RETENTION
SCREWS
SWITCH RETENTION
SCREWS
DIRECT ACTION REVERSE ACTION
NOTE: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.
1
B2340 / IL

Type L2 Instruction Manual
Form 5732
December 2001
6
Figure 5. Proportional Band Adjustments
LEAST SENSITIVE POSITION FOR THROTTLING AND ON/OFF CONTROLLER.
MOST SENSITIVE POSITION FOR SNAP-ACTING CONTROLLER
MOST SENSITIVE POSITION FOR THROTTLING
AND ON/OFF CONTROLLER. 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).
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

Type L2
Instruction Manual
Form 5732
December 2001
7
operating point on the displacer. For interface
applications, completely cover the displacer with the
lighter fluid. 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
lighter fluid. 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
lighter fluid. 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
lighter fluid. 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.
Principle of Operation
The operation of Type 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.
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.

Type L2 Instruction Manual
Form 5732
December 2001
8
Figure 6. Operational Schematic
DISPLACER ROD
LEVER B
PROPORTIONAL
BAND ADJUSTMENT
PIVOT POINT O
DISPLACER
LEVER A
ZERO SPRING
RELAY
A5592 / IL
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.
Due to the care Fisher takes in meeting all
manufacturing requirements (heat treating,
dimensional tolerances, etc.), use only replacement
parts manufactured by Fisher.
WARNING
To avoid personal injury or property
damage caused by the release of
pressure or process fluid, observe the
following before starting maintenance:
DProvide some temporary means
of control for the process before
taking the controller out of service.
DProvide a means of containing the
process fluid before removing any
measurement devices from the
process.
DVent any trapped process
pressure.
Removing the Controller From the
Sensor
Observe the warning given at the start of the
“Maintenance”section.
1. Disconnect the supply and output pressure lines.
2. Slide the hook end of the zero spring (key 5,
figure 8) over and off the controller end of the
displacer rod (key 64, figure 7).
3. Remove the four controller mounting screws
(key 11, figure 8), and pull the controller straight
away from the sensor.
Replacing the Sensor O-Rings
Observe the warning given at the start of the
“Maintenance”section. Refer to figure 7 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 tank.
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.

Type L2
Instruction Manual
Form 5732
December 2001
9
Figure 7. Sensor
GB0139–A
VIEW
C Ć C
VIEW B
SECTION A Ć A
C
C
AA
B

Type L2 Instruction Manual
Form 5732
December 2001
10
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.
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. Slide the O-ring (key 74), anti-extrusion ring
(key 75) and retaining ring (key 76) onto the
displacer rod assembly (key 64). Be sure the O-ring,
anti-extrusion ring, and retaining ring are in the order
shown in
figure 7. Slide the pivot base onto the displacer rod
so that the points of the pivot body (key 72) will
engage the slots in the pivot base (key 73).
3. Install the O-ring (key 77) and backup ring (key
78) into the groove on the pivot base (key 73). Be
sure the backup ring is on the downstream pressure
side of the O-ring as shown in figure 7.
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. View the sensor connection from the vessel side.
Ensure that the pivot body arms remain aligned with
the pivot base arms (the two pivot body points are
seated in the pivot base slots).
9. Install the sensor on the tank.
Replacing the Controller Relay
Observe the warning given at the start of the
“Maintenance”section. Refer to figure 8 for key
number locations unless otherwise indicated.
1. Disconnect the supply and output pressure lines.
2. Remove the two relay mounting screws (key 33),
and pull the relay away from the controller base
(key 1).
3. Install the new relay using two relay mounting
screws (key 33). Make certain that the relay
mounting O-rings (keys 43 and 44, not shown) are
completely in their mounting bosses before installing
the relay. Make certain span lever B (see figure 5) is
in line with and pushing in on the end of either the
relay adjustment screw (key 49, throttling controller)
or the pilot valve plug of the valve assembly (key 51,
snap-acting controller).
Replacing the Controller Supply Filter
Observe the warning given at the start of the
“Maintenance”section. Refer to figure 8 for key
number locations unless otherwise indicated.
1. Disconnect the supply and output pressure lines.
2. Loosen the filter cap screws (key 17), and rotate
the filter cap (key 14) to the side to uncover the
supply filter (key 15).
3. Remove the old filter (key 15), and remove any
debris from the filter boss.
4. Install a new supply filter. Reinstall the filter cap
(key 14), and tighten the filter cap screws (key 17).
Parts Ordering
When corresponding with your Fisher sales office
about this equipment, always mention the serial
number of the controller. The serial number can be
found on the nameplate (key 55, figure 8). When
ordering replacement parts, also specify the
complete 11-character part number of each part
required as found in the following parts list.

Type L2
Instruction Manual
Form 5732
December 2001
11
Figure 8. Type L2 Liquid Level Controllers
VIEW AĆA
SNAPĆACTING CONTROLLER
THROTTLING AND ON/OFF
CONTROLLER RELAY ASSY
jAPPLY LUB/SEALANT
GB0137–2
SNAP-ACTING
CONTROLLER
RELAY ASSEMBLY
THROTTLING AND ON/OFF CONTROLLER
A
A

Type L2 Instruction Manual
Form 5732
December 2001
12
Parts Kits
Key Description Part Number
Controller
Repair kit includes O-rings (keys 13 and 16) and
gaskets (keys 18, 21, and 23) RL2CNTRX012
Relay
Repair kits include relay assembly,
relay mounting screws (key 33), and
O-rings (keys 33, 43, and 44)
Throttling and On/Off Controller GB0138 X0012
Snap-Acting Controller GB0138 X0022
Sensor
Repair kit includes keys 74, 75, 77, and 78
(fluoroelastomer O-rings, anti-extrusion ring,
and fluoroelastomer backup ring) RL2SENSX012
Parts List
Note
For part numbers not shown, contact your Fisher
sales office.
Controller
1 Controller Base, marine grade aluminum
2 Zero Spring Seat, 316 SST
3 Zero Adjustment Bolt, stainless steel
4 Spring Adjustment, 316 SST
5 Zero Spring, 17-7PH SST
6 Span Lever Assembly, stainless steel
7 Shoulder Screw, stainless steel (2 req’d)
8 Flanged Bearing, nylon (4 req’d)
9 Span Adjustor, stainless steel
10 Pressure Gauge (2 req’d)
11 Mounting Screw, stainless steel (4 req’d)
12 Cover Screw, stainless steel
13* O-Ring, nitrile
14 Filter Cap, reinforced plexiglass
15 Filter 11B2307 X012
16* O-Ring, nitrile
17 Machine Screw, stainless steel (2 req’d)
18* Sensor Gasket, composition
19 Cover, marine grade aluminum
20 Cover Lens, plexiglass (2 req’d)
Key Description Part Number
21* Gasket, neoprene (2 req’d)
22 Retaining Ring, steel (2 req’d)
23* Cover Gasket, nitrile
33 Relay Mounting Screw, stainless steel
(2 req’d)
43* Relay Mounting O-Ring, nitrile (not shown)
44* Relay Mounting O-Ring, nitrile (not shown)
49 Relay Adjustment Screw
51 Valve Assembly
52 Valve Assembly O-Ring
53 Label, setup and calibration
54 Self-Tapping Screw, stainless steel (2 req’d)
55 Nameplate
56 Screen, stainless steel
57 Hex Nut, stainless steel
60 Sealant Zinc-plate No. 770
(not furnished with controller)
61 Lubricant, Dow Corning 111
(not furnished with controller)
62 Sealant, Loctite No. 222
(not furnished with controller)
Sensor
81 Displacer, PVC
1-7/8x12-inches 12B2936 X032
63 Hex Nut, 316 SST
64 Displacer Rod, 17–4 SST (17-4PH SST)
65 Sensor Connection
66 Spacer, 304 SST (304 SST)
67 Hex Nut, 316 SST
68 Conical Spring, 316 SST
69 Universal Joint, 316 SST (vert displ only)
70 Nameplate
71 Drive Screw, stainless steel
72 Pivot Body, CB7CU-1 (17-4PH SST)
73 Pivot Base, CF8M (316 SST)
74* O-Ring, fluoroelastomer
75* Anti-Extrusion Ring, PTFE
76 Retaining Ring, 304 SST
77* O-Ring, fluoroelastomer
78* Backup Ring, fluoroelastomer
79 Lubricant, Lubriplate Mag-1
(not furnished with sensor)
80 Instruction Tag
82 Extension, S31600 12B2953 X022
*Recommended spare parts
Fisher
Marshalltown, Iowa 50158 USA
Cernay 68700 France
Sao Paulo 05424 Brazil
Singapore 128461
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. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.
EFisher Controls International, Inc. 2001; All Rights Reserved
Fisher is a mark owned by Fisher Controls International, Inc., a business of Emerson Process Management. The Emerson logo is a trademark and service mark of Emerson Electric Co.
All other marks are the property of their respective owners.
Emerson Process Management
www.Fisher.com