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L2 Controller
D103034X012
Fisher
r
L2 Liquid Level Controller
The rugged Fisher L2 liquid level controller uses a displacer type sensor to detect liquid level or the interface of two liquids of different specific gravities.
This controller is ideal for controlling level on gas separators and scrubbers. The reliability of the L2 design makes it well suited for liquid level applications in natural gas production, compression, and processing. The device delivers a pneumatic output signal to a control/dump valve. The sensor uses a threaded 2 NPT or an NPS 2 CL150 through 1500 slip-on flange connection to the vessel.
Product Bulletin
34.2:L2
September 2013
Features
n More Reliable Control—Two-stage proportional relay with integral action provides more dependable liquid level control.
n Snap-Acting or Throttling Control—One standard controller available as either throttling or snap-acting.
n Vibration Resistant Sensor Dynamics— O-ring friction and process pressure sensitivity are minimal. Performance stays constant with process pressure changes and controller remains vibration resistant.
n NACE Service Ready—Standard construction uses materials that comply with the requirements of
NACE MR0175-2002.
n Field-Configurable Vertical or Horizontal
Displacer—Displacer may be adjusted in the field for vertical or horizontal operation without additional parts.
n Field-Reversible Output—The controller can be adjusted in the field for direct or reverse action without additional parts. The controller also has adjustable gain sensitivity.
W8418-1 n CL1500 Pressure Rating—Sensor assembly is designed and specified for ASME B16.34 CL1500 service when using a Polyvinylchloride (PVC) displacer. For PED (97/23/EC) maximum pressure is limited to 200 bar (2900 psig).
n Vent-Away Case—The ability to pipe away exhaust permits using natural gas as the operating medium.
n Easy Maintenance—Both the controller and the sensor can be easily disassembled to inspect the process seals and for maintenance.
www.Fisher.com
Product Bulletin
34.2:L2
September 2013
L2 Controller
D103034X012
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
Snap-Acting Controller: Any desired pressure between 1.4 and 5.2 bar (20 and 50 psig) direct, and
1.4 and 2.4 bar (20 and 35 psig) reverse
Do not use supply pressure below 1.4 bar (20 psig)
Supply Pressure Medium
Air or natural gas
Input Signal
Type: Liquid level or liquid-to-liquid interface
Level Change Required for Full Change in Output
Signal in a 1.0 Specific Gravity Liquid, with 1.4 bar (20 psig) Supply Pressure, Direct Action, and Standard
1-7/8 X 12-Inch (48 x 305 mm) Vertical Displacer with
Standard Lever Arm Length:
Steady-State Air Consumption
Throttling Controller: ≤0.03 normal m 3 /hr (1.0 scfh) at 1.4 bar (20 psig) supply pressure
Snap-Acting Controller: ≤0.03 normal m 3 /hr
(1.0 scfh) at 1.4 bar (20 psig) supply pressure or
≤0.04 normal m 3 /hr (1.5 scfh) at 2.4 bar (35 psig) supply pressure in tripped condition; air consumption increases during trip
Control Mode
Throttling
On-off
Snap-acting
Minimum Span Level
Change, mm (Inches)
102 (4)
127 (5)
13 (0.5)
Maximum Span Level
Change, mm (Inches)
305 (12)
305 (12)
20 (0.8)
Sensor to Vessel Connection
J 2 NPT threaded or J NPS 2 CL150 through 1500 slip-on flange connection
Minimum Specific Gravity
Throttling Controller: Minimum specific gravity, or specific gravity differential for interface applications, is 0.1
.
Snap-Acting Controller: Minimum specific gravity, or specific gravity differential for interface applications, is 0.1
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 cm 3 (1-7/8 x 12 inches, 33 in 3 )
Output Signal
Pneumatic J on-off or J proportional pressure signal
Ranges:
Throttling: J 0.2 to 1.0 bar (3 to 15 psig) or J 0.4 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 Controller:
Throttling: 1.4 bar (20 psig) for 0.2 to 1.0 bar (3 to 15 psig) output signal and 2.4 bar (35 psig) for 0.4 to 2.0
bar (6 to 30 psig) output signal
On-Off: Any desired pressure between 1.4 and 3.4 bar
(20 and 50 psig)
Maximum Displacer Insertion Length
Standard lever arm length plus one 6-inch extension, horizontal or vertical
-continued-
Displacer Material and Maximum Sensor Working
Pressure
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
2
L2 Controller
D103034X012
Product Bulletin
34.2:L2
September 2013
Specifications (continued)
Displacer Material and Sensor Temperature
Limits
PVC Displacer: -29 to 79 _C (-20 to 175_F)
S31603 SST Displacer: -40 to 204 _C (-40 to 400_F)
Sensor:
Sensor Body: LCC
O-Rings: F luorocarbon
Pivot Assembly: Stainless steel
Displacer: J Polyvinylchloride (PVC) or J S31603 SST
Sensor Spring: Stainless steel
Operative Ambient Temperature Limits
Controller: -29 to 71 _C (-20 to 160_F)
Dimensions
Hazardous Area Classification
Complies with the requirements of ATEX Group II
Category 2 Gas and Dust
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
Construction Materials
Controller:
Case and Cover: Marine grade aluminum
Relay Body: Thermoplastic
Relay Trim: Stainless steel, nitrile
Span Levers: Stainless steel
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 ANSI/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.
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. Natural gas should contain no more than 20 ppm of H
2
S.
5. Normal m 3 /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. See figure 1.
8. The pressure and temperature limits in this document and any applicable code limitations should not be exceeded.
3
Product Bulletin
34.2:L2
September 2013
Figure 1. Dimensions
2
302
(11.88)
1 2
589
(23.19)
335
(13.19)
1
287
(11.31)
2
48
(1.88)
2 318
(12.50) 302
(11.88)
2
194
(7.62)
LEVER ARM
NPT OR SLIP-ON
105
(4.12)
1/4 -18 NPT
SUPPLY CONNECTION
248
(9.75)
48
(1.88)
L2 Controller
D103034X012
191
(7.50)
155
(6.12) mm
(INCH)
Notes:
1 Dimensions include one standard 152 mm (6-inch) extension. Contact your
Emerson Process Management sales office for optional extension lengths.
2 Dimensions valid with standard displacers only.
GE08174-A
Neither Emerson, Emerson Process Management, 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.
Fisher is a mark owned by one of the companies in the Emerson Process Management business unit of Emerson Electric Co. Emerson Process Management,
Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.
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.
Emerson Process Management
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Chatham, Kent ME4 4QZ UK
Dubai, United Arab Emirates
Singapore 128461 Singapore www.Fisher.com
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