Data Sheet

www.Fisher.com
Fisher
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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.
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.
L2 Controller
D103034X012
Product Bulletin
34.2:L2
September 2013