Liquid Level Switches
Liquid Level Switches


LS200 Liquid Level Switches with 2" NPT mounting are float activated to operate an electrical SPDT snap switch (optional DPDT on some models) for alarm or shutdown of an engine or electric motor. The LS200 connects directly into the vessel wall and can be used with a Murphy weld collar or Murphy external float chamber. L1100 models are also available.


LS200NDVOR is a float-activated, pneumatic-vent level device used to operate dump valves or similar devices.


The LS200NDVOR provides a 2" NPT mounting with a pneumatic output for interfacing with pneumatic devices such as our Murphy pneumatic dump valve or with other pneumatic instrumentation.


LS200NDVO is the Dump Valve Operator (DVO) without the pressure regulator for those applications where the system provides a filter regulator for "instrument quality" air or gas as the control medium.


LS200N is the pneumatic level switch without the DVO and filter regulator.



  • Designed for harsh gas compressor scrubber applications
  • 304 stainless steel float operates in 0.55 specific gravity and heavier fluids
  • LS200 series rated for 2000 psi ( 13.8 MPa ) [138 bar] working pressure
  • Electric and pneumatic models available
  • More robust design
  • All models screw directly into the vessel or can be mounted via external float chamber
  • Nickel plated body to provide enhanced corrosion protection
  • Listed for Class I, Div. 1, Grp. C & D location
  • Canadian Registration Number OF1476.2
  • Stainless Steel models are available for corrosive atmospheres
  • Trip on rising liquid level only
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