FW Murphy MLS Liquid Level Switch

Simplify preventive maintenance

Murphy MLS Liquid Level Switch

This single-seal magnetic level switch features an impenetrable barrier between the process side and the electrical/switch side.

  • No seals reduce fugitive emission leaks
  • Terminal block wiring eliminates need for junction boxes
  • Optional test feature provides easy preventive maintenance testing

FW Murphy MLS Series Liquid Level Switches are float activated to operate an electrical SPDT reed switch to signal dangerous high levels to an annunciator, controller or PLC. The MLS connects directly into the gas scrubber wall with a FW Murphy weld collar or FW Murphy external float chamber. 

Available in both 1 ½-inch and 2-inch NPT models.


  • Clean magnet design virtually eliminates iron filing accumulation on the magnet
  • Seal-free construction
  • ANSI/ISA 12.27.01 compliant (Single Seal)
  • Optional push button to test functions 
  • Operates in 0.50 specific gravity or heavier fluids
  • Designed for harsh gas compressor scrubber applications
  • 304 cast equivalent SS body and 304 SS float
  • Rated for 2000 psi (13.8 MPa) [138 bar] working pressure
  • Trip on rising and falling without need to rotate body
  • Electric model only available
  • All models screw directly into the scrubber or can be mounted via a FW Murphy External Float Chamber
  • CSA C/US Class I, Div. 1, Grp. B, C & D locations
  • Canadian registered, CSA approved

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