MLS015 / MLS020

MLS Series Liquid Level Switches are float activated to operate an electrical SPDT reed switch for annunciation/pilot signal for indication of high level to an annunciator, controller or PLC. The MLS connects directly into the gas scrubber wall and can be used with a FW Murphy weld collar or FW Murphy external float chamber. The MLS Series is available in both 1 1/2 and 2 in. NPT models and with or without the test button.

The test button test for float function; the complete mechanism including the magnetic activation of the reed switch; and the wiring from the switch to the control panel.


  • 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