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MLS Liquid Level Switch

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.

FW Murphy MLS Liquid Level Switch


Process Connection:
2” NPT (MLS-020); 1-1/2” NPT (MLS-015)
Fluid Density (SG):
0.50 MIN (no extension)
0.65 MIN (1 inch extension)
Pressure Rating:
2000 psig (13.8 MPa) [138 bar]
ASTM A351 CF8 (304 SS)
ASTM A351 CF8 (304 SS


  • 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