Murphy LM2000 Level Switch


Murphy LM2000 model maintains the crankcase oil level of an engine, pump or compressor. Adjusted to the correct running-oil-level, the LM2000 will replenish oil as it is used. An integral, low-level switch will alarm and/or shutdown the equipment if supply oil is lost and the equipment continues to use oil.

  • Technical Data

Murphy SKU:sc-5422 Category: Tags: , Brand:

Out of stock


As crankcase oil level drops, the LM2000 float also drops and opens the Thumb-Valve™. This allows oil to flow from the supply tank, through the LM2000, and into the crankcase. When proper level is attained in the crankcase, the LM2000 float rises, causing the Thumb-Valve™ to close off further oil flow. The simple and unique Thumb-Valve™ is nonclogging and provides a positive, leak-free seal.

  • Thumb-Valve Operation:
  • If the clean oil supply is depleted and oil level continues to fall, the low level switch will operate an alarm or equipment shutdown.
  • Features:
  • Eliminates under/overfill due to “human error”
  • See oil level and condition without shutting down
  • Simple installation
  • Automatically maintains lube level
  • Low level, 3-wire, snap-action switch
  • Positive sealing Thumb-Valve™
  • Not intended for use with fuel

Additional information

Weight2 kg

Crankcase Balance Vent Connection: 1/2 NPTF (top). Inlet Connection: 1/2 NPTF removable screen (side). Outlet Connection: LM2000 3/4 NPTF (bottom) LM2000S 2 x 3/8 NPTF (side) 1 x 3/4 NPTF (bottom) Thumb-Valve™ Material: Viton. Snap-switch: SPDT rating 10 A, 125 VAC; 0.5 A, 125 VDC; 10 A, 30 VDC. Wire leads: 18 AWG x 14 in. ± 2 in. (355 mm) length. Conduit Connection: 1/2 inch conduit (female, top). Case: Die cast aluminum Lens: Clear “Frog Eye” non-staining, high impact, high temperature polycarbonate; UV and heat stabilized. Dial: High visibility white background with green and white “index” lines for normal level indication. Maximum Inlet Pressure: 9.50 psi/25 ft. oil (head pressure). Maximum Case Pressure: 15 psi (103 kPa). Maximum Differential: 2 in. (51 mm) between running and stopped. Maximum Ambient Temperature: 250°F (121°C). Float: Brass Flow Rates: SAE 40 motor oil @ 32°F (0°C) with 2 ft. head pressure: 0.5 GPH Dimensions: Overall 4-5/8 inch tall x 2-7/8 inch deep. For exact dimensions, refer to document “00-02-0423 LM2000 Installation Instructions”. LM2000/LM2000S Shipping Dimensions: 9 x 5-1/2 x 6 in. (229 x 140 x 152 mm).



Possible replacements and related products