Lube Level Maintainer
Lube Level Maintainer



  • ATEX Certified, Zone 2, Category 3G
  • Ex ic IIC T5 Gc X -20°C < Ta < 85°C
  • Environmental Sealing: IP54
  • Test Feature (TF) allows test of float and switch
  • Direct Mount (DM) capable
  • 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-ValveTM


The Murphy LM500-TF-ATEX Oil Level Maintainer includes a test feature that confirms both the float and switch are operating correctly with a single press of the test button. The LM500 series maintains the crankcase oil level of an engine, pump or compressor. Adjusted to the correct running-oil-level, it will replenish oil as it is used. The low-level switch will alarm and/or shutdown the equipment if supply oil is lost and the equipment continues to use oil.





The LM500-TF-ATEX maintains oil level on any size engine. It also supports installations that require a 3-wire, snap-action switch. Refer to LM500 Series Flow Rate Chart for application data.


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