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Murphy Crankcase Level Switch L971

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Murphy Crankcase Level Switch with Rigid Polyurethane Float - L971

Product Condition: NEW
Murphy Crankcase Level Switch with Rigid Polyurethane Float L971
Estimated ship date: for orders by 3pm PT/6pm ET today Available for back order.

SSL Cerficate

The Murphy Crankcase Level Switch with Rigid Polyurethane Float L971 detects low oil level in a compressor’s crankcase. As oil level in the crankcase depletes, the float on the L971 switch falls, and if reaches the predetermined limit, will trip the internal snap-switch which in turn will initiate a shutdown and/or alarm. The L971 may also be used to detect rising fluid levels in stuffing box containment vessel.

The L971 is designed for Ingersoll-Rand Type 30, Type 40 and ESH compressors, yet can be adapted to fit other compressors that have an inspection plate extending below normal operating oil level. The L971 has a 1/2 NPT process connection and features an explosion-proof enclosure, durable SPDT snap-switch and rigid polyurethane foam float.



  • Explosion-Proof Enclosure
  • Rigid Polyurethane Foam Float
  • Durable Low Level Switch
  • Replaces Non-Explosion-proof Switch on Ingersoll-Rand Compressors
  • Adaptable to Other Compressors
  • Installs with Minimal Downtime



  • Part No.: L971
  • Dimensions in inches ( SEE IMAGE #2): A. 2-5/8 (67) B. 5-7/8 (149) C. 30 (762) D. 2-1/2 (64) E. 2-27/32 (72)
  • Operating Temperature Range: -15 to 275°F (-26 to 135°C)
  • Maximum Working Pressure: 30 psi (206 kPa) [2.06 bar]
  • Switch Rating: 4 A @ 250 VAC
  • Case: Aluminum (explosion-proof)
  • Mounting Adaptor: Brass
  • Floats: Rigid polyurethane
  • Other Wetted Parts: 303, 304, and 316 stainless steel
  • O-Ring Seals: Viton and Buna
  • Enclosure Rating: UL and CSA listed for Class I, Groups C & D; Class II, Groups F & G, Hazardous Locations
  • Conduit Connection: 1/2 NPT
  • Wire: 18 AWG (0.75 mm2)
  • Shipping Weight: 1 lb. 10 oz. (0.7 kg)
  • Shipping Dimensions: 8-1/4 x 4-1/4 x 4-1/2 in. (210 x 108 x 114 mm)

NOTES: Switch shown tripped on falling level (image #4)

Additional Information

Product Condition NEW
upc No

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