Murphy Crankcase Level Switch with Rigid Polyurethane Float - L971

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.

PRODUCT FEATURES:

• 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

PRODUCT SPECIFICATIONS:

• Murphy 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)