- Resources & Support
- Where to Buy
The Murphy L971 Series Level Switch 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 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 explosionproof enclosure, durable SPDT snap-switch and rigid polyurethane foam float. A 304 stainless steel float is available on certain configurations.
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. 304 stainless steel available on L971-C only.
Other Wetted Parts: 303, 304, and 316 stainless steel.
O-Ring Seals: Viton and Buna.
Process Connection: 1/2 NPT.
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).
For more information about this product, you can download the related literature here: