Murphy L971 Series プリント

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Durable Low Level Switch

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Replaces Non-Explosion-proof Switch on
Ingersoll-Rand Compressors

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Adaptable to Other Compressors

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Installs with Minimal Downtime

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Two Year Limited Warranty

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 (see
Specifications).

-15 to 275°F (-26 to 135°C).

30 psi (206 kPa) [2.06 bar].

Switch Rating: 4 A @ 250 VAC.
Material

Case: Aluminum (explosion-proof).
Mounting Adaptor: Brass.
Floats: Rigid polyurethane. 304 stainless 

Other Wetted Parts: 303, 304, and 

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 mm

2

).

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).

A limited warranty on materials and workmanship
is given with this FW Murphy product. A copy of
the warranty may be viewed or printed by going to
www.fwmurphy.com/support/warranty.htm.

Green

Red

Yellow

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Black

Yellow

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Shown in “shelf” position with no force acting upon float.

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Products covered by this bulletin comply with EMC

Council directive 89/336/EEC regarding electromagnetic

compatibility except as noted. 

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L-7229B

Revised 02-97

Catalog Section 15

(00-02-0059)