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Murphy L971 Series Level Switch
L971 – An explosion-proof crankcase level switch


MURPHY墨菲L971系列液位开关检测压缩机曲轴箱中的低油位。当曲轴箱中的机油油位耗尽时,L971开关上的浮子下降,当达到预定限值时,它将触发内部按动开关发出警报或启动关机。L971是为英格索兰30型、40型和ESH型压缩机而设计的,但它也可以适用于其它带有检查板的压缩机,检查板延伸到正常工作油位以下。它以最少的停机时间安装,并有两年的有限保修期。L971采用1/2 NPT工艺连接,并配有防爆外壳、耐用的SPDT速动开关和硬质聚氨酯泡沫浮子。在某些配置上提供304不锈钢浮子。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 when reaching the predetermined limit, it will trip the internal snap-switch sounding an alarm or initiating shutdown. The L971 is designed for Ingersoll-Rand Type 30, Type 40 and ESH compressors, yet it can be adapted to fit other compressors that have an inspection plate extending below normal operating oil level. It installs with minimal downtime and has a two-year limited warranty. The L971 has a 1/2 NPT process connection and features an explosion-proof enclosure, durable SPDT snap-switch and rigid polyurethane foam float. A 304 stainless steel float is available on certain configurations.

 

Murphy L971 Series Level Switch
L971 – An explosion-proof crankcase level switch

Features:

  • Durable Low Level Switch
  • Replaces Non-Explosion-proof Switch on Ingersoll-Rand Compressors
  • Adaptable to Other Compressors
  • Installs with Minimal Downtime
  • Two Year Limited Warranty

 

  • 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
  • Hazardous Location Rating: UL and CSA listed for Class I, Groups C & D; Class II, Groups F & G.
  • Enclosure Type / Ingress Protection Rating: IP66 per IEC 60529.
  • 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)

 

Options are ordered by Case/Float Configurations. Please reference the Case/Float Configuration Diagram and the Dimensions for each model. All configurations may not be available. Call your sales representative or Enovation Controls for more information.

  • L971 - A
    • Blank = Standard Configuration
    • A = Configuration A
    • B = Configuration B
    • C = Configuration C
    • D = Configuration D
    • E = Configuration E
    • F = Configuration F
    • G = Configuration G
  • 15000449 - Float Kit for L971

Dimensions

Dimensions are inches (millimeters).

 

Model A B C D E
Model
A
B
C
D
E
L971
2-5/8 (67)
5-7/8 (149)
30 (762)
2-1/2 (64)
2-27/32 (72)
L971-A
2-5/8 (67)
5-7/8 (149)
30 (762)
2-1/2 (64)
2-27/32 (72)
L971-B
4-13/16 (122)
8-1/16 (205)
30 (762)
4-5/8 (117)
2-27/32 (72)
L971-C
2-13/16 (71)
6-1/16 (154)
30 (762)
2-7/8 (73)
3-1/8 (79)
L971-D
3-7/8 (98)
7-1/8 (181)
30 (762)
3-3/4 (95)
2-27/32 (72)
L971-E
4-13/16 (122)
8-1/16 (205)
30 (762)
5-1/8 (130)
2-27/32 (72)
L971-F
2-5/8 (67)
5-7/8 (149)
49 (1016)
2-1/2 (64)
2-27/32 (72)
L971-G
2-5/8 (67)
5-7/8 (149)
40 (1016)
2-1/2 (64)
2-27/32 (72)

 

 

For more information about this product, you can download the related literature here:

 



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