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Parts, Service, Replacements
800-341-4334 Email UsFW Murphy Level Switches
Palmer Jonson stocks a full-line of Murphy level switches. Our massive inventory and authorized distributor status allows us to quote the most competitive price, and provides you with access to insider expertise and technical documentation.
BLSK1 Specifications
Case/Lid: Aluminum (std).
Bottom Plate: Glass-filled Nylon.
Process Connection: 1/4 NPTF.
Max. Pressure: 25 psi (172 kPa) [1.72 bar].
Conduit Connection (electrical): 1/2 NPT.
BLS1 Weight: 3 lb. (1.4 kg).
BLS1 Dimensions: 6-1/4 x 6-1/4 x 6-1/4 in. (159 x 159 x 159 mm).
BLSK1 Overview
Features
• Operates Bilge Pumps or Alarms
• Uses Proven “Air Cell” Actuated System
• Remote Switch and Moving Parts Kept Unaffected by Corrosion
• Aluminum Body and Cover
• Includes 3 Assemblies:
(1) BLS1 Bilge Level Switch
(2) MACT1 Tube Kit (Sensor Line and Fittings)
(3) MAC1 “Air Cell” (Volume Cell)
DF755 / DF757 Specifications
SPDT (standard–all models):
- 5 A @ 125, 250, or 480 VAC
- 1/2 A @ 125 VDC, 1/4 A @ 250 VDC
DPDT (optional):
- 10 A @ 28 VDC
- 10 A @ 120, 230 VAC
Case/Lid: Aluminum (standard).
Bottom Plate: Glass-filled Nylon.
Process Connection: 1 NPT (standard).
Maximum Pressure Rating: 25 psi (172 kPa [1.72 Bar]).
Conduit Connection (electrical): 1/2 NPT.
DF755 / DF757 Overview
The DF series are diaphragm operated “hydrostatic head pressure” level switches. A pressure sensitive diaphragm operates a snap-switch that can be wired directly to electric pilot circuits to control pumps at predetermined levels. Typical application is to start and stop electric driven pump(s) to maintain tank levels. It is also applicable to engine driven pumps.
This simple level switch is highly reliable and can be worked into almost any new or existing system without major
modification or special tools.
L100 / L120 / L127 / L128 Specifications
Maximum Pressure Rating (all models): 30 psi (207 kPa) [2.07 bar]
L100 / L120 / L127 / L128 Overview
These float actuated Oil Level Swichgage instruments are a combination oil level sight gage and adjustable, low and/or high limit switch. The limit switches are normally open during operation– yet close if the level drops (or rises) to where the float contacts the limit screw. The contact completes a circuit to ground a magneto or trip a Murphy magnetic switch. The magnetic switch can be used to activate alarms and/or shutdown. Models are also available without limit switches.
Features
• See Oil Level and Condition Without Shutting Down
• Shutdown or Alarm on Low Lube Level
• Adjustable Limit Switch for Alarm and/or Shutdown
• Save on Reduced Downtime and Repair Costs
• Simple Installation
L129 Specifications
Case: Die Cast Aluminum.
Lens: Tempered Glass.
Maximum Working Pressure: 10 psi (68.9 kPa).
Process Connection: 1/2 NPT.
Float Material: Brass.
Contact Rating: 2 A @ 30 VAC/DC, pilot duty.
L129 Overview
The L129 Series Lube Level Swichgage instrument is a combination lube level indicating gage and adjustable low and high limit switches. It provides protection against low oil level or high level caused by overfill or fuel or water seepage into the crankcase.
Features
• Check Lube Level Without Shutting Down
• Use On Engines, Pumps, And Compressors
• Combination Indicating Gage with Low and High Limit Switch
• Float Operated
L150 Specifications
Case: Die cast aluminum, poly-urethane coated; approximate dimensions; 4-1/2 x 4-3/4 x 2-3/4 in. (114 x 121 x 70 mm).
Mounting Holes: (2) 9/32 in. (7 mm) diameter at 4-1/2 in. (114 mm) on center.
Float: Brass.
Lens: Polycarbonate.
O-rings: Saturated Nitrile, are suitable for coolant or hydrocarbons. Maximum temperature 250°F (121°C).
Gasket: Nitrile.
L150 Overview
The L150 Series Level Swichgage instrument is a combination liquid level gauge and low limit switch; each unit includes (1) a chamber with pivotal float, (2) an indicating dial with pointer, and (3) a low level contact. When properly installed and maintained, the float operates the pointer which, in turn, both indicates level during normal operation, and closes a switching circuit if the level falls to the low-limit set point.
Features
• Monitors Level of Coolant, Lube Oil, Diesel Fuel And Hydraulic Fluid.
• Indicating Gauge
• Low Limit Switch
• Float Operated
• Explosion-Proof Model Is Available
L971 Specifications
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.
L971 Overview
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 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.
OPLH / OPLHACS Overview
The OPLHC/OPLHACS Series Level Swichgage instruments are combination level indicating gages with adjustable low and high limit switches. Limit switches can be wired directly to electric pilot circuits to operate alarms, shutdown or start/ stop pumps to maintain predetermined levels.
Surface mount or panel mount enclosure is available for both model series. All models feature a 4-1/2 in. (114 mm) dial for easy viewing. Adjustable limit switches are accessible from front of the Swichgage instrument.
Specialized models are available for specific applications involving engines or electric motors.
Features
• Combination Level Indicating Gage and Critical Level Limit Switch
• High and Low Level Limit Contacts Are Visible and Adjustable
• Designed to Start and Stop Pumps to Maintain Specific Levels
• Indication only Murphygage® instrument Available
• Latching Control Relay Versions Available
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