FW Murphy Fluid Level Gages

An engine must have proper fluids levels to run efficiently. Murphy provides a wide variety of instrumentation that has long been the industry standard for maintaining fluid levels on engines, pumps and compressors. From liquid level gages that have an adjustable high/low Swichgage®, to scrubbers, dump valves and bilge level systems - you're sure to find the instrumentation that you need to protect your investment. We offer several repair kits and other accessories to help you properly mount and maintain your gages. FW Murphy builds other models that are not shown here. Please contact RJ Mann & Associates, Inc. inside sales to see which models are currently available.

 

L150, EL150K1 Series Level Swichgage® Instruments for Engine Liquids

murphy.EL150K1The 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

• Float Operated
• Indicating Gauge
• Low Limit Switch
• Monitors Level of Coolant, Lube Oil, Diesel Fuel And Hydraulic Fluid
• Explosion-Proof Model Is Available

Applications

The primary use of the L150/EL150K1 is for engine cooling systems, surge or expansion tanks, condenser radiator or vapor phase systems, pressurized or atmospheric systems. The Level Swichgage instrument can also be used to monitor lube oil, hydraulic fluid or diesel fuel reservoirs and activates alarms and/or shut-down at a predetermined minimum level. These instruments are built for low pressure systems with a maximum of 25 psi (172 kPa) [1.72 bar].

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)
• Installation Instructions for EL150EX Switch/Terminal Kit (pdf)

LM300 Series Level Maintainer

murphy.LM301The LM300 Series Level Maintainer automatically adds oil to the crankcase as needed to keep the lube level normal. Most models have built switches that will alarm and/or shutdown the equipment if the makeup supply is depleted and engine oil level falls, or if overfill conditions exist. Murphy's LM300 series explosion-proof models are CS certified for Class I, Division 1 Hazardous areas.

Features

• Maintains proper lube level
• Shutdown on low level, or high and low level
• Low level alarm before shutdown
• Manual float switch test
• High visibility “Frog Eye” lens
• Optional pipe or universal mounting brackets
• Optional inlet orifices for low to high pressure applications
• Explosion-proof models available

Applications

Engines, Pumps, Compressors, Coolers.

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)

LM500, LM500-TF Series Lube Level Maintainer

murphy.LM500The LM500 Series maintains the crankcase oil level of an engine, pump or compressor. Adjusted to the correct running-oil-level, it will replenish oil as it is used. The low-level switch will alarm and/or shutdown the equipment if supply oil is lost and the equipment continues to use oil. Murphy's LM500-TL Oil Level Maintainer includes a test feature that confirms both the float and switch are operating correctly with a single press of the test button.

The LM500 works as follows: As crankcase oil level drops, the LM500 float drops and opens the Thumb-Valve™. This allows oil to flow from the supply tank, through the LM500, and into the crankcase. When proper level is achieved in the crankcase, the LM500 float rises, causing the Thumb-Valve™ to close off further oil flow. The simple and unique Thumb-Valve™ is non-clogging and provides a positive, leak-free seal.

Features

• Test Feature (TF Model) allows test of float and switch
• Direct Mount (DM) capable
• Eliminates under/overfill due to "human error"
• See oil level and condition without shutting down
• Simple installation
• Automatically maintains lube level
• Low level, 3-wire, snap-action switch
• Positive sealing Thumb-Valve™
• Not intended for use with fuel

Application

The LM500 maintains oil level on any size engine. It also supports installations that require a 3-wire, snap-action switch. Refer to LM500 Series Flow Rate Chart for application data.

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)

LM2000, LM2000S Lube Level Maintainer

murphy.LM2000Murphy's LM2000 maintains the crankcase oil level of an engine, pump or compressor. Adjusted to the correct running-oil-level, the LM2000 will replenish oil as it is used. An integral, low-level switch will alarm and/or shutdown the equipment if supply oil is lost and the equipment continues to use oil.

The LM2000 works as follows: As crankcase oil level drops, the LM2000 float also drops and opens the Thumb-Valve™. This allows oil to flow from the supply tank, through the LM2000, and into the crankcase. When proper level is attained in the crankcase, the LM2000 float rises, causing the Thumb-Valve™ to close off further oil flow.

The simple and unique Thumb-Valve™ is non-clogging and provides a positive, leak-free seal. Flow rate through the 1/8 in. (3 mm) orifice is sufficient to allow crankcase refill through the LM2000.

Features

• Eliminates under/overfill due to “human error”
• See oil level and condition without shutting down
• Simple installation
• Automatically maintains lube level
• Low level switch
• Positive sealing Thumb-Valve™
• Heating loop and special mounting capabilities

Application

The LM2000 maintains oil level on any size engine, but is recommended for small to medium volume applications and installations that require a 3-wire, snap-action switch.

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)

LR500 Series Oil Level Regulators for Lubricators

murphy.LR579The LR500 Series Level Regulators automatically add oil to a lubricator to maintain the factory recommended level. This function eliminates the work time necessary for manual checks and refills.

Each model has a low-level shutdown switch to protect equipment when oil supply is lost. If the lubricator oil level drops below the minimum operations level, the low-level switch will operate an alarm and/or shutdown the equipment.

Model LR579  is for Lincoln lubricators. It features an adjustable low-level shutdown contact.

Model LR589 is also for Lincoln lubricators. The LR589NC is the normally closed wired version of the LR589.

Features

• Unique anti-clog thumb-valve
• Regulates oil flow from reservoir to keep lubricator full
• Eliminates manual oil check and refill time
• Low-level shutdown switch
• Reduce engine and pump repairs caused by low lube level

Literature

• Sales Bulletin/Installation Instructions (pdf)

LR857 Lube Level Regulator / Maintainer

murphy.LR857Murphy's LR857 Lube Level Regulator maintains the crankcase oil level of an engine, pump or compressor. Adjusted to the correct running-oil-level, the LR857 will replenish oil as it is used. An integral, low-level switch will alarm and/or shutdown the equipment if supply oil is lost and the equipment continues to use oil.

The LR857 works as follows: As crankcase oil level drops, the LR857 float also drops and opens the Thumb-Valve™. This allows oil to flow from the supply tank, through the LR857, and into the crankcase. When proper level is attained in the crankcase, the LR857 float rises, causing the Thumb-Valve™ to close off further oil flow. The simple and unique Thumb-Valve™ is non-clogging and provides a positive, leak-free seal. Flow rate through the 1/8 inch (3 mm) orifice is significant to allow crankcase refill through the LR857.

Features

• Eliminates under/overfill due to “human error”
• Simple installation
• Automatically maintains lube level
• Low level switch
• Models to fit varied applications
• Positive sealing Thumb-Valve™

Application

The LR857 maintains oil level on any size engine, but is recommended for small to medium volume applications and installations that require a 3-wire, snap-action switch.

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)

L100 Series Float Actuated Oil Level Swichgage® Instruments

murphy.L100The L100, L120, L127 and L128 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

Application

The level instruments described above can be used on a variety of crankcases, pump gearcases, or oil reservoirs – primarily on small engines and pumps. The following list displays the model and its typical application: 

L100: Small engines and pumps with non-vented crankcase.
L100W: Small engines and pumps with vented crankcase.
L120: Machined surface on crankcase such as Witte, National-Oilwell/Garland.
L127: Machined surface on crankcase, specifically, Fairbanks-Morse ZC Series and Bell Engines.
L128: Machined surface on crankcase, specifically, Arrow and Continental Emsco/Climax.

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)

L129 Series Lube Level Swichgage® Instrument

murphy.L129The 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.

A 6-3/4 inch (171 mm) deep sight gauge allows you check the condition and level of your oil without shutting down the equipment.

Fingertip adjustable limit contacts, thru 4-7/8 inch (122 mm) range, make it simple to set high and low limit contacts. If the float touches the high or low limit contact, a normally open circuit will be completed which can activate alarms and/or shutdown the equipment.

There are two models in the L129 Series: L129 and L129CK1. The L129 model is designed for grounded, low voltage electrical systems. It features a one-wire-to-ground electrical circuit. The L129CK1 was designed for applications requiring a three-wire, above ground electrical circuit. It features ungrounded contacts and a conduit hub to protect electrical wiring.

Options are available for both models. A flow restrictor plug is available that restricts oil flow from the crankcase to the L129 Series switch and vice versa. It is typically used on applications where the engine is not stationary such as marine and mobile equipment.

The L129 Series Lube Level Swichgage, when properly installed and maintained, can monitor and protect your engines and pumps from improper lubrication level, which can result in extensive damage.

Features

• Check lube level without shutting down
• Use on engines, pumps, and compressors
• Combination indicating gage with low and high limit switch
• Float operated

Application

The L129 Series is recommended for engines and pumps with larger crankcase capacity. Although designed primarily for stationary engines, the L129 Series is often used in mobile applications such as marine, rail, and some large off-highway trucks.

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)

L971 Series Crankcase Level Switch

murphy.L971The 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. When it reaches the predetermined limit, the internal snap-switch will trip, 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 explosion-proof enclosure, durable SPDT snap-switch and rigid polyurethane foam float. A 304 stainless steel float is available on certain configurations.

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

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)

MLS Series Liquid Level Switches

murphy.MLS-020MLS-015 and MLS-020 Series Liquid Level Switches are float activated to operate an electrical SPDT reed switch for annunciation/pilot signal for indication of high level to an annunciator, controller or PLC. The MLS connects directly into the gas scrubber wall and can be used with a Murphy weld collar or Murphy external float chamber. The MLS Series is available in both 2”NPT and 1- 1/2” NPT models.



Features

• Clean magnet design virtually eliminates iron filing accumulation onto the magnet
• Seal-Free construction
• ANSI/ISA 12.27.01 compliant (Single Seal)
• Operates in 0.50 specific gravity or heavier fluids
• Designed for harsh gas compressor scrubber applications
• 304 cast equivalent stainless steel body and 304 stainless steel float
• Rated for 2000 psi (13.8 MPa) [138 bar] working pressure
• Trip on rising and falling without need to rotate body
• Electric model only available
• All models screw directly into the scrubber or can be mounted via a Murphy external float chamber
• CSA C/US Class I, Div. 1, Grp. B, C & D locations
• NACE MR0175 compliant
• Canadian Registration Number

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)

LS200, L1100 Series Liquid Level Switches

murphy.LS200LS200: Liquid Level Switches with 2” NPT mounting are float activated to operate an electrical SPDT snap switch (optional DPDT on some models) for alarm or shutdown of an engine or electric motor. The LS200 connects directly into the scrubber wall and can be used with a Murphy weld collar (P/N 15050375) or Murphy external float chamber (P/N 15700799).  L1100 models (1-1/2” NPT) are also available.

 LS200NDVOR: A float-activated, pneumatic-vent level device used to operate dump valves or similar devices.

LS200NDVOR: Provides a 2” NPT mounting with a pneumatic output for interfacing with pneumatic devices such as our Murphy pneumatic dump valve or with other pneumatic instrumentation.

 LS200NDVO: A Dump Valve Operator (DVO) without the pressure regulator for those applications where the system provides a filter regulator for “instrument quality” air or gas as the control medium.

 LS200N: A pneumatic level switch without the DVO and filter regulator.

NOTE:  Pneumatic media devices require clean, dry, instrument quality air or gas. This unit is supplied with a pressure regulator, filter and Murphy 20BPG pressure gage for improved system life and trouble-free operation.

Features

• Designed for harsh gas compressor scrubber applications
• 304 stainless steel float operates in 0.55 specific gravity and heavier fluids
• LS200 series rated for 2000 psi (13.8 MPa) [138 bar] working pressure
• Electric and pneumatic models available
• More robust design
• All models screw directly into the scrubber or can be mounted via external float chamber
• Nickel plated body to provide enhanced corrosion protection
• Listed for Class I, Div. 1, Grp. C & D locations
• Canadian Registration Number 0F01476.2
• Stainless Steel models are available for corrosive atmospheres
• Trip on rising liquid level only

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)
• Scrubber Level System - Sales Bulletin (pdf)

DVU Series Dump Valves

murphy.DVU150The DVU Series are pneumatically controlled dump valves. The valves open and close automatically by pneumatic control from a Murphy L1200NDVOR or similar level controller and dump valve operator. Diaphragm actuated, the DVU Series dump valves operate at 30-70 psi (207-483 kPa) [2.07-4.83 bar] and up to 2000 psi (13.8 MPa)[138 bar] vessel pressure (depending on the model). A key benefit of this design is a hex union that provides the ability to replace the seat without removing the valve from piping.

Features

• For separators/scrubbers to 2000 psi (13.8 MPa)[138 bar] working pressure
• Hex union allows plug and seat replacement without piping removal
• Operates on 30-70 psi (207-483 kPa) [2.07-4.83 bar] control pressure
• Compatible with Murphy Level Controls
• Soft seat valve
• Manual valve operator

Applications

Designed for gas compressor scrubbers, the DVU Series can be used to dump any liquids compatible with its materials of construction.

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)

OPLH, OPLHACS Series 4-1/2" Dial Level Swichgage® Instruments

murphy.OPLHThe 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.

Basic Operation: The OPLHC/OPLHACS series operate from static head pressure. Pressure is transmitted to the process connection of the Swichgage instrument. From here the pressure flexes the bourdon tube or operates the 316 stainless steel bellows (depending on which model you have). The bourdon tube/bellows operates the stainless steel rotary geared movement which in turn operates the indicating pointer on the face of the dial. When the pointer closes with the limit contact, a control circuit is completed and signals an alarm and/or shutdown or starts/stops a pump.

Features

• Eliminates under/overfill due to “human error”
• 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® Instruments available
• Latching control relay versions available

Applications

Saltwater Disposal Systems, Waterflood Systems, Diesel Day Tanks, Oil Storage Tanks

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)

Bilge Level Switch System: BLSK1 Series

murphy. BLSK1The BLSK1 Bilge Level Switch System gives you all items and fittings necessary to install in your bilge. Or, you can have only the parts you want and you provide brackets, tubing and mounting hardware. Using the proven “Air Cell” actuating system, all moving parts and switching are remote from bilge liquids and are thus not affected by corrosion, rust, etc. All wetted parts are of non-corrosive materials.

As bilge level rises a column of air is captured in the MAC1 Air Volume Cell. The rising bilge level compresses the column of air creating pressure against the large diaphragm in the BLS1 Bilge Level Switch and the switch trips. Switch set point is adjustable. The switch resets as the bilge is pumped out. Air cell recharges itself during normal operation.

The BLS1 is constructed of materials not affected by marine atmospheres: Aluminum or Bronze body and cover, Buna-N diaphragm.

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:
        - BLS1 bilge level switch
        - MACT1 tube kit (sensor line and fittings)
        - MAC1 “air cell” (volume cell)

Literature

• Sales Bulletin/Installation Instructions (pdf)

Hydrostatic Head Level Switches: DF Series

murphy.DF755The 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.

The nitrile sensing diaphragm is impervious to most liquids and is sensitive enough to control levels with 1/4 in. (6 mm) repeatability. See model descriptions for limits of switch trip point adjustability. Materials include aluminum body, nylon bottom plate and a special alloy leaf snap-switch as standard. This simple level switch is highly reliable and can be worked into almost any new or existing system without major modification or special tools. 

DF755 and DF757 are suitable for atmospheric tanks in a non-hazardous area. The SPDT snap-switch for the DF755 is preset for a 4 in. (102 mm) differential in liquid level. The DF757 trip point is adjustable over a 108 in. (2743 mm) differential.

DF755EX is the same as the DF755 except CSA listed for Class I, Division 1, Groups C and D hazardous areas.

Applications

Water Flood Systems, Crude Oil Tanks, Salt Water Disposal Systems, Diesel Day Tanks, Sumps, Cooling Towers.

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)



 
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