Description
Murphy LM2000 model 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 inte-
gral, low-level switch will alarm and/or shutdown
the equipment if supply oil is lost and the equip-
ment continues to use oil.
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.
How the LM2000
Maintains Levels
As crankcase oil level drops, the LM2000 float
also drops and opens the Thumb-Valve
TM
. 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
TM
to close off fur-
ther oil flow.
The simple and unique Thumb-Valve
TM
is non-
clogging and provides a positive, leak-free seal.
Flow rate through the 1/8 in. (3 mm) orifice is suffi-
cient to allow crankcase refill through the LM2000.
Specifications
Crankcase Balance Vent Connection:
1/2 NPTF (top).
Inlet Connection:
1/2 NPTF removable screen (side).
Outlet Connection:
LM2000 3/4 NPTF (bottom)
LM2000S 2 x 3/8 NPTF (side)
1 x 3/4 NPTF (bottom)
Thumb-Valve
TM
Material:
Viton.
Snap-switch:
SPDT rating 10 A, 125 VAC; 0.5 A,
125 VDC; 10 A, 30 VDC.
Wire leads:
18 AWG x 24 in.(609 mm) length.
Conduit Connection:
1/2 inch conduit (female, top).
Case:
Die cast aluminum
Lens:
Clear “Frog Eye” non-staining, high impact,
high temperature nylon; UV and heat stabilized.
Dial:
High visibility white background with green and
white “index” lines for normal level indication.
Maximum Inlet Pressure:
9.50 psi/25 ft. oil
(head pressure).
Maximum Case Pressure:
15 psi (103 kPa).
Maximum Differential:
2 in. (51 mm) between
running and stopped.
Maximum Ambient Temperature:
250°F (121°C).
Float:
Brass
Flow Rates:
SAE 40 motor oil @ 32°F (0°C) with
2 ft. head pressure: 0.5 GPH (1.9 LPH)
(1/8” orifice).
NOTE:
Friction losses due to piping not considered.
Optional Vent Fitting Kit: 15000954
Kit sold separately–includes the following items:
Quantity Description
1
Tubing vent (15050202).
1
1/4 x 1/2 NPT Connector (85030447).
Optional Hose Kit: 15000355
Quantity Description
1
1/2 in. (13 mm) I.D. x 3 ft. (914 mm)
long hose (89020202)
1
1 in. (25 mm) I.D. x 3 ft. (914 mm)
long hose (89020203)
2 1/2
in.
(13 mm) worm gear clamp
(00003502)
2 1
in.
(25 mm) worm gear clamp
(00003503)
2
1/2 NPT x 1/2 in. (13 mm) barbed fitting
(89080801)
2
3/4 NPT x 1 in. (25 mm) barbed fitting
(89081001)
Thumb-Valve Operation
As the equipment uses oil, the float falls, provi-
ding immediate level compensation. At FULL
position, the float holds the valve closed. If the
clean oil supply is depleted and oil level
continues to fall, the low level switch will
operate an alarm or equipment shutdown.
LM-00010B page 1 of 2
Model LM2000/LM2000S
■
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*
Not intended for use with fuel
COM.
(white)
N.O. (black)
Low Level Switch
LM2000
Case
Float
Action
Oil Inlet
Thumb-Valve™
FULL
LOW
N.C. (red)
Thumb-Valve
TM
Operation (Simplified)
*
Contact the factory for detailed information.
See back page for telephone and fax.
LM-00010B
Revised 10-03
Catalog Section 15
(00-02-0422)
Lube Level Maintainer
