Murphy LM500 User Manual

Section 15 00-02-0729
02-11-11 - 3 -
Thumb-Valve
TM
Operation
As the equipment uses oil, the float falls, providing immediate level compensation. At
FULL position, the float holds the valve closed. If the clean oil supply is depleted and oil
level contuse to fall, the low level switch will operate an alarm or equipment shutdown.
LM500 Series Flow Rates
LM500 Series Flow Rates are based on SAE 40 motor oil @2 ft. head pressure. Friction losses
due to piping are not considered.
Service Parts (Specify part number)
Description
Part Number
Vent Fittings Kit 15000954
Hose Kit 15000355
1/2 NPT x1/2in Hose Barbed Fitting 89080801
3/4NPT x 1/2in Hose Barbed Fitting 89081001
Pipe Bracket Kit 15000518
Universal Flange Kit 15000519

Murphy LM500 Specifications

Connections

Crankcase balance vent connection	1/2 NPTF (top)
Inlet connection	2 x 3/4 NPTF (side)
Conduit connection	1/2 inch conduit (female, top)

Switch Specifications

Snap-switch SPDT rating (AC)	10 A, 125 VAC
Snap-switch SPDT rating (DC)	0.5 A, 125 VDC, 10 A, 30 VDC

Pressure and Temperature

Maximum inlet pressure	9.50 psi/25 ft. oil (head pressure)
Maximum differential pressure	2 in (51mm) between running and stopped
Maximum ambient temperature	250°F (121°C)

Physical Characteristics

Wire leads length	14 in +/- 2 in (355 mm)
Case material	Die cast aluminum
Lens material	Clear “Frog Eye” non-staining, high impact, high temperature nylon