Installation of Lube Level Maintainer
Models LM500 / LM500-TF
Please read the following instructions and warnings before installation. Visually inspect the product for any damage that
may have occurred during shipping.
Before installation of this product:
•
It is your responsibility to ensure that qualified mechanical and
electrical technicians install this product.
•
Disconnect all electrical power to the machine.
WARNINGS
•
Make sure the machine cannot operate during installation.
•
Follow all safety warnings of the machine manufacturer.
•
Read and follow all installation instructions.
•
Please contact FW Murphy Production Controls immediately if
you have any questions.
The FW Murphy LM500 model maintains the crankcase oil level of an engine,
pump or compressor. Adjusted to the correct running oil level, the LM500 will
replenish oil as it is used. The low level switch will alarm and/or shut down the
equipment if the supply oil is lost and the equipment continues to use oil. The
LM500-TF model includes a test feature that confirms both the float and switch are
operating correctly with a single press of the test button.
Range of the Snap-Switch
This illustration shows the LM500 dial and the operating range of the switch. If level is within the designated zones, the switch
will activate.
The switch activates approximately 1/4 in. (6 mm) from the bottom of the low zone. If the level continues to drop into the low-
low zone, a shutdown will occur.
Test Feature
The form C (3-wire) contact allows a
controller/annunciator to be wired as a
closed loop system, resulting in a reliable
fault-sensitive circuit.
NOTE: Holding test button for a prolonged
period of time could cause crank case to
overfill.
LM500 Series Flow Rates
LM500 Series Flow Rates
4.000
3.500
3.000
2.500
2.000
1.500
1.000
0.500
0.000
0
10
20
30
40
1
sect. 15
NOTE: Color zones on dial
face show approximate normal
operating zones. Actual
conditions may vary depending
upon operating characteristics
of the engine. Placement of
the LM500 according to these
instructions will compensate for
these conditions.
50
60
70
80
90
100
110
Temperature ( ˚F )
00-02-0729
rev. 2022/06/30
The LM500
Series Flow
Rates are
based on SAE
40 motor oil
@2 ft. head
pressure.
Friction
losses due to
piping are not
120
130
considered.
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