LM500 Series Level Maintainers
The LM500 maintains oil level on any size engine. It also supports installations that require a three-wire, snap-action switch. The form C (three-wire) contact allows a controller/annunciator to be wired as a closedloop system, resulting in a reliable fault-sensitive circuit. Refer to LM500 Series Flow Rate Chart for application data.
The FW Murphy LM500-TF 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.
Crankcase Balance Vent Connection: 1/2 NPTF (top).
Inlet Connection: 1/2 NPTF removable screen (side).
2 x 3/4 NPTF (side)
1 x 3/4 NPTF (bottom)
Thumb-Valve™ Material: Viton.
Snap-switch: SPDT rating 10 A, 125 VAC; 0.5 A, 125 VDC; 10 A, 30 VDC.
Wire leads: 18 AWG x 14 in. ± 2 in. (355 mm) length.
Conduit Connection: 1/2 inch conduit (female, top).
Case: Die cast aluminum
Lens: Clear “Frog Eye” non-staining, high impact, high temperature polycarbonate; UV and heat stabilized.
Dial: High visibility white background with solid green band 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: 304 Stainless Steel
Flow Rates: Refer to LM500 Series Flow Rates chart for application data.
Dimensions: Overall 6-9/16 inch tall x 6-3/16 inch deep x 3-1/2 deep.
For exact dimensions, refer to document “00-02-0729 LM500 Installation Instructions”.
LM500/LM500-TF Shipping Dimensions: 9.5 x 7.5 x 11 in. (241.3 x 190 x 279.4 mm).
LM500/LM500-TF Shipping Weight: 3 lbs. 13.44 oz (1.74 kg)