Murphy Series LM300 installation instructions LM301-EX, Specifications, Optional Hose Kit

Installation Instructions for Level Maintainers

Model Series LM300

Read the following instructions before installing. A visual inspection of this product for damage during shipping is recommended before mounting. These installation instructions are intended for all LM300 series models.

LM-92164N

Revised 10-03

Section 15

(00-02-0176)

GENERAL INFORMATION

WARNING

BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT

✔Disconnect all electrical power to the machine.

✔Make sure the machine cannot operate during installation.

✔Follow all safety warnings of the machine manufacturer.

✔Read and follow all installation instructions.

LM300: Level Maintainer only (no switches).

LM301: Low switch contacts for low level shutdown or alarm. Four wires, SPDT.

LM302: Two switches for low and high level shutdown or alarm. Four wires, DPST, wired N.O. in normal operating ranges.

LM303: Two switches for low and high level shutdown or alarm. Four wires, DPST, wired N.C. in normal operating ranges.

LM304: Two switches. Alarm before shutdown on low level and shutdown on low-low level. Four wires, DPST, wired N.O. in normal operating ranges.

LM305: Two switches. Alarm before shutdown on low level and shutdown on low- low level. Four wires, DPST, wired N.C. in normal operating ranges.

Specifications

Case/Cover: Die cast aluminum.

Switch Housing: Aluminum.

Approval Rating: LM301 thru LM305 : CSA certified†† for non hazardous locations. Enclosure Type 4 certified.

LM301-EX thru LM305-EX:CSA certified†† for Class I, Groups C and D; Class II, Groups F and G hazardous locations. Enclosure Type 4 certified.

Float: Rigid polyurethane foam. Polyurethane coated.

Maximum Ambient Temperature: 250°F (121°C)

Oil Inlet Connection: Top entry 1/2-14 NPT with built-in filter screen (removable for cleaning).

Inlet Orifices: 1/4 in. (6 mm) standard. 1/8 in. (3 mm) available.

Wire (switch models): 18 AWG x 13 in. (1.0 mm2 x 330 mm).

Maximum Inlet Pressure (MIP):

Max. Differential: 2 in. (51 mm) between running and stationary oil level. 30 psi (207 kPa) [2.07 bar].

with 1/8 in. (3 mm) orifice. 15 ft. oil (4.6 m oil)

with 1/4 in. (6 mm) orifice.

Maximum Case Pressure (MCP): 15 psi (103 kPa) [1.03 bar].

Orifice Seal†: Buna-N Thumb-Valve™

Switch Contact: Silver, SPDT snap acting, 10A @ 125, 250VAC; 10A @ 30VDC.

(1 only for low level; 2 only for high & low; or 2 only for low with alarm before shutdown)

LM301-EX

Shown with optional hose kit fittings

**

Patent 5493086

Outlet Connection: 3/4-14 NPT left side, right side, and bottom.

Crankcase Balance Vent Fitting: 1/2-14 NPT.

Mounting: Accepts Murphy pipe mounting or universal mounting brackets.

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.

Test Knob: Rotate to test switch operation. Turn clockwise for low level test and turn counterclockwise for high level test.

Flow Rate Test: Using SAE 30 @ 32°F (0°C).

Orifice	Pressure	Flow Rates
Diameter
1/4 in.*	4 ft. oil – 15 ft. oil	4.7 GPH - 31.0 GPH
(6 mm)	(1.2 m oil – 4.6 m oil)	(17.8 LPH - 117.3 LPH)
1/8 in.	10 psig – 30 psig	16.9 GPH - 32.1 GPH
	(68.9 kPa – 207 kPa)
(3 mm)	[.69 – 2.07 bar]	(63.7 LPH - 121.5 LPH)

*Standard

NOTE: Friction losses due to piping NOT considered.

Optional Hose Kit: 15000355

Quantity Description

11/2 in. (13 mm) I.D. x

3 ft. (914 mm) long hose

11 in. (25 mm) I.D. x

3 ft. (914 mm) long hose

21/2 in. (13 mm) worm gear clamp

21 in. (25 mm) worm gear clamp

21/2 NPT x 1/2 in. (13 mm) barbed fitting

23/4 NPT x 1 in. (25 mm) barbed fitting

††CSA certified with switch contacts rated at 10 A @ 250 VAC (standard).

**Products covered by this bulletin comply with EMC Council directive 89/336/EEC regarding electromagnetic compatibility except as noted.

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