Murphy Series LM300 Installation Instructions

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.
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
locations. Enclosure Type 4 certified.
LM301-EX thru LM305-EX: CSA certified
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 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)
GENERAL INFORMATION
††
for non hazardous
††
for Class I, Groups C and D;
2
x 330 mm).
LM-92164N page 1 of 4
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
Diameter
4 ft. oil – 15 ft. oil
1/4 in. *
(1.2 m oil – 4.6 m oil)
(6 mm)
10 psig – 30 psig
1/8 in.
(68.9 kPa – 207 kPa)
(3 mm)
[.69 – 2.07 bar]
* Standard
NOTE: Friction losses due to piping NOT considered.
Optional Hose Kit: 15000355
Quantity Description
1 1/2 in. (13 mm) I.D. x
3 ft. (914 mm) long hose
1 1 in. (25 mm) I.D. x
3 ft. (914 mm) long hose
2 1/2 in. (13 mm) worm gear clamp
2 1 in. (25 mm) worm gear clamp
2 1/2 NPT x 1/2 in. (13 mm) barbed fitting
2 3/4 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.
LM-92164N
Revised 10-03
Section 15
(00-02-0176)
LM301-EX
Shown with optional hose kit fittings
**
Patent
5493086
Flow Rates
4.7 GPH - 31.0 GPH
(17.8 LPH - 117.3 LPH)
16.9 GPH - 32.1 GPH
(63.7 LPH - 121.5 LPH)