Murphy L-5937B - Manual

L-5937B page 1 of 2

For Small Engines and Pumps

■

See Oil Level and Condition
Without Shutting Down

■

Shutdown or Alarm on Low Lube Level

■

Adjustable Limit Switch for Alarm
and/or Shutdown

■

Save on Reduced Downtime
and Repair Costs

■

Simple Installation

Description

These float actuated Oil Level Swichgage instru-
ments are a combination oil level sight gage and
adjustable, low and/or high limit switch. The
limit switches are normally open during opera-
tion–yet close if the level drops or rises to where
the float contacts the limit screw. The contact
completes a circuit to ground a magneto or trip a
Murphy magnetic switch. The magnetic switch
can be used to activate alarms and/or shutdown.
Models are also available without limit switches.

Application

The level instruments described above can be
used on a variety of crankcases, pump gearcases,
or oil reservoirs–primarily on small engines and
pumps. The following list displays the model
and its typical application:

L100

†

: Small engines and pumps with

non-vented crankcase.

L100W

†

: Small engines and pumps with

vented crankcase.

L120

†

: Machined surface on crankcase such as

Witte, National-Oilwell/Garland.

L127

: Machined surface on crankcase, specifi-

cally, Fairbanks-Morse ZC Series and
Bell Engines.

L128

: Machined surface on crankcase, specifical-

ly, Arrow and Continental Emsco/Climax.

Specifications

■

Maximum Pressure Rating (all models):

30 psi (207 kPa) [2.07 bar]

■

L100 and L100W
Case:

Die cast aluminum

Float:

Brass

Rating:

2 A @ 30 VAC/DC

Vent Fitting:

1

/

4

in. (6 mm) tube x

1

/

8

NPT

Inlet Fitting:

Hex Nipple

1

/

4

NPT

Hardware (shipped loose)

L100:

• Copper Tubing:

1

/

4

x 48 in. dia.

(6 mm x 1.2 m)

• Reducer Bushing:

1

/

2

NPT x

1

/

4

NPT

• Close Nipple:

1

/

2

NPT

• Tee:

1

/

2

NPT, black pipe

• Wire:

16 AWG x 24 in. (1.5 mm

2

x 610

mm)

L100W:

• Vent Tube:

1

/

4

x 3-

3

/

8

in. (6 x 86 mm)

• Reducer Bushing:

3

/

4

NPT x

1

/

4

NPT

• Close Nipple:

3

/

4

NPT

• Tee:

3

/

4

NPT, black pipe

• Wire:

16 AWG x 24 in. (1.5 mm

2

x 610

mm)

■

L120
Case:

Cast Aluminum

Float:

Brass

Rating:

2 A @ 30 VAC/DC

Mounting Bolts:

1

/

4

-20 UNC–2A (4 req'd)

■

L127 and L128
Case:

TROGAMID

®

Nylon

Float:

Brass

Rating:

2 A @ 30 VAC/DC

Wire:

16 AWG x 48 in. (1.5 mm

2

x 1.2 m)

Mounting Bolts:

• L127:

1

/

4

-20 NC x 2 in. (4 required)

• L128:

3

/

8

-16 NC x

3

/

4

in. (2 required)

Warranty

A limited warranty on materials and workmanship
is given with this FW Murphy product. A copy of
the warranty may be viewed or printed by going to
www.fwmurphy.com/support/warranty.htm

L100

L120

L127/L128

†

Models available with high and low options. See

How to

Order

on reverse side.

**

Products covered by this bulletin comply with EMC

Council directive 89/336/EEC regarding electromagnetic
compatibility except as noted.

**

L-5937B

Revised 06-06

Catalog Section 15

Float Actuated Oil Level
Swichgage

®

instrument