Murphy Switch L 5937B User Manual

Float Actuated Oil Level  
Swichgage® instrument  
L-5937B  
Revised 06-06  
Catalog Section 15  
L100  
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  
L120  
**  
L127/L128  
L127 and L128  
Description  
Specifications  
®
Case: TROGAMID Nylon  
Float: Brass  
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.  
Maximum Pressure Rating (all models):  
30 psi (207 kPa) [2.07 bar]  
Rating: 2 A @ 30 VAC/DC  
2
L100 and L100W  
Wire: 16 AWG x 48 in. (1.5 mm x 1.2 m)  
Case: Die cast aluminum  
Float: Brass  
Mounting Bolts:  
1
3
L127: /4-20 NC x 2 in. (4 required)  
3
Rating: 2 A @ 30 VAC/DC  
L128: /8-16 NC x /4 in. (2 required)  
1
1
Vent Fitting: /4 in. (6 mm) tube x /8 NPT  
1
Inlet Fitting: Hex Nipple /4 NPT  
Warranty  
Hardware (shipped loose)  
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  
L100:  
1
Copper Tubing: /4 x 48 in. dia.  
(6 mm x 1.2 m)  
Application  
1
1
Reducer Bushing: /2 NPT x /4 NPT  
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:  
1
Close Nipple: /2 NPT  
1
Tee: /2 NPT, black pipe  
Models available with high and low options. See How to  
2
Wire: 16 AWG x 24 in. (1.5 mm x 610  
Order on reverse side.  
mm)  
L100W:  
**Products covered by this bulletin comply with EMC  
Council directive 89/336/EEC regarding electromagnetic  
compatibility except as noted.  
L100: Small engines and pumps with  
non-vented crankcase.  
1
3
3
Vent Tube: /4 x 3- /8 in. (6 x 86 mm)  
1
L100W: Small engines and pumps with  
vented crankcase.  
Reducer Bushing: /4 NPT x /4 NPT  
3
Close Nipple: /4 NPT  
3
Tee: /4 NPT, black pipe  
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.  
2
Wire: 16 AWG x 24 in. (1.5 mm x 610  
mm)  
L120  
Case: Cast Aluminum  
Float: Brass  
L128: Machined surface on crankcase, specifical-  
Rating: 2 A @ 30 VAC/DC  
ly, Arrow and Continental Emsco/Climax.  
1
Mounting Bolts: /4-20 UNC–2A (4 req'd)  
L-5937B page 1 of 2  
 

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