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LM-92164N page 4 of 4
OPERATING RANGES OF SWITCHES
3/4 in.
(19 mm)
Normal
Operating Range
Low Zone
Shutdown or Alarm
High Zone
Shutdown or Alarm
3/8 in.
(10 mm)
3/8 in.
(10 mm)
3/4 in.
(19 mm)
Normal
Operating Range
Low Zone Alarm
Low-Low Zone Shutdown
3/4 in.
(19 mm)
3/8 in.
(10 mm)
1/4 in.
(6 mm)
SWITCH WIRING DIAGRAMS
LM301
SPDT
LM302
High/Low N.O.
DPST
LM303
High/Low N.C.
DPST
Green
Black
Normal
Red
Low
Float
Yellow
Green
Black
High
Float
High
Red
Low
Yellow
Normal
Low
Normal
Green
High
Float
High
Low
Blue
Normal
Low
Normal
Brown
Orange
Green
Normal
Float
Normal
Low-Low
Yellow
Low
Low-Low
Low
Black
Red
Green
Normal
Float
Normal
Low-Low
Blue
Low
Low-Low
Low
Brown
Orange
LM304
Alarm before
shutdown N.O.
DPST
LM305
Alarm before
shutdown N.C.
DPST
Normal
Operating Range
Low Zone
Shutdown or Alarm
3/4 in.
(19 mm)
3/8 in.
(10 mm)
Figure 7: LM301
Figure 9: LM304/LM305
Figure 8: LM302/LM303
This section applies only to models that have built-in switches. The illustrations
below and to the right show the dials and their operating ranges of the switches.
If levels are within the designated zones the switch(es) will activate. Notice that
a switch is capable of activating approximately 3/8 in. (10 mm) from the top of
the high zone and 3/8 in. (10 mm) from the bottom of the low zone. The dial in
Figure 9 shows that if level continues to drop into the low-low zone, a
shutdown will occur.
NOTE: Color zones on dial face show approximate normal operating zones.
Actual conditions may vary depending upon operating characteristics of the
engine. Placement of the LM300 according to the above instructions will
compensate for these conditions.
WARNING: DISCONNECT ALL ELECTRICAL POWER BEFORE CONNECTING ANY WIRES.
CONTROL SYSTEMS & SERVICES DIVISION
P.O. Box 1819; Rosenberg, Texas 77471; USA
+1 281 633 4500 fax+1 281 633 4588
e-mail sales@fwmurphy.com
MURPHY DE MEXICO, S.A. DE C.V.
Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje
San Luis Potosí, S.L.P.; México 78384
+52 444 8206264 fax +52 444 8206336
Villahermosa Office +52 993 3162117
e-mail ventas@murphymex.com.mx
www.murphymex.com.mx
FRANK W. MURPHY, LTD.
Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
+44 1722 410055 fax +44 1722 410088
e-mail sales@fwmurphy.co.uk
www.fwmurphy.co.uk
MURPHY SWITCH OF CALIFORNIA
41343 12th Street West
Palmdale, California 93551-1442; USA
+1 661 272 4700 fax+1 661 947 7570
e-mail sales@murphyswitch.com
www.murphyswitch.com
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.
MACQUARRIE CORPORATION
1620 Hume Highway
Campbellfield, Vic 3061; Australia
+61 3 9358 5555 fax +61 3 9358 5558
e-mail murphy@macquarrie.com.au
FW Murphy
P.O. Box 470248
Tulsa, Oklahoma 74147 USA
+1 918 317 4100
fax +1 918 317 4266
e-mail sales@fwmurphy.com
www.fwmurphy.com
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USA–ISO 9001:2000 FM 28221
UK–ISO 9001:2000 FM 29422
Printed in U.S.A.
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