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Installation Instructions
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.
1. Select a mounting location in lower part of the bilge
for the MAC1 air cell, but do not mount cell at this
time. MAC1 must be placed so that no debris will
become trapped inside it. Position the air cell
approximately 1-1/2 to 2 in. (38 to 51 mm) below
desired operation point and note location for attach-
ing the cell to a stringer or bulkhead, etc. Vertical
adjustment may be necessary for final calibration
(see step 6).
How to Order the BLSK1
To order use the model number designation diagram below.
BLSK1
Base Model
BLS1 = Bilge level switch
BLSK1 = Bilge level switch kit:
BLS1 (Bilge Level Switch)
MACT1 (Tubing kit)
MAC1 (Air cell)
Body (Lid and Case)
Blank = Aluminum
Accessories and Replacement Parts (order separately)
15050737: BLS1 mounting bracket.
15010205: 5 A snap-switch and movement assembly.
15000123: Diaphragm assembly.
15050823: Piston.
15050824: Knob for limit adjustment.
A copy of the warranty may be viewed or printed by going to www.fwmurphy.com/support/warranty.htm
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
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.
2. Mount the BLS1 switch via optional mounting
bracket 15050737 or one of your supply. Keep the
BLS1 switch within 4 ft. (1.21 m) off the MAC1 air
cell. Tubing must NOT have a loop or flat area for
moisture to collect. Always maintain a downward
slope.
CAUTION:
remain air tight. Seal any holes placed in the air cell.
3. Attach the MACT1 tubing kit to the air cell and to
the BLS1 switch. Any tubing can be used as long as
it does not corrode and it provides air tight connec-
tions.
4. Wire the SPDT snap-switch according to instruc-
tions and your requirements. See typical wiring dia-
grams, below.
5. The BLS1 trip point is preset to operate when bilge
level rises approximately 1-1/2 in. (38 mm) above the
bottom of the air cell. It will reset when level falls
approximately 3/4 in. (19 mm).
Switch
Blank = SPDT, 5A
Customer
Supplied
Bracket
A limited warranty on materials and workmanship is given with this FW Murphy product.
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
Air cell tubing and connections must
Typical Installation and Wiring
Bulkhead
BLS1 Bilge
Level Switch
Optional
Mounting
Sensor Line
Bracket
(MACT1 Tube Kit)
(15050737)
Volume Cell
(MAC1)
Warranty
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
BLSK-95107B page 2 of 2
6. Raise or lower the air cell so that the distance from
the hull to the trip point level on the side of the air
cell is equal to desired level of bilge. Secure the air
cell via the 2 hex bolts.
If necessary, adjustment can be made prior to
installation by placing the air cell in a bucket of
water and adjusting the white knurled knob inside
the BLS1 until the snap-switch actuates at the
desired level. Or, build a coffer dam around the air
cell in the bilge, add the desired amount of bilge
water, and adjust the switch trip knob as explained
above. BE SURE to remove coffer dam prior to
placing the BLS1 into service.
7. Verify proper operation at desired levels prior to
launch.
NOTE: The air cell will automatically recharge itself
anytime the bilge level falls below the air cell.
ST Series Alarm
8–30 VAC
BLS1 Switch
+
–
8–40 VDC
NO
C
NC
Alarm #5
BLS1 Switch
NO
See Note
C
NC
K-1
K-1
+ve
–ve
Power Supply
NOTE: Contact rating should be
appropriate for horse power of the pump.
MACQUARRIE CORPORATION
1620 Hume Highway
Campbellfield, Vic 3061; Australia
+61 3 9358 5555 fax +61 3 9358 5558
e-mail murphy@macquarrie.com.au
USA–ISO 9001:2000 FM 28221
UK–ISO 9001:2000 FM 29422
Alarm #1
1
A
2
B
3
A
Alarm #2
4
B
A
Alarm #3
5
B
6
A
Alarm #4
A
B
B
Operating
Bilge Pump
Printed in U.S.A.
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