Murphy BLSK1 User Manual

BLSK1 Series

■

Operates Bilge Pumps or Alarms

■

Uses Proven “Air Cell” Actuated System

■

Remote Switch and Moving Parts Kept
Unaffected by Corrosion

■

Aluminum Body and Cover

■

Includes 3 Assemblies:

(1)

BLS1 Bilge Level Switch

(2)

MACT1 Tube Kit (Sensor Line and Fittings)

(3)

MAC1 “Air Cell” (Volume Cell)

Description

The BLSK1 Bilge Level Switch System gives
you all items and fittings necessary to install in
your bilge. Or, you can have only the parts you
want and you provide brackets, tubing and mount­ing hardware.

Using the proven “Air Cell” actuating system, all
moving parts and switching are remote from bilge
liquids and are thus not affected by corrosion,
rust, etc. All wetted parts are of non-corrosive
materials.

As bilge level rises a column of air is captured in
the MAC1 Air Volume Cell. The rising bilge
level compresses the column of air creating pres­sure against the large diaphragm in the BLS1
Bilge Level Switch and the switch trips. Switch
set point is adjustable.

The switch resets as the bilge is pumped out. Air
cell recharges itself during normal operation.

The BLS1 is constructed of materials not affected
by marine atmospheres; Aluminum or Bronze
body and cover, Buna-N diaphragm.

Specifications

BLS1 Bilge Level Switch

Snap-Switch SPDT (standard)

• 5 A @ 125, 250, or 480 VAC

• 1/2 A @ 125 VDC, 1/4 A @ 250 VDC

NOTE: A pilot relay may be used for higher
contact ratings (see Typical Wiring Diagram).

Case/Lid: Aluminum (std).

Bottom Plate: Glass-filled Nylon.
Process Connection: 1/4 NPTF.
Max. Pressure: 25

psi (172 kPa) [1.72 bar].

Conduit Connection (electrical): 1/2 NPT.

BLS1 Weight: 3 lb. (1.4 kg).

BLS1 Dimensions: 6-1/4 x 6-1/4 x 6-1/4 in.

(159 x 159 x 159 mm).

15050737 Optional mounting bracket

16 ga., 304 stainless steel (see Dimensions).

MACT1 Tube Kit (fittings included)

4 ft. (1.21 m) flexible non-corrosive
tubing, 1/4 in. (6 mm) dia. (cut to fit).

MACT1 Weight: 0.5 lb. (0.23 kg).

MACT1 Dimensions: 6 x 6 x 6 in. (152 x 152

x 152 mm).

MAC1 Air Cell (Volume Cell)

• Made of non-corrosive materials

• (2) 1/4-20 stainless steel hex bolts and nuts.

MAC1 Weight: 2 lb. (1 kg).
MAC1 Dimensions: 6 x 6 x 6 in. (152 x 152

x 152 mm).

Dimensions

(1)

(2)

(3)

BLSK-95107B

Revised 10-03

Catalog Section 15

(00-02-0052)

Bilge Level Switch System

6-5/32 in.
(156 mm)

Optional Mounting Bracket (15050737)

4 feet long

(1.21 m) std.

1/4-20 hex bolt
(2-places) and nuts

5-1/2 in.

(140 mm)

1/2 NPT for electrical
connections

MACT1 Tube Kit
(Sensor Line)

MAC1
(Volume Cell)

5-3/16 in.
(132 mm)

2-3/8 in.
(60 mm)

BLS1
(Bilge
Level
Switch)

3-1/4 in.
(83 mm)

9/32 in. (7 mm) dia.
4-places

1-1/2 in.
(38 mm)

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 attach­ing the cell to a stringer or bulkhead, etc. Vertical
adjustment may be necessary for final calibration
(see step 6).

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.

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 connec­tions.

4. Wire the SPDT snap-switch according to instruc-

tions and your requirements. See typical wiring dia­grams, 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).

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.

CAUTION:

Air cell tubing and connections must

remain air tight. Seal any holes placed in the air cell.

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.

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

Switch

Blank = SPDT, 5A

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.

How to Order the BLSK1

To order use the model number designation diagram below.

Typical Installation and Wiring

BLSK1

BLSK-95107B page 2 of 2

CONTROL SYSTEMS & SERVICES DIVISION

P.O. Box 1819; Rosenberg, Texas 77471; USA
[phone] fax [phone]

e-mail [e-mail]

MURPHY DE MEXICO, S.A. DE C.V.

Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje
San Luis Potosí, S.L.P.; México 78384
[phone] fax [phone]
Villahermosa Office [phone]
e-mail [e-mail]
www.murphymex.com.mx

FRANK W. MURPHY, LTD.

Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
[phone] fax [phone]
e-mail [e-mail]
www.fwmurphy.co.uk

MURPHY SWITCH OF CALIFORNIA

41343 12th Street West
Palmdale, California 93551-1442; USA
[phone] fax [phone]
e-mail [e-mail]
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
[phone] fax [phone]

e-mail [e-mail]

FW Murphy

P.O. Box 470248
Tulsa, Oklahoma 74147 USA
[phone]

fax [phone]
e-mail [e-mail]

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

WARNING

Customer
Supplied
Bracket

Bulkhead

BLS1 Bilge
Level Switch

Optional
Mounting
Bracket
(15050737)

Sensor Line
(MACT1 Tube Kit)

Volume Cell
(MAC1)

AIR

ST Series Alarm

BLS1 Switch

8–30 VAC

8–40 VDC

NO

C

NC

BLS1 Switch

NO

C

NC

K-1

+ve –ve

Power Supply

NOTE: Contact rating should be
appropriate for horse power of the pump.

+
–

Alarm #5

See Note

K-1

1
2
3
4

5
6

A

B

Operating
Bilge Pump

Alarm #1

A

B

Alarm #2

A

B

Alarm #3

A

B

A

Alarm #4

B