Murphy Plumbing Product BLSK1 Series User Manual

BLSK-95107B  
Revised 10-03  
Catalog Section 15  
(00-02-0052)  
Bilge Level Switch System  
BLSK1 Series  
(1)  
Operates Bilge Pumps or Alarms  
Uses Proven “Air Cell” Actuated System  
Remote Switch and Moving Parts Kept  
Unaffected by Corrosion  
(2)  
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)  
(3)  
Description  
Dimensions  
Case/Lid: Aluminum (std).  
Bottom Plate: Glass-filled Nylon.  
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 mount-  
ing hardware.  
5-1/2 in.  
(140 mm)  
BLS1  
Process Connection: 1/4 NPTF.  
(Bilge  
Level  
Max. Pressure: 25 psi (172 kPa) [1.72 bar].  
Conduit Connection (electrical): 1/2 NPT.  
BLS1 Weight: 3 lb. (1.4 kg).  
Switch)  
6-5/32 in.  
(156 mm)  
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.  
1/2 NPT for electrical  
connections  
BLS1 Dimensions: 6-1/4 x 6-1/4 x 6-1/4 in.  
(159 x 159 x 159 mm).  
MACT1 Tube Kit  
(Sensor Line)  
15050737 Optional mounting bracket  
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 pres-  
sure against the large diaphragm in the BLS1  
Bilge Level Switch and the switch trips. Switch  
set point is adjustable.  
16 ga., 304 stainless steel (see Dimensions).  
4 feet long  
(1.21 m) std.  
MACT1 Tube Kit (fittings included)  
4 ft. (1.21 m) flexible non-corrosive  
tubing, 1/4 in. (6 mm) dia. (cut to fit).  
MAC1  
(Volume Cell)  
MACT1 Weight: 0.5 lb. (0.23 kg).  
1/4-20 hex bolt  
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.  
MACT1 Dimensions: 6 x 6 x 6 in. (152 x 152  
x 152 mm).  
3-1/4 in.  
(83 mm)  
(2-places) and nuts  
5-3/16 in.  
(132 mm)  
MAC1 Air Cell (Volume Cell)  
Made of non-corrosive materials  
(2) 1/4-20 stainless steel hex bolts and nuts.  
Optional Mounting Bracket (15050737)  
2-3/8 in.  
(60 mm)  
9/32 in. (7 mm) dia.  
MAC1 Weight: 2 lb. (1 kg).  
Specifications  
4-places  
MAC1 Dimensions: 6 x 6 x 6 in. (152 x 152  
x 152 mm).  
BLS1 Bilge Level Switch  
1-1/2 in.  
(38 mm)  
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).  
 

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