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BLSK1 Series
■
Operates Bilge Pumps or Alarms
■
Uses Proven “Air Cell” Actuated System
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Remote Switch and Moving Parts Kept
Unaffected by Corrosion
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Aluminum Body and Cover
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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 mount-
ing 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 pres-
sure 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)
MACT1 Tube Kit
(Sensor Line)
BLS1
(Bilge
Level
Switch)
MAC1
(Volume Cell)
Optional Mounting Bracket (15050737)
1/2 NPT for electrical
connections
6-5/32 in.
(156 mm)
5-1/2 in.
(140 mm)
4 feet long
(1.21 m) std.
1/4-20 hex bolt
(2-places) and nuts
9/32 in. (7 mm) dia.
4-places
3-1/4 in.
(83 mm)
5-3/16 in.
(132 mm)
2-3/8 in.
(60 mm)
1-1/2 in.
(38 mm)
BLSK-95107B
Revised 10-03
Catalog Section 15
(00-02-0052)
Bilge Level Switch System