LINC milton roy L471 Series, Instruction Manual, Page: 4 / 24

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LEVEL CONTROL SWITCHES
L I N C - L 4 7 1 & L 4 7 1 S C S E R I E S
1
When a relay assembly is used, Class I, Div. 1, is limited to Groups C and D.
The LINC-L471 & L471SC Series:
Electric Level Control Switches
Features:
• Repairs on-site in 20 minutes with the
Quick-Change switch cartridge
• The Manual Override option enables
mechanical and electrical function test-
ing while installed
• Environmentally-isolated design keeps
operational fluids away from electrical
circuitry
• Quick-Change, inexpensive replacement parts
• One L471 inverts for both High & Low
level applications
• One L471 provides both normally open,
and normally closed switching by simply
inverting the L471
• Certified as explosion-proof
1
for Hazard-
ous Locations: Class I , Div. 1, Groups A,
B, C, D; Class II , Div. 1, Groups E, F, G;
and Class III , Div.1, by CSA a Nationally
re
cognized Testing Laboratory in the U.S.
nd Canada
• Standard 316 Stainless Steel wetted and
housing components for corrosion
resistance
• Sealed switch cartridge prevents
dust, fluids, and corrosion from
interfering with electrical circuity
• Available with Stainless Steel and
Polypropylene displacer options for
various process pressures
Benefits:
• Easy to Repair................................
• Easy to Field Test............................
• No Leaks..........................................
• Lower Operating Costs...................
• Lower Inventory...............................
• Versatile...........................................
• Safe...................................................
• Corrosion Resistant.........................
• Reliable.................................................
• High & Low Pressure
Applications......................................
Application:
Used as a high & low level control,
the L471 & L471SC can activate
alarms, provide a switch input for
control systems, or perform a variety
of desired electrical switch operations
actuated by a liquid or liquid interface.
Operation:
As the float is moved by varying liq-
uid height, a magnet is moved closer
to or further away from a switch enclo-
sure. As the magnet moves closer, a
reed switch in the enclosure closes.
As the magnet moves further away, the
switch opens. The arm containing the
magnet also acts as a counterweight
for the float.
The float is small and will operate in
liquids with a specific gravity as low as
0.4. The interface type will operate with
a specific gravity differential as low as
0.1. This small float permits an eco-
nomical installation in locations where
other controls would be cost prohibi-
tive. Available with a relay mounted in
an explosion-proof case allowing the
control of larger electrical loads. The
manual override option allows the
operator to manually move the float
arm to the test switch position.
a