Liquid Level Switch LLS14
Float-type level switch
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Operating Principle
A float guided on a non-magnetic tube follows the level of the liquid surface, thereby actuating some reed contacts, monostable or bistable, inside the tube via a built-in magnet system .
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Application Range
LLS14 is ideal wherever liquid levels have to be checked in process and storage tanks .
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Typical Liquids are :
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Water and aqueous fluids
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Acids/alkalis
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Organic and inorganic solvent
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All wetted parts can be coated with plastic for use in aggressive media .
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Interface Level Switching
If two liquids with different densities are stored in one tank, the level of the interface can be switched using a special interface-type float . The weight and buoyancy of the float are such that it floats on the heavier and sinks in the lighter liquid . The minimum difference in density between both liquids should be greater than 100 g/l (6.240lb/ft³), and the float must be fully immersed in the lighter liquid . If the lighter liquid is not always stored in the tank, this must be specified on ordering to ensure appropriate float design .
Technical data
Instrument Type LL S14
Measuring Conditions
Product Liquid
Temperature -40...+130˚C(-40...+266˚F)
Density ³0.4kg/l (25lb/ft³)
viscosity £5000mpa.s
Operating Pressure 30 bar (435 psig)
Ambient Temperature -40...+60˚C (-40...+140˚F)
Overall Length 0.2...6m (0.6...20ft)
Switching accuracy ±3mm (±0.12")
Materials
Housing Stainless steel 316L, 304L, Aluminum, P.P.
Guide tube Stainless steel 316L, 304L, P.P.
Float Stainless steel 316L, 304L, P.P.
Connection
Screw connection G 1/2", 1/2" NPT, G 1 1/2",1 1/2" NPT
, G 2",2" NPT
Flange All standard and size
Protection category IP 66
Operating voltage 30 V
Max. Current switched 80mA
Max. Contact Rating 2.4 W(VA)
