A unique, patented Magnetic Linkage
isolates the electrical compartment from controlled product, reducing
maintenance and improving sensitivity. The sealed switch compartment and
sealed leads yield the utmost in reliable operation. A wide selection
of diaphragms and switches is available with choices of flange or
suspension mounting to fit your specific application. The dry level
Ultra-MagTM Level Switch is extremely sensitive and very economical. The
magnetic linkage makes this simple explosion-proof diaphragm switch the
most rugged and reliable level control for a variety of products.Mounting Selection: A choice of either suspension or flange
mounting is available to match your application. Flange mounting is the
best choice for control of low or intermediate level in vessels
containing granular product that does not "bridge", "rathole", or
otherwise build up on vessel walls. Choose suspension mounting for high
level in vessels and for better operation with "bridging" product.
See below for more information on suspension and flange mounting kits.
Note that the mounting configuration is represented by the letter "S"
for suspension or "F" for flange which is the second digit in the part
number.Diaphragm Selection: A wide variety of diaphragms is available to
match product bulk density, flowability, abrasiveness and temperature
requirements while providing
maximum sensitivity. The best choice for vessels subject to pressure or
vacuum is "breathable" fabric (P Series), requiring no venting. Non-porous elastomer (G Series)
type diaphragms are the best choice for more abrasive product and
broader temperature range applications.
Venting is always required with the G series and if used in pressurized
vessels, venting to the tank atmosphere is required to allow pressure
equalization. A slide rule "Diaphragm Selector" is available from the
factory to help you choose the diaphragm best suited to your
application.Suspension Mounting is normally used for high level monitoring in
vessels. For product over 20 lbs./cu. ft., the level switch (diaphragm
face) should be located
about 1/3 of the distance from the vessel wall to the point of entry of
the product. For product less than 20 lbs./cu. ft., the unit should be
located closer to the point of entry of the product, about 1/2 the
distance from the vessel wall to the point of entry. Pressure required
to depress the diaphragm and trip the switch is in the range of 5-15 oz
in the horizontal direction (perpendicular to the diaphragm). Suspension
mounting provides the easiest vertical adjustment capability, greatest
sensitivity and best maintenance conditions.Suspension Assembly Kits: Pre-assembled kits are available from
the factory, or you can build your own kits using standard pipe
fittings. Pipes and
fittings are normally galvanized steel, but aluminum and stainless steel
pipes and fittings are available. Units pictured above are secured to a
steel cover plate that rests on a rectangular steel flange welded
into the top of the vessel. Aluminum and stainless coverplates and
flanges are also available. Standard 48" long x 1" pipe provides working
depth (WD) up to 48". Longer pipe (to provide greater WD) is available.
GS Series switches have upper (L1 = 28" standard) and lower (L2 = 20"
standard) 1" pipes, with a tee (for stilling pot) in between. A stilling
pot is required to equalize pressure and keep dirt from building up
behind the diaphragm. PS series require a 1/2" conduit in 1" suspension
pipe for explosion-proof applications. The 1/2" conduit (56" standard
length) is a standard part of the GS series assembly.