Duralite VariWatt heating elements provide engineers tremendous
flexibility and control over conventional heating elements. VariWatt
elements can be fabricated with a change in the Watts / inch
along element of an order of magnitude. By using this capability
engineers can design zones or segments of specific energy output
at the element. Transitions can be smooth or abrupt.
Here are just two examples:
Figure 1 – VariWatt Power Distribution
Figure 2 – VariWatt Graded Power Distribution
As you can see the element in Figure 1 has the same length and
power as the element in Figure 2, but power is distributed differently.
VariWatt elements are fixed diameter elements with a variable
number of wire turns per inch. Elements are made with a pitch
(spacing of turns) from closewound wire to one turn in 10 inches
or more. Transition from one pitch to another pitch can be immediate
or vary smoothly over a distance. By using this technique power
can be distributed in a piecewise distribution as shown in the
illustrations (Fig 1 and Fig 2) or follow a mathematical expression
such as a sinusoid or logarithm, continuously changing over a
predetermined length.
Complex parts are consistent – especially important in
modern automated assembly systems.
Our staff can work with you to provide your product with the
following advantages:
 heat zones without costly control systems
 manage hot or cold
spots, reduce element failures due to localized overheating
 add energy at edges in continuous furnaces, increase usable
volume
 save energy – put it where
you need it most
 precision resistors
Provide landmarks for assembly operations to:
 decrease assembly
time and errors
 decrease failures by reducing turns per
inch at tight radius bends
 increase accuracy of finished
product
 reduce manual labor steps decreasing your product’s
cost
 provide consistent dimensions enabling automated assembly
What can VariWatt do for you? The only limit is your imagination!
