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Accommodate Holes and Cutouts:
Many times heaters need to fit around holes and cutouts. This can be designed in either etched foil or wire circuits to provide heating of the entire surface area.

Multi-layer Circuits:
Many times we need to maximize surface area to spread the watt density. Multi-layer circuits can be used to fit a high resistance in a small area by putting two circuits in series. The multi-layer circuit also allows Birk to put a sensor flex circuit on top of the heater circuit to maximize the heated area.

Sensors and Fuses within a circuit:
To control heat and temperature limits properly, thermostats, RTDs, thermocouples, thermistors, solid state sensors and fuses are strategically placed within a circuit to achieve the best operating thermal system.

Various Terminations:
Birk can offer many different terminations such as: leads from 36 gauge to 10 gauge, soldered terminals, connectors, pins and zero insertion force connections.
  

Shaded Watt Density:
Different heat intensities in the same circuit can provide an even heat across an entire heated area, and can compensate for cool heat sink edges.

Dual Voltage Circuits:
A single heater can be designed to operate on more than one voltage by including dual circuits with three leads.

Resistance Taps:
Since the heater circuit is a resistor, taps can be taken anywhere along that circuit to provide a given voltage to an LED or other component that requires other than line voltage.

Flex Circuits for Sensors:
Sensors are generally located within a heated area. Non-heated flex circuits can be built into the circuit design to carry the signal to the instruments.