CarTech Temperature Compensator "30"® alloy is a 30% nickel-iron alloy whose magnetic permeability decreases at a controlled rate with increase in temperature. The alloy has been used in electrical circuits to compensate for the effect of variations in ambient temperature. Three types of CarTech Temperature Compensator "30" are available, each having different temperature-permeability characteristics which are controlled precisely by special processing, heat treatment and composition balance.

These materials could be considered for use in "shunt" applications. A shunt is a conductor joining two points in a magnetic line circuit and forming a desired circuit or path through which some of the magnetic lines pass. At low temperatures the magnet is strong but the shunt, having high permeability, diverts a portion of the "flux" (magnetic current) away from the gap. As temperature increases the pole strength of the magnet decreases, but the permeability of the shunt decreases, so less flux is diverted through the shunt.

If the shunt is properly designed, the flux in the gap can be held constant over a fairly wide temperature range, thereby compensating for temperature changes.

CarTech Temperature Compensator "30" alloy operates over a temperature range from -60/160°F (-51/71 °C).

Applications:
The three different types of this alloy have been used as shunts in watt-hour meters, speedometers, tachometers, voltage regulators and similar electrical instruments.