How does a magnetic potentiometer work?

A magnetic potentiometer or position sensor works similarly to a standard potentiometer but usually allows for contactless position sensing by allowing a gap between what is actuating and the wiper or plunger that is actually making contact with the sensor surface.

In short, the wiper/plunger is moved via magnetic field instead of direct physical contact with the actuator. Usually this means that you have two attracting magnets. One that is housed within a hollow section of the sensor, and one connected to the actuator, and when they are close enough to interact then position is sensed.

Historically magnetic potentiometers are more difficult to make as accurate as direct actuation with a full contact wiper/plunger, but Spectra Symbol has made major strides in recent years to bring the linearity below the industry standard of +/- 5%.

If you have an application that requires a contactless solution for linear or rotary position sensing, then feel free to shop our current MagnetoPot stock options & connector variations, or give us a call to discuss the unique needs of your application. We are happy to consult with you for free to see if we have a good fit for you!