Potentiometer Function

A potentiometer is a type of position sensor. The primary function of a potentiometer is to measure or monitor displacement. They can be used to measure either linear or rotary displacement and are available in different types depending on the application.

Potentiometer Function and Working Principle

The potentiometers in our portfolio are known as “conductive plastic” potentiometers, using a glass-filled nylon substrate and carbon ink. This is the type of potentiometer we will be referring to for the remainder of this blog post.

Within a potentiometer, there is a conductive element, a wiper and two terminals connected to either end. The wiper slides along or around (depending on if the sensor is linear or rotary) the conductive element either increasing or decreasing the voltage relevant to the resistance which is measured in Ohms. This voltage is proportionally divided over the operational range and is directly related to the displacement and to ensure a stable output, a signal conditioner is typically required.

Why use a Potentiometer?

Potentiometers are often selected for the following reasons;

• Lower cost than alternative solutions
• Wide operating temperature range
• Long life
• High accuracy
• High repeatability

Potentiometers are just one type of position sensor. Take a look at our full range of Position Sensors here.

Potentiometer Function – Uses of Potentiometers

Potentiometers are used in a wide variety of industries, some applications include;

Motorsport applications – ride height, steering systems. Gear shift measurement, suspension, throttle control on various motorsport vehicles.

Agricultural applications – steering systems on various types of agricultural vehicles and machinery.

Marine vehicles – rudder references and steering systems

Moving bridges/Ramps and barriers – positioning bridges, ramps and barrier open/close positions for vehicles and barriers within public transport.

Variohm Potentiometers

We have a range of different types of potentiometers available at Variohm – including our own range of linear potentiometer – our VLP range. Take a look at each type;

• Linear potentiometer
• Rotary potentiometer
• Membrane potentiometers
• Cable extension transducers

For more information on Potentiometers and their function please contact us.