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Linear Potentiometer

Linear Potentiometer or Displacement sensors are used in machines to measure the position, the distance or a displacement. The measuring unit is mainly used in automation technology. During the measurement, the physical quantity is converted into a measurable electrical signal which is transmitted to a control or display. In this way, automated processes can be controlled and monitored. A typical application is, for example, the detection of the position of the tool in injection moulding machines. Here, the movement is linear. It is also possible to detect the position of three-dimensional movements, such as the rollers in sheet metal bending machines.

Measurement type

Stroke length

Output signal

Displacement transducer design

The displacement transducer measuring unit consists of a housing and a linear movable stroke rod. Depending on the measuring principle, the unit has a measuring resistance band and movable slider or a waveguide and movable magnet. The measured value is transmitted electronically via a permanently connected cable or via a transmission cable with plug. Depending on the product variant, the measurement signal can be transmitted as a resistance value or analogue signal.

The displacement transducers are mounted on a machine via linearly movable clamps on the housing in the case of linear movements, or with ball joints in the case of three-dimensional movements of the machine parts. The supply voltage and signal line are connected via a cable with stranded wires or connector plug.

Linear potentiometer

The measurement is carried out via the resistance measurement. A constant voltage is applied to the measuring unit, which provides a corresponding resistance value depending on the position of the slider on the measuring resistor band. Thus, the position can be clearly determined via the resistance value.

Magnetostrictive displacement transducers

The magnetostrictive measurement is similar to that of a linear potentiometer with the difference that it is contactless, wear-free and has a higher accuracy. The magnet moves linearly over the waveguide and provides a unique measured value depending on the position.

Application areas displacement transducers

  • Injection moulding machines
  • Sheet metal bending machines
  • Filling systems
  • Lifting platforms