Length measurement w/o rod
Special processes are applied to give the resistance tracks low friction, low tendency to stick or slip, resistance to abrasion and long-term stability.
Potentiometers are cost-effective devices widely used in automotive, molding machines, medical equipment, robotics, wood processing machinery, printing equipment, spraying, machine tools, sports equipment and other applications requiring precise measurement of displacement.
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Known as a variable resister used for voltage dividing, potentiometer is the simplest type of displacement sensor that coverts a mechanical motion into an electrical signal which is proportional to the mechanical displacement.
In below figure, a voltage is applied across the resistor and a wiper of the potentiometer is moving causing changes in resistance that is directly converted to voltage and/or current signals.
“Potentiometers comprise a resistive element, a sliding contact (wiper) that moves along the element, making good electrical contact with one part of it, electrical terminals at each end of the element, a mechanism that moves the wiper from one end to the other, and a housing containing the element and wiper.” [wikipedia]
Strokes on riveting machines;
Spring travel measurements on axes;
Length measurements on pipe bending equipment;
Offset measurements on bearings;
Measurement of feed, bending, deformation and press-fit displacements;
Length tolerance, displacements on electromagnets;
Measurement of advanced movements on pneumatic and hydraulic cylinders;
Measuring wind-up and unwinding lengths;
Measurements on undercarriages and dosing systems;
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Determining the movement on linear axes or electric spindles.