Linear Variable Differential Transducer

LVDT (Linear Variable Differential Transformer), is an absolute position/displacement transducer that will convert a position or linear displacement from a mechanical reference (zero, or null position) into a proportional electrical signal containing phase (for direction) and amplitude (for distance) information. The LVDT operation does not require an electrical contact between the moving part (probe or core assembly) and the coil assembly to work, but instead relies on electromagnetic coupling; this and the fact that LVDTs can operate without any built-in electronic circuitry are the primary reasons why they have been widely used in applications where long life and high-reliability equipment under very severe environmental conditions as required, such as in Military/Aerospace, process controls, automation, robotics, nuclear, chemical plants, hydraulics, power turbines, and many others.


LVDT’s come in two different ranges, either DC or AC output. DC versions, in general, have integral electronics or there is limited need for complex signal conditioning or AC variants which will require signal conditioning. There are lots of object application based uses for an LVDT device, as they are not electromechanical there are many good uses for many devices.

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LVDTs Common Applications

LVDTs are robust and offer outstanding repetition which means they are suitable for use in a range of industries and in applications which involve ongoing measurements. LVDTs are used in applications such as the following:

Power turbines, hydraulics, aircraft, satellites, nuclear reactors, factory automation, servo-mechanisms, weight-sensitive applications, general industrial application, process and control, materials testing.

In applications where both accuracy and reliability are key; an LVDT is well suited and recommended. Our LVDTs are high quality and reliable enough to be used in applications such as the following:

Friction Free – they are non-contacting and therefore friction-free meaning they offer long life

Fast Response – the fast response time of the LVDT means that time can be managed effectively during use.

Robust – being robust means that LVDTs can be used in extreme applications and environments.

Versatile – different configurations are available to suit different applications.

Considerations when choosing should be location and size of the site as AC versions are much smaller body length than DC, and also temperature.