In certain situations a standard LVDT (Linear Variable Differential Transformer) displacement transducers may not meet the specific requirements of some applications and this is when Sensonics’ successful bespoke design service is ideal. Whether for a new application, replacing an obsolete product or your existing supplier cannot meet your needs; Sensonics has the technical expertise to deliver a cost-effective solution. It can guide you through the options within its standard range with customisation for a form fit and function match, or develop a new design from scratch.

LVDTs can be used for a diverse range of applications. For example; casing and cylinder expansion measurement on steam turbines, valve position monitoring, crack monitoring on critical buildings, tunnels and bridges, deformation when a structure is under load from passing vehicles and for actuator controls providing feedback of actuator position either alongside, or for high pressure designs for OEM internal mounting. Also, bespoke designs for more specialised applications such as submersible, sub-sea and radiation proof.

The operational principle of an LVDT is as an electromechanical device it produces an electrical signal whose amplitude is proportional to the displacement of the transducer core. It consists of a primary coil and two secondary coils which are symmetrically placed on a cylindrical former. A magnetic core inside the coil assembly provides a path for the magnetic flux linking the coils and the electrical circuit is configured with the secondary coils in series opposition.

When an alternating voltage is introduced into the primary coil and the coil is centrally located, then an alternating voltage is mutually induced in both secondary coils. The resulting output is zero as the voltages are equal in amplitude and in 180º opposition to each other. When the core is moved away from the null position the voltage in the coil toward which the coil is moved increases due to the greater flux linkage and the voltage in the other primary coil decreases due to the lesser flux linkage. The net result is that a different voltage is produced across the secondary tappings which varies linearly with change in core position. An equal effect is produced when the core is moved from a null in the other direction, but the voltage is 180° different in phase.

LVDTs can be operated where there is no contact between the core and extension rod assembly with the main body of the LVDT housing the transformer coils making it ideal for measurements where friction loading cannot be tolerated, but the addition of a low mass core can. Examples of this are fluid level detection with the core mounted on a float and creep tests on elastic materials. This frictionless movement also benefits the mechanical life of the transducer, making LVDTs valuable in applications such as fatigue life testing of materials or structures. This is a distinct advantage over potentiometers which are prone to wear and vibration.

The principles of operation of LVDTs means they can be configured in a variety of housings depending on the degree of mechanical protection required and the use of rod end bearings, linear rolling element bearing and flexible conduit helps them to withstand the most severe environments.


Northbridge Road

01442 876833

More products
Individual service for signal integrity
The demands on connection technology performance are constantly increasing. By providing customised support, Phoenix Contact helps customers select connection components to ensure the highest possible signal integrity.
Aveva MES rises in the leader ranks of the latest Gartner report
Aveva’s Manufacturing Execution Systems (MES) offering, which is deployed in the UK & Ireland by AVEVA Select partners SolutionsPT, has been recognised as a global leader in industrial software in the latest 2022 Gartner Magic Quadrant for Manufacturing Execution Systems.
Siemens selected by Microsoft for RAMP Programme
Siemens Digital Industries Software has been selected to participate in the Rapid Assured Microelectronics Prototypes (RAMP) Phase II initiative.
Thomson Industries exhibits linear actuators for the marine industry
Thomson Industries will be exhibiting at the 30th Shipbuilding, Machinery and Marine Technology (SMM) trade fair in Hamburg in September, showcasing its comprehensive line of electric linear actuators for marine applications.
Harwin and MSA Components sign German distribution deal
Harwin is bringing greater strength to its German supply chain through a new strategic partnership with MSA Components. The agreement allows MSA to offer all the latest products from Harwin’s extensive portfolio.
Mould making at Emka for injection moulding of plastics and metals
Emka reports that it is now one of the top three mould makers in Europe – producing 900 moulds a year for plastic injection, including polyamide/glass and Grivery, as well as zinc and aluminium die casting.
Kontron receives VDC Research’s Gold Award for vendor satisfaction
Kontron has been recognised for outstanding customer satisfaction. The company has received the Gold Vendor Satisfaction Award for IoT and Embedded Hardware technology from VDC Research.
Mouser wins Vishay Distributor of the Year Award
Mouser Electronics has received the 2021 High Service Distributor of the Year award from Vishay Intertechnology, one of the world’s largest manufacturers of discrete semiconductors and passive electronic components.
What changes does the new machinery regulation bring?
As the machinery regulation replaces machinery directive 2006/42/EC, Dirk Meyer, specialist engineer solution architect at Eaton, looks at what is changing.
Klüber Lubrication receives Schaeffler Supplier Award 2022
Schaeffler has awarded Klüber Lubrication with the Supplier Award 2022 in the field of quality. The jury emphasised in particular the global supplier's strong commitment to the compliance with quality standards.

Login / Sign up