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RDP offers Linear Variable Differential Transducers (LVDTs) for monitoring cracks in structures in coastal environments such as sea-walls, harbours and tunnels.

The instruments are said to provide accurate measurement of even the smallest movement in cracks.

This provides essential diagnostic data that can be used to determine the cause and where necessary prompt appropriate remedial action.

For long-term tests, 316 stainless steel recognised as marine-grade stainless steel is preferred and LVDTs specified to IP68 and 230 bar are usually required.

Unguided rather than captive LVDTs are mounted on pins drilled either side of the crack.

Locations often call for long cable runs from the LVDTs’ location to instrumentation, which is achievable due to the 4-20mA output of the transducer.

RDP Electronics – experts in measurement solutions

Measurement experts RDP Electronics Ltd have 45 years experience in developing transducers for a diverse range of applications in research, prototype testing, industrial plant and machinery, or embodied in products. Examples are numerous, spanning industries that include aerospace, automotive, structural engineering and power generation. The company is responsible for the development and manufacture of a comprehensive programmme of transducer products and associated electronics to recognised international standards for accurate and reliable measurement of displacement, load, pressure and torque. Often the best solutions have a simple elegance that is possible thanks in part to the quality and high reliability of the transducers they supply. Because of their knowledge and expertise RDP’s skilled engineering team is frequently invited to propose solutions to measurement challenges.

RDP Design, manufacture and market a wide range of LVDT and other displacement transducers. LVDT Displacement transducers accurately measure position and displacement. The strength of the LVDT is in its principle of operation. As LVDT sensors are inductive, there is no electrical connection across the sensing element ensuring clean data and a long life.

The LVDT operation principle lends itself to use in extreme environments. LVDTs can be made to work submerged in sea water, in temperatures of 600°C (1100°F) in high nuclear ratiation and at pressures of up to 2000bar (30,000psi).

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