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RDP Electronics has revealed how using an E725 digital indicator in combination with a pair of LVDTs can enable users to measure the gaps between rollers.

Measuring the gap between rollers, or checking parallelism to close tolerances is an essential requirement in a number of precision manufacturing processes.

Thanks to the E725’s capability to accept inputs from two separate transducers, in this case LVDTs of the same type and range, the indicator can be set to display individual readings, the average of both, or to check the difference to determine how parallel the rollers are.

In some situations there can be an analysis requirement to switch between these different sets of readings, achievable thanks to the E725’s RS232 serial communication interface.

Alternatively individual E725 amplifiers and LVDTs can measure gaps on either side of the roller and use the device’s 4-20mA signal as input to a PLC programmed to act in response to the gaps measured.

It is normally unacceptable for rollers to be driven in contact with each other so a spacer is inserted between them for the purpose of zeroing.

The E725 can be programmed to take account of the spacer size and return a reading that is corrected for the spacer size.

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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