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Technologies -- Contact Electronic

Contact Electronic Gauging: is a system that turns the displacement of physical contact, from a part being measured, into an electric output signal.


The benefits of the contact electronic gauges compared to other alternative gauging technologies are the following:

  • Contact electronic measurement allows large measurement ranges; keeping excellent linearity and thermal stability over the entire range.
  • It is suitable to gage parts taken from the production line that are still wet.
  • It has a very fast response time to feature variations.
  • It offers a direct match with contact technologies used in Laboratories or receiving inspection departments (typically CMMs, roundness gages).
  • It is a cost-effective solution compared to other gauging technologies.
  • Contact electronic gauges are robust, sturdy, and highly reliable gages; suitable for use on the shop floor or close to the machine tools.
  • Compact size, miniature design possible.

The system is composed of mechanics that integrate an electronic circuit (transducer) capable of producing the variation of an electric signal, according to contact  movement. The electric output is available for processing by an electronic unit that digitalizes and elaborates it; providing the measurement value numerically and as a graphic display. The values can be transmitted as a digital output, either by a wired electronic, or by wireless transmission. It is also possible for this output to be statistically analyzed by the electronic unit. The output can be used for product traceability or to compensate machine tools to keep production under optimum control.  It can be sent to any other data collection network. Marposs designs its equipment and mechanics utilizing special methods to eliminate backlash, along with friction present in kinematics to create play free, long lasting devices. With this design, it slows or even prevents the effect of wear and tear that might reduce the quality of the measurement.

Marposs contact gauging equipment use’s three main transduction principles:

  • LVDT (Linear Variable Differential Transformer): ): A particular arrangement of a primary powered coil and two secondary coils is properly matched with a magnetic core to gives an electric output signal. The output varies according to the position of the core with respect to the primary and secondary a particular arrangement of a primary powered coil and two secondary coils. 
  • HBT (Half Bridge Transducer, or DVRT, Differential Variable Reluctance Transformer): The displacement of a magnetic core causes two inductive impedances to be unbalanced. The transduction technology has a less complex wire setup with a slight variation in performance, in terms of stability, depending on the size of the transducers and the range covered.
  • Air Gap: An inductive-type system transforms the mechanical displacement of a mobile ferromagnetic part, with respect to a fixed coil in an inductance variation. Recent developments have made the Air Gap technology very interesting, improving the linearity and stability performance of the air gap transducers. With its improved technology, the Air Gap system has proven to be very beneficial for compact applications, where space can be an issue for LVDT and HBT transducers.


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