December 21, 2018

How to Choose the Correct LVDT for the Job


It’s common knowledge that when it comes to inductive transducers in general, very few can match what the linear variable differential transformer is capable of. It doesn’t matter whether your industry requires the use of servo-mechanics, or if you need to accurately gauge the movement of objects for satellites or the building of jet turbines for aircraft. The LVDT tends to be a one-size-fits-all device, capable of accurate measurement of force and translating it into different types of voltages and currents.

However, just because it’s capable in many different situations doesn’t mean that you can be complacent with regards to how it’s used. After all, there are many kinds of linear sensors, and each of them is equipped to accomplish specific After all, it would be a shame to utilise a linear transducer in a situation where it wouldn’t be able to use its full potential. That said, if you need any of the types of LVDTs mentioned, is an excellent resource.

Understanding the different types of linear variable differential transformers

As far as the types of LVDTs go, there are a few main renditions, including:

  • The unguided armature. If you’re looking for higher resolution qualities, look no further than the unguided armature. It has no limit on resolution, which means it can be used for a variety of different situations.
  • The captive armature. The captive armature is used in situations where extended use is required. It’s also fully capable of working at longer ranges, giving it advantages that the other linear sensors do not have.
  • The force extended armature. Not requiring a connection between the armature as well as the specimen being gauged, the force extended armature excels when being used to gauge objects that move slowly.

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The three main types of LVDT are available for any industry that wishes to benefit from their unique specialities. It isn’t recommended to use something like the unguided armature for longer ranges, just as it isn’t a good idea to use the force extended armature for objects moving quickly. It will still manage to provide data accurately but making the wrong decision could lead to issues down the line.

Looking into the special types of linear sensors

Aside from the three main kinds of LVDTs, there are still other types that are worth mentioning. For example, there is a kind of linear sensor that is made to be able to handle the pressures of conditions under the sea. The submersible linear sensor will be able to handle pressure up to five thousand psi, making it the perfect device for any industry doing work in subsea conditions. There is also the rotary variable differential transformer, which specialises in heavy, industrial repetitive work.

To conclude, while the LVDT is without a doubt one of the most useful inductive transducers, it doesn’t change the fact that misusing these devices will still lead to problems. Understanding when to use which type of linear sensor will help ensure that things go smoothly with your machinery and that accurate data can be measured no matter the situation.


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