LVDT Sensors

Linear Variable Differential Transformers and Transducers (LVDTs)

Hoffmann-Krippner LVDT sensors amplify your ability to measure and monitor precise movements in equipment and industrial automation systems

By converting an object’s linear movement into an electrical signal, LVDTs – or Linear Variable Differential Transformers, also known as Linear Variable Displacement Transducers – can measure movements as large as several inches in scale, down to millionths of an inch.

Depending on the application, LVDTs can be a critical component in maintaining high-performance functionality, enabling infinitesimally fine-tuned accuracy, and ensuring that industrial automation systems run seamlessly in a variety of settings and circumstances.

  • Temperature ranges up to 125°C
  • Protection class up to IP68
  • Linearity tolerances from 0.25% (or better upon request)
  • External thread on some product models

Why use a Hoffmann-Krippner LVDT Sensor?

Extreme precision powers peak performance

Friction-Free Operation
If the LVDT is installed correctly, the LVDT’s core will have no mechanical contact with the coil assembly, so no rubbing, dragging, or other source of friction will distort readings or affect performance. In turn, this friction-free operation ensures accuracy in materials testing, vibration displacement measurements, high resolution dimensional gaging systems, and more.

Infinite Resolution
The LVDT can measure any changes in core position. This infinite resolution capability is limited only by the noise in an LVDT signal conditioner and the output display’s resolution, giving an LVDT outstanding repeatability and allowing for very precise control schemes that can help increase operating efficiency, save energy or fuel, and more.

Dynamic response fuels fast, repeatable functionality

Fast Dynamic Response
With correct installation, the absence of friction during ordinary operation permits an LVDT to respond very fast to changes in core position, limited only by the inertial effects of the core’s slight mass.

Null Point Repeatability
The location of an LVDT’s null point is extremely stable and repeatable, even over its very wide operating temperature range. This makes an LVDT perform well as a null position sensor in closed-loop control systems and high-performance servo balance instruments.

Unlimited mechanical life gives LVDTs the ultimate staying power, even in high-stress applications

Unlimited Mechanical Life
As no parts can rub together or wear out, LVDTs enjoy unlimited mechanical life, crucial for applications requiring high-reliability like aircraft, satellites and space vehicles, and nuclear installation; as well as many industrial process control and factory automation systems.

Absolute Output
An LVDT can retain information even in the event of a power outage. As an absolute output device, the position data being sent from the LVDT will not be lost in the event of power loss. When the measuring system is restarted, the LVDT’s output value will be the same as it was before the power failure occurred.

Expert engineering and consultation electrifies performance potential

User experience
Our LVDTs are engineered with users in mind. The modern design is easy to calibrate, can connect to a wide variety of computer systems, customers can determine how data is displayed, and more.

Extensive consultation
In addition to outstanding quality, reliability, accuracy, and life expectancy, Hoffmann-Krippner LVDTs come with extensive consultation. Our engineers offer a vast well of knowledge within the automation world. If clients have an LVDT application but can’t find a solution, we can help by designing and developing a custom LVDT sensor.

If you’d like to speak with one of our consultants to solicit input about your project or to inquire about our LVDTs, please send us a message here.

You can also skip right to our catalog of LVDT products, or keep scrolling down to learn how and where our LVDT sensors can improve your applications.

Where to use our LVDT sensors: Areas of Application

Modern LVDTs are making inroads into new use-case scenarios, especially in rugged environments where other sensing equipment might fail. Hoffmann-Krippner LVDTs are perfect for harsh industrial environments subject to:

  • High temperature and pressure ranges (with operation under pressure up to 400 bars
  • High acceleration and measuring cycles
  • High vibration and very fast movements

The extreme precision of Hoffmann-Krippner LVDTs makes them perfect anywhere movement must be measured down to very small strokes, with measurements under one millimeter, including:

  • Automation technology
  • Testing facilities and applications
  • Mechanical engineering
  • Medical technology production lines

Ready to start shopping? Skip right to our catalog of LVDT products, or keep reading to learn how our LVDT sensors work.

How Does an LVDT Sensor Work?

The internal structure of an LVDT looks much like a transformer, consisting of a primary winding centered between a pair of two identically wound secondary windings. The two secondary windings are typically connected in “series opposing” (differential).

The LVDT’s primary winding is energized by a constant-amplitude AC power source. The core couples the resulting magnetic flux to adjacent secondary windings. If the core is positioned midway between the secondary windings, equal flux is coupled to each secondary, so the voltages induced in each winding is equal. This is the null point, since the differential voltage output – i.e., the difference in voltage between the two secondary windings – is zero.

However, if the core moves closer to one those than other, more flux is coupled to one secondary winding and less to the other, resulting in differential voltage. Through these very fine electrical changes, the displacement of the core – and hence of the object – can be measured with extreme precision.

Our LVDT Product Line and Features

Standard LVDT Series

Our Standard LVDT series comes in a nickel plated 20 mm diameter steel casing and is available in stroke length from 5mm to 200mm. This series requires external signal conditioning. Available with swivel head, spring return and as unguided armature.

Miniature LVDT Series

Our Miniature LVDT series comes in a nickel-plated steel casing with 4mm and 8mm diameter. This series requires external signal conditioning and is available in stroke length from 2mm to 20mm. Available with spring return and as unguided armature.

LVDT with External Thread for Easy Installation 

This product series comes in a nickel-plated steel as well as blue zinc-plated steel casing with M12 and M18 thread. Available in stroke length from 2mm to 20mm. This series requires external signal conditioning. Available with spring return and as unguided armature.

LVDT with Integrated Signal Processing

This product series comes in a nickel-plated 20mm diameter steel casing and is available with stroke length from 2mm to 200mm. This is series is equipped with internal signal conditioning. Available with swivel head, spring return and as unguided armature.

LVDT with External Thread and Integrated Signal Processing

This product series comes in a blue zinc-plated steel and stainless-steel casing with M18 thread.  Available with stroke length from 2mm to 200mm. This is series is equipped with internal signal conditioning. Available with spring return and as unguided armature.

Economy LVDT Series

Our economy series comes in a nickel-plated 20mm diameter steel casing. This series is equipped with internal signal conditioning. Available in stroke length from 2mm to 50mm. Available as spring return only.

NOTE: All LVDT sensors with internal signal conditioning come in two voltage supply options (15 VDC and 24 VDC) and two output options (4..20mA and 0..10V)

LVDT Accessories

IMA2-LVDT

Designed for top hat rail mounting, fully configured.
Available with the following specifications:
IMA2 LVDT Specifications
Further options available on request

IVM2-LVDT

Designed for PCB mounting, self-configurable, ideal for instrumentation and equipment manufacturers.
Available with the following specifications:
IVM2 LVDT Specifications

Further options available on request

IMK-LVDT (AVAILABLE SOON)

Fully enclosed electronics, integrated in a small housing including connection cable, completely configured.

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