Linear Position Sensors
Precise measurement of linear movements and displacements
Althen Linear Position Measurement Systems: Guaranteed Precision
Linear position sensors measure the distance between an object and a point of reference, as well as changes in position. They do this by converting displacement into an electrical output. A wide variety of measurement principles can be used to let you make precise and reliable measurements for a broad range of applications. Linear position sensors and measurement systems are used in industrial applications as well as in scientific laboratories.
Properties & Advantages
- High precision
- High protection class (up to IP69k)
- Resistant against environmental influences
- Long service life
- Easy to use
- Temperature stable
- Contactless measurement possible (induction sensors)
- Models with ATEX & IECEx or CSA certification available for use in demanding environments
Possible Fields of Application for Linear Position Measurement Systems
- Automation technology
- Quality control
- Testing facilities
- Mechanical engineering
- Hydraulics and Pneumatics
- Automotive industry
- Construction sector
The experts at Althen call on more than 40 years of experience to offer the perfect solution tailored to your requirements. This also includes custom position sensors and fully integrated solutions. Your advantage: We provide independent advice and do not limit you to one manufacturer. At your request, we tailor measurement systems to your specific needs. We are happy to answer any questions you might have.
Linear Position Sensors for every application: Our product portfolio
Find the perfect linear position sensor for your application. We’d be happy to help you choose.
Althen Linear Position Measurement Technology
We offer linear position measurement technology for a wide range of applications requiring travel, distance, or position measurements. Our linear position sensors include conventional inductive Schaevitz sensors and displacement sensors, but also specialized sensors that are suitable for OEM applications. Cutting-edge contactless eddy current sensors round off our portfolio.
Althen linear position sensors are based on different physical principles. This enables us to provide the ideal sensor for your application. Our linear position sensors can be divided into contacting and non-contacting position sensors.
Contacting Linear Position Sensors:
- Linear Variable Differential Transformers (LVDT sensors)
Within their specified measurement range, LVDT sensors provide excellent linearity. They are capable of detecting very small changes in position and have virtually unlimited resolution. As a result, LVDT sensors are also suitable for measuring high accelerations and high measurement cycles.
- Linear inductive position sensors
Linear inductive position sensors are durable, long-lived, and especially stable under temperature fluctuations. That means they are ideal for measuring linear travel in almost any industrial setting – especially with hydraulic or pneumatic applications.
- Draw-wire sensors
Draw-wire sensors (also called string pot displacement sensors) can measure distances at up to 0.01 mm accuracy. They measure the position and movement of an object by means of a flexible steel cable that is fed from a spring-loaded spool. The linear movement at the end of the cable is thus transformed into a rotational movement.
- Linear potentiometers
Linear-motion potentiometers (potentiometric travel sensors and displacement sensors) are based on electrical resistance. Their resistance can be altered mechanically (by rotation or transposition). These sensors are primarily used as continuously adjustable voltage dividers. Althen linear potentiometers are highly compact and lightweight, and they come in various configurations.
- Hall sensors
Sensors based on the Hall effect are used to measure the strength of magnetic fields. Their primary applications are in longevity and stress testing as well as for measuring magnetic fields or the thickness of layers. Our Hall sensors are also available in several modified versions for special requirements.
Non-Contacting Linear Position Sensors:
- Eddy current sensors
Eddy current sensors are contactless position sensors available for measurement ranges from 0.5 to 60 mm. These sensors are not influenced by media such as oil, water, or dust in the measuring gap.
- Laser triangulation sensors
Even critical surfaces such as hot metals can be measured using our contactless laser triangulation sensors. They use a laser dot to determine the travel, distance, or position of an object (laser distance sensors).
Our Linear Position Sensors in Use
Would you like to get to know our products in practice? Take a look at these interesting projects from our customers:
Laser sensors for the Hyperloop
Our Portfolio of Linear Position Measurement Systems
Inductive Position Sensors
Schaevitz inductive position sensors are typically based on the LVDT principle (Linear Variable Differential Transformer). They require a carrier frequency or CF supply and usually provide a non-amplified AC voltage signal for distance measurement. They require a CF amplifier, e.g., an MC-KS, which provides the right voltage and amplifies the signal. Current models already come with an integrated CF amplifier and provide a DC output. Available measurement ranges lie between +/-0.125 mm and +/-250 mm.
The LIPS series inductive displacement sensors are a specialized version of these sensors. They only have a single secondary coil; the non-linear signal is amplified using an ASIC. As a result, these sensors are only available with a voltage (0...5, 0...10, +/-10 V) or current (4...20mA) output.
Intrinsically Safe Position Sensors
Our LIPS series position sensors are also available in special versions for use in explosive environments.
We supply these intrinsically safe EX position sensors for Ex II 1G, Ex II 1GD, and Ex i/II M1/1GD hazard zones. These potentiometric position sensors are available in various configurations. Our portfolio includes cost-efficient OEM position sensors for serial use, robust industrial-grade position sensors, as well as vresions for displacement sensors.
Eddy Current Sensors
These contactless position sensors and position measurement systems rely on eddy currents. To measure a position, they transform the distance to a magnetizable or non-magnetizable metal surface into a proportional voltage output. Although the contactless position sensors are available for measurement ranges from 0.5 mm to 60 mm, most applications are between 1 and 6 mm. Since the area targeted by the eddy current sensor needs to be between 1.5 and 2.5 times the size of the measurement range in each direction, the target for a measurement of 60 mm would have to be at least 100 mm wide.
The ThreadChecker is a specialized version of these contactless distance sensors for detecting and identifying inside threads. This reduces losses in automated drilling, tapping, and driving processes.