Sensors > Magnetostrictive sensors
Magnetostrictive Sensors

Magnetostrictive position measurement systems come into use generally where high reliability and precision are demanded in position and speed measurement.

Over long distances, our contact-free and absolute measuring systems are suitable for all industry-standard interfaces and for a wide range of applications. Even under extreme surrounding conditions, they guarantee a high machine and system availability.

The most important benefits

  • Precise, absolute measurement without a reference run
  • Contact-free, therefore wear-free – no downtimes, long service life
  • Resistant to shock, vibration and contamination
  • Hermetically sealed housing
  • Highly dynamic control applications through synchronized measurement data
  • High durability and long service life
  • Flexible installation and handling

Product family

Linear position sensors in profile design

Maximum flexibility with installation and use

Linear position sensors in profile design

The magnetostrictive linear position sensors in a profile design from Balluff are contact-free and absolute measurement systems for precise detection of one or more positions. They deliver convincing performance in harsh environments, for example in presses, injection molding machines or gantry robots, because they are made of an hermetically sealed IP67 aluminum housing. The magnets of the position encoder act on the measurement element through the wall of the aluminum profile.

The measurement systems have flexible installation options. You can get the required position encoder in a floating or captive version. Floating position encoders are secured directly to the machine component to be measured and move along with it at a certain distance above and along the profile. The advantage here is that the guiding precision is not subject to stringent requirements. The measurement systems tolerate a horizontal and vertical offset of just a few millimeters.

The features

  • High resolution of up to 0.5 µm
  • Measuring lengths up to 7620 mm
  • Measures several positions and speeds at the same time
  • Wear-free, therefore contact-free – no downtimes, long service life
  • Easy system integration through a variety of interfaces – such as: IO-Link, Profinet, EtherCAT, SSI and analogously programmable output signals – inverting, configuring and documenting measuring range
  • Three housing variants for flexible and fast installation depending on the space requirements and application
  • Floating and captive encoders
Magnetostrictive linear position sensors in profile design
Magnetostrictive linear position sensors guarantee a high rate of efficiency and quality in the production of pre-cast concrete blocks. In a concrete block machine magnetostrictive linear position sensors simultaneously and reliably measure the axial position of applied load and form lifting movement.
Linear position sensors in rod design

Pressure-resistant measurement systems for a variety of cylinder applications

Linear position sensors in rod design

The most important application for our magnetostrictive linear position sensors in rod design is in hydraulic drive units. They are exceptionally well-suited for use in hydraulic cylinders for position feedback, for molding lines and rolling mils or for elevator and hoisting technology.

Because the sensors are installed in the pressure area of hydraulic cylinders, they have to have the same pressure resistance as the cylinder itself. The measurement element is installed in a pressure-tight tube made of non-magnetic stainless steel. The flange seals the high pressure area using an O-ring. The electronics are integrated in a protective housing outside of the cylinder on the flange of the rod.

The features

  • High resolution of up to 1 µm
  • Measuring lengths up to 7620 mm
  • Measures several positions and speeds at the same time
  • Programmable output signals – invert, configure and document the measuring range
  • Flexible assembly with various thread types
  • Contact-free, therefore wear-free – no downtimes, long service life
  • Expanded measuring possibilities with multi-magnet technology
  • Easy system integration via a range of interfaces – e.g. IO-Link, Profinet, EtherCAT, SSI and analog
Magnetostrictive linear position sensors in rod design
The BTL Compact integrated in the hydraulic cylinder of a hydraulically actuated servo drive guarantees safe, reliable and perfect control of the flow.
Robust linear position sensors

Cylinder feedback systems for the toughest environmental conditions

Robust linear position sensors

Whenever you need to measure with absolute precision, you can count on the linear position sensors from Balluff. Our systems are made completely of stainless steel and are designed up to IP69K or for high pressure cylinder applications up to 1000 bar. Their contact-free working principle prevents wear and ensures almost unlimited service life. Therefore, Balluff offers you a high degree of reliability and precision, even under the most extreme conditions.

The features

  • Rugged stainless steel housing
  • Resistant to shocks and vibration
  • Robust stainless steel housing with an IP69K rating
  • Temperature range of –40 to +85 °C
  • Pressure-resistant to 1000 bar
  • Resolution of up to 1 µm
  • Measurement lengths up to 7620 mm
  • Long service life thanks to wear-free and contactless measurement method
Robust linear position sensors
Robust linear position sensors correctly signal the piston position and enable a smooth drilling operation.
Redundant linear position sensors

Maximum system availability and safety, even in harsh environments

Redundant linear position sensors

Our multiple redundant position measurement systems meet the highest requirements for security and availability, even in harsh environments. For example, when used in safety-relevant valves and hydraulic cylinders. They offer up to three independent measurement systems in the same housing and thereby ensure increased safety during operation. The different interfaces enable diverse redundancy.

The features

  • Double- or triple-redundancy design
  • Temperature range of –40 to +85 °C
  • Analogue and digital interfaces
  • Flexibly adjustable measuring range and signal inversion via software
  • Settings can be copied to all three measurement channels
  • Durable thanks to robust mechanical construction
  • Contactless, wear-free
Redundant linear position sensors
These redundant linear position sensors offer the ideal solution for fail-safe position measurement – for example, on safety valves or for independent position and adjustment speed monitoring.
Linear position sensors for explosive atmospheres

Pressure encapsulated linear position sensors for all ex-zones

Linear position sensors for explosive atmospheres

Many applications require the use of transducers in explosive atmospheres. Pressure-encapsulated magnetostrictive linear position sensors are available in different rod designs and with varying performance profiles for use in Ex-zones 0 and 1. There are variants for use in areas where there is a risk relating to gas or dust as well as magnetostrictive linear position sensors for Ex-zone 2 that can withstand the potentially explosive conditions there.

The housing of the BTL-J-DEXC-TA12 is robust and pressure-encapsulated, and its electronics module can be changed quickly and easily. This means that these variants meet the requirements set by the oil and gas industries for high reliability and easy service for the Ex-zone.

The features

  • Suitable for zones 0, 1 and 2
  • Measurement ranges up to 7620 mm
  • Absolute output signal with high resolution of up to 5 µm
  • Pressure rated to 600 bar
  • Range of interfaces available
  • Space-saving housing
  • Fast commissioning through characteristic curve adjustment
  • Many international certifications, such as IECEx, ATEX and CSA
Linear position sensors for explosive atmospheres
Isolation and control valves used in oil and gas extraction, in refineries and in petrochemical plants.
Fill level sensors

High-precision fill level measurement for maximum hygiene standards and excellent filling results

Fill level sensors

The BTL-SF fill level probe enables continuously precise measurements in applications that demand an exceptionally high level of hygiene. Made from non-corrosive stainless steel, with high surface quality and rounded edges, this measuring system meets the highest international hygiene standards and thus fulfils all prerequisites of the strict regulations relevant to the food industry.

The features

  • Stainless steel for unbeatable hygiene standards and a long service life
  • Safe for sterilization (SIP) and cleaning (CIP)
  • Continuous precise measurement in the μm range for excellent filling results
  • Reliable fill level values thanks to foam compensation system
  • International certificates such as 3-A Sanitary Standard, FDA and EHEDG
  • Tri-clamp mounting
  • Contactless and therefore wear-free
Fill level sensors
The BTL-SF fill level probe enables continuously precise measurements in applications that demand an exceptionally high level of hygiene. It is made of stainless steel with a great surface finish and rounded edges.