Linear Sensors

Things to know about displacement sensors

Guide for Linear Sensors

Linear Sensors

Linear potentiometers, magnetical and optical linear transducers and measuring probes

Our displacement sensors have an optimal focus on space-saving, robustness and precision. With our linear sensors you can measure mechanical measuring distances up to 4000 mm. A wide selection of mechanical and electrical interfaces allows the best possible constructive and electrical integration into your application.

We cover high demands in protection class, EMC, shock, hydraulic pressure (up to 350 bar), accuracy (up to 1 µm) and measuring dynamics (up to 10 m/s @ max. 100 m/s²). Applications with an operating temperature range up to 600°C can also be realized.

Each measuring principle has its own advantages, which we will determine with you during our consultation. Only the requirements of the application determine the choice of the suitable displacement transducer. In many cases, demanding applications require technical product adaptation. MEGATRON is your specialist for this adaptation process - even for small quantities.


35 results found
Potentiometric Linear Transducer MM10
Potentiometric Linear Transducer MM10
Linear transducer in miniature design with rear and front guided push rod for 8 mm to 15 mm strokes
  • Linear potentiometer with almost infinite resolution
  • Space-saving mini design
  • Measuring lengths from 8 mm to 15 mm
  • Rear and front guided push rod
  • Long lifetime
Potentiometric Linear Transducer RC13
Potentiometric Linear Transducer Series RC13
Displacement sensor in robust and compact design with protection class IP60 and front guided push rod in three mounting variants for 25 to 250 mm strokes
  • Compact displacement sensor
  • For harsh environmental conditions - protection class IP60
  • Mounting by ball joints, mounting brackets or flange
  • Long lifetime and accuracy
  • Measuring lengths from 25 mm to 300 mm
Potentiometric Linear Transducer CLP13
Potentiometric Linear Transducer CLP13
Displacement sensor in space-saving design and front guided push rod for 13 to 100 mm strokes
  • Linear potentiometer with almost infinite resolution
  • Space-saving compact design
  • Measuring lengths from 13 mm to 100 mm
  • Also available with spring return probe
  • Long lifetime
Potentiometric Linear Transducer RC20
Potentiometric Linear Transducer Series RC20
Displacement sensor in robust design IP60/IP67 and front guided push rod in three mounting variants in measuring lengths 10 to 300 mm
  • For harsh environmental conditions - protection class up to IP67
  • Mounting by ball joints, mounting brackets or flange
  • Long life span and high accuracy
  • Measuring lengths from 10 mm to 300 mm
Potentiometric Linear Transducer MM
Potentiometric Linear Transducer MM
Very compact linear transducer with rear and front guided push rod and pilot ring for 10 to 30 mm strokes
  • Space saving due to small dimensions
  • Long lifespan and high accuracy
  • Measuring lengths from 10 mm to 30 mm
  • Rear and front guided push rod
  • Two M3 threads and 10 mm flange diameter for easy integration
Potentiometric Linear Transducer CLP21
Potentiometric Linear Transducer Series CLP21
Compact and robust displacement sensor with front guided push rod in measuring lengths 15..100 mm
  • Compact and robust design
  • With front guided push rod
  • Available as a probe
  • Measuring lengths from 25 mm to 100 mm
  • Long lifetime and high accuracy
Potentiometric Linear Transducer SPR18
Potentiometric Linear Transducer Series SPR18
Displacement sensor in compact industrial design with spring-suspended probe tip for 25 to 100 mm strokes
  • Compact industrial design
  • With spring-suspended probe tip
  • Long lifetime and high accuracy
  • Linear potentiometer with almost infinite resolution
  • Measuring lengths from 25 mm to 100 mm
Potentiometric Linear Transducer SPI18
Potentiometric Linear Transducer SPI18
Displacement sensor in compact industrial design with front guided push rod and ball joint for 25 to 200 mm strokes
  • In a compact industrial design
  • Front guided push rod and ball joints
  • Long lifespan and accuracy
  • Linear potentiometer with almost infinite resolution
  • Measuring lengths from 25 mm to 200 mm
Potentiometric Linear Transducer RC35
Potentiometric Linear Transducer Series RC35
Displacement sensor in very robust design with protection class up to IP67, ball joints and front guided push rod for 50 to 750 mm
  • For harsh environmental conditions up to IP67
  • Coupling with ball joints
  • Very long lifetime and very high accuracy
  • Measuring lengths from 50 mm to 750 mm
Potentiometric Linear Transducer REM13
Potentiometric Linear Transducer REM13
Compact displacement sensor in space-saving design for 20 bar operating pressure in protection class IP67 for 50 mm to 1000 mm
  • Space-saving and compact construction
  • With external magnetic cursor
  • High degree of protection IP67 and operating pressure up to 20 bar
  • Measuring lengths from 50 to 1000 mm
  • With cable or plug
  • Cursor with or without ball joint
Potentiometric Linear Transducer MBX
Potentiometric linear transducer MBX
Extremely flat linear transducer with only 7 mm height and universal cursor ideal for tight space for 50 to 200 mm strokes
  • Minimum height only < 7 mm
  • Easy mounting
  • Flexible mechanical coupling due to universal cursor
  • No push rod necessary
Linear sensor MBH
Potentiometric linear transducer MBH
Potentiometric linear transducer in open and flat design with a space saving slider construction for 100 mm strokes. Waterproof sensor-foil element
  • Hermetically encapsulated sensor element
  • Sealed round cable outlet
  • Saves space by flat construction and by slider coupling
  • Integrated end stops
  • 3 million sliding movements
Potentiometric Linear Transducer CFL
Potentiometric linear position sensor CFL
Very precise displacement sensors in open design with long lifespan in measuring lengths 100..1000 mm
Potentiometric Linear Transducer CD18
Potentiometric linear position sensor CD18
Potentiometric position transducer CD18 with rear and front guided push rod and pilot ring in measuring lengths of 25..150 mm
Potentiometric Linear Transducer CH37
Potentiometric linear position sensor CH37
Linear position sensor CH37 for use in hydraulic cylinders with up to 340 bar for 100 to 550 mm strokes
  • Internal or external flange design
  • Space saving design
  • Independent linearity ±0.1 %
  • Conductive plastic with almost infinite resolution
  • Measuring lengths from 50 mm to 550 mm
  • Long life span (100 million movements)
Potentiometric Linear Transducer CR18
Potentiometric Linear Transducer CR18
Displacement sensor in compact industrial design with spring-suspended probe tip or tip with roller bearing for 10 to 100 mm strokes
  • Compact industrial design
  • With spring-suspended probe tip or tip with roller bearing
  • Long lifespan and high accuracy
  • Linear potentiometer with almost infinite resolution
  • Measuring lengths from 10 mm to 100 mm
Potentiometric Linear Transducer HEM12
Potentiometric Linear Transducer Series HEM12
Displacement sensor for hydraulic applications up to 250 bar and IP67 protection for 50 to 1000 mm strokes
  • High degree of protection IP67 and max. 250 bar operating pressure
  • With external magnetic cursor - capsule of the sensor element
  • Mounting via internal or external flange
  • Measuring lengths from 50 mm to 1000 mm
  • Long lifetime (up to 100 million movements)
Potentiometric Linear Transducer HEM12
Potentiometric Linear Sensor Series HEM12E with Electronics
Displacement sensor with integrated signal-converter for hydraulic applications up to 250 bar and IP67 protection for 50 to 1000 mm strokes
  • With integrated signal-converter
  • High degree of protection IP67 and max. 250 bar operating pressure
  • With external magnetic drag - capsule of the sensor element
  • Mounting via internal or external flange
  • Measuring lengths from 50 mm to 1000 mm
  • Long lifetime (up to 100 million movements)
Potentiometric Linear Transducer HEM16
Potentiometric Linear Transducer HEM16
Very accurate displacement sensor for hydraulic applications up to 250 bar with protection IP67 for 50 to 1000 mm strokes
  • High accuracy due to very good linearity
  • For hydraulic applications up to 250 bar (peak 400 bar)
  • With external cursor - encapsulation of the sensor element
  • Mounting via internal or external flange
  • Measuring strokes from 50 mm to 1000 mm
  • Long lifespan (up to 100 million axis movements)
Potentiometric Linear Transducer MMS33
Potentiometric Linear Transducer MMS33
Front guided push rod displacement sensor in rugged design up to IP67 and length from 50 to 900 mm for applications with strong vibrations
  • Robust design in protection class up to IP67
  • Measuring lengths from 50 to 900 mm
  • With front guided push rod
  • Simple coupling with ball joints (not included)
  • For applications with strong vibrations
Potentiometric Linear Transducer MSL38
Potentiometric Linear Transducer Series MSL38
Displacement sensor for measuring distances from 100 mm to 2000 mm with space-saving cursor for industrial environments
  • Space saving cursor construction
  • Easy coupling by link ball on cursor
  • Measuring lengths from 100 mm to 2000 mm
  • Long lifetime (up to 100 million movements)
Potentiometric oilfilled Linear Transducer WGO20
Potentiometric oil filled linear position sensor WGO20
Potentiometric linear position sensor with oil filling in measuring length 50..200 mm for use in difficult environmental conditions
Potentiometric oilfilled Linear Transducer WGO40
Potentiometric oil filled linear position sensor WGO40
Potentiometric linear position sensor with oil filling in measuring length 100..500 mm for use in difficult environmental conditions
Magnetical Linear Transducer OMS2
Magnetic (magnetostrictive) Linear Transducer OMS2
EMC resistant analog high-resolution displacement sensor for 50 to 1500 mm measuring strokes in flat design and protection class IP67
  • Measurement from 50..1500 mm
  • Wear-free measuring principle and absolute analogue signal
  • Direct and inverse analog output
  • For harsh conditions IP67
  • Very flat construction with only 14 mm
  • High precision due to high resolution and good linearity
  • Electromagnetic compatibility 2014/30/EU (EMC)
Magnetical Linear Transducer HMA2
Magnetic position sensor HMA2
Very precise magnetic position sensor with measuring strokes from 50..4000 mm is designed for hydraulic applications with up to 350 bar
  • Measuring strokes from 50 mm to 4000 mm
  • High IP protection class IP67 and 350 bar operating pressure (peak pressure max. 500 bar)
  • Made of stainless steel AISI 316
  • With external cursor
  • Mounting via external flange (metric / inch)
  • Electromagnetic compliance EMC 2014/30/EU
  • RoHS 2011/65/EU
Magnetical Linear Transducer PMS2
Magnetic Linear Transducer PMS2
Magnetic displacement sensor without push rod with very high accuracy in IP67 for measuring strokes from 50 to 4000 mm
  • Mech. connection by ball coupling to compensate for the angular offset or free position sensor
  • Small space requirement without push rod
  • Measuring lengths from 50 mm to 4000 mm
  • Very precise due to high resolution and good linearity
  • Electromagnetic compatibility 2014/30 /EU (EMC)
Magnetical Linear Transducer IMS
Magnetic Linear Transducer IMS
Absolute linear transducer with very high accuracy, protection class IP67 and max. 500 bar peak for 50 to 4000 mm strokes
  • Very accurate measuring principle up to 4000 mm
  • Suitable for applications up to 500 bar peak
  • For heavy duty applications IP67
  • Absolute true power on signal
Inductive LVDT Linear Transducer EVT
Inductive Linear Transducer EVT
Robust miniature displacement sensor for small measuring strokes from 1.3 to 25 mm in difficult environmental conditions max. IP68/pressure-tight up to 30 bar
  • For difficult environmental conditions (max IP68 / 30bar)
  • Miniature design max. Ø9.5 mm
  • Very accurate measuring principle for small measuring strokes
  • Measuring strokes from ±0.65 to ±12.5 mm
  • Very long lifespan
  • Suitable for high dynamics
  • On request for temperature ranges up to 600°C
Inductive LVDT Linear Transducer EDC
Inductive Linear Transducer EDC
Compact LVDT displacement sensor with integrated electronics in two designs for small measuring strokes from 2 mm to 50 mm
  • Very accurate for small measuring strokes (2..50 mm)
  • In 2 designs (probe or loose core)
  • For harsh environmental conditions (up to IP67)
  • Very long lifespan
  • Suitable for high dynamics
  • Absolute analog signal
Inductive LVDT Linear Transducer MDC
Inductive Linear Transducer MDC
Robust and compact LVDT displacement sensor with integrated electronics in three designs and measuring length 2 mm to 200 mm
  • Very accurate measuring principle
  • For harsh environmental conditions (up to IP68)
  • Very long lifespan
  • Suitable for high dynamics
  • Absolute analog signal
Inductive LVDT Linear Transducer MAC
Inductive Linear Transducer MAC
Robust and compact LVDT displacement sensor in three designs and measuring lengths from 2 to 200 mm
  • Very accurate for small measuring strokes (2..200 mm)
  • In 3 designs (ball joints, probe, loose core)
  • For harsh environmental conditions (up to IP68)
  • Very long lifespan
  • Suitable for high dynamics
Inductive LVDT Linear Transducer RAC
Inductive displacement sensor RAC
Robust LVDT displacement sensor with AC voltage output in three designs with a wide temperature range and measuring lengths from 25 mm to 940 mm
  • In 3 designs (probe, guided push rod or loose core)
  • Wide temperature range -50°..125° C
  • Very long lifespan due to wear-free measuring principle
  • Suitable for high dynamics and oscillating movements
  • AC voltage
Optical Linear Transducer MSO
Incremental Linear Transducer MSO
Incremental linear transducer with high resolution up to 1 µm and output channels A, B for 12 to 50 mm strokes
  • High resolution up to 1 µm
  • Output channels A, B
  • Linedriver, Open Collector or TTL
  • High quality ball cage bearing
  • Easy mounting on shaft 8h6mm
  • Temperaturestable counting pulses because of glass scale
Optical Linear Transducer MSV
Incremental Linear Transducer MSV
Incremental linear transducer with TTL or Line Driver output in high resolution up to 5µm for 30 to 50 mm strokes
  • High resolution up to 5µm
  • For 30 mm or 50 mm stroke
  • accurate sleeve bearing
  • Easy mounting on shaft  8h6mm
  • Temperature stable counting pulses because of  glas scale
Magnetical Linear Transducer LHK
Contactless Hall-Effect Linear Transducer Series LHK
Magnetic linear transducer for 30 mm strokes is optimal for the detection of small, oscillating movements in automatically regulated systems
  • Long lifespan >100 million movements
  • No wear-induced degradation of signal quality
  • Reliable measurement even at vibration
  • Resolution: 12 bit
  • Analog output: 0,5..4,5 V 
  • Enables wire break detection and short-circuit detection
  • Supply voltage: 5 V
Guide for Linear Sensors
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Measuring principle of linear sensors

The task of displacement sensors is to convert linear movements into electrical signals. To do this, a push rod or a guided or loose actuator is used to mechanically move along the travel distance in a linear manner. 
In the displacement transducer, the mechanical measuring path is electrically detected via a sensor element (electrical measuring path) and converted into electrical signals. The electrical signal acquisition depends on the measuring principle or sensor technology. The acquired signals are either transferred as analogue signals directly to a transducer for further processing or via an internal signal conditioning (measuring amplifier / transducer).
These signals represent the recorded measuring path. Displacement measuring systems are used in all areas of industry and medical technology. Just where linear mechanical movements are converted into electrical signals for further processing of control tasks, distance measurements and position detection.


Linear sensor technologies

For linear displacement measurement, linear sensors are available in five different measuring principles:


Potentiometric

A linear potentiometer is a passive component whose resistance value can be continuously adjusted. The wiper is guided over the resistance track, which outputs the resistance value depending on its position. The linear potentiometer has three connections for this purpose: two for the resistor and one for the pickup.
Application example: injection moulding machine, pneumatics, simple presses

  • Simple sensor principle mostly without electronics
  • Measured value is available immediately
  • Resolution almost infinite
  • Reasonably priced and very many differentiated designs
  • Works with low voltages (hardly any power consumption)
  • But works with wear
  • Sensory characteristics change in the course of operation

 

Magnetostrictive

The sensor consists of a robust housing, a waveguide inside, a permanent magnet that deflects the generated pulses and a converter that converts the returning vibrations into an electrical signal. As a result, the position of the magnet is determined by means of magnetostriction.
Application example: injection moulding machine, hydraulic cylinders, presses, tank level measurement, rolling mills.

  • Sealed sensor (high IP protection) with electronics
  • Contactless measuring principle
  • Maintenance- and wear-free
  • Durable, consistent accuracy
  • Long measuring distances up to 4000 mm
  • Insensitive to shock and vibration
  • Withstands high pressures - ideal for hydraulically moved axes
  • Insensitive to various chemical media
  • But sensitive to magnetic interference fields

Inductive (LVDT)

The LVDT is an analog sensor in which a coil system operates - consisting of a primary coil and two secondary coils. These coils convert the linear motion into electrical signals.
Application example: probes, quality monitoring, manufacturing automation, food production

  • Sealed sensor (high IP protection) with or without electronics
  • With very good linearity
  • Recording of small measurement changes
  • Resolution almost infinite
  • Durable, consistent accuracy
  • Maintenance- and wear-free
  • Suitable for high dynamics
  • Zero point is reproducible
  • Signal output absolute
  • Insensitive to many chemical media
  • But sensitive to magnetic interference fields

Hall effect

Hall sensors use a permanent magnet placed on a moving plunger. One or more Hall ICs are located on the travel path. They measure the field strength on the path and identify the position of the magnet and thus the distance of the measuring path.
Application example: Position detection in elevators or hinges, where space is limited

  • Contactless measuring principle
  • Maintenance- and wear-free
  • Durable, consistent accuracy
  • Reliable measurement even with vibration
  • Detection of wire breaks and short circuits
  • But sensitive to magnetic interference fields

Optoelectronic

At the end of the push rod there is a glass scale. The transmitter and receiver are arranged opposite to each other. The glass scale moves between them. Electrical impulses are converted into light pulses by the transmitter and into electrical signals by the receiver. This way a glass scale linear encoder is implemented and is the principle of this kind of sensor. The downstream amplifier compares the received signal with a predetermined switching wave. With our optical probes exact positions can be detected.
Application example: Probes, quality monitoring, dial gauges, precision engineering

  • Precise sensor with electronics
  • Contactless measuring principle
  • Maintenance- and wear-free
  • Durable, consistent accuracy
  • Very high resolution
  • Temperature stable
  • Easy mounting
  • Insensitive to magnetic interference fields
  • But the glass scale is fragile

Technology comparison

Measurement method / Technical requirements Potentiometric LVDT Magnetostrictive Hall effect Optoelectronic
High resolution (100 μm) + + + + +
Very high resolution (1 μm) - - + + +
Operating speed 0 0 + + -
Small shape + 0 0 + -
High protection class (IP65) 0 0 + + 0
Use in magnetic field + - 0 - +
Very small measuring distances (±1 mm) - + - 0 -
Digital processing required - - - - +
Lateral forces occur (transverse) 0 0 0 - -
High measuring rate/strongly oscillating movements 0 + + + +

Electrical interfaces and signals

To serve a variety of applications in different industries, we offer displacement sensors with corresponding electrical interfaces.

Potentiometric and inductive
Our potentiometric and inductive linear sensors have also been realized with integrated electronics to simplify electronic integration. This allows direct connection to the typical analog signals 0..5 V / ±5 V / 0..10 V / ±10 V / 0..20 mA / 4..20 mA without external amplifier.

Hall effect
Our contactless Hall sensors have an analog output with 0.5..4.5 V. This enables wire break and short circuit detection.

Magnetostrictive
In the magnetostrictive displacement encoder the signal processing after the travel time measurement is always integrated. The electrical connection is made via 5, 6 or 8-pin plugs with M12 or M16 screw threads. Some sensors have a potted cable with a length of one meter (standard) or on request up to 15 m.
In addition, these sensors offer analog outputs in voltage or current for direct measurement of displacement and speed or digital outputs.

Optoelectronic
The incremental displacement measurement outputs the counting pulses in TTL, OC or LD level.


Mechanical interfaces

Guided push rod with mechanical interfaces

  • With spring return as probe
  • With ball joints - ideal for compensation of lateral misalignment
  • With threaded coupling (with or without return spring)

Loose push rod

  • Only for LVDT sensors - with threaded coupling - the application requires an appropriately matched interface. Core extensions from 50 mm to 315 mm optionally available

Guided carriage (actuator/cursor)

  • Carriage is mechanically or magnetically connected to the displacement sensor, the application requires a correspondingly matched interface

Loose carriage (actuator/cursor)

  • The carriage is moved at a defined distance above the surface of the displacement sensor, the application requires a correspondingly adapted interface

There are two types of mechanical integration of push rods in the displacement sensor:

  • The push rod is guided on both sides. This means that the push rod "projects" horizontally in both directions of the sensor housing. This offers greater robustness with miniaturized displacement sensors, because the push rod is securely guided linearly in both slide bearings. In addition, there is no need for elaborate bearing arrangements.
  • The push rod is guided on one side. This means that the push rod only protrudes on the measuring side. Bearings inside the housing give the connecting rod its stability.

Mounting

We have a wide range of accessories for installation - depending on product and application. Many accessories are already enclosed with the sensor. Please also note our information on the product data sheets.

As a general rule: Each sensor requires a clean and even support surface. For longer measuring distances, additional support should be considered to prevent deflection. Please do not apply any mechanical stress to the sensor housing.

Many sensors are already supplied with fixing clamps. Some have mounting blocks, flanges or ball joints.

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