Linear transducers and LVDT probes

Il inductive displacement transducer, Also known as LVDT, is an electromagnetic device used for the measurement of small displacements. The LVDT transducer has high precision and repeatability even in difficult working conditions and in the presence of contaminants.

Position and displacement transducers are robust and reliable, they ensure a long operating life. They offer measuring ranges between 0,2 and 10 mm. Economical, miniaturized, pressurized versions are available, with spring feeler, with or without incorporated electronics.

The transducer is made by means of a tube composed of three windings arranged with parallel axes and with a movable ferromagnetic cylindrical core inside. The central winding is called primary and the other two secondary: the primary one is connected to an AC voltage generator, the output voltage is measured at the ends of the secondary ones.

When the core is in the center, the voltage induced on the secondary windings, since these windings are wound in a discordant direction, is equal but opposite, so that the measured voltage signal is practically zero. As the core moves, however, the mutual inductances change, and depending on whether it moves to the left or to the right, the inductive coupling with the secondary respectively on the left or right will be greater. Consequently, the output signal will vary proportionally to the displacement of the core.

So-called is used to translate the LVDT output signal phase discriminating demodulators. These are electronic devices that allow you to extract the rms value of the voltage representing the displacement, and to interpret from which part of zero the displacement occurs. The best known of all uses a double Graetz bridge which rectifies the alternating signal coming from the secondary windings and makes the algebraic sum. Depending on the sign of the sum, it is possible to understand from which side of the zero the shift occurred.

LVDT is a very sensitive transducer capable of measuring displacements in the order of micrometer fractions. Depending on the power supply frequency of the primary and the mass of the core, there are cut-off frequencies of a few hundred hertz and therefore good dynamic responses to fast movements that vary over time.

CATALOGUE

GT21 series LVDT transducers

  • Stroke of the rod 4,3 mm
  • Fixing stem Ø 8 mm with the possibility of clamping along its entire length
  • Measuring rod mounted on ball bearing
  • Guide on ball bearing separate from the fixing shank in order not to negatively influence the movement of the measuring rod in case of inadequate tightening of the probe
  • Degree of protection IP65 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request 

CodeModelDescriptionDocumentation
15-07-95
GT21-0.63N
LVDT probe 03210904 GT21 - 0.63 NProduct details
15-07-96GT21-1.00NLVDT probe 03210905 GT21 - 1.00 NProduct details
15-07-97GT21-1.60NLVDT probe 03210906 GT21 - 1.60 NProduct details
15-07-98GT21-2.50NLVDT probe 03210907 GT21 - 2.50 NProduct details
15-07-99GT21-4.00NLVDT probe 03210908 GT21 - 4.00 NProduct details

GT22 series LVDT transducers

  • Stroke of the rod 4,3 mm
  • Fixing stem Ø 8 mm with the possibility of clamping along its entire length
  • Measuring rod mounted on ball bearing
  • Guide on ball bearing separate from the fixing shank in order not to negatively influence the movement of the measuring rod in case of inadequate tightening of the probe
  • Degree of protection IP65 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request 
CodeModelDescriptionDocumentation
15-08-00
GT22-0.63N
LVDT probe 03210904 GT22 - 0.63 NProduct details
15-08-01GT22-0.16NLVDT probe 03210905 GT22 - 0.16 NProduct details
15-08-02GT22-0.25NLVDT probe 03210906 GT22 - 0.25 NProduct details
15-08-03GT22-0.40NLVDT probe 03210907 GT22 - 0.40 NProduct details
15-08-04GT22-1.00NLVDT probe 03210908 GT22 - 1.00 NProduct details
15-08-05GT22-1.60NLVDT probe 03210904 GT22 - 1.60 NProduct details
15-08-06GT22-2.50NLVDT probe 03210904 GT22 - 2.50 NProduct details
15-08-07GT22-4.00NLVDT probe 03210904 GT22 - 4.00 NProduct details

GTD21 series LVDT transducers

  • Stroke of the rod 4,3 mm
  • Fixing stem Ø 8 mm with the possibility of clamping along its entire length
  • Measuring rod mounted on ball bearing
  • Guide on ball bearing separate from the fixing shank in order not to negatively influence the movement of the measuring rod in case of inadequate tightening of the probe
  • Degree of protection IP65 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request 
CodeModelDescriptionDocumentation
15-08-08
GTL21
LVDT 03230057 GTL21 probeProduct details

GTD211 series LVDT transducers

  • Stroke of the rod 4,3 mm
  • Fixing stem Ø 8 mm with the possibility of clamping along its entire length
  • Measuring rod mounted on ball bearing
  • Guide on ball bearing separate from the fixing shank in order not to negatively influence the movement of the measuring rod in case of inadequate tightening of the probe
  • Degree of protection IP65 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request 
CodeModelDescriptionDocumentation
15-08-09
GTL211
LVDT 03230072 GTL211 probeProduct details

GTD22 series LVDT transducers

  • Stroke of the rod 4,3 mm
  • Fixing stem Ø 8 mm with the possibility of clamping along its entire length
  • Measuring rod mounted on ball bearing
  • Guide on ball bearing separate from the fixing shank in order not to negatively influence the movement of the measuring rod in case of inadequate tightening of the probe
  • Degree of protection IP65 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request 
CodeModelDescriptionDocumentation
15-08-10
GTL22
LVDT 03230056 GTL22 probeProduct details

GT27 series LVDT transducers

  • Universal probes for classic applications, especially with multi-quota devices.
  • Long lifting stroke for greater protection of the probes 
  • Stroke of the rod 10,3 mm
  • Degree of protection IP65 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request  
CodeModelDescriptionDocumentation
15-08-11
GT27
LVDT 03230027 GT27 probeProduct details

GT271 series LVDT transducers

  • Universal probes for classic applications, especially with multi-quota devices.
  • Long lifting stroke for greater protection of the probes 
  • Stroke of the rod 10,3 mm
  • Degree of protection IP65 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request  
CodeModelDescriptionDocumentation
15-08-12
GT271
LVDT 03230073 GT271 probeProduct details

GT28 series LVDT transducers

  • Universal probes for classic applications, especially with multi-quota devices.
  • Long lifting stroke for greater protection of the probes 
  • Stroke of the rod 10,3 mm
  • Degree of protection IP65 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request  
CodeModelDescriptionDocumentation
15-08-13
GT28
LVDT 03230026 GT28 probeProduct details

GT21HP series LVDT transducers

  • Universal probes for classic applications and intense use.
  • High precision probe suitable for the measurement of gauge blocks
  • Stroke of the rod 4,3 mm
  • Fixing stem Ø 8 mm with the possibility of clamping along its entire length
  • Measuring rod mounted on ball bearing
  • Guide on ball bearing very precise, separated from the fixing shank in order not to negatively influence the movement of the measuring rod in case of inadequate tightening of the probe
  • Degree of protection IP64 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request   
CodeModelDescriptionDocumentation
15-08-14
GT21HP
LVDT 03230036 GT21HP probeProduct details

GT22HP series LVDT transducers

  • Universal probes for classic applications and intense use.
  • High precision probe suitable for the measurement of gauge blocks
  • Stroke of the rod 4,3 mm
  • Fixing stem Ø 8 mm with the possibility of clamping along its entire length
  • Measuring rod mounted on ball bearing
  • Guide on ball bearing very precise, separated from the fixing shank in order not to negatively influence the movement of the measuring rod in case of inadequate tightening of the probe
  • Degree of protection IP64 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request   
CodeModelDescriptionDocumentation
15-08-15
GT22HP
LVDT 03230021 GT22HP probeProduct details

GTD212 series LVDT transducers

  • Probes intended for use with devices that integrate fully or semi-automated measurement sequences.
  • Stroke of the rod 3,2 mm, linearized
  • Fixing stem Ø 8 mm with the possibility of clamping along its entire length
  • Measuring rod mounted on ball bearing
  • Guide on ball bearing separate from the fixing shank in order not to negatively influence the movement of the measuring rod in case of inadequate tightening of the probe
  • Degree of protection IP65 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request 
CodeModelDescriptionDocumentation
15-08-16
GTL212
LVDT 03230060 GTL212 probeProduct details

GTD222 series LVDT transducers

  • Probes intended for use with devices that integrate fully or semi-automated measurement sequences.
  • Stroke of the rod 3,2 mm, linearized
  • Fixing stem Ø 8 mm with the possibility of clamping along its entire length
  • Measuring rod mounted on ball bearing
  • Guide on ball bearing separate from the fixing shank in order not to negatively influence the movement of the measuring rod in case of inadequate tightening of the probe
  • Degree of protection IP65 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request 
CodeModelDescriptionDocumentation
15-08-17
GTL222
LVDT 03230054 GTL222 probeProduct details

LVDT transducers GTL212A series

  • Probes intended for use with devices that integrate fully or semi-automated measurement sequences.
  • Stroke of the rod 3,2 mm, linearized
  • Fixing stem Ø 8 mm with the possibility of clamping along its entire length
  • Measuring rod mounted on ball bearing
  • Guide on ball bearing separate from the fixing shank in order not to negatively influence the movement of the measuring rod in case of inadequate tightening of the probe
  • Degree of protection IP65 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request 
CodeModelDescriptionDocumentation
15-08-18
GTL212-A
LVDT 03230067 GTL212-A probeProduct details

LVDT transducers GTL222A series

  • Probes intended for use with devices that integrate fully or semi-automated measurement sequences.
  • Stroke of the rod 3,2 mm, linearized
  • Fixing stem Ø 8 mm with the possibility of clamping along its entire length
  • Measuring rod mounted on ball bearing
  • Guide on ball bearing separate from the fixing shank in order not to negatively influence the movement of the measuring rod in case of inadequate tightening of the probe
  • Degree of protection IP65 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request 
CodeModelDescriptionDocumentation
15-08-19
GTL222-A
LVDT 03230063 GTL222-A probeProduct details

GTD272 series LVDT transducers

  • Probes intended for use with devices that integrate fully or semi-automated measurement sequences. 
  • Stroke of the rod 10,3 mm, long lifting stroke 
  • Fixing stem Ø 8 mm with the possibility of clamping along its entire length
  • Measuring rod mounted on ball bearing
  • Guide on ball bearing separate from the fixing shank in order not to negatively influence the movement of the measuring rod in case of inadequate tightening of the probe
  • Degree of protection IP65 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request 
CodeModelDescriptionDocumentation
15-08-20
GTL272
LVDT 03230061 GTL272 probeProduct details

GTD282 series LVDT transducers

  • Probes intended for use with devices that integrate fully or semi-automated measurement sequences. 
  • Stroke of the rod 10,3 mm, long lifting stroke 
  • Fixing stem Ø 8 mm with the possibility of clamping along its entire length
  • Measuring rod mounted on ball bearing
  • Guide on ball bearing separate from the fixing shank in order not to negatively influence the movement of the measuring rod in case of inadequate tightening of the probe
  • Degree of protection IP65 according to CEI 60529
  • LVDT executions and compatible with electronic instruments of other brands available on request 
CodeModelDescriptionDocumentation
15-08-21
GTL282
LVDT 03230053 GTL282 probeProduct details

LVDT transducers GTL272A series

LVDT transducers GTL282A series

GT41 series LVDT transducers

GT42 series LVDT transducers

GT43 series LVDT transducers

GT44 series LVDT transducers

GT31 series LVDT transducers

LVDT transducers FMS100 series

LVDT transducers FMS102 series

LVDT transducers FMS130 series

LVDT transducers FMS132 series

LVDT transducers FMS100-P series

LVDT transducers FMS102-P series

LVDT transducers FMS130-P series

LVDT transducers FMS132-P series

TECHNICAL IN-DEPTH

Typical qualities of RODER inductive probes: excellent repeatability, durability and longevity • All RODER axially moving inductive probes are mounted on a ball bearing, with the exception of miniature models. • The ball bearing guide guarantees very low sensitivity to radial forces exerted on the measuring rod. An anti-rotation roller improves the movement of the mechanical guide. • The axial probe guides are highly protected against the penetration of liquids (oils) or solids (dust) by a high-quality elastomer protective bellows. • The measuring contacts can be replaced or changed. A wide range is available with different geometry, shape and size. • The measuring force can be adapted by changing the spring according to the probe type.

Axial movement RODER probes Standard execution Universal probes for classic applications and intense use. - Ø 8 mm fixing shank with the possibility of tightening over its entire length. - Measuring rod mounted on ball bearing. - Guide on ball bearing separate from the fixing shank in order not to negatively influence the movement of the measuring rod in case of inadequate tightening of the probe. - Degree of protection IP65 according to CEI 60529. - Wide range of accessories: measuring contacts, set of springs, etc. - LVDT executions and compatible with electronic instruments of other brands available on request.

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