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Miniature, LVDT Linear Position Sensors

-5 to 5 mm, 54 mV/V/mm Output


Item# LD400-5

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 $666.77
10-24 $633.43
25-49 $620.10
50-99 $593.43
100+ $580.09

In stock

Lead Time (If not in stock): 10 weeks
-5 to 5 mm, 54 mV/V/mm Output LD400-5 LD400-5
  • High Output Miniature LVDT Transducers
  • Ideal for Small Actuators
  • Delrin Bearings for Precise Motion
  • Infinite Resolution

LD400-5 Model Options

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Electrical Output
Housing Length
Housing Diameter/Width

  • Body Material 400 Series stainless steel
  • case Material 400 Series stainless steel
  • Electrical Connection Red: + Excitation
  • Maximum Ambient Temperature 80 {C} (176 {F})
  • Maximum Compensation Temperature 80 {C} (176 {F})
  • Measurement Type Displacement
  • Minimum Compensation Temperature -20 {C} (-4 {F})
  • Output Signal Type DC
  • Reading Rate LD400-1 and LD400-2.5 = 5 ms
  • Sensitivity Range <0.025% FC/°C
The LD400 Series miniature dc output LVDT transducers provide a method of measuring displacements up to ±5 mm (±0.20 inch) with very high accuracy and infinite resolution. They have a free-guided armature incorporating Acetal bearings, which provide near frictionless motion to detect the smallest movement the associated instrumentation is capable of identifying. These transducers utilize a precision linear variable differential transformer (LVDT) as the measuring source, together with hybrid ICs which include an oscillator, demodulator, and filter; together, they comprise a self-contained unit that accepts dc input and provides dc output relative to armature position. The unit's high linearity and low mass of moving parts is ideally suited to applications in civil, mechanical, chemical and production engineering.


Linearity: 0.3% FS
Excitation: 10 to 24 Vdc regulated
Energizing Current at 10 Vdc:
LD400-1: 10 mA
LD400-25: 10 mA
LD400-5: 13 mA
Response Time:
LD400-1 and LD400-2.5 = 5 ms
LD400-5 = 3 ms
Frequency Response: 50 Hz for -3 dB
Ripple: <1% FS
Thermal Effect:
LD400-1: <0.02% FS/°C
LD400-2.5 and LD400-5: <0.01% FC/°C
Sensitivity: <0.025% FC/°C
Compensated Temperature Range:-20 to 80°C (-4 to 176°F)
Operating Temperature Range: -20 to 80°C (-4 to 176°F)
Electrical Connection: 2.9 m (9') shielded, color-coded cable
Sensitivity and Linearity Data: Provided with a transducer output impedance of 2.4 kΩ into a calibration load of 20 kΩ at 20°C (68°F); variations in these parameters will change performance

Threaded Core: M2 thread
Core Material: Ni/Fe-Radio Metal 50
Case Material: 400 Series stainless steel

Electrical Connections:
Red: + Excitation
Blue: - Excitation
White: + Signal*
Green: - Signal
Yellow: No connection
* White and red in phase for positive inward displacement.
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Is it possible to just order the pin? This part bends and does not necessarily need the entire LVDT replaced, just the pin in the center.

Asked by: Anonymous
Yes. Part number for the replacment core is LD400-5-CORE/ASSEMBLY Cost $94.31 eaach
Answered by: Applicatrions Engineer JK
Date published: 2020-09-29

Does the LD400 have any environmental protection? What is the IP rating?

Asked by: Cewell
There are no IP or NEMA ratings for the the LD400 displacement sensor.
Answered by: Applicatrions Engineer JK
Date published: 2022-10-12

Do these sensors come with signal conditioners? If not, which signal conditioners do you offer are most compatible with these sensors?

Asked by: AJKJD
The LD400-5 has a 54mV/V/mm sensitivity. It can be powered by a regulated DC Voltage between 10V and 24VDC. If you used the high end excitation of 24VDC (54mm X 24VDC X 5mm) you would be getting a +/- 6.480 VDC output signal from the sensor. You may required signal conditioning
Answered by: Applicatrions Engineer JK
Date published: 2021-02-12

What is the resolution of this sensor ?

Asked by: ROHITH
Rohith typically resolution on LVDTs will be infinite, but you will read accurately to the second decimal typically. Most times it will be defined by the number of digits on your readout or DAQ system. Thank you.
Answered by: SAE DJO
Date published: 2019-11-16

Is there a repalcement for the LD400-1's pin? I see that there is one for the 2.5 and 5mm version under the &quot;LD400-X-CORE/ASSEMBLY&quot;, but there does not appear to be one for the 1mm version.

Asked by: CFTHOR
Thank you for your inquiry, Unfortunately, we do not carry the Core Assembly for the LD400-1
Answered by: rkent
Date published: 2022-05-06
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