Designed specifically for tight spaces, the Microminiature Gauging LVDT delivers high performance in a tiny package. A sapphire bearing and spring-stop guide the tip, providing an exceptionally smooth static and dynamic response. The Microminiature Gauging LVDT features micron-to-sub-micron resolution, linear analog output, flat dynamic response to kHz levels, and very low temperature coefficients. Extremely lightweight, captive cores are tiny yet rugged. Superelastic, corrosion-resistant alloys provide resistance to kinking and permanent deformation, and allow complete submersion of the instrument

Where to Buy?
U.S. International OEM

List Price:




High Performance

  • Micron resolution with large stroke/size ratio
  • Gauging pin enables measurement on moving parts
  • Frictionless design for robust use over millions of cycles
  • Suitable for use in harsh fluids and environments

Ease of Use

  • World’s smallest linear displacement sensor
  • Plug and play usability
  • Easily customized to suit specific requirements
  • Signal conditioning options for any application

Electrical Specifications

Linear Stroke Lengths

3, 6 & 9 mm (standard version)
1.5 mm (high resolution version)

Accuracy ± 1 .0% using straight line
± 0.1% using polynomial
Sensitivity DEMOD output/sensor range
Signal to noise 2000 to 1 (with filter 3 dB down at 800 Hz, standard); 600 to 1 (unfiltered) noise measured peak to peak
Resolution 1.5 µm for 3 mm stroke
3.0 µm for 6 mm stroke
4.5 µm for 9 mm stroke
300 nm for high resolution version
Frequency response 800 Hz standard, 20 kHz optional
Temperature coefficient offset 0.0029%/ ° C (typical)
span 0.030%/ ° C (typical)
Hysteresis ± 1 micron
Repeatability ± 1 micron

Mechanical Specifications

Overall body length 24 mm for 3 mm stroke
40 mm for 6 mm stroke
50 mm for 9 mm stroke
24 mm for high res version
Outside diameter 1.8 mm (smooth body)
Spring stiffness 0.2 Newtons/mm (1 lb/inch)
Bearing materials sapphire on stainless steel
Standard core tips 1.5 mm sapphire ball, 1.5 mm sapphire cup
Housing material

316 stainless steel, smooth body;

8-32, 400 series stainless steel imperial threaded body;

M4x0.7-6g, 400 series steel metric threaded body

Attachment method clamping collar or threaded body
Leadouts 45 cm multistranded, shielded, stainless steel reinforced, Teflon insulated
Connector keyed Lemo 4-pin, polyolefin relief
Operating temperature -55 to 175 °C
Core material superelastic NiTi alloy
Cable diameter 0.036 “


There are no downloads for this product.

As an example. here is the Quick Start Guide for the M-DVRT-9:

Page 7 refers to the Slope and Offset that you will need to enter into the Smart Motherboard software.

In the Smart Motherboard software, click Tools.

Click Configuration and the Configuration screen appears.

Select the appropriate channel (remember that each channel, i.e., each DVRT and DEMOD –DVRT signal conditioner card in the Smart Motherboard is calibrated separately) by checking the Channel check box.

Select the Linear Radio Button.

Enter the Slope and Offset in the number scroll boxes.

Select None in the Peak Detect drop-down.

Change the Units from Volts to mm (for millimeters) by wiping through with your mouse.

Click File.

Click Save As Default.

Click File.

Click Return and you are ready to sample in millimeters.

The MG-DVRT Microminiature Gauging and SG-DVRT Subminiature Gauging Differential Variable Reluctance Transducers are typically calibrated with their signal conditioning electronics at the factory. These calibrations are highly accurate and are always recommended. However, under certain conditions the user may determine that a field calibration should be performed. This technical note provides a step-by-step instruction to field calibration and assumes the user is familiar with the DVRT displacement transducer and its signal conditioning electronics (Motherboard, Smart Motherboard, or DEMOD-DC).

Click here.

In order to return any LORD MicroStrain® product either for repair or return, you must contact us for a Return Merchandise Authorization number (RMA). If you purchased directly from LORD MicroStrain® in the United States, please contact your Sales or Support Engineer to obtain an RMA.  If you purchased directly from a LORD MicroStrain® distributor, please contact your distributor to obtain an RMA.

If you are located in the United States, LORD MicroStrain® supplies you directly.  If you are in located in another country, LORD MicroStrain® products are available exclusively from LORD MicroStrain® distributors.  Please use this locator to determine your distributor:

To enable customers to try our standard products risk free, LORD MicroStrain® offers a 30 day return on the purchase of a starter kit. In order to take advantage of this offer, a purchase order or payment for the starter kit is required when the order is placed. 30 day trial details may be found at:

LORD MicroStrain® Support Engineers are always available to support you in any way we can by phone, email, SKYPE or Live Chat from our home page.  Contact details may be found at:

LORD MicroStrain® insures all products shipments to their full value unless the customer specifically states a different method.

LORD MicroStrain® warrants its standard products to be free from defective material and workmanship for a period of one (1) year from the original date of purchase.  Warranty details may be found at:

No, carbon fiber has not been shown to pose a problem.

Yes, as a courtesy, LORD MicroStrain® will provide an appropriate drill bit and tap to match the DVRT's thread size at a nominal charge.

In most cases, MicroStrain calibrates every DVRT with its accompanying electronics and provides a detailed calibration certificate. The certificate provides 3 methods of calibration and all the particulars including formulas to resolve voltage into engineering units.

  • Standard Least Squares Linear Fit provides a simple mathematical method to convert sensor output to displacement and delivers reasonable accuracy.
  • Polynomial Fit provides a more mathematically intensive method to convert sensor output to displacement and in turn delivers a high degree of accuracy. A possible drawback to some users of this method may be that it can not accurately report measurements beyond its stroke length (i.e., over-stroking).
  • Multi-Segment Linear Fit provides the most mathematically intensive method to convert sensor output to displacement, delivers a high degree of accuracy and is not subject to the drawback of over-stroking.
  • Body length to stroke ratios for DVRTs are typically 2.5 to 1 as compared to 6 to 1 for LVDTs.
  • Microminiature DVRTs are available in body diameters of only 1.5 mm (.060") and with core diameters of only 0.5 mm (.020"); this makes them the World's smallest commercially available linear displacement transducers.
  • DVRTs maintain their temperature stability due to the use of two coils arranged differentially.
  • Each DVRT is capable of submersion as a standard feature.
  • Each DVRT can be hermetically sealed as an option.
  • Microminiature DVRTs are available with super-elastic, nickel titanium cores.
  • DVRTs have a standard operating temperature range up to 175 degrees C; LVDTs typically only operate up to 85 degrees C.
  • DVRTs have been operated successfully in liquid nitrogen; LVDTs typically only operate to -20 degrees C.

The output is an analog DC voltage proportional to linear displacement.  The full scale voltage is optionally +/-5 volts or 0-10 volts.  The analog voltage is easily read using a multi-meter or DAQ.  The voltage can also be read in the digital domain by using LORD MicroStrain® Smart Motherboards.  These Smart Motherboards provide a data gateway to PC-based software or to user-programmable LCD displays on the motherboard itself.

Yes. DVRTs can be used in wet environments.  One of our customers uses the DVRT to measure mussel growth on the ocean floor.  An automotive customer uses the DVRT in a hot oil environment for under-the-hood testing.  Our orthopaedic customers use the DVRT for soft and hard tissue testing (in vivo and ex vivo) in cadaver and animal studies.

The spring force on standard units is 0.2 newtons/mm or 1 pound/inch.

Sandard DVRTs can operate up to 100 PSI.  However, custom-designed sensors have been used in applications up to 10,000 PSI.  Please contact your sales or support engineer for more info.

Typically, every DVRT is calibrated at the factory with its accompanying DEMOD signal conditioner.  The calibration is made over the entire system (DVRT and DEMOD) to insure the highest accuracy.  DVRTs and DEMODS are color-coded to insure that they stay together as a pair when in use.

The term ‘Motherboard’ refers to the LORD MicroStrain® DEMOD-DVRT or DEMOD-DVRT-TC signal conditioner mounting chassis.  The standard Motherboard provides a mounting slot and power to the individual DEMODs.  The Smart Motherboard provides a mounting slot, power and digital communications (RS-232) to the individual DEMODs.  Both Motherboard and Smart Motherboard provide analog ouput to a DAQ.  In addition, Smart Motherboard provides digital output to a computer.  Motherboards and Smart motherboards can accommodate 1 to 8 DEMOD cards.

DVRT Type Threaded Core Threaded Body Core Clamps Body Clamps SM-Block Core/Body Magnetic Mount Core/Body
Subminiature X X     X X
Subminiature Gauging X X        
Microminiature X X X X    
Microminiature Gauging X X   X    
Non-Contact   X**        

** Non-Contact comes standard with threaded body except for 5.0.


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