Factory-direct LVDT linear displacement sensors for OEM equipment builders worldwide. Spring-loaded gauging probes, separate-core transducers, and pen-type LVDT sensors — contactless, wear-free, ±0.1% linearity. CE certified, IP67 rated, custom stroke and output on request.
What is an LVDT displacement sensor? An LVDT (Linear Variable Differential Transformer) is a contactless inductive displacement transducer that measures linear position without friction or wear. A free-floating ferromagnetic core moves inside a wound coil assembly — the differential output voltage is precisely proportional to displacement. Zero mechanical contact means theoretically infinite service life. SEGMENsensor manufactures LVDT sensors as a factory-direct OEM supplier in Shenzhen, China, with strokes from ±0.5 mm to ±500 mm, linearity ±0.1% FS, and outputs in 4-20 mA, 0-10 V, or RS485.
Four series covering gauging probes, spring-loaded sensors, separate-core transducers, and long-stroke pen-type LVDTs — all with DC or AC output options.
Ultra-high precision spring-loaded LVDT gauging probes for dimensional inspection, surface profiling, and quality control. Ruby or carbide tip. Resolution limited only by signal conditioner. Ideal for CMM integration and automated inspection lines.
Separate-core LVDT with rigid core rod attachment. The coil body is fixed while the core rod is bolted to the moving part — ideal for hydraulic valve spool position, actuator stroke, and injection moulding machine screw position monitoring.
Long-stroke pen-type LVDT with integrated signal conditioner. Available in 4-20 mA, 0-10 V, and RS485/Modbus RTU outputs. Single-cable connection to PLC analog or digital input. Ideal for press machines, test rigs, and machine tool axis monitoring.
All parameters customizable for OEM applications. LVDT transducer OEM China — custom stroke, output, connector, and housing on request.
| Parameter | SDVH Gauging Probe | SDVG Separate-Core | SLT Pen-Type |
|---|---|---|---|
| Stroke (Full Range) | ±0.5 / ±1 / ±2 / ±5 mm | ±2 / ±5 / ±10 / ±25 / ±50 / ±100 mm | ±10 / ±25 / ±50 / ±75 / ±100 / ±150 / ±200 / ±250 / ±500 mm |
| Linearity | ±0.1% FS (ultra-high acc.) | ±0.25% FS (standard) | ±0.25% FS standard / ±0.1% FS optional |
| Resolution | Infinite (analog signal) | Infinite (analog signal) | Infinite (analog) / 0.001 mm (RS485 digital) |
| Repeatability | ±0.01% FS | ±0.01% FS | ±0.01% FS |
| Output Signal | AC differential / DC 0–10V / 4-20mA | AC differential / DC 0–10V / 4-20mA | 4-20mA / 0-10V / ±10V / RS485 Modbus |
| Excitation (AC type) | 1–10 kHz, 1–5 Vrms | 1–10 kHz, 1–5 Vrms | Built-in DC-DC converter (10–30V DC supply) |
| Supply Voltage (DC type) | 10–30V DC | 10–30V DC | 10–30V DC |
| Operating Temp. | -40°C to +125°C | -40°C to +125°C | -40°C to +85°C |
| Protection Rating | IP67 | IP67 | IP67 |
| Housing Material | 303 / 316L Stainless Steel | 303 / 316L Stainless Steel | 303 Stainless Steel / Aluminium alloy |
| Electrical Connection | Integral cable / M12 × 1 connector | Integral cable / M12 × 1 connector | M12 × 1 connector / custom cable |
| Certifications | CE RoHS | CE RoHS | CE RoHS |
| OEM MOQ | 10 pcs | 10 pcs | 10 pcs |
| Lead Time | 3–5 weeks | 3–5 weeks | 3–5 weeks |
Understanding LVDT operating principle helps engineers select the correct variant for their OEM application.
An AC voltage (1–10 kHz) is applied to the primary coil, creating an alternating magnetic field throughout the cylindrical coil former.
The ferromagnetic core moves inside the bore. Its position determines how much magnetic flux couples into each of the two secondary coils — one increases while the other decreases.
The two secondary voltages are subtracted (differential connection). The result is a voltage proportional to displacement with excellent linearity — positive or negative depending on direction.
A built-in ASIC conditioner (DC-powered models) demodulates the AC signal to a 4-20 mA, 0-10 V, or RS485 output. AC output models connect directly to external LVDT signal conditioners.
LVDT sensors excel in environments with vibration, temperature extremes, and demanding duty cycles where contact-based sensors fail. Custom LVDT OEM factory — specify your application below.
SEGMENsensor has manufactured LVDT displacement sensors for OEM equipment builders since 2019. We are a direct factory — not a distributor — with in-house winding, signal conditioning PCB assembly, and calibration traceable to national standards.
Choose the right displacement sensor for your OEM application. LVDT is the best choice for short-stroke, vibration-rich, high-accuracy environments.
| Criterion | LVDT (SEGMENsensor) | Magnetostrictive | Linear Potentiometer | Draw-Wire Encoder |
|---|---|---|---|---|
| Mechanical Contact | ✓ None — frictionless | ✓ None | ✗ Wiper contact | Wire friction |
| Service Life | ✓ Infinite (no wear) | ✓ Very long | Limited (10M cycles) | Wire fatigue limit |
| Best Stroke Range | ±0.5 mm – ±500 mm | 25 mm – 8,000 mm | 10 mm – 1,000 mm | 100 mm – 50,000 mm |
| Accuracy | ✓ ±0.1% FS | ✓ ±0.01% FS | ±0.1–±1% FS | ±0.1–±0.5% FS |
| Vibration Immunity | ✓ Excellent | Good | Poor (wiper bounce) | Moderate |
| Absolute Position | Absolute (power-cycle safe) | ✓ Absolute | Absolute | Absolute |
| OEM Cost | ✓ Low–Medium (factory direct) | Medium–High | ✓ Lowest | Low–Medium |
Controlled coil winding, PCB assembly, and calibration. Batch traceability on every order.
EMC and LVD directive compliance. CE declaration provided for EU customs clearance.
All standard LVDT models are RoHS compliant. Declaration of conformity on request.
20+ years manufacturing LVDT sensors. Factory direct — not a distributor or trading company.
UK Conformity Assessed — required for Great Britain market entry. Equivalent to CE for England, Scotland and Wales.
Common questions from OEM engineers. Can't find your answer? Email info@segmensensor.com — we reply within 24 hours.
Tell us your stroke range, required output, operating temperature, and quantity. Engineering team replies within 24 hours.
SEGMEN Industrial Development Co., Ltd. · Shenzhen, China · info@segmensensor.com · +86 138 2870 4591
SEGMENsensor manufactures complementary position and flow sensors — all from the same factory, same certifications, same lead time.