Factory-direct magnetostrictive linear position sensors for OEM machine builders worldwide. Stroke 25mm–8000mm, resolution 0.001mm, accuracy ±0.05mm. SSI, 4-20mA, CANopen, RS485 outputs. Hydraulic cylinder built-in rated to 350 bar. CE certified, IP67/IP68. MOQ 10 pcs — 30%–50% lower cost than premium imported brands.
What is a magnetostrictive position sensor? A magnetostrictive position sensor is a non-contact absolute linear position transducer based on the Wiedemann effect. A current pulse travels along a magnetostrictive waveguide; a position magnet on the moving part creates a torsional strain wave at the exact point of contact. The travel time of this wave determines absolute position to 0.001mm resolution — with no zeroing required at power-up. SEGMENsensor manufactures magnetostrictive sensors in Shenzhen, China, covering 25mm to 8000mm stroke, with SSI, 4-20mA, CANopen, and RS485 outputs.
Three configurations covering external rod-type sensors, hydraulic cylinder built-in sensors, and liquid level measurement — all absolute, all non-contact, all CE certified.
Standard external rod-type magnetostrictive sensor with aluminium profile housing. Floating position magnet attaches to the moving part. Available with SSI Gray Code, 4-20mA, 0-10V, and RS485/Modbus RTU outputs. Ideal for machine tool axis feedback, hydraulic actuator control, and test bench position measurement.
In-cylinder magnetostrictive sensor designed for installation inside hydraulic cylinder bores. Rated to 350 bar operating pressure. The sensor rod installs through the end cap; the position magnet mounts on the piston. Absolute position output eliminates external position sensors on mobile machinery, press machines, and injection moulding equipment.
Magnetostrictive liquid level sensor for continuous level measurement in process tanks. Dual-float variant measures both liquid level and interface (e.g. oil/water boundary). Explosion-protected versions available: Ex ia intrinsically safe (EPL Ga) for Zone 0, 1 and 2, Ex d flameproof (EPL Gb) for Zone 1 and 2. Anti-corrosion PFA-coated version for acids and aggressive chemicals.
All parameters meet or exceed premium imported brands at 30%–50% lower cost. ISO 9001 magnetostrictive OEM manufacturer China — custom stroke, output, and connector on request.
| Parameter | R-Series Rod Type | Hydraulic Built-In | Liquid Level Series |
|---|---|---|---|
| Stroke Range | 50–2500mm (standard) up to 4000mm (long) | 50–4000mm | 200–8000mm |
| Resolution | 0.001mm (1 µm) | 0.001mm (1 µm) | 0.1mm |
| Accuracy | ±0.05mm FS | ±0.05mm FS | ±0.5mm FS |
| Repeatability | ±0.001mm | ±0.001mm | ±0.1mm |
| Linearity | ±0.02% FS | ±0.02% FS | ±0.1% FS |
| Output Signals | SSI Gray Code, 4-20mA, 0-10V, RS485 Modbus | SSI Gray Code, CANopen, Start/Stop, 4-20mA | 4-20mA, RS485 Modbus, HART (optional) |
| Supply Voltage | 18–30V DC | 18–30V DC | 24V DC |
| Operating Temp. | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
| Pressure Rating | N/A (external) | 350 bar (50 MPa) | 10 bar (standard) |
| Protection Rating | IP67 | IP68 | IP67 |
| Housing Material | Aluminium alloy (profile) | 316L Stainless Steel | 316L SS / PFA-coated |
| Electrical Connection | M12 × 1 or cable | M12 × 1 or cable | M20 cable gland |
| Certifications | CE RoHS ISO9001 | CE RoHS ISO9001 | CE ATEX (optional) |
| OEM MOQ | 10 pcs | 10 pcs | 10 pcs |
| Lead Time | 3–5 weeks | 3–5 weeks | 3–5 weeks |
Magnetostrictive sensing (Wiedemann effect) delivers absolute position measurement with micron-level resolution and no moving contacts — theoretically unlimited service life.
A short electrical current pulse travels along the magnetostrictive waveguide wire at the speed of light, generating a circumferential magnetic field around the wire.
The permanent magnet on the moving part (the position float) interacts with the circumferential field at its exact location, inducing a torsional (twisting) mechanical strain in the waveguide at that single point.
The torsional strain wave propagates along the waveguide at the speed of sound. A magnetostrictive pickup at the end detects the wave's arrival time.
The time interval between the current pulse and the strain wave arrival is converted to absolute position by the internal ASIC. The result is output as SSI, 4-20mA, CANopen, or RS485 — absolute, not incremental.
Many OEM machine builders and system integrators are switching from premium imported magnetostrictive brands to SEGMENsensor — same technical specifications, 30%–50% lower cost, equivalent lead time, full CE certification.
Tell us your current sensor's stroke, output type, and connector spec. We'll confirm compatibility and quote within 24 hours.
Magnetostrictive sensors excel wherever absolute position is required without incremental re-homing, and wherever high pressure or harsh environments eliminate contact-based alternatives.
SEGMENsensor has manufactured magnetostrictive position sensors since 2019. We are a direct factory — in-house waveguide processing, ASIC-based signal conditioning, and ISO 9001 calibration. No trading company. No distributor. Factory-direct price is 30%–50% below imported brands.
Choose the right sensor for your OEM application. Magnetostrictive is the best choice for long strokes, absolute position, and hydraulic cylinder integration.
| Criterion | Magnetostrictive (SEGMENsensor) | LVDT | Linear Potentiometer | Linear Encoder |
|---|---|---|---|---|
| Absolute Position | ✓ Absolute — no re-homing | ✓ Absolute | ✓ Absolute | Incremental (needs homing) |
| Best Stroke Range | ✓ 25mm–8000mm | ±0.5mm–±500mm | 10mm–2000mm | Unlimited |
| Resolution | ✓ 0.001mm | ✓ Infinite (analog) | 0.01%–0.1% FS | 1–5µm |
| Hydraulic In-Cylinder | ✓ Up to 350 bar | Not rated | Not suitable | Not suitable |
| Vibration Immunity | ✓ Excellent | ✓ Excellent | Poor (wiper bounce) | Moderate |
| OEM Cost (Factory) | ✓ Medium (30–50% below import) | Low–Medium | ✓ Lowest | High |
In-house waveguide processing, PCB assembly, and calibration. Batch traceability on every order.
EMC and LVD directive compliance. CE declaration provided for EU customs clearance.
Ex ia (Zone 0/1/2) and Ex d (Zone 1/2) variants for oil, gas, and chemical applications.
20+ years manufacturing magnetostrictive sensors. Direct factory — not a trading company.
Common questions from OEM engineers. Email info@segmensensor.com for application-specific advice within 24 hours.
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Tell us your stroke, output type, operating pressure, and quantity. Engineering team replies within 24 hours.
SEGMEN Industrial Development Co., Ltd. · Shenzhen, China · info@segmensensor.com · +86 138 2870 4591