Product Short Description
Product Series
MDB Magnetostrictive Linear Position Sensor MLSI Compact Series
Product Brief
Magnetostrictive contactless linear position transducer designed for hydraulic cylinder internal mounting, providing continuous absolute position feedback without zero drift after power cycle loss.
Description
Technical Specifications
- Measuring Stroke: Customizable standard stroke range 0 mm to 1000 mm (DR11 base mechanical form factor)
- Output Signal: 4–20 mA analog current output
- Linear Accuracy: ±0.05 % FS full scale
- Resolution: 0.001 mm infinite digital resolution
- Operating Supply: DC 12 V to DC 24 V
- Operating Temperature: -40 °C to +85 °C
- Protection Rating: IP68 fully sealed rod assembly
- Rod Diameter: 11 mm stainless steel measuring rod
- Magnet Type: Floating ring permanent magnet for internal cylinder integration
Functional Features
- Absolute position measurement; no homing procedure required after power interruption
- Contactless magnetostrictive operation with zero mechanical friction wear
- Short-circuit reverse polarity protection built into signal circuit board
- Electromagnetic interference suppression compliant with EN 61000-6-2 industrial EMC standard
- Continuous self-diagnostic signal for cable breakage and magnet loss
Structural Characteristics
- Measuring rod: AISI 316 stainless steel seamless tube
- Internal waveguide: Magnetostrictive nickel-iron alloy wire
- Housing: Aluminum alloy extrusion with hard anodized anti-corrosion coating
- Sealing system: FKM fluorocarbon O-rings resistant to hydraulic mineral oils, glycol fluids
Working Principle
Magnetostrictive waveguide generates torsional strain wave upon interaction with permanent position magnet; precise time measurement of wave propagation along waveguide calculates absolute linear position of magnet target.
Advantage Highlights
- IP68 full submersion rating for direct integration inside hydraulic/pneumatic cylinders
- Absolute measurement eliminates position offset after power reset
- Wide low-temperature range supports mobile heavy machinery and outdoor hydraulic systems
- FKM sealing compatible with all standard industrial hydraulic media
- Compact 11 mm rod diameter fits small-bore miniature hydraulic actuators
Applicable Industries
Construction machinery hydraulic control, injection molding machine clamping systems, metal forming press cylinders, marine hydraulic actuation, agricultural farm equipment
Installation Requirements
- Insert 11 mm measuring rod fully into cylinder blind end bore; match floating ring magnet to piston internal groove
- Max cable extension length 50 m for 4–20 mA analog output without signal amplification
- Mount sensor housing away from high-current power cables to reduce electromagnetic noise
- Torque mounting gland nut to 12 N·m to maintain IP68 sealing integrity
Operation Precautions
- Prevent rod surface scratching during cylinder assembly; surface defects cause signal echo distortion
- Avoid exposure to high-pressure water jet impact directly on sensor housing gland
- Replace FKM O-rings during cylinder overhaul to prevent hydraulic fluid ingress
- Do not demagnetize position magnet via contact with high-strength external magnetic fields
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