1. Althen Sensors
  2. Sensors
  3. Rotary position sensors
  4. Intrinsically safe inductive rotary sensors
  5. X520 Submersible rotary sensor

X520 Submersible rotary sensor

Intrinsically safe rotary sensor with inductive technology, engineered for high-pressure underwater applications up to 350 bar.


Key features

  • Intrinsically safe for explosive gas environments
  • Pressure-sealed up to 350 bar (IP68)
  • High accuracy with infinite resolution
  • Custom angle calibration from 15° to 160°
  • Non-contact inductive sensing technology
  • ATEX / IECEx / UKEX certified

Performance highlights

The X520 is a high-performance submersible rotary sensor designed for demanding underwater applications. It offers a linear output proportional to shaft rotation with exceptional stability and repeatability across a wide temperature range. The sensor uses advanced inductive, non-contact technology to eliminate wear and ensure long operational life.

Usage conditions

The sensor is pressure balanced and environmentally sealed to operate reliably at depths up to 350 bar. It’s built with a rugged 316 stainless steel housing and has been tested for vibration and shock to IEC standards, ensuring durability even in the harshest environments.

Possible applications

  • ROV and subsea systems
  • Offshore oil & gas platforms
  • Submersible actuator feedback
  • Hazardous environment rotary feedback
  • Deepwater robotic arms and joints

Advantages of choosing this product

  • Full rotational freedom with linear output in the calibrated angle range
  • Factory-calibrated to your specific angle range (15°–160°)
  • Compatible with Althen X005 Galvanic Isolation Amplifier
  • Maintenance-free, sealed, and corrosion-resistant construction
  • Five-wire connection recommended for cable runs over 10 meters

Other important features

  • Intrinsic safety: Ex II 1G, Ex ia IIC T4 Ga
  • Output: 0.5–4.5V ratiometric (5V supply)
  • Noise: < 0.02% FSO
  • EMC compliant: EN 61000-6-2, EN 61000-6-3
  • MTBF: 350,000 hours at 40°C

Do you need this sensor for your next project?

Request a no-obligation quote or send us your contact details for a free, no-obligation consultation. Our sales engineers will then contact you within a maximum of 1 to 2 working days.

Talk to an expert

Talk to our experts

Not exactly what you are looking for? We offer standard sensors, but can also help you with sensors adapted for you or a fully customised measurement solution. Contact us for advice or pricing.

Talk to an expert

Technical Specifications

Specification Value
Body diameter 60mm
Flange diameter 92 mm
Body length (to mounting face) 70 mm
Shaft 15 mm Ø 6 mm
Independent linearity ≤ ± 0.25% FSO @ 20°C up to 100° travel
Pressure effects Output change < 1°
Temp. coefficient (gain & offset) < ± 0.01% /°C
Frequency response > 10 kHz (-3dB)
Resolution Infinite
Noise < 0.02% FSO
Torque < 20 mNm static
Operating temperature -4°C to +50°C
Intrinsic safety Ex II 1G, Ex ia IIC T4 Ga (Ta = -40°C to 80°C)
Sealing IP68 to 350 Bar
Output signal 0.5–4.5 V ratiometric (with 5V supply)
Supply current 10 mA typical, 12 mA max.
Electrical connection Wet mate 4-pin IP68 350 Bar connector
Cable option 3-core or 5-core 0.25 mm², up to 1000m length

Related products

Need something else?

X005 Galvanic Isolation Amplifier

  • ATEX and IECEx certified
  • 0.5–9.5V or 4–20mA output
  • 4.7kHz bandwidth for dynamic signals
Datasheet View product

X125 350 bar submersible stand-alone linear position sensor

  • Intrinsically safe for gas zones
  • Sealing to IP68, 350 bar
  • Custom travel 5–800 mm
Datasheet View product

X100 Intrinsically safe linear position sensor

  • Stroke range: 5 mm to 800 mm
  • Non-contact inductive technology
  • Sealing to IP65/IP67 available
Datasheet View product