1. Althen Sensors
  2. Sensors
  3. Linear position sensors
  4. Intrinsically safe position sensors
  5. X133 Mid stroke linear position sensor

X133 Mid stroke linear position sensor

Compact and intrinsically safe linear sensor designed for reliable displacement measurements in hazardous gas or vapour environments.


Key features

  • Intrinsically safe for ATEX/IECEx/UKEX Zone 0
  • Wear-free inductive sensing technology
  • Configurable stroke length (51 to 100 mm)
  • Stainless steel construction with IP65/IP67 sealing
  • EMC protected with infinite resolution
  • Compact body with multiple mounting options

Performance highlights

The X133 mid-stroke linear position sensor offers precise and stable measurement in environments where explosive gas or vapour atmospheres are present. Its non-contact inductive sensing technology ensures no wear, excellent repeatability, and long life with minimal maintenance.

Usage conditions

Certified to ATEX, IECEx, and UKEX standards, the X133 sensor is designed for Zone 0 use (Ex II 1G), with a temperature range of -40°C to +80°C. Its rugged stainless steel housing and environmental sealing up to IP67 make it ideal for harsh industrial conditions.

Possible applications

  • Oil & gas environments (hazardous areas)
  • Industrial automation systems
  • Position feedback in compact OEM machinery
  • Valve or actuator monitoring
  • Test rigs in explosion-prone atmospheres

Advantages of choosing this product

With configurable travel ranges, multiple output and mounting options, and compatibility with the Althen X005 galvanic isolation amplifier, the X133 provides excellent flexibility and safety. It is calibrated per customer specification and supports both 3-wire and 5-wire connections for optimal accuracy, even over long cable lengths.

Other important features

  • Independent linearity: ≤ ±0.25% FSO @ 20°C
  • Frequency response: > 10 kHz
  • Resolution: Infinite
  • Vibration & shock resistant
  • Output: 0.5–4.5V ratiometric (EX07 electronics)
  • Calibration options available (Gain, Offset)

Do you need this sensor for your next project?

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Technical Specifications

Specification Value
Measurement range 51 mm to 100 mm
Linearity ≤ ± 0.25% FSO @ 20°C
Output 0.5–4.5V (ratiometric), EX07 electronics
Supply voltage +5V DC (4.5 to 5.5V)
Supply current 10 mA nominal, 12 mA max
Resolution Infinite
Frequency response > 10 kHz (-3dB)
Noise < 0.02% FSO
Intrinsic safety Ex II 1G, Ex ia IIC T4 Ga
Operating temperature -40°C to +80°C
Storage temperature -40°C to +125°C
Housing material Stainless steel
Sealing IP65 or IP67 depending on configuration
EMC compliance EN 61000-6-2, EN 61000-6-3
Shock/vibration 40g shock, 10g vibration (IEC 68-2-29/6)
Mounting options Flange, M5 rod eye, body clamps
Plunger options Free or captive, spring-loaded, magnetic, dome end
Connection options M12, DIN, radial or axial cable/connector
Cable length Up to 15m (certified for 1km max with specific cable)

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  • 0.5–9.5V or 4–20mA output
  • 4.7kHz bandwidth for dynamic signals
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  • Infinite resolution & stability
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