1. Althen Sensors
  2. Sensors
  3. Linear position sensors
  4. Intrinsically safe position sensors
  5. X138 Mid stroke slim-line linear position sensor

X138 Mid stroke slim-line linear position sensor

Compact and intrinsically safe position sensor with configurable stroke lengths from 51 to 100 mm. Ideal for hazardous gas and vapour environments.


Key features

  • Intrinsically safe for gas and vapour (Ex II 1G)
  • Non-contacting inductive technology
  • Compact 19 mm stainless steel housing
  • Customizable travel range from 51 to 100 mm
  • High linearity ≤ ±0.25% FSO at 20°C
  • Sealing to IP67 for harsh environments

Performance highlights

The X138 is a robust and intrinsically safe linear position sensor built for use in hazardous environments where gas or vapour may be present. Featuring non-contacting inductive technology, it offers infinite resolution, excellent stability, and outstanding repeatability. The sensor outputs a ratiometric analog signal (0.5 – 4.5 V), factory-calibrated to customer-defined travel lengths between 51 mm and 100 mm.

Usage conditions

The X138 is ATEX / IECEx / UKEX certified (Ex II 1G) and suitable for ambient temperatures from -40°C to +80°C. It features full EMC protection and an IP67-sealed stainless steel body for optimal durability in demanding industrial settings.

Possible applications

  • Hydraulic and pneumatic cylinder feedback
  • Valve and actuator position sensing
  • Motion monitoring in oil & gas environments
  • Mobile hydraulics in hazardous zones
  • Linear displacement feedback in test benches

Advantages of choosing this product

The X138 offers a reliable and space-efficient sensing solution for OEMs and engineers requiring intrinsic safety. Its slim 19 mm design allows for flexible mounting, and the configurable plunger options provide compatibility with a wide range of mechanical systems. Designed for long service life, it delivers high accuracy in challenging conditions.

Other important features

  • Output signal: 0.5 – 4.5V ratiometric
  • Operating voltage: 5V (±10%)
  • Temperature coefficient: < ±0.01%/°C
  • Frequency response: >10 kHz
  • Mounting: flange, rod-eye, or body clamp options
  • Plunger fittings: dome end, magnetic tip, rod eye, spring-loaded

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Technical Specifications

Specification Value
Calibrated travel range 51 mm to 100 mm
Linearity ≤ ± 0.25% FSO @ 20°C
Temperature coefficient < ± 0.01%/°C Gain, < ± 0.01%FS/°C Offset
Frequency response > 10 kHz (-3dB)
Resolution Infinite
Noise < 0.02% FSO
Input voltage +5V (4.5 - 5.5V)
Output signal 0.5 – 4.5V ratiometric
Operating temperature -40°C to +80°C
Storage temperature -40°C to +125°C
Body material Stainless steel, Ø19 mm
Sealing IP67
Vibration rating 10 g (IEC 68-2-6)
Shock rating 40 g (IEC 68-2-29)
Mounting options Flange, M5 rod-eye, body clamp
Plunger options Female thread, dome end, magnetic tip, spring-loaded
Intrinsic safety certification Ex II 1G, Ex ia IIC T4 Ga
EMC standard EN 61000-6-2, EN 61000-6-3

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