1. Althen Sensors
  2. Sensors
  3. Linear position sensors
  4. Intrinsically safe position sensors
  5. M118 Short stroke slim-line linear position sensor

M118 Short stroke slim-line linear position sensor

Compact, intrinsically safe linear position sensor for mining environments. Offers high accuracy, flexible configurations and non-contact operation for confined spaces.


Key features

  • Intrinsically safe for mining environments (Ex I/II M1/1GD certified)
  • Compact 19 mm stainless steel housing
  • Travel ranges from 2 to 50 mm, custom-calibrated
  • Non-contact inductive technology eliminates mechanical wear
  • High resolution with excellent linearity and EMC protection
  • Sealed to IP67, operating in temperatures from -40 °C to +80 °C

Performance highlights

The M118 is a compact, non-contact linear position sensor designed for hazardous areas. Featuring a short-bodied 19 mm diameter stainless steel housing, it delivers high stability, accuracy, and repeatability across a wide temperature range. Its output is linear to the stroke, from 2 mm up to 50 mm, and factory-calibrated per specification.

Usage conditions

This model is ATEX / IECEx / UKEX certified (EX07 electronics) and suitable for gas, vapour, and dust atmospheres, including mining (Ex I/II M1/1GD). It operates between -40 °C and +80 °C and is sealed to IP67. EMC compliance, shock (40 g) and vibration (10 g) resistance ensure reliable performance in harsh conditions.

Possible applications

  • Underground mining machinery
  • Position feedback in safety-critical environments
  • OEM compact actuators and robotics
  • Intrinsically safe environments with confined space
  • Rail or heavy-duty industrial automation

Advantages of choosing this product

The M118 stands out for its slim design, robust construction, and custom-calibrated stroke. Its galvanic isolation amplifier (X005) enables safe use in explosive environments. The five-wire option maintains signal integrity over long cable runs, making it ideal for remote monitoring in hazardous areas.

Other important features

  • Axial or radial mounting options
  • Various plunger configurations: captive/free, spring-loaded, magnetic tip
  • Output: 0.5–4.5 V ratiometric with 5 V supply
  • Resolution: Infinite, frequency response > 10 kHz
  • Optional flange, rod eye bearings, or clamps for mounting

Do you need this sensor for your next project?

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Technical Specifications

Specification Value
Body diameter 19 mm
Calibrated travel 2–50 mm (customer-defined)
Body length (Axial/Radial) 78–118 mm / 97–137 mm
Plunger diameter Ø6 mm
Independent linearity ≤ ±0.25% FSO @ 20 °C
Temperature coefficients < ±0.01%/°C gain & offset
Frequency response >10 kHz (-3 dB)
Resolution Infinite
Noise < 0.02% FSO
Sealing IP67
Operating temperature -40 °C to +80 °C
Storage temperature -40 °C to +125 °C
Vibration 10 g (IEC 68-2-6)
Shock 40 g (IEC 68-2-29)
Output 0.5–4.5 V ratiometric
Supply voltage +5 V (4.5–5.5 V)
Intrinsic safety Ex I/II M1/1GD; Ex ia IIC T4 Ga; Ex ia IIIC T135°C Da; Ex ia I Ma
Input parameters Ui: 11.4 V, Ii: 0.2 A, Pi: 0.51 W
Capacitance (w/ cable) Ci: 1.36 µF
Inductance (w/ cable) Li: 860 µH
Max. cable length 1000 m
Mounting options Flange, rod-eye, body clamp
Plunger styles Spring-loaded, magnetic tip, dome, M4 thread

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