1. Althen Sensors
  2. Sensors
  3. Linear position sensors
  4. Intrinsically safe position sensors
  5. M114 Submersible stand-alone linear position sensor

M114 Submersible stand-alone linear position sensor

Robust and intrinsically safe sensor designed for full submersion in mining environments. Reliable, high-accuracy linear displacement feedback in compact form.


Key features

  • Intrinsically safe for mining zones: Ex I/II M1/1GD
  • Fully submersible up to 100 meters, IP68 10 bar / IP69K
  • Travel set to customer requirement: 5 to 800 mm
  • Compact and stainless steel design for harsh conditions
  • High linearity and stability over wide temperature range
  • Optional spring-loaded or captive push rod fittings

Performance highlights

The M114 delivers precise, linear output signals proportional to stroke length. Built on non-contact inductive technology, it ensures long service life with no wear. With ratiometric output (0.5–4.5 V) and high resolution, the sensor provides excellent repeatability and low noise, even in harsh mining environments.

Usage conditions

Designed for continuous submersion, the sensor operates reliably between –40 °C and +80 °C, and withstands pressures up to 10 bar. The body and push rod are made of stainless steel, and the housing meets IP68/IP69K standards.

Possible applications

  • Underground mining machinery
  • Hydraulic and pneumatic cylinders
  • Subsea or offshore displacement measurements
  • Industrial automation in explosive areas
  • Environmental monitoring in high-pressure zones

Advantages of choosing this product

The M114 combines compactness with reliability and ATEX/IECEx/UKEX certification. It offers flexible mechanical options and high accuracy across the entire travel range. The sensor is easy to integrate with galvanic isolation barriers and suits both 3-wire and 5-wire configurations, enabling accurate measurement even with long cables.

Other important features

  • Output range: 0.5–4.5 V ratiometric
  • Independent linearity: ±0.25% (≤450 mm), ±0.5% (>450 mm)
  • Operating temperature: –40 °C to +80 °C
  • Available with axial or radial cable gland
  • Compatible with Althen X005 galvanic isolation amplifier
  • No maintenance required

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.

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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.

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Technical Specifications

Specification Value
Body diameter 35 mm
Body length (Axial version) Calibrated travel + 168 mm
Body length (Radial version) Calibrated travel + 189 mm
Push rod extension Calibrated travel + 9 mm, OD 9.5 mm
Independent linearity ±0.25% FSO ≤ 450 mm, ±0.5% FSO > 450 mm
Frequency response >10 kHz (-3 dB)
Resolution Infinite
Noise < 0.02% FSO
Output 0.5–4.5 V ratiometric
Supply voltage +5 V (4.5–5.5 V)
Operating temperature –40 °C to +80 °C
Storage temperature –40 °C to +125 °C
Intrinsic safety ratings Ex I/II M1/1GD, Ex ia IIC T4 Ga, Ex ia IIIC T135°C Da, Ex ia Ma
Protection class IP68 10 bar / IP69K
Max working depth 100 m
Cable options Axial/radial, 3-core or 5-core, max. 150 m
Push rod types Captive, non-captive, spring-loaded, M5 thread, rod eye, dome, magnetic tip

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