1. Althen Sensors
  2. Sensors
  3. Linear position sensors
  4. Intrinsically safe position sensors
  5. M101 Stand-alone linear position sensor

M101 Stand-alone linear position sensor

Intrinsically safe linear position sensor with compact stainless steel housing, ideal for mining and other hazardous applications. Offers precise, contactless measurement with long-term stability.


Key features

  • Intrinsically safe for mining environments
  • Custom stroke length from 5 mm to 800 mm
  • Durable stainless steel body and push rod
  • IP67 sealing for harsh conditions
  • Infinite resolution with low noise
  • Wide operating temperature range (-40 °C to +80 °C)

Performance highlights

The M101 delivers linear, non-contacting measurement with outstanding accuracy and infinite resolution. Thanks to its rugged stainless steel housing and integrated EMC protection, the sensor ensures high performance even in harsh industrial environments. It supports custom-calibrated travel lengths from 5 mm to 800 mm and is compatible with both 3- and 5-wire connection modes to maintain signal integrity over long cable runs.

Usage conditions

With ATEX / IECEx / UKEX certification for gas, dust, and mining environments, the M101 operates safely in zones 0, 20, and mining group I areas. The sensor can withstand vibration up to 10 g and shock up to 40 g, making it highly suitable for dynamic conditions. It features sealing up to IP67 and operates in temperatures from -40 °C to +80 °C.

Possible applications

  • Underground mining equipment
  • Industrial automation in explosive zones
  • Hydraulic and pneumatic actuators
  • Mobile machinery
  • Material testing systems

Advantages of choosing this product

The M101 combines space-efficient design with outstanding measurement precision. It’s easy to integrate, customizable, and compatible with a wide range of installation options. It is designed to last in hazardous settings while minimizing maintenance downtime thanks to its wear-free inductive sensing technology.

Other important features

  • Captive or free push rod with M5 thread, rod eye or magnetic tip
  • Spring-loaded option for short strokes (up to 300 mm)
  • EMC-compliant and shock/vibration resistant
  • Approved for cable lengths up to 1000 m
  • Compatible with X005 galvanic isolation amplifier

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
Stroke length 5 mm to 800 mm (customer-defined)
Body length (axial version) Stroke + 163 mm
Body length (radial version) Stroke + 186 mm
Push rod extension Stroke + 9 mm, OD 9.5 mm
Independent linearity ≤ ±0.25% FSO (≤450 mm), ≤ ±0.5% FSO (>450 mm)
Temperature coefficients < ±0.01%/°C Gain & < ±0.01%FS/°C Offset
Frequency response >10 kHz
Resolution Infinite
Noise < 0.02% FSO
Operating temperature -40 °C to +80 °C
Storage temperature -40 °C to +125 °C
Intrinsic safety rating Ex I/II M1/GD; Ex ia IIC T4 Ga; Ex ia IIIC T135°C Da; Ex ia I Ma
Intrinsic safety approvals SIRA 13ATEX2371X, IECEx SIR 13.0154X, CSAE 21UKEX2537X
Input parameters (connector) Ui: 11.4V, Ii: 0.20A, Pi: 0.51W, Ci: 1.16µF, Li: 50µH
Input parameters (cable) Ci: 1.36µF, Li: 860µH with 1km max cable
Sealing IP67

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