M111 Rugged stand-alone linear position sensor
Reliable position measurement in harsh and hazardous environments. Built for durability and precision with ATEX/IECEx/UKEX approval.
Key features
- Intrinsically safe for mining and hazardous areas (Ex I/II M1/GD)
- Heavy-duty 12.6 mm push rod and stainless-steel housing
- Measurement ranges from 0–5 mm to 0–800 mm
- Sealing to IP67 and temperature range from –40 °C to +80 °C
- Infinite resolution and high linearity up to ±0.25% FSO
- Wide selection of mechanical mounting and electrical connection options
Performance highlights
The M111 sensor delivers high precision and robust performance in extreme environments. It features a heavy-duty design with a larger 12.6 mm stainless steel push rod, making it ideal for vibration-intensive applications or longer measurement strokes. The sensor provides a linear analogue output (0.5–4.5 V ratiometric) and infinite resolution, with excellent repeatability and low noise.
Usage conditions
With ATEX / IECEx / UKEX approval and Ex I/II M1/GD classification, the M111 is designed for use in potentially explosive gas and dust atmospheres, including mining. It operates reliably from –40 °C to +80 °C, and is sealed to IP67 to withstand demanding industrial settings. The sensor can be used with cable lengths up to 1000 metres (with galvanic isolation), and is available with either three-wire or five-wire configurations.
Possible applications
- Underground and surface mining equipment
- Industrial process monitoring
- Scientific test rigs
- Linear displacement control in ATEX zones
- Position sensing in hazardous dust and gas environments
Advantages of choosing this product
The M111 offers the benefits of non-contact inductive sensing with no mechanical wear, ensuring long service life and minimal maintenance. Its compact size, rugged housing and multiple output and mounting configurations make it easy to integrate into space-constrained systems. With custom-calibrated travel lengths and intrinsic safety, it’s a dependable choice for high-risk environments.
Other important features
- Stainless steel body and rod construction
- Optional sprung push rod, magnetic tip, dome end, or rod-eye
- Certified for use with up to 1000 m of cable
- Compatible with Althen X005 galvanic isolation amplifier
- Meets EMC standards: EN 61000-6-2, EN 61000-6-3
- Shock resistance up to 40 g, vibration up to 10 g
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.
Talk to an expertTechnical Specifications
| Specification | Value |
|---|---|
| Body diameter | 35 mm |
| Body length (axial) | Calibrated travel + 163 mm |
| Body length (radial) | Calibrated travel + 186 mm |
| Push rod diameter | 12.6 mm |
| Travel range | 0–5 mm to 0–800 mm |
| Independent linearity | ≤ ±0.25% FSO @ 20 °C (up to 450 mm), ≤ ±0.5% FSO @ 20 °C (over 450 mm) |
| Temperature coefficients | < ±0.01%/°C Gain, < ±0.01%FS/°C Offset |
| Resolution | Infinite |
| Noise | < 0.02% FSO |
| Frequency response | > 10 kHz (–3 dB) |
| Sealing | IP67 |
| Operating temperature | –40 °C to +80 °C |
| Storage temperature | –40 °C to +125 °C |
| Shock | 40 g (IEC 68-2-29) |
| Vibration | 10 g (IEC 68-2-6) |
| MTBF | 350,000 hrs @ 40 °C |
| Supply voltage | +5 VDC (4.5–5.5 V) |
| Output | 0.5–4.5 V ratiometric |
| Intrinsic safety | Ex I/II M1/GD, Ex ia IIC T4 Ga, Ex ia IIIC T135°C Da, Ex ia I Ma |
| Cable length | Up to 1000 m (with galvanic barrier) |
| EMC compliance | EN 61000-6-2, EN 61000-6-3 |
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