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Safe Level Monitoring in Hazardous Storage Zones


​In grain processing facilities, particularly milling operations, large volumes of grain, flour, or meal are handled daily. These materials generate fine dust, and when stored in confined silos, they create a high risk of dust explosions. Ensuring process safety in these conditions is complex: operators must prevent overfilling, detect material shortages early, and manage temporary overpressure during filling — all while meeting strict ATEX/IECEx regulations for Zone 20 and 21.

Explosion protection in grain storage

The Solution


Designed specifically for dusty, explosion-prone grain silos, this sensor system ensures safe and efficient operation by combining continuous level monitoring, point level detection, and visual status indication in one integrated solution. With ATEX/IECEx approvals for use in Zone 20/21 environments and a measuring range of up to 30 meters, it meets all key requirements for reliable level control in high-dust, high-risk applications — even under conditions of overpressure during silo filling.


  • NivoBob® NB 4200 provides reliable, continuous measurement — even in tall, dusty, or low-reflectivity silos.


  • Rotonivo® RN series delivers precise point level detection for overfill or empty alerts, with SIL 2 safety compliance.


  • NivoLED® NL 9000 offers 360° visual status indication — highly visible even in dust-heavy environments.


The system is easy to integrate into existing PLC or SCADA control architectures and designed for long-term operation with minimal maintenance.

Configure the right level monitoring system for your silo

Tell us a bit about your application — materials, silo type, and zone classification — and our team will recommend the optimal sensor setup for safe and efficient operation.

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Competitive pricing

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​NivoBob® NB 4200

Continuous level measurement for grain silo

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  • Measuring range up to 30 m
  • Reliable electromechanical operation, unaffected by dust or buildup
  • Integrated cable cleaning for minimal maintenance
  • Certified for Zone 20/21 (ATEX, IECEx

Rotonivo® RN 6001

Heavy-duty point level detection for standard grain silos

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  • Rotary paddle switch for full, empty, or demand detection
  • Designed for bulk materials with varying densities and flow behavior
  • Robust aluminum housing with process temperature range up to +110 °C
  • SIL 2 compliant and certified for Zone 20/21/22

Rotonivo® RN 3001 ​

Compact point level switch for small vessels and tight installations

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  • Shortened, space-saving construction for limited mounting conditions
  • Reliable detection of fine, dry, and lightweight materials
  • IP66/IP68-rated plastic housing for dust-tight and moisture-resistant performance
  • SIL 2 certified and ATEX-approved for Zone 20/21/22

NivoLED® NL 9000

360° visual status indication in explosive zones

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  • Dual-color LED indication for clear process feedback
  • PVDF housing with IP66/NEMA 4X protection — ideal for harsh environments ​
  • Certified for use in dust and gas zones (Zone 21 / Zone 2)
  • Simple mounting on silos, cabinets, or panels