RTN Ring Torsion Load Cells: Precise Weighing up to 470 Tons

Different RTN ring torsion load cell versions are available for a wide range of maximum capacities (up to 470 tons) and feature very low height. They are well-suited for any type of container weighing task as well as for large platform scales. Typical applications include the construction of truck scales. Unlike other load cells of this type, RTN load cells – due to the use of unique ring-shaped strain gauges – significantly minimize the effects of transverse and lateral loads.

Their high input resistance and low power consumption enable battery-powered evaluation units to be used for taking measurements. The high-temperature version that is available as an option (up to 110 °C) is well-suited for use in the foundry technology. The RTN can be used in extremely moist conditions as well as outdoors, due to its high IP68/IP69K degree of protection. IECEx-ATEX versions are available for use in areas with potentially explosive atmospheres.

  • Maximum capacity: 1 t to 470 t
  • Accuracy class: up to C3
  • Degree of protection: IP68/IP69K

High measurement accuracy

  • High precision and high signal-to-noise ratio, due to the 2.85 mV/V output signal
  • Excellent compensation of transverse loads, due to special design and use of ring-shaped strain gauges
  • High input resistance (> 4,350 ohms) ensures low current consumption
  • Legal-for-trade weighing system of up to 3,000 d (OIML R60)

High precision – thanks to outstanding technical properties

High robustness

  • Wide temperature range from -30 °C to +80 °C (optionally up to +110 °C)
  • Measuring body made of stainless steel
  • Resistance to chemicals
  • Large cable cross-section for low temperature influence
  • Explosion-proof versions available (e.g. IECEx-AI 1/21)
  • Optional: Halogen-free cable for use in critical areas
  • Optional: Resistant to permanent moisture, due to IP69K degree of protection

Ideal for harsh environments – due to stainless steel design, high IP68 (optionally: IP69K) degree of protection, and explosion protection.

Wide range of applications

  • Very low height
  • Optimized for parallel connection including off-center load compensation
  • 14 maximum capacities available
  • Different cable lengths and cable types available
  • Also available as a complete RTN/M weighing module, for easy mechanical integration

Flexible use in many applications – due to various product variants and accessories

Extensive range of accessories available

  • Elastomer mounts
  • Pendulum mounts

Available options: 

  • Explosion-proof versions according to different standards
  • Different cable lengths and cable types
  • Service temperature range up to +110°C 
  • Also available as weighing module RTN/M

For more information, please refer to the data sheet.

Product Literature

Title / DescriptionLanguage
Data Sheets
Mounting Instructions
French, German, English
English, German
Declaration of Conformity
Explosion Protection: Declaration of Conformity

Ex IIG for zone 1 and Ex IID for zone 21


Ex IIG for zone 2 and Ex IID for zone 21


Ex I M1


Explosion Protection: Safety Instructions

I M1 Ex ia I Ma


English, German, Spanish, French, Italian, Portuguese

II 2G Ex ia IIC T6/T4 Gb / II 2D Ex ia IIIC T125°C Db

English, German, Spanish, French, Italian, Portuguese

II 3G Ex ec IIC T6/T4 Gc / II 2D Ex tb IIIC T125°C Db

English, German, Spanish, French, Italian, Portuguese
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