Ring Torsion Load Cell: High-Precision Weighing up to 470 Tons
The RTN ring torsion load cell is available in a wide range of maximum capacities, from 1 t to 470 t. All versions are compact yet extremely robust. Thanks to these features and high protection ratings (up to IP68/IP69K), the RTN load cell is ideal for harsh environments, including container weighing, large platform scales, and vehicle scale applications.
HBM’s RTN load cells deliver exceptional precision and minimize the influence of lateral loads through their unique ring-shaped strain gauge design. Their high input resistance and low power consumption allow measurements using battery-powered evaluation devices.
Various special versions are available, including IECEx-ATEX certified and high-temperature versions (up to 110 °C), with selectable cable lengths and types. Additionally, the accuracy class 0.05 version offers an M12 connector option.
| Code | Type | Application | Maximum capacity | Accuracy class | Minimum verification interval (Vmin) | Material | Certification | Maximum platform size | Special feature |
|---|---|---|---|---|---|---|---|---|---|
| 1-RTN0.05/1T | Compression | Silo/Tank weighing | 1 t | 0.05 | — | Stainless steel with protective coating | — | n/a | None |
| 1-RTN0.05/2.2T | Compression | Silo/Tank weighing | 2.2 t | 0.05 | — | Stainless steel with protective coating | — | n/a | None |
| 1-RTN0.05/4.7T | Compression | Silo/Tank weighing | 4.7 t | 0.05 | — | Stainless steel with protective coating | — | n/a | None |
| 1-RTN0.05/10T | Compression | Silo/Tank weighing | 10 t | 0.05 | — | Stainless steel with protective coating | — | n/a | None |
| 1-RTN0.05/15T | Compression | Silo/Tank weighing | 15 t | 0.05 | — | Stainless steel with protective coating | — | n/a | None |
| 1-RTN0.05/22T | Compression | Silo/Tank weighing | 22 t | 0.05 | — | Stainless steel with protective coating | — | n/a | None |
| 1-RTN0.05/33T | Compression | Silo/Tank weighing | 33 t | 0.05 | — | Stainless steel with protective coating | — | n/a | None |
| 1-RTN0.05/47T | Compression | Silo/Tank weighing | 47 t | 0.05 | — | Stainless steel with protective coating | — | n/a | None |
| 1-RTN0.05/68T | Compression | Silo/Tank weighing | 68 t | 0.05 | — | Stainless steel with protective coating | — | n/a | None |
| 1-RTN0.05/100T | Compression | Silo/Tank weighing | 100 t | 0.05 | — | Stainless steel with protective coating | — | n/a | None |
| 1-RTN0.05/150T | Compression | Silo/Tank weighing | 150 t | 0.05 | — | Stainless steel with protective coating | — | n/a | None |
| 1-RTN0.05/220T | Compression | Silo/Tank weighing | 220 t | 0.05 | — | Stainless steel with protective coating | — | n/a | None |
| 1-RTN0.05/330T | Compression | Silo/Tank weighing | 330 t | 0.05 | — | Stainless steel with protective coating | — | n/a | None |
| 1-RTN0.05/470T | Compression | Silo/Tank weighing | 470 t | 0.05 | — | Stainless steel with protective coating | — | n/a | None |
| 1-RTNC3/1T | Compression | Silo/Tank weighing | 1 t | C3 | 50 g | Stainless steel with protective coating | OIML | n/a | None |
| 1-RTNC3/2.2T | Compression | Silo/Tank weighing | 2.2 t | C3 | 110 g | Stainless steel with protective coating | OIML | n/a | None |
| 1-RTNC3/4.7T | Compression | Silo/Tank weighing | 4.7 t | C3 | 235 g | Stainless steel with protective coating | OIML | n/a | None |
| 1-RTNC3/10T | Compression | Silo/Tank weighing | 10 t | C3 | 500 g | Stainless steel with protective coating | OIML | n/a | None |
| 1-RTNC3/15T | Compression | Silo/Tank weighing | 15 t | C3 | 750 g | Stainless steel with protective coating | OIML | n/a | None |
| 1-RTNC3/22T | Compression | Silo/Tank weighing | 22 t | C3 | 1100 g | Stainless steel with protective coating | OIML | n/a | None |
| 1-RTNC3/33T | Compression | Silo/Tank weighing | 33 t | C3 | 1650 g | Stainless steel with protective coating | OIML | n/a | None |
| 1-RTNC3/47T | Compression | Silo/Tank weighing | 47 t | C3 | 2350 g | Stainless steel with protective coating | OIML | n/a | None |
| 1-RTNC3/68T | Compression | Silo/Tank weighing | 68 t | C3 | 3400 g | Stainless steel with protective coating | OIML | n/a | None |
| 1-RTNC3/100T | Compression | Silo/Tank weighing | 100 t | C3 | 5000 g | Stainless steel with protective coating | OIML | n/a | None |
| 1-RTNC3/150T | Compression | Silo/Tank weighing | 150 t | C3 | 7500 g | Stainless steel with protective coating | OIML | n/a | None |
| 1-RTNC3/220T | Compression | Silo/Tank weighing | 220 t | C3 | 11000 g | Stainless steel with protective coating | OIML | n/a | None |
| 1-RTNC3/330T | Compression | Silo/Tank weighing | 330 t | C3 | 16500 g | Stainless steel with protective coating | OIML | n/a | None |
| 1-RTNC3/470T | Compression | Silo/Tank weighing | 470 t | C3 | 23500 g | Stainless steel with protective coating | OIML | n/a | None |
| 1-RTNC5/10T | Ring torsion | — | 10 t | C5 | 0.5 kg | Stainless steel with protective coating | OIML | — | — |
| 1-RTNC5/15T | Ring torsion | — | 15 t | C5 | 0.75 kg | Stainless steel with protective coating | OIML | — | — |
| 1-RTNC5/22T | Ring torsion | — | 22 t | C5 | 1 kg | Stainless steel with protective coating | OIML | — | — |
| 1-RTNC5/33T | Ring torsion | — | 33 t | C5 | 1.65 kg | Stainless steel with protective coating | OIML | — | — |
| 1-RTNC5/47T | Ring torsion | — | 47 t | C5 | 2.35 kg | Stainless steel, hermetically sealed | OIML | — | — |
| 1-RTNC5/68T | Ring torsion | — | 68 t | C5 | 3.4 kg | Stainless steel with protective coating | OIML | — | — |
| K-RTN | — | — | — | — | — | — | — | — | — |
Specifications
| Type | Compression, Ring torsion |
| Application | Silo/Tank weighing |
| Maximum capacity | 10 t, 15 t, 100 t, 150 t, 2.2 t, 22 t, 1 t, 220 t, 33 t, 470 t, 330 t, 4.7 t, 47 t, 68 t |
| Accuracy class | 0.05, C3, C5 |
| Degree of protection | IP68 |
| Material | Stainless steel with protective coating, Stainless steel, hermetically sealed |
| Maximum platform size | n/a |
| Output signal | Passive (mV/V) |
| Special feature | None |
| Minimum verification interval (Vmin) | 7500 g, 5000 g, 500 g, 50 g, 11000 g, 750 g, 110 g, 16500 g, 235 g, 1100 g, 1650 g, 23500 g, 2350 g, 3400 g, 0.5 kg, 0.75 kg, 1 kg, 1.65 kg, 2.35 kg, 3.4 kg |
| Certification | OIML |
Key Specifications
Maximum Capacity: 0…1 t up to 0…470 t
HBM Accuracy Class: up to C5
Protection Rating: IP68 (option: IP68/IP69K)
High Measurement Accuracy
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High precision and excellent signal-to-noise ratio due to 2.85 mV/V output signal
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Lateral load compensation achieved with ring-shaped strain gauge
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High input resistance (> 4,350 Ω) ensures low current consumption
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Suitable for legal-for-trade systems with up to 5,000 divisions according to OIML R60
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Excellent technical characteristics provide high accuracy
High Robustness
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Stainless steel construction prevents corrosion
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Resistant to chemicals and moisture
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Wide temperature range: -30 °C to +80 °C (option up to +110 °C)
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Explosion-proof version available (e.g., IECEx-AI 1/21)
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Optional braided cable
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Stainless steel construction, high protection rating, and explosion-proof design make it suitable for harsh environments
Easy Integration
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Compact design with low profile
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Optimized for parallel connection including eccentric load compensation
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Available in 14 maximum capacities and 3 sizes
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Various cable length options
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Connectors available (M12, not for legal-for-trade use)
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Also available as RTN/M weighing modules for easy mechanical integration
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Versatile use with different product versions and accessories
Enhanced Performance RTN
The RTN series of heavy-duty load cells, proven over decades, has been improved in its latest revision with enhanced performance and new options. For example, the 0.05 accuracy class version now offers a connector system. When used with the accessory connection cable (KAB175), the load cell automatically achieves IP68/69K protection when the connector is mounted. Additionally, the robust 6-wire cable is halogen-free.
