The BT2-DL from Dakota NDT is the top-of-the-range ultrasonic bolt tension monitor: more powerful and faster, it handles a wider range of lengths thanks to three measuring modes (Pulse-Echo, Echo-Echo, Echo-Echo-Verify) and expandable memory.
- Top-of-the-range bolt tension monitor : advanced functions and fast operation
- 3 measuring modes : Pulse-Echo, Echo-Echo, Echo-Echo-Verify
- Bolts up to 30.48 m : in Pulse-Echo mode
- 4 GB memory + 64 GB external : import/export with BT1-DL
- Outputs : analog, serial and alarm
- Li-Ion battery : ~18 h + AA backup
- Industries : aerospace, energy, infrastructure, railways
The BT2-DL measures bolt tension (elongation, load, stress, strain, time in ns) with three modes: Pulse-Echo for uncoated fasteners up to 30.48 m and Echo-Echo / Echo-Echo-Verify (triple echo) for small fasteners where coating thickness could affect the measurement (up to about 102 mm).
Auto-correlation assists transducer positioning and custom auto-calibration simplifies setup. It offers 4 GB of internal memory expandable up to 64 GB, analog, serial and alarm outputs, USB connectivity and the ability to import and export files with the BT1-DL.
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Technical specifications
| Feature | Value |
| Instrument type | Ultrasonic bolt tension monitor (top of the range) |
| Measured quantities | Elongation, load, stress, percentage of strain, time (nanoseconds) |
| Measurement modes | Pulse-Echo, Echo-Echo, Echo-Echo-Verify (triple echo) |
| Pulse-Echo range | uncoated bolts up to 30.48 m (100 ft) |
| Echo-Echo range | up to about 102 mm (4 in) for small fasteners |
| Functions | Auto Correlation, Auto Set, custom auto-calibration, 3 gates |
| Setups | 64 customisable setups |
| Memory | 4 GB internal, expandable up to 64 GB external |
| Outputs / connectivity | USB 1.1; analog, serial and alarm outputs; import/export with BT1-DL |
| Software | PC and OSX for reporting |
| Power supply | 10.8 V 2 Ah Li-Ion pack (~18 h); 6 × AA backup (alkaline ~12 h) |
| Operating temperature | −10 … +60 °C |
| Dimensions | 216 × 165 × 70 mm |
| Weight | approx. 2.04 kg (4.5 lb, with batteries) |
| Housing | Extruded aluminum with nickel-plated aluminum end caps (sealed gaskets) |
Part numbers, accessories and spare parts
Part numbers for ordering the BT2-DL and its accessories. The part numbers will be added as soon as they are available.
Instrument – complete kit
| Item code | Product code | Description |
| — | BT2-DL | BT2-DL top-of-the-range ultrasonic bolt tension monitor |
Accessories
Photo
Item code
Product code
Description
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Bolt transducer
Single-element transducer (1–10 MHz, diameters 1/8”–1”); glue-on version for short bolts
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Couplant
Coupling gel for ultrasound transmission
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Carrying case
Carrying case for the instrument and its accessories
Technical documentation
| Document | Type |
| BT2-DL datasheet | Datasheet (PDF) |
| BT2-DL manual | Manual (PDF) |
Frequently asked questions
The BT2-DL is the top-of-the-range model: it adds the Echo-Echo and Echo-Echo-Verify modes, handles longer bolts (up to 30.48 m in Pulse-Echo), has memory expandable up to 64 GB and analog, serial and alarm outputs.
Pulse-Echo for uncoated fasteners up to 30.48 m and Echo-Echo / Echo-Echo-Verify for small coated fasteners (up to about 102 mm).
Yes: it allows files to be imported and exported between the BT2-DL and the BT1-DL.
With a Li-Ion battery pack (10.8 V, 2 Ah, ~18 h of runtime) and an emergency 6 × AA backup.
Contacts & Information
Contact for general information : info@roder.it
Machine Vision Division of RODER : www.visiotronix.com
RODER Instruments Division : www.innovacheck.com
More about RODER : about us
The information contained in this website is provided for information purposes only. Although it has been prepared with the greatest care, it does not constitute a contractual offer or a binding commitment to supply. It may contain transcription, translation or typographical errors. For precise and up-to-date information, please contact our company directly.
Note: Some images on this website have been intentionally generated using artificial intelligence (AI). This is because, for many applications and projects, photographs of the actual installation or system cannot be disclosed owing to confidentiality agreements, contractual clauses and non-disclosure agreements (NDAs).
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