FX Series — Ultrasonic Flaw Detectors
Portable for field use
Dakota FX70-DL / FX71-DL – Portable Flaw Detector
The portable model of the range, optimised for field inspections, hard-to-reach positions and maintenance of in-service components.
- Part Number Z-221-0005 (designation DFX-7+)
- Weight 397 g, dimensions 63.5 × 165 × 31.5 mm
- Power supply 3 × AA, 12 hours of operation
- Detection modes Zero Crossing, Flank, Peak, TRIG, DAC, TCG
- 4 GB memory with A-Scan and B-Scan; compliant with EN 12668-1
Benchtop for the laboratory
Dakota FX81-DL – Benchtop Flaw Detector
The laboratory model, suited to QC labs, NDT training centres and in-production inspections, with the same detection modes as the portable.
- Part Number Z-251-0001 (designation DFX-8+)
- Weight 2.04 kg, dimensions 216 × 165 × 70 mm
- Power supply 6 × AA (12 hours) or via USB for continuous use
- Detection modes Zero Crossing, Flank, Peak, TRIG, DAC, TCG
- 4 GB memory with A-Scan and B-Scan; compliant with EN 12668-1
The Dakota NDT ultrasonic flaw detectors are 2-in-1 instruments that combine advanced flaw inspection features with thickness measurement capability on a single platform. Designed for certified NDT operators who need to detect, locate and characterise cracks, weld defects, discontinuities, they include all the detection modes required by the main international standards: Zero Crossing, Flank, Peak, TRIG for 2D location with angle beam probes, DAC for Distance Amplitude Correction, TCG for automatic Time Corrected Gain. Both models in the catalogue are compliant with EN 12668-1, the European reference standard for ultrasonic flaw detection equipment, with 4 GB memory for storing A-Scan and B-Scan in alphanumeric batches.
Instrument selection guide
Not familiar with the Dakota Flaw Detector range? Identify your use case and we will point you to the recommended model. For requirements outside these profiles, we remain at your disposal through the contact details on the Contact page.
Site inspections, civil works, suspended structures
Portable field testing on welds, plate and sections. Rugged instrument, battery powered, quick interface for mobile inspections.
Recommended model: Dakota FX70-DL / FX71-DL
Laboratory, production, stationary inspections
Quality control on series-produced components, batch inspection, repetitive testing. Benchtop instrument with high measurement stability and a large display.
Recommended model: Dakota FX81-DL
Need help choosing the right product?
FX70-DL vs FX81-DL comparison
| Feature | FX70-DL / FX71-DL | FX81-DL |
| Part Number | Z-221-0005 | Z-251-0001 |
| Form factor | Portable | Benchtop |
| Weight | 397 g | 2.04 kg |
| Dimensions | 63.5 × 165 × 31.5 mm | 216 × 165 × 70 mm |
| Batteries | 3 × AA (12h) | 6 × AA (12h) + USB |
| Detection modes | Zero Crossing, Flank, Peak, TRIG, DAC, TCG (identical) | |
| Memory | 4 GB with A/B-Scan for every measurement | |
| Compliance | EN 12668-1 | |
| Ideal scenario | Field inspections, maintenance | Laboratory, production, training |
The detection modes: quick guide
Zero Crossing
Standard mode: measures at the first crossing of the X axis after the trigger gate. Stable against amplitude variations.
Flank
Triggers on the flank of the pulse: maximum time resolution.
Peak
Measures at the signal peak: ideal for identifying maximum echoes.
TRIG (Trigonometric)
For angle beam probes: calculates the surface distance and depth of the flaw by applying trigonometry to the beam path. Automatic correction for curved surfaces.
DAC (Distance Amplitude Correction)
Sensitivity curves against distance for flaw size classification to AWS/ASME/ISO criteria.
TCG (Time Corrected Gain)
Automatic compensation of attenuation with depth.
Typical applications
Welds and structural steelwork
Inspection of structural welds to AWS D1.1, ISO 17640 and ASME Sect. V, and detection of fatigue cracks in welded structures.
In-service plant and predictive maintenance
Pressure vessels, piping and heat exchangers; power generation on turbines, rotors and critical components; marine sector on hulls and offshore platforms; infrastructure such as road and rail bridges, pylons and dams.
Production, laboratory and training
Quality control of castings, forgings and plate in production; aerospace structural components; axles, wheels and rolling stock elements in the rail sector; NDT training centres for Level I/II/III operators.
Probes for flaw inspection
TR (Transmit/Receive) probes are also available for specific applications. Working frequencies are 1, 2, 4, 5 and 10 MHz depending on the application.
Reference standards
- EN 12668-1 — ultrasonic flaw detection equipment (declared compliance)
- EN ISO 17640 — ultrasonic testing of welds: techniques, testing levels, assessment
- AWS D1.1 — Structural Welding Code Steel
- ASME Sect. V — Nondestructive Examination
- NIST-traceable factory calibration and MIL-STD-45662A
- Thickness gauge mode compliant with EN 14127 and ASTM E797
DakMaster™ software
Both models are supplied with the DakMaster™ software to download, store and analyse measurements. FX70-DL and FX81-DL data are fully interoperable — enabling integrated workflows between field inspection and laboratory analysis with a single technical archive. Further reading: DakMaster™: how to manage and store NDT measurements on a PC.
Application guides from the blog:
- AWS D1.1 and ultrasonic weld inspection: requirements and instruments
- Ultrasonic weld inspection to AWS D1.1 with the Dakota FX70-DL
- How to choose the right ultrasonic transducer
- Data logger vs manual recording
Do you need a flaw detector?
We help you size the right instrument and choose the optimal probe set for your welds or components. We also offer certified operator training. Contact us for dedicated technical advice.
Further information and contacts
Systems division and sensor integration partner : www.roder.it
More information about RODER SRL : about us
Contact for general information : info@roder.it
Contact for information about these products : info@roder.it
The information contained on this web page is provided for information purposes only. Although it has been compiled with the utmost 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.
Some images on this website have been intentionally generated using Artificial Intelligence (AI). This is because, for many applications and projects, it is not possible to disclose photographs of the installation or of the actual system due to confidentiality agreements, confidentiality clauses and non-disclosure agreements (NDAs).