Dakota NDT R9 Sonic Tester | Ultrasonic Thickness Gauge

Introduction to R9 Sonic Testing Technology

The Dakota R9 Sonic Tester is a rugged and precision-engineered ultrasonic thickness gauge designed for challenging measurement environments where only one side of the material is accessible. Developed with the racing industry in mind, the R9 offers advanced sonic testing capabilities to accurately determine material thickness, including complicated internal geometries such as engine cylinder walls and head ports. Its ultrasonic technology enables reliable detection of thinning, wear, corrosion, and unseen defects in a variety of materials without the need for destructive inspection methods. 

Dakota R9 Sonic Tester – Instruction Manual

Dakota R9 Sonic Tester (PR-9) Datasheet

Core Measurement Technology

At the heart of the R9 is its dual-element transducer system. Dual elements send and receive ultrasonic pulses, allowing for excellent performance on curved surfaces, blind areas, and irregular geometries that would normally challenge conventional thickness gauges. This makes the R9 ideal for measuring cylindrical and tubular sections where reflections and echo errors are common. 

The device measures material thickness from 0.63 mm up to 914.4 mm (0.025 to 36.00 in) — a range that covers most industrial components from thin sheets to heavy structural parts. The sonic velocity range (305 to 18,542 m/s) accommodates a wide variety of materials including metals, composites, plastics, and internally corroded surfaces. 

High-Speed Scan for Efficiency

A standout feature of the R9 is its high-speed scanning mode, capable of capturing up to 100 readings per second. This allows inspectors to rapidly sweep over a surface — for example, along the wall of a cylinder — and automatically record the minimum thickness value found during the scan. This feature dramatically speeds up inspection cycles on repetitive or large surface areas — a critical advantage for racing engine builders and industrial NDT teams alike. 

Calibration Options for Precision

The R9 supports three material calibration modes to enhance measurement accuracy:

• Single point calibration, ideal for basic setups

• Two point calibration, for more complex materials

• Target velocity calibration, for custom material velocity adjustments

  These options give the user flexibility to optimize the gauge for specific materials, thickness ranges, and environmental conditions, ensuring reliable results across diverse applications. 

Display & User Interface

The R9 features a high-visibility display with selectable units (mm/inches), and user-selectable LED backlighting that enhances readability in bright or low-light environments. Repeatability and stability indicators help confirm consistent measurement during scanning. 

Rugged Construction for Field Durability

Built for field usage, the Dakota R9 includes a gasket-sealed aluminum housing that resists environmental contaminants and withstands tough industrial conditions. It operates reliably in temperatures from -30 °C to +75 °C (-22 °F to 167 °F) — making it suitable for workshop floors, engine bays, metal fabrication shops, and outdoor inspection scenarios. 

Power & Portability

The gauge is powered by two AA batteries, offering up to 45 hours of operation with alkaline cells and approximately 23 hours with NiCad cells, enabling long inspection shifts without frequent battery changes. 

Factory Calibration & Warranty

Each R9 unit leaves the factory with calibration traceable to NIST and MIL-STD-45662A standards, providing assurance of measurement accuracy and quality. Dakota backs this precision tool with a 5-year limited warranty, reflecting confidence in long-term performance and reliability. 

Advanced Applications & Use Cases

Automotive & Racing NDT

The R9’s precision and high-speed scan capabilities make it invaluable for automotive and racing teams. It is widely used for:

• Measuring engine cylinder wall thickness to assess wear before boring or rebuilding

• Inspecting head ports and combustion chambers for unseen thinning or corrosion

• Evaluating chassis tubing and roll cages, where material integrity is critical for safety and performance. 

Industrial Inspection & Quality Control

Beyond racing, the R9 excels in industrial nondestructive testing programs:

• Manufacturing quality control — verifying material thickness during fabrication

• Corrosion inspection — identifying thinning due to chemical attack or erosion

• Maintenance planning — establishing baseline thickness for trend analysis

• Structural integrity checks in shipbuilding, pipeline fabrication, and metalworks. 

Specialized Material Challenges

Some materials — such as composites, cast structures, and internally corroded metals — pose significant challenges due to poor sound transmission. The Dakota R9, classified in Dakota’s speciality gauge range, is engineered specifically to handle these difficult-to-penetrate materials with confidence. 

Frequently Asked Questions (Extended)

What thickness ranges does the Dakota R9 measure accurately?

It measures from 0.63 mm to 914.4 mm (0.025 to 36.00 in) depending on the probe and material type. 

How does the high-speed scan mode help inspectors?

The high-speed scan captures up to 100 readings per second, automatically identifying the minimum thickness during a continuous sweep, saving significant inspection time. 

Can the R9 measure curved surfaces and complex geometries?

Yes — its dual-element transducer and calibration modes provide enhanced accuracy on curved, tubular, and irregular surfaces. 

Is the R9 suitable for composite materials?

Yes — Dakota ultrasonic gauges are designed to handle a range of materials including metals, composites, plastics, and internally corroded substrates. 

What industry standards does it meet?

Factory calibration is traceable to NIST & MIL-STD-45662A, aligning with rigorous industrial metrology standards. 

What accessories are available for the R9?

Optional accessories include specialized dual-element probes tailored for cast iron, aluminum, tubing, and other specific inspection needs (sold separately). 

How long does the gauge operate between battery changes?

Up to 45 hours with alkaline batteries and about 23 hours with NiCad cells. 

Summary

The Dakota R9 Sonic Tester is a versatile, high-performance ultrasonic thickness gauge built for industrial and racing applications requiring precise material assessment with limited access. With advanced scanning, multiple calibration options, rugged construction, and wide material compatibility, the R9 stands as a core tool for nondestructive testing professionals. 

Call to Action

Request a quote for the Dakota R9 Sonic Tester and enhance your inspection and ultrasonic thickness measurement capabilities. Contact Seven Star LLC for pricing, availability, accessories, and technical support.