Criterion NDT


Criterion specializes in Eddy Current testing equipment instruments and coils. They offer the CR-11 which is a highly capable industrial touch screen instrument with latest software designed for the needs of Crack inspection testing. The ST-11 is similar to the CR-11 except the software is for Heat Treatment and material structural testing. The latest version of the ST-11 is the ST-11R which separates the operator interface screen from the instrument processor so user can panel mount the screen and locate the processor in an electrical panel. Criterion offers both standard tooling for crack testing probes and coils for heat treat testing as well as thread inspection probes. In applications where multiple coils and special geometry in the coil design is needed Criterion has full capability for custom design and build of eddy current probe and coil tooling.

Crit Feat ST-11 Machine IMG

Key Product Lines

CR-11 Eddy Current Test Instrument

Criterion NDT’s CR-11 single channel eddy current test instrument is specifically designed to find material defects such as cracks and flaws in components during production processes – in real-time. This helps you to quickly detect and separate flawed product, reducing scrap and warranty costs.The CR-11 comes with a rugged, easy-to-use touch screen user interface which makes set up and operation quick and easy. Its rugged aluminum case and full industrial I/O make it perfect for on-line, industrial environments.

Standard EC Tooling

The Criterion NDT ST-11 is multi-frequency material structure test instrument. It was developed to quickly identify and sort product with improper heat treatment and material mix issues.
Users can also setup the ST-11 for thread testing as well as some product assembly verification applications.
In the heat treatment process there can be many process problems; Issues such as clogged quench nozzles, loose tooling/fixturing, bent induction coils, incorrect heating cycles, power outages are the most common. These issues can result in hardness, case depth and case pattern issues that are out of specification and can be immediately detectable with the ST-11 on your production line.
An industry leading user interface, coupled with our unique Setup Assist feature, ensures all levels of production personnel can quickly establish ST-11 testing configurations and easily understand the test results. The ST-11’s Industrial I/O provides the handshaking required to seamlessly work with today’s automation systems.

ST-11 Material Structure, Alloy, Thread and Assembly Verification Test Instrument

The InSite HT and InSite CT are multi-channel, multi-frequency eddy current instruments. They are both designed to operate at full production line speeds in tough manufacturing environments. Both the InSite HT and InSite CT are available in 2, 4, and 8 channel versions.The InSite HT eddy current instrument helps you to identify improper heat treatment conditions such as shallow case depth, short heat, misplaced case, delayed quench, short quench, air-cooled, or no heat treatment. The InSite HT can be used to test for proper heat treatment on simple parts such as ball bearings and fasteners, as well as on complex components such as gears, wheel bearings, and axles. The automated eight-frequency, multi-channel test set-up allows for simultaneous inspection for multiple anomalies on a single component.

The InSite CT works with Criterion NDT’s custom probes allowing for testing of complex geometries such as bearings, gears, axles, pistons, and tubing.

Standard Pencil Probes
Standard crack and flaw pencil probes are often used where there is easy access to the defect. These probes are designed to minimize noise. They are made with stainless steel housings and can be designed with ceramic or stainless steel tips for improved wear resistance.
Standard Eddy Current Encircling Coils

Standard heat treat and material structure encircling coils are built using a single drive coil and multiple receive coils. High wear inserts can be made from ceramic or stainless steel materials depending on the application needs.Optional coil handles are also available to simplify replacement in high wear environments such as bar, tube, and wire inspection.

Custom Probes and Probe Fixturing
Criterion NDT’s custom probes and probe fixturing are manufactured to fit unique applications and requirements. Our engineers design these probes to fit the specific part under test as closely as possible in order to maximize signal response.
Criterion NDT Sorting Unit

Criterion NDT’s new CSU material sorting unit provides manufacturers the ability to remove defective components from either in-line or off-line production processes by utilizing eddy current test results. Sorting parts by heat treatment conditions, alloy selection or assembly criteria saves time and unnecessary downstream processes resulting in cost savings. The CSU works with all Criterion NDT products.The sorter is scalable to accommodate many product types and sizes, at rates of one or more parts per second. Bolt-on feeding guides and directional output chutes are easily attached.

Simple sorting stations can also be hand fed off-line and use gravity feed into single or multiple coils.

Criterion NDT works with material handling companies around the world to properly integrate eddy current systems into production lines. All of our test instruments are designed with industrial I/O that communicate to interface with PLCs used to control production lines.Successful material handling systems must ensure that:

The eddy current sensor (coil or probe) is in close proximity to the part under test, and the positioning is repeatable in order to maximize test results and minimize false rejects.
For heat treatment verification (structure) testing, encircling coils are most often used. A coil can either surround the exterior of the part or be inserted within the part to access the critical test area.
For a proper crack and flaw test, the probe is swept over the area to be tested. In most cases, the part is rotated or moved relative to the sensor. For the vast majority of crack inspection applications, it is critical that either the sensor or the part is moving relative to one another.

About Criterion NDT


Criterion NDT is located in Auburn WA. In between Seattle and Tacoma. The company was formed in the early 2000’s as a talented group spun off from a much larger NDT company with equipment and applications more focused on component part manufacturing NDT needs. Criterion NDT staff are experts in the use of Eddy Current NDT technology used as a means to detect cracks, material and part mixed problems and heat treatment process problems. They are a global company with representation partners on every continent. Their instruments and tooling represent the best most capable versions of their technology found in the industry

Related Resources

Sign Up for our Newsletter

Stay up to date on upcoming events and product launches.


Speak to one of our experts today!