Dakota NDT — T-101-3900 Dual-Element Transducer

7.5 MHz, 3/16 in Dual-Element Coating-Thickness Transducer, Potted Side Entry
SKU: T-101-3900

Overview

The Dakota NDT T-101-3900 is a compact 7.5 MHz dual-element ultrasonic thickness transducer featuring a 3/16 in probe diameter and permanently potted side-entry cable. Dakota identifies this configuration as a Coating Thickness / ThruPaint™ transducer, making it suitable for compatible thickness gauges designed to determine material thickness through coatings.

Its dual-element construction uses separate transmitting and receiving crystals within the same probe body. This configuration provides strong near-surface performance and is particularly useful for corrosion monitoring and remaining-wall measurements where access is available from only one side of the component.

The small 3/16 in contact area helps technicians inspect small-diameter piping, curved surfaces, restricted locations, and localized corrosion areas. Its relatively high 7.5 MHz operating frequency is well suited to applications requiring good resolution on suitable metallic substrates.

What's Included

Note: Ultrasonic thickness gauge, couplant, calibration standards, adapters, and other accessories are not included unless specified separately.

Box Dimensions & Shipping Weight (Estimated)

Actual shipping dimensions and weight may vary depending on cable length and packaging.

Key Specifications

Dakota's current transducer specification identifies T-101-3900 as the 7.5 MHz, 3/16 in, coating-thickness configuration with ThruPaint™ and potted side entry.

Performance Features

7.5 MHz Operating Frequency
Provides good ultrasonic resolution for thickness measurements on suitable industrial materials.

Dual-Element Construction
Uses separate transmitting and receiving elements to improve near-surface focusing and support corrosion thickness gauging.

3/16 in Compact Probe Diameter
The small contact footprint supports inspection of curved surfaces, small components, narrow locations, and localized corrosion areas.

Coating-Thickness Capability
Designed for use with compatible Dakota gauges capable of separating or compensating for coating thickness during material measurement.

ThruPaint™ Configuration
Supports compatible ultrasonic measurement workflows where removal of suitable surface coatings may not be necessary.

Potted Side-Entry Cable
Provides a permanently attached cable connection while routing the cable from the side of the transducer for convenient probe positioning.

User-Friendly Design

• Compact 3/16 in probe footprint

• Suitable for small-diameter and curved components

• Dual-element configuration supports corrosion monitoring

• Side-entry cable aids access in confined inspection locations

• Potted connection eliminates a detachable probe-side connector

• Suitable for spot measurements and manual scanning

• Supports compatible coating-thickness measurement modes

• Portable configuration for field inspection work

• Easy to integrate into compatible Dakota thickness-gauge systems

Built for Industrial Environments

• Designed for professional ultrasonic thickness measurement

• Suitable for fabrication, manufacturing, maintenance, and QA/QC

• Practical for piping, tanks, vessels, and structural components

• Compact probe supports restricted-access inspection areas

• Useful for recurring corrosion-monitoring programs

• Suitable for coated components when used with compatible instrumentation

• Fixed cable configuration supports field inspection workflows

• Intended for use with appropriate couplant and calibration procedures

Coating Thickness / ThruPaint™ Applications

When paired with a compatible Dakota thickness gauge, the T-101-3900 can support applications where protective coatings are present on the inspection surface.

Typical benefits may include:

• Reduced need to remove compatible coatings before measurement

• Faster corrosion-survey workflows

• Reduced surface preparation

• Ability to inspect painted piping and structures

• Improved efficiency during repeated monitoring programs

• Reduced damage to protective coating systems

Actual through-coating performance depends on the gauge, coating material, coating thickness, substrate, surface condition, and calibration procedure.

Compatibility

Compatible with:

• Dakota ultrasonic thickness gauges supporting dual-element probes

• Compatible Dakota instruments equipped with ThruPaint™ or coating-thickness functionality

• Instruments configured for 7.5 MHz transducers

• Corrosion-monitoring thickness modes

• Pulse-echo ultrasonic measurement procedures

• Appropriate ultrasonic couplants

• Known-thickness calibration standards

• Suitable ferrous and nonferrous metallic materials

• Field and laboratory ultrasonic inspection programs

Instrument model, connector configuration, cable length, measurement mode, coating type, substrate, and thickness range should be confirmed before ordering.

Ideal Applications

• Thickness measurement through compatible coatings

• Corrosion monitoring

• Remaining-wall evaluation

• Small-diameter piping inspection

• Pipeline inspection

• Storage-tank inspection

• Pressure-vessel inspection

• Boiler and heat-exchanger inspection

• Structural steel measurement

• Painted component inspection

• Localized corrosion surveys

• Erosion monitoring

• Preventive maintenance

• Fabrication QA/QC

• Asset-integrity programs

• Field ultrasonic testing

Typical Components Inspected

The T-101-3900 can be used on suitable components such as:

• Process piping

• Small-diameter tubes

• Storage tanks

• Pressure vessels

• Structural members

• Plates

• Machinery components

• Elbows and reducers

• Heat exchangers

• Boiler components

• Painted steel structures

• Coated industrial equipment

Inspection Guidelines

• Verify that the thickness gauge supports the selected transducer and coating-thickness mode

• Clean loose scale, dirt, and contamination from the measurement point

• Apply an appropriate ultrasonic couplant

• Calibrate the gauge for the material and inspection conditions

• Position the probe firmly against the inspection surface

• Maintain stable probe pressure

• Obtain a repeatable thickness reading

• Verify questionable readings with additional measurements

• Record inspection location and measured thickness

• Recalibrate periodically according to the written inspection procedure

Care and Handling

• Avoid dropping or striking the transducer

• Keep the probe face clean

• Remove couplant after inspection

• Inspect the probe face regularly for wear

• Check the potted cable transition for damage

• Avoid pulling the probe by the cable

• Do not sharply bend, pinch, or twist the cable

• Protect the probe from excessive heat unless specifically rated for elevated-temperature service

• Store in a clean, dry location

• Replace damaged probes when measurement reliability is affected

About Dakota NDT

Dakota NDT develops ultrasonic thickness gauges, flaw detectors, transducers, cables, couplants, and related accessories for professional non-destructive testing. Its ultrasonic solutions support corrosion monitoring, manufacturing, fabrication, maintenance, asset integrity, and industrial quality-control applications.