Dakota NDT — T-042-1000 Dual-Element High-Temperature Transducer

2.25 MHz, 1/4 in, Highly Damped, High-Temperature Dual-Element Transducer, Potted Top Entry, Rated up to 650°F
SKU: T-042-1000

Overview

The Dakota NDT T-042-1000 is a specialized 2.25 MHz dual-element ultrasonic transducer designed for thickness measurement and corrosion monitoring on elevated-temperature components. Its high-temperature construction allows inspections on surfaces reaching temperatures up to approximately 650°F (343°C), making it suitable for applications where equipment cannot be cooled or taken out of service before inspection.

The transducer incorporates a 1/4 in dual-element configuration, using separate transmitting and receiving elements to improve near-surface response and measurement performance on corroded, eroded, or rough industrial surfaces. Its relatively small contact footprint also supports access to restricted areas and curved components.

A highly damped design helps control pulse duration and improve resolution, while the 2.25 MHz frequency provides useful penetration for demanding industrial thickness-gauging applications. The permanently potted cable enters from the top of the probe, providing a secure connection for field and maintenance inspection work.

What's Included

Note: Ultrasonic thickness gauge, high-temperature couplant, calibration blocks, 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

Temperature Capability

Actual allowable contact time at maximum temperature depends on the inspection procedure, couplant, probe condition, surface condition, and temperature exposure.

Performance Features

High-Temperature Capability
Designed for ultrasonic measurements on hot surfaces with temperatures reaching approximately 650°F, reducing the need to shut down or cool equipment solely for thickness inspection.

2.25 MHz Operating Frequency
Provides strong acoustic penetration for industrial thickness measurements and can be useful on attenuative, corroded, or elevated-temperature materials.

Dual-Element Configuration
Separate transmitting and receiving crystals improve near-surface performance and help provide reliable measurements on components affected by corrosion or erosion.

1/4 in Contact Area
The compact element size supports measurement on small-diameter piping, curved components, restricted areas, and localized corrosion zones.

Highly Damped Construction
Helps shorten the ultrasonic pulse and improve resolution between closely spaced echoes.

Potted Top-Entry Cable
Provides a permanently secured cable connection while keeping the cable routed from the top of the transducer.

User-Friendly Design

• Compact 1/4 in probe footprint

• Suitable for curved and restricted-access surfaces

• Dual-element design optimized for corrosion-monitoring applications

• Highly damped response supports accurate thickness measurements

• Potted cable eliminates a detachable probe-side connector

• Top-entry cable provides straightforward probe handling

• Compatible with portable ultrasonic inspection workflows

• Suitable for spot measurements and corrosion-mapping programs

• Designed for elevated-temperature field inspections

Built for High-Temperature Industrial Environments

• Suitable for operating process equipment

• Designed for inspection of hot piping and vessels

• Practical for refineries and petrochemical facilities

• Supports power-generation maintenance programs

• Suitable for chemical processing plants

• Useful during shutdown avoidance and online inspection programs

• Supports recurring corrosion-monitoring measurements

• Compact configuration assists with limited-access inspection points

• Fixed cable construction supports demanding field use

• Intended for use with appropriate high-temperature couplants and procedures

High-Temperature Inspection Considerations

When performing measurements at elevated temperatures:

• Use an ultrasonic couplant rated for the actual surface temperature

• Calibrate the instrument for the material and expected temperature range

• Account for changes in ultrasonic sound velocity caused by temperature

• Minimize unnecessary probe contact time on extremely hot surfaces

• Allow the transducer to cool between readings when required

• Follow the probe manufacturer's recommended duty cycle

• Monitor the probe face and cable for heat-related deterioration

• Maintain consistent coupling pressure during measurement

• Use suitable personal protective equipment around hot components

• Follow the facility's hot-work and process-safety requirements

Measurements performed at elevated temperatures may require correction because sound velocity in the inspected material changes with temperature.

Compatibility

Compatible with:

• Dakota NDT ultrasonic thickness gauges supporting dual-element probes

• Instruments configured for 2.25 MHz transducer operation

• High-temperature corrosion-monitoring modes

• Pulse-echo ultrasonic thickness measurement

• High-temperature ultrasonic couplants

• Appropriate calibration blocks and reference standards

• Carbon steel and other suitable industrial metals

• Piping and pressure-system inspection programs

• Field and plant-based ultrasonic inspection workflows

Instrument connector type, cable configuration, measurement range, material, surface temperature, and gauge compatibility should be confirmed before ordering.

Ideal Applications

• High-temperature ultrasonic thickness measurement

• Hot piping inspection

• Refinery process piping

• Petrochemical plant inspection

• Pressure-vessel inspection

• Boiler inspection

• Steam-line inspection

• Heat-exchanger inspection

• Storage-tank inspection

• Power-generation equipment

• Chemical processing equipment

• Corrosion monitoring

• Remaining-wall evaluation

• Erosion monitoring

• Small-diameter pipe inspection

• Online inspection of operating equipment

• Preventive maintenance

• Asset-integrity programs

• Field ultrasonic testing

Typical Components Inspected

The T-042-1000 can be used on suitable components such as:

• Process piping

• Steam lines

• Boiler tubes

• Pressure vessels

• Reactor vessels

• Heat exchangers

• Storage tanks

• Valves

• Elbows

• Reducers

• Small-diameter piping

• High-temperature structural components

• Industrial machinery

• Refinery equipment

Inspection Guidelines

• Clean loose scale, oxidation, and contamination from the measurement point when possible

• Verify surface temperature before applying the transducer

• Select an appropriate high-temperature couplant

• Calibrate the ultrasonic gauge using the applicable material velocity and reference standard

• Apply couplant to the inspection point

• Position the transducer firmly against the surface

• Obtain a stable thickness reading

• Limit contact time at elevated temperatures according to the applicable procedure

• Remove the probe and allow it to cool if necessary

• Repeat measurements where required to confirm consistency

• Record thickness, location, surface temperature, and inspection conditions

Care and Handling

• Avoid dropping or striking the transducer

• Do not exceed the specified maximum operating temperature

• Avoid prolonged exposure to maximum surface temperature

• Inspect the probe face regularly for wear or heat damage

• Check the potted cable transition for cracking or deterioration

• Avoid sharply bending or twisting the cable

• Remove couplant residue after inspection

• Allow the probe to cool naturally after high-temperature use

• Store in a clean, dry location when not in service

• Replace worn or 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, high-temperature inspection, manufacturing, fabrication, maintenance, power generation, petrochemical processing, asset integrity, and industrial quality-control applications.