Dakota Ultrasonics — T-042-2700 Dual-Element High-Temperature Transducer

5.0 MHz, 1/4 in Dual-Element Ultrasonic Transducer, High-Damped, High-Temperature, Potted Top Entry, Rated up to 650°F
SKU: T-042-2700

Overview

The Dakota Ultrasonics T-042-2700 is a 5.0 MHz dual-element ultrasonic transducer designed for high-temperature thickness measurement and corrosion-monitoring applications. Its high-temperature construction allows use on surfaces reaching approximately 650°F (343°C), making it suitable for inspections where equipment remains in service or cannot be cooled before measurement.

The transducer features a compact 1/4 in contact size, making it practical for piping, small-radius surfaces, restricted areas, and localized corrosion points. Its high-damped (HD) design helps shorten pulse duration and reduce ringing, supporting improved near-surface response and clearer separation of closely spaced echoes.

A permanently potted top-entry cable provides a secure probe connection and straightforward cable routing during field, plant, maintenance, and asset-integrity inspection work.

What's Included

Note: Ultrasonic thickness gauge, high-temperature 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

Temperature Capability

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

Performance Features

5.0 MHz Operating Frequency
Provides a strong balance between ultrasonic resolution and penetration for industrial thickness-gauging applications.

High-Temperature Capability
Designed for ultrasonic measurements on hot surfaces up to approximately 650°F, reducing the need for shutdown or cooling solely for inspection.

High-Damped Construction
Helps reduce ringing and shorten pulse duration, supporting improved near-surface resolution and cleaner echo separation.

Dual-Element Design
Separate transmitting and receiving elements support reliable corrosion and remaining-wall measurements.

1/4 in Compact Contact Area
Provides a small inspection footprint suitable for piping, curved surfaces, restricted locations, and localized corrosion areas.

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

High-Damped Design Advantages

The HD configuration may provide useful benefits in suitable ultrasonic applications, including:

• Reduced transducer ringing

• Shorter ultrasonic pulse duration

• Improved near-surface response

• Better separation of closely spaced echoes

• More distinct back-wall signals

• Improved performance on thinner sections

• Useful response for localized corrosion measurements

• Enhanced measurement clarity in suitable materials

Actual results depend on the material, thickness, surface condition, couplant, instrument setup, and calibration.

User-Friendly Design

• Compact 1/4 in probe footprint

• Suitable for curved and restricted-access components

• High-damped response supports detailed measurements

• Dual-element configuration supports corrosion monitoring

• Top-entry cable provides conventional probe handling

• Potted construction provides a secure fixed connection

• Suitable for spot measurements and repeated monitoring

• Practical for portable field inspection systems

Built for High-Temperature Industrial Environments

• Designed for professional ultrasonic thickness testing

• Suitable for refineries and petrochemical plants

• Practical for power-generation facilities

• Supports inspection of operating process equipment

• Suitable for hot piping, vessels, and machinery

• Useful for corrosion monitoring during online operation

• Compact geometry supports difficult-access inspection points

• Fixed cable configuration supports routine field handling

• 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 sound velocity caused by temperature

• Limit unnecessary probe contact time on extremely hot surfaces

• Allow the transducer to cool between measurements when required

• Follow the probe manufacturer's recommended duty cycle

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

• Maintain consistent coupling pressure

• Use suitable personal protective equipment around hot components

• Follow facility-specific process-safety requirements

Measurements at elevated temperature may require correction because ultrasonic velocity changes as material temperature changes.

Compatibility

Compatible with:

• Dakota ultrasonic thickness gauges supporting dual-element transducers

• Instruments configured for 5.0 MHz operation

• High-temperature corrosion-monitoring modes

• Pulse-echo ultrasonic thickness procedures

• High-temperature ultrasonic couplants

• Appropriate calibration blocks and standards

• Carbon steel and other suitable industrial metals

• Field and plant-based ultrasonic inspection programs

Instrument model, cable termination, measurement range, material, temperature range, and probe 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-042-2700 may be suitable for:

• Process piping

• Steam lines

• Boiler tubes

• Pressure vessels

• Heat exchangers

• Storage tanks

• Valves

• Elbows and reducers

• Small-diameter piping

• Reactor vessels

• High-temperature structural components

• Industrial machinery

• Refinery equipment

• Power-generation components

Inspection Guidelines

• Verify that the ultrasonic gauge supports 5.0 MHz dual-element probes

• Confirm the surface temperature before inspection

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

• Select a suitable high-temperature couplant

• Calibrate the gauge using the appropriate material velocity and reference standard

• Apply couplant to the inspection location

• Position the transducer firmly against the surface

• Obtain a stable and repeatable thickness reading

• Limit contact duration at elevated temperatures according to procedure

• Remove the probe and allow cooling if necessary

• Repeat measurements where required

• Record thickness, location, and inspection temperature

Care and Handling

• Avoid dropping or striking the transducer

• Do not exceed the specified maximum temperature

• Avoid prolonged exposure at the maximum rated temperature

• Inspect the probe face regularly for wear or heat damage

• Check the potted cable transition for cracking or deterioration

• Avoid sharp bends or twisting of the cable

• Remove couplant residue after inspection

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

• Store in a clean, dry location

• Replace the transducer if wear or heat damage affects measurement repeatability

About Dakota Ultrasonics

Dakota Ultrasonics develops ultrasonic thickness gauges, flaw detectors, transducers, cables, couplants, and related accessories for professional non-destructive testing. Its products support corrosion monitoring, high-temperature inspection, fabrication, manufacturing, maintenance, petrochemical processing, power generation, asset integrity, and industrial quality-control applications.