GT12 / HT5 High Temperature Ultrasonic Probe Thickness Gauge (Up To 350 °C)

The GT-12/HT-5 High Temperature Ultrasonic Thickness Gauge Probe is a precision-engineered ultrasonic transducer designed specifically for material thickness measurement in elevated temperature environments up to 350°C. 

Built for industrial nondestructive testing (NDT) applications, this 5 MHz high temperature ultrasonic probe delivers stable, repeatable, and accurate readings on heated metal surfaces where conventional probes fail.

Manufactured for compatibility with ultrasonic thickness gauges used in fabrication plants, refineries, power generation facilities, shipyards, and heavy engineering industries, the GT-12/HT-5 model provides a dependable solution for professionals who require reliable thickness inspection under extreme thermal conditions.

With a 5 MHz operating frequency, 14 mm contact diameter, and 4 mm to 80 mm measuring range, this high-temperature thickness gauge probe ensures optimal penetration, signal clarity, and measurement accuracy across a broad spectrum of industrial metals.

Key Technical Specifications

• Model: GT-12/HT-5
• Probe Type: High Temperature Ultrasonic Thickness Gauge Probe
• Frequency: 5 MHz
• Contact Diameter: 14 mm
• Measuring Range: 4 mm – 80 mm
• Maximum Operating Temperature: Up to 350°C
• Application: High-temperature thickness measurement
• Technology: Ultrasonic pulse-echo method

Engineered for High Temperature Thickness Measurement Applications

Standard ultrasonic transducers are not designed to withstand prolonged exposure to elevated temperatures. Excessive heat can degrade piezoelectric elements, distort readings, and shorten probe lifespan. The GT-12/HT-5 ultrasonic thickness transducer is specifically engineered for hot surface inspection, maintaining measurement stability in environments reaching 350 degrees Celsius.

This makes it ideal for:

• Hot rolled steel inspection
• Boiler tube thickness monitoring
• Pressure vessel testing
• Petrochemical pipeline evaluation
• Power plant maintenance inspections
• Furnace and heat exchanger measurement
• Heavy machinery component verification

The probe’s robust construction ensures reliable acoustic coupling and signal transmission even when applied to heated steel plates, pipes, and structural components.

5 MHz Frequency for Optimal Balance of Penetration and Accuracy

The 5 MHz ultrasonic frequency provides an optimal balance between penetration depth and resolution. Lower frequencies penetrate thicker materials but reduce resolution. Higher frequencies improve resolution but limit penetration depth.

The GT-12/HT-5 strikes the ideal equilibrium for industrial metal inspection, enabling:

• Precise measurement on medium-to-thick materials
• Reliable echo return in high-temperature conditions
• Reduced signal attenuation
• Enhanced waveform stability

The 5 MHz configuration ensures dependable performance across its 4–80 mm thickness range.

14 mm Contact Diameter for Stable Surface Coupling

The 14 mm contact diameter offers improved surface contact stability, particularly on flat and slightly curved surfaces such as pipes and plates. A larger contact footprint ensures:

• Consistent acoustic coupling
• Reduced signal fluctuation
• Stable echo formation
• Improved repeatability

This design enhances reliability when measuring oxidized, scaled, or thermally stressed metal surfaces.

Measuring Range: 4 mm to 80 mm

The GT-12/HT-5 high temperature ultrasonic probe is optimized for thickness measurement between 4 mm and 80 mm, making it suitable for:

• Steel plates
• Industrial piping
• Storage tanks
• Structural beams
• Heat exchangers
• Boilers

This wide range provides flexibility across various industrial inspection requirements without requiring multiple probe replacements.

Built for Harsh Industrial Environments

Industrial inspection environments are rarely ideal. High temperatures, surface scaling, vibration, and environmental exposure demand durable equipment. The GT-12/HT-5 high temperature ultrasonic thickness gauge probe is built with:

• Heat-resistant internal components
• High-temperature tolerant acoustic stack
• Industrial-grade housing
• Durable cable configuration

The probe maintains structural integrity and measurement accuracy under demanding operational conditions.

Compatibility with Ultrasonic Thickness Gauges

This high-temperature ultrasonic thickness transducer is designed for use with compatible ultrasonic thickness gauges that support high temperature probes. It operates using the pulse-echo principle, allowing non-destructive evaluation without damaging the test material.

Always ensure compatibility with your specific thickness gauge model before installation.

Applications of GT-12/HT-5 High Temperature Ultrasonic Probe

1. Oil & Gas Industry

In refineries and petrochemical plants, equipment operates under extreme heat. Shutting down systems for cooling is costly. This high temperature ultrasonic probe enables on-site hot inspections to monitor:

• Corrosion under insulation (CUI)
• Wall thinning
• Erosion damage
• Pressure pipeline integrity

2. Power Generation Facilities

Boilers, steam pipes, and turbines operate at elevated temperatures. This industrial ultrasonic thickness probe ensures:

• Continuous asset integrity management
• Preventative maintenance
• Compliance with safety standards

3. Shipbuilding & Marine Industry

Marine components exposed to heat and pressure require reliable NDT inspection. The GT-12/HT-5 provides consistent thickness readings on structural steel components.

4. Heavy Fabrication & Steel Mills

During hot rolling and metal processing operations, thickness verification is critical. This probe allows high-temperature inspection without process interruption.

Advantages of Using a High Temperature Ultrasonic Thickness Gauge Probe

Choosing a specialized high temperature probe like the GT-12/HT-5 offers significant advantages:

Accurate Measurements on Heated Surfaces

Standard probes produce unreliable readings at elevated temperatures. This probe maintains measurement precision.

Reduced Downtime

Hot surface measurement eliminates the need for cooling shutdowns.

Improved Workplace Safety

Operators avoid delays and repeated exposure during cooled re-testing.

Cost Efficiency

Prevents equipment failure by enabling early detection of wall thinning and corrosion.

Long Service Life

Designed specifically for thermal resistance and industrial durability.

How Ultrasonic Thickness Measurement Works

The GT-12/HT-5 ultrasonic thickness transducer operates using the pulse-echo ultrasonic testing method:

1. The probe emits a high-frequency ultrasonic pulse into the material.
2. The sound wave travels through the material.
3. The wave reflects from the back wall.
4. The probe receives the echo.
5. The thickness gauge calculates thickness based on time-of-flight.

Because ultrasonic waves travel at known velocities through specific materials, the system computes accurate thickness without cutting, drilling, or damaging the test surface.

Designed for Professional NDT Inspectors

This industrial ultrasonic thickness probe is engineered for:

• NDT technicians
• Mechanical inspectors
• Maintenance engineers
• Quality assurance professionals
• Asset integrity managers

Its performance characteristics align with industrial inspection standards and field requirements.

Performance Stability at 350°C

At elevated temperatures, sound velocity in materials changes. High temperature probes must withstand both physical heat stress and signal variation.

The GT-12/HT-5 maintains:

• Stable piezoelectric response
• Controlled thermal expansion
• Consistent echo amplitude
• Reliable waveform clarity

This ensures repeatable thickness readings even under thermal stress.

Why Choose GT-12/HT-5 Over Standard Probes?

Installation & Usage Guidelines

For optimal results:

• Use appropriate high-temperature couplant.
• Minimize prolonged continuous contact time.
• Calibrate thickness gauge before measurement.
• Follow manufacturer-recommended temperature exposure limits.

Proper handling ensures extended service life and consistent measurement accuracy.

Frequently Asked Questions

What is the maximum temperature this ultrasonic probe can handle?

The GT-12/HT-5 high temperature ultrasonic thickness gauge probe is rated for use on surfaces up to 350°C.

What materials can this probe measure?

It is primarily designed for metallic materials such as:

• Carbon steel
• Stainless steel
• Alloy steel
• Industrial structural metals

What is the operating frequency of this probe?

The probe operates at 5 MHz, offering an optimal balance between penetration depth and measurement resolution.

What thickness range does this probe support?

It measures material thickness from 4 mm to 80 mm, depending on material type and surface condition.

Why is a high temperature ultrasonic probe necessary?

Standard probes can lose accuracy or become damaged at high temperatures. A high-temperature ultrasonic transducer ensures safe, reliable measurement under thermal stress.

Can this probe be used continuously at 350°C?

It is designed for high temperature applications; however, continuous prolonged exposure should follow operational best practices and equipment guidelines.

Is calibration required before use?

Yes. Calibration with a reference test block is recommended before performing measurements for maximum accuracy.

Does this probe support curved surfaces?

Yes. The 14 mm contact diameter provides stable coupling on flat and moderately curved surfaces such as pipes.

What industries use this high temperature thickness gauge probe?

Common industries include:

• Oil & Gas
• Petrochemical
• Power Generation
• Marine
• Heavy Fabrication
• Steel Manufacturing

What measurement method does this probe use?

It operates using the ultrasonic pulse-echo method, a non-destructive testing technique.

Order the GT-12/HT-5 High Temperature Ultrasonic Thickness Gauge Probe Today

When high-temperature environments demand precision, durability, and reliability, the GT-12/HT-5 high temperature ultrasonic thickness gauge probe delivers professional-grade performance. 

Designed for industrial thickness measurement up to 350°C, this ultrasonic transducer ensures accurate wall thickness inspection without compromising safety or productivity.

Upgrade your ultrasonic thickness measurement capabilities with a probe engineered specifically for extreme heat applications. Ideal for NDT professionals who demand performance under pressure, the GT-12/HT-5 provides the confidence and precision your inspection process requires.