High-Temperature Thickness Measuring Probe 300℃/500℃ Ultrasonic Probe for Steel Plates, Steel Pipes, Universal Type

The ultrasonic thickness probe is a professional-grade 5 MHz ultrasonic thickness gauge transducer engineered for precision wall thickness measurement on steel plates, steel pipes, and high-temperature industrial components.

Designed for operation at surface temperatures up to 300 °C or selectable 500 °C, this universal ultrasonic probe delivers stable, repeatable readings in demanding environments where conventional probes fail.

Built with a 10 mm wafer (crystal) diameter, 15 mm contact surface, and 1-meter high-temperature cable, the 300/500 model is ideal for corrosion monitoring, pipeline inspection, boiler systems, pressure vessels, storage tanks, ship hulls, and structural steel applications.

This is not a general-purpose sensor it is a high-temperature ultrasonic thickness measuring probe specifically developed for accurate non-destructive testing (NDT) of hot steel components in industrial facilities.

Overview: Industrial High-Temperature Thickness Measuring Probe

Model:

300/500 Sample

Product Type:

Ultrasonic thickness gauge probe / high-temperature ultrasonic transducer

Designed For:

• Steel plates
• Steel tubes
• Steel pipes
• Pressure vessels
• Boilers
• Industrial tanks
• Structural steel components

Temperature Options:

• Up to 300 °C
• Up to 500 °C (requires high-temperature couplant)

Technical Specifications

High Temperature Ultrasonic Thickness Probe for Steel Plates & Pipes

The 300/500 ultrasonic probe is optimized for hot surface wall thickness inspection where operational shutdown is not possible. In industries such as oil & gas, petrochemical plants, marine engineering, and power generation, pipelines and pressure systems operate at elevated temperatures. This probe enables accurate measurement without waiting for cooling, reducing downtime and production losses.

The 5 MHz ultrasonic frequency offers an excellent balance between penetration depth and resolution, making it suitable for medium to thick steel materials within the 3–220 mm measurement range.

Why Choose the 300/500 High-Temperature Ultrasonic Probe?

1. Dual Temperature Capability (300℃ / 500℃)

Unlike standard ultrasonic probes limited to low-temperature inspection, this model withstands extreme heat. Choose the 300 °C or 500 °C configuration based on your operational environment.

High-temperature resistant materials protect:

• The piezoelectric crystal
• Internal insulation
• Cable assembly
• Acoustic matching layers

Important: For accurate readings above ambient temperatures, a high-temperature ultrasonic couplant is required.

2. 5 MHz Industrial Frequency for Accurate Thickness Measurement

The 5 MHz transducer frequency is widely used in industrial NDT because it:

• Delivers strong signal penetration in steel
• Provides reliable echo return in thick materials
• Maintains signal clarity in corroded components
• Ensures consistent readings in pipe wall inspection

This makes it suitable for corrosion monitoring programs and predictive maintenance systems.

3. 3–220 mm Measuring Range for Heavy-Duty Applications

The 300/500 high-temperature thickness gauge probe supports a wide thickness range in steel materials. This versatility allows it to be used for:

• Thin steel plates (3 mm)
• Medium wall pipelines
• Thick pressure vessel walls
• Structural beams

The extended measuring capacity makes it a universal ultrasonic thickness transducer for industrial inspection teams.

4. 15 mm Contact Diameter for Stable Acoustic Coupling

The 15 mm contact surface ensures:

• Stable placement on curved or flat steel surfaces
• Better acoustic transmission
• Reduced signal loss
• Consistent repeatability

The 10 mm crystal (wafer diameter) ensures optimal beam formation and signal accuracy.

5. Universal Type Compatible with Most Ultrasonic Thickness Gauges

This high-temperature ultrasonic thickness probe is designed as a universal-type transducer, compatible with many standard ultrasonic thickness meters that support 5 MHz probes.

Before purchase, confirm:

• Connector type compatibility
• Instrument frequency compatibility
• Calibration requirements

Applications of High Temperature Ultrasonic Thickness Measuring Probe

The 300/500 is widely used in industries requiring hot inspection:

Oil & Gas Industry

• Pipeline thickness monitoring
• Refinery process lines
• Offshore platform steel inspection

Power Plants

• Boiler tube thickness measurement
• Steam pipe inspection
• Turbine housing wall checks

Petrochemical Facilities

• Reactor vessels
• Storage tanks
• High-temperature transfer lines

Marine & Shipbuilding

• Hull thickness inspection
• Cargo tank steel monitoring

Heavy Manufacturing

• Structural steel thickness verification
• Industrial furnace components

Advantages of Using a High-Temperature Ultrasonic Probe

Minimized Downtime

No need to shut down operations for cooling.

Non-Destructive Testing ((Migration NDT))

Measures thickness without cutting or damaging materials.

Corrosion Detection

Identifies wall thinning due to erosion and corrosion.

Increased Safety

Helps prevent catastrophic pipeline or vessel failures.

Cost-Effective Maintenance

Supports predictive maintenance strategies.

How High-Temperature Ultrasonic Thickness Measurement Works

The 300/500 ultrasonic transducer sends high-frequency sound waves into the steel surface. The sound wave travels through the material and reflects back from the back wall. The instrument calculates thickness based on:

• Sound velocity in steel
• Time-of-flight measurement
• Echo return signal

At elevated temperatures, sound velocity changes. Therefore:

• Calibration must be temperature compensated
• High-temperature couplant must be used
• Quick contact technique is recommended for 500 °C surfaces

Installation & Usage Recommendations

To maximize performance:

1. Use high-temperature ultrasonic couplant.
2. Apply probe briefly on 500 °C surfaces.
3. Calibrate instrument on similar-temperature reference block.
4. Avoid prolonged contact at extreme temperatures.
5. Inspect cable and connector regularly.

Maintenance Guidelines

• Clean probe face after each use.
• Avoid mechanical impact.
• Store in a dry, cool environment.
• Do not exceed rated temperature continuously.
• Replace couplant regularly.

High Temperature Ultrasonic Probe vs Standard Thickness Gauge Probe

Frequently Asked Questions

Can this ultrasonic thickness probe measure at 500 °C continuously?

It can measure up to 500 °C, but prolonged continuous contact is not recommended. Use quick contact technique and high-temperature couplant.

Is this probe compatible with all thickness gauges?

It is a universal type 5 MHz probe, compatible with many ultrasonic thickness meters. Verify connector and instrument compatibility before purchase.

What materials can it measure?

Primarily designed for steel plates, steel pipes, steel tubes, pressure vessels, and structural steel components.

What is the minimum measurable thickness?

Minimum measurable thickness is approximately 3 mm in steel.

Do I need a special couplant?

Yes. For high-temperature applications (300 °C/500 °C), a high-temperature ultrasonic couplant is mandatory.

What industries typically use this high-temperature thickness measuring probe?

Oil & gas, petrochemical plants, power generation, marine, and heavy manufacturing industries.

Does temperature affect accuracy?

Yes. Sound velocity changes at high temperatures. Proper calibration at operating temperature ensures accurate readings.

What is the benefit of 5 MHz frequency?

5 MHz offers a balanced combination of penetration and resolution, ideal for medium-to-thick steel materials.

Can it be used for corrosion monitoring programs?

Yes. It is ideal for corrosion and erosion thickness monitoring in pipelines and storage tanks.

What is the purpose of the 15 mm contact diameter?

It provides stable coupling and consistent signal transmission on flat and curved surfaces.