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ADMET H. T. Extensometer

High Temperature Hot Mountable Furnace Extensometer

Universal Testing Machine Accessories

The High Temperature Hot Mountable Furnace Extensometer (1200 °C / 1600 °C) is a major advancement in the design of externally mounted furnace extensometers, engineered to deliver highly accurate strain-controlled testing in accordance with ISO 6892, ISO 12106, ASTM E21, and ASTM E606 standards. It is ideally suited for demanding applications such as static tensile testing, low cycle fatigue, creep, and other long-term high-temperature testing where precise small strain measurement is critical. The advanced mechanical design significantly reduces the influence of laboratory vibrations, thermal noise, and thermal drift, while allowing the operator to precisely control contact force on the specimen for consistent, repeatable, and reliable results.

The gauge length is automatically set prior to mounting, enabling safe and accurate hot mounting after thermal equilibrium is achieved and supporting rapid high-temperature testing in carousel furnace systems. The extensometer mounts on a supplied slide bracket that attaches to a load frame or directly to a furnace cutout, with custom mounting options available for most test systems. Designed for use with split-type furnaces and induction heaters, the 1200 °C version is supplied with high-purity alumina rods, while the 1600 °C option uses alpha-grade silicon carbide rods for extreme temperature stability. As a strain-gaged device, it is fully compatible with standard test machine controllers and data acquisition systems, ensuring stable, accurate, and high-resolution strain measurement for critical high-temperature material testing.

 

Category:

universal testing machine accessories, universal testing machine price, accessories, High Temperature extensometer, strain measurement, non-contact extensometer, optical strain measurement, ASTM E83.

Video Extensometer Overview

The Video Extensometer is an advanced, non-contact extensometer designed for precise measurement of strain during material testing. Using video-based technology, it provides high-accuracy strain data by tracking the movement of markers placed on a specimen’s surface during tension, compression, or flexural testing with universal testing machines. This extensometer is particularly useful in research and quality control applications, where traditional contact-based extensometers may not be suitable due to specimen characteristics or the need for high-precision measurements.

The Video Extensometer works by capturing high-resolution video footage of the specimen in real-time, analyzing the movement of distinct markers placed along the specimen’s length. This allows it to measure both axial and transverse strain without physically contacting the specimen, making it ideal for soft, thin, or delicate materials that could be damaged by traditional extensometer grips.

This extensometer provides several key benefits, such as high accuracy, the ability to measure large areas of deformation, and real-time strain analysis. It is compatible with a wide range of materials, including metals, plastics, composites, rubber, and even biological specimens, making it suitable for various industries, including aerospace, automotive, research, and materials science.

The Video Extensometer is equipped with sophisticated software that processes the video footage and calculates strain values with minimal user intervention. The software provides real-time feedback, enabling the user to monitor material behavior during testing and making it easier to conduct detailed post-test analyses. It also helps in detecting microstructural changes during testing, which are often missed by traditional contact-based methods.

Easy to install and integrate with most universal testing machines, the Video Extensometer enhances testing flexibility and accuracy. It is particularly effective for tests requiring high precision, such as evaluating material failure mechanisms or performing tests at high speeds.

For more information on the Video Extensometer, customization options, and universal testing machine price, contact us today.

High Temperature Extensometer Features

  • Can be safely left in position until complete specimen failure

  • Hot-mountable and fully retractable for high-temperature testing convenience

  • Engineered for demanding strain-controlled testing as per ISO 6892, ISO 12106, ASTM E21, and ASTM E606 standards

  • Strain sensing system is fully isolated from external vibrations and unwanted thermal effects

  • Suitable for both tension and compression measurements, including cyclic testing

  • Innovative slide-mount system allows specimen engagement only after target test temperature is reached

  • Automatic gauge length setting mechanism enables fast and repeatable mounting within seconds

  • Low and repeatable contact force control through integrated contact force adjustment assembly

  • Gauge length can be easily adjusted between 10 mm and 50 mm using precision spacers

  • Compatible with both single furnaces and multi-station carousel testing systems

  • Rugged dual-flexure mechanical design for superior strength and long-term accuracy

  • Mechanical over-travel protection provided in both directions

  • Available with high-purity alumina ceramic rods for 1200 °C or alpha-grade silicon carbide rods for 1600 °C

  • Quick-attach liquid cooling and electrical connectors for fast and easy installation

  • Integrated shunt calibration system for on-site electrical verification

  • Full-bridge 350-ohm strain-gaged construction for wide test system compatibility

  • Supplied with a high-quality foam-lined protective case and a spare set of ceramic rods

Accuracy
Standard configurations comply with ASTM E83 Class B-1 and ISO 9513 Class 0.5 accuracy requirements. Each unit is supplied with a verified test certificate. Rod lengths exceeding 250 mm (10″) may influence the final accuracy class.

Temperature Range
Standard configuration operates up to 1200 °C (2200 °F). The high-temperature option extends performance up to 1600 °C (2900 °F).

Coolant Interface
Equipped with dual barbed hose connections suitable for 1/8” (3.2 mm) inner diameter coolant hoses for efficient liquid cooling.

Contact Force
Adjustable contact force up to 400 grams for precise and repeatable specimen engagement.

Operating Force
Typical operating force remains below 30 grams, ensuring minimal influence on test results.

Cable
Supplied with an integral ultra-flexible cable, standard length 2.5 meters (8 feet), designed for high-temperature environments.

Excitation
Recommended excitation voltage range is 5 to 10 VDC, with a maximum limit of 12 VDC or VAC.

Output Signal
Nominal output range of 1.5 to 2 mV/V, depending on configuration and application requirements.

Applications for Universal Testing Machines (UTMs):
  • High-temperature tensile testing of metals and alloys
  • Low cycle fatigue (LCF) testing at elevated temperatures
  • Creep deformation and long-term creep rupture studies
  • Stress rupture testing under sustained load and heat
  • Thermo-mechanical fatigue (TMF) testing
  • High-temperature compression and cyclic loading tests
  • Evaluation of superalloys and aerospace-grade materials
  • Testing of turbine blades, exhaust components, and boiler tubes
  • Heat treatment process validation and material behavior analysis
  • Weld joint and heat-affected zone (HAZ) testing
  • Nuclear materials and high-radiation environment research
  • Advanced materials research in metallurgical and R&D laboratories
1.What is a High Temperature Extensometer??

A High Temperature Extensometer is a precision device used to measure strain and deformation of materials during mechanical testing at elevated temperatures.

 

Standard versions operate up to 1200 °C, while high-temperature variants can work reliably up to 1600 °C.

It is used for tensile testing, low cycle fatigue, creep testing, stress rupture testing, thermo-mechanical fatigue, and cyclic loading tests.

Yes, it is designed to measure strain accurately in both tension and compression modes.

Yes, hot-mountable designs allow the extensometer to be mounted after the furnace reaches the test temperature.

Liquid cooling protects the extensometer body from extreme heat and ensures stable and accurate strain measurement during long-duration tests.

The contact force is adjustable, allowing precise and repeatable placement on the specimen without affecting test results.

It is compatible with most universal testing machines, high-temperature furnaces, and data acquisition systems.

Each unit is supplied with a calibration certificate, and periodic verification is recommended for maximum accuracy.

They are widely used in aerospace, automotive, power generation, metallurgy, nuclear research, defense, and advanced material testing laboratories.

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