7675 High Temperature Transverse Extensometer for Diametral Strain Measurement up to 700 °C

The 7675 High Temperature Transverse Extensometer from Epsilon is designed for transverse or diametral strain measurement in environmental chambers where the whole extensometer has to be exposed to high temperatures. These capacitive extensometers may be used up to 700 °C (1300 °F) without any cooling.

Epsilon extensometers are compatible with almost every brand of test equipment, and can be supplied with the right connector to plug in directly, or supplied with a separate amplifier and conditioner.

Epsilon offers 36 Extensometer Models in thousands of variations and their focus on helping customers has led to the development of models to cover virtually any test method.

Epsilon has 20+ years history of service for the materials testing community and will be there to stand behind their products when the user’s critical application requires it.

The 7675 High Temperature Transverse Extensometer uses a high-temperature capacitive sensor and does not require any cooling. It will operate up to the highest temperature limit of most environmental chambers used in materials testing.

The Model 7675 is ideal for the determination of Poisson’s ratio, and for characterizing anisotropic materials such as composites. All units can handle both positive and negative displacements. These extensometers are compatible with a number of Model 7642 high-temperature axial extensometers.

The 7675 extensometer is provided with the advanced DT6229 controller. The standard output is 0 - 10VDC analog signal, factory calibrated with the extensometer. This system provides a number of functional enhancements, including high speed digital output, analog and digital filters, integrated calibration and tare functions, and more.


The key features of the 7675 High Temperature Transverse Extensometer are as follows:

  • May be left on through specimen failure
  • Self-supporting on specimen
  • Better resolution, accuracy, and noise rejection at high temperature
  • Minimized size and weight, and better high frequency performance
  • All standard models are ideal for cyclic testing, >25 Hz is typical
  • Digital controller and power supply are provided. Provides high level DC voltage output with low noise. Easily interfaced to data acquisition boards, test controllers, and chart recorders
    • High speed analog and digital outputs are included
    • Intuitive web-based user interface for setup, calibration, and data acquisition
    • Integrated calibration reference and auto-zero features
    • Multiple temperature-specific calibrations can be stored
    • Multiple extensometer calibration files may be loaded for use with one controller
    • Selectable analog and digital filter options from 2 Hz to 3 kHz
  • Mechanical over-travel protection
  • Delivered fully calibrated with electronics (traceable to NPL (UK)) with user specified voltage output
  • Ideal for measuring Poisson’s ratio per ASTM E132 with most materials and specimens
  • Durable stainless steel knife edges
  • High quality foam lined case is provided
  • Rugged, dual flexure design for strength and enhanced performance. The next-generation design enables cyclic testing at much higher frequencies


The key specifications of the 7675 High Temperature Transverse Extensometer are as follows:

  • Analog output: User specified, +/-5 VDC or +/-10 VDC typical, ±10.8 VDC rail
  • Resolution: 25 Hz typical
  • Linearity: 11 point linearization, ≤0.1% of full scale typical
  • Digital output: 24 bit high speed Ethernet output with built-in web interface
  • Temperature range: Ambient to 700 °C (1300 °F). Use up to 800 °C is possible - contact Epsilon for details. Springs may require periodic adjustment or replacement after long-term testing above ~600 °C
  • Analog filter: Selectable 100 Hz analog and 2 Hz - 3 kHz digital filters
  • Sensor cable: 0.7 m (2.5 ft) tri-axial high temperature cable, plus 1.5 m (5 ft) room temperature extension cable
  • Temperature sensitivity (Gain): Temperature Sensitivity (Offset): 20 PPM / °C (0.002%FS/°C) typical
  • Specimen size: Fits round samples up to 25 mm (1.0”) diameter and flats up to 25 mm (1.0 inch) wide
  • Operating force: 1 - 2 kgf (30 - 60 oz) typical, depending on model
  • Power: Includes power supply for user’s country
  • Environment: Recommended for elevated temperature testing in dry air or inert/non-corrosive gases


The following are the options available with the 7675 High Temperature Transverse Extensometer:

  • Reverse cable exit is provided
  • Bulkhead adapters for vacuum chambers
  • Connectors to interface to nearly any brand test equipment
  • Specialty knife edges
  • Dual-channel DT6229 controller

7675 High Temperature Transverse Extensometer for Diametral Strain Measurement up to 700°C


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