High Temperature Transverse Extensometers (700 °C) – Model 7675

Designed for transverse or diametral strain measurement in environmental chambers where the entire extensometer must be exposed to elevated temperatures. These capacitive extensometers may be used up to 700 °C (1300 °F) without any cooling.

Epsilon extensometers are COMPATIBLE WITH VIRTUALLY EVERY BRAND OF TEST EQUIPMENT and can be supplied with the correct connector to plug in directly.

36 EXTENSOMETER MODELS are available in many thousands of variations. Our focus on helping customers has led to the development of models to cover nearly any test method.

WITH EPSILON’S 20+ YEAR HISTORY OF SERVICE to the materials testing community, you know we will be there to stand behind our products when your critical application requires it.

These transverse extensometers use a high-temperature capacitive sensor and do not require any cooling. They will operate up to the maximum temperature limit of most environmental chambers used in materials testing. The Model 7675 is ideal for determination of Poisson’s ratio, and for transverse strain characterization of anisotropic materials such as composites. All units can accommodate both positive and negative displacements.

Model 7675 transverse extensometers are compatible with most Model 7642 high-temperature axial extensometers. Together, these extensometers are suitable for high temperature measurement of Poisson’s ratio per ASTM E132 with most materials and specimens.

The 7675 is supplied 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, built in calibration and tare functions, analog and digital filters, and more.

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

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Analog Output: User specified, ±5 VDC or ±10VDC typical, ±10.8VDC rail

Digital Output: 24 bit high speed Ethernet output with built-in web interface

Linearity: 11 point linearization, ≤0.15% of full scale typical

Resolution: <55 PPM (0.006%FS) RMS @ 4 kHz, <6 PPM (0.0006%FS) @ 100 Hz

Analog Filter: Selectable 100 Hz analog and 2 Hz – 3 kHz digital filters

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.

Temperature Sensitivity (Gain): <100 PPM / °C (0.01%FS/°C) typical (see Temperature Sensitivity Compensation)

Sensor Cable: 0.7 m (2.5 ft) tri-axial high temperature cable, plus 1.5 m (5 ft) room temperature extension cable

Specimen Size: Fits round samples up to 25 mm (1.0 inch) diameter and flats up to 25 mm (1.0 inch) wide

Axial Extensometer Compatibility: Compatible with model 7642 with gauge length ≥25 mm (1 inch); contact Epsilon if a shorter gauge length is required

Operating Force: 1-2 kgf (30-60 oz) typical, depending on model

Environment: Recommended for elevated temperature testing in dry air or inert / non-corrosive gases

Overall Dimensions: Contact Epsilon for overall dimensions

Power: Includes power supply for your country (specify)




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  • Reverse cable exit available
  • Connectors to interface to nearly any brand of test equipment
  • Bulkhead adapters for vacuum chambers
  • Dual-channel DT6229 controller
  • Specialty Knife Edges

Download Data Sheet

Ordering Information

Click table options to configure

Measuring Range
extension #
±1.2 mm -012M 012M
±2.5 mm * -025M 025M
±0.05 in -050T 050T
±0.10 in * -100T 100T
Model Number:  7675 – _ _ _
Model Number:
7675 – _ _ _
Model 7675 Available Versions: Available standard measuring ranges are listed above. Other configurations may be available with special order; please contact Epsilon to discuss your requirements.
*Preferred configuration
Example: 7675-025M: ±2.5 mm measuring range


If your unit is in need of service, calibration or repair, initiate the RMA process with us and we will be happy to assist.

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