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High Temperature Un-Cooled Extensometers (700 °C) – Model 7642

Epsilon Model 7642 Extensometer

For use 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.

The Model 7642 INTRODUCES SEVERAL IMPROVEMENTS to Epsilon’s offerings for an uncooled, axial extensometer including:


  • A new body style to optimize mechanical performance and reduce weight and size

  • A new probe design that also provides many improvements including lower noise, better frequency response, improved flexibility and durability

  • Increased operational temperature

  • The ability to store calibrations of multiple extensometers with one signal conditioner

These 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 7642 is ideal for testing composites, metals and high temperature polymers in tensile, compression or cyclic testing. All units can be displaced in both compression and tension.

The extensometer 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.

The 7642 is readily interfaced with most existing test controllers, and may be directly connected to a data acquisition system or chart recorder, or directly to a PC. The 7642 may be used for strain controlled tests such as low cycle fatigue (LCF).

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