High-temperature extensometer 7641 series

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Designed for fracture mechanics testing in environmental chambers where the entire gage must be exposed to elevated temperatures. These capacitive sensors may be used up to 700 °C (1300 °F) without any cooling. These COD gages 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 7641 is ideal for determination of fracture mechanics parameters such as JIC, KIC, R-curve, fatigue crack growth rate (da/dN), and testing to standards such as ISO 12135, ASTM E1820, E399, E647, etc. All units can be displaced slightly in compression for ease of installation. The COD gage is supplied with the advanced DT6229 controller. The standard output is a 0-10V analog signal, factory calibrated with the COD gage. This system provides a number of functional enhancements including: built in calibration and tare functions, multi-point linearization, analog and digital filters, high speed digital output, and more. The 7641 is readily interfaced with most existing test controllers or may be directly connected to a data acquisition system, chart recorder, or a PC. The 7641 may be used for strain-controlled tests such as JIC. The 7641 Gen2 now includes improved overtravel protection. The enhanced mounting tips accommodate even more specimen geometries, while simultaneously improving handheld ergonomics and ease of installation. Additionally, the improved design now comes standard with an attachment point for tethers and/or counterbalances.