MODEL 7675 High Temperature
Transverse Extensometers (600 °C)

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 600 °C (1100 °F) without any cooling.

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 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.

The 7675 is supplied with the revolutionary 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.

Features

• 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
• Suitable for measuring Poisson's ratio per ASTM E132 with most materials and specimens
• 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.

 

Model 7675 Available Versions: Available standard measuring ranges are listed below. Other configurations may be available with special order; please contact Epsilon to discuss your requirements.

Specifications

Input: Includes power supply for your country (specify)
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, ≤0.1% of full scale typical
Resolution: <55 PPM (0.006%FS) RMS @ 4 kHz, <6 PPM (0.0006%FS) @ 100 Hz
Cyclic Testing: >25 Hz typical
Analog Filter: Selectable 100 Hz analog and 2Hz-3 kHz digital filters
Temperature Range: Ambient to 600 °C (1100 °F) typical
Temperature Sensitivity (Gain): <100 PPM / °C (0.01%FS/°C) typical
Temperature Sensitivity (Offset): 20 PPM / °C (0.002%FS/°C) typical
Sensor Cable: 2.5 ft (.7 m) tri-axial high temperature cable, plus 5 ft (1.5 m) room temperature extension cable
Specimen Size: Fits round samples up to 1.0 inch (25 mm) diameter and flats to 1.0 inch (25 mm) wide
Operating Force: 1-2 kgf (30-60 oz) typical, depending on model
Environment: Recommended for elevated temperature testing in dry air or some other gases.

Options

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

 

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