7641 High Temperature Clip-On Gages are designed for fracture mechanics testing in environmental chambers where the entire gage must be exposed to high temperatures. These capacitive sensors can be used up to 700 °C (1300 °F) without requiring any cooling.
The Model 7641 provides a number of improvements to Epsilon’s offerings for an uncooled, axial extensometer including:
A new body style to optimize mechanical performance and minimize size and weight
Increased operational temperature
A new probe design that also offers several improvements including better frequency response, lower noise, improved flexibility, and durability
The ability to store calibrations of multiple extensometers with one signal conditioner
Epsilon extensometers are compatible with almost every brand of test equipment and can be delivered with the correct connector to plug in directly.
The company 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.
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 suitable for the determination of fracture mechanics parameters such as KIC, JIC, R-curve, fatigue crack growth rate (da/dN), and testing to standards such as E399, E1820, E647, etc. All units can be displaced slightly in compression for easy installation.
The COD gage is supplied with the advanced DT6229 controller. The standard output is 0 - 10 VDC analog signal, factory calibrated with the COD gage. This system provides a number of functional enhancements including: high speed digital output, integrated calibration and tare functions, digital and analog filters, and more.
The 7641 can be easily interfaced with a number of current test controllers and may be directly connected to a chart recorder or data acquisition system, or directly to a PC. The 7641 can be used for strain controlled tests such as JIC.
The key features of the
Model 7641 are listed below:
Can be left on through specimen failure
Improved performance at high temperature
Improved noise rejection, accuracy, and resolution
Improved clearance with a number of clevis designs
Improved linearity and reduced stiffness
Reduced weight and size, and better high frequency performance
All standard models are ideal for cyclic testing
>25 Hz is typical for 10 mm GL and larger, up to 100 Hz for some configurations
Typically limited by the user’s test apparatus, filter selection, and software settings
Digital controller and power supply are included. Provides high level DC voltage output with low noise. Can be easily interfaced to test controllers, chart recorders, and data acquisition boards
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 extensometer calibration files can be loaded for use with a single controller
Multiple temperature-specific calibrations can be stored
Selectable digital and analog filter options from 2 Hz to 3 kHz
Delivered fully calibrated with electronics (traceable to NPL (UK)) with user specified voltage output.
Mechanical over-travel protection
All standard units comply with current ASTM E399, ASTM E1820 and ISO 12135 requirements for accuracy
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
Model 7641 are provided below:
Analog output: User specified, +/-5 VDC or +/-10 VDC typical, ±10.8 VDC rail
Digital output: 24 bit high speed Ethernet output with built-in web interface
Analog filter: Selectable 100 Hz analog and 2 Hz - 3 kHz digital filters
Linearity: 11 point linearization, ≤0.1% FS typical linearity
Cyclic testing: >25 Hz typical @ 10 mm GL, >10 Hz @ 5 mm GL
Resolution: <55 PPM (0.006%FS) RMS @ 4 kHz, <6 PPM (0.0006%FS) @ 100 Hz
Temperature sensitivity (Gain): Temperature sensitivity (Offset): 20 PPM / °C (0.002%FS / °C) typical
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
Operating force: 1 - 5 kg typical, depending on model
Sensor cable: 0.7 m (2.5 ft) tri-axial high temperature cable, plus 1.5 m (5 ft) room temperature extension cable
Environment: Recommended for high temperature testing in dry air or inert/non-corrosive gases
Power: Includes power supply applicable to customer’s country Options
The following options are offered with the
Bulkhead adapters for vacuum chambers
Connectors to interface to nearly any brand test equipment
Dual-channel DT6229 controller is provided
Bolt on knife edges for attachment to test specimens without machined attachment points
7641 High Temperature Clip-On Gages (600°C) for Fracture Mechanics Testing in Environmental Chambers