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EXTENSOMETER
High Performance Extensometers

All extensometers are very high accuracy, with performance significantly better than required by various standards organizations. For ASTM E83, all will meet class B-1, except for a couple of special models, which meet class B-2. For ISO 9513, our extensometers meet class 0,5. Many extensometers regularly achieve a linearity better than 0.1% when calibrated at the factory. All units ship with a certificate of accuracy, traceable to NIST. Each is individually calibrated, with relevant data provided.

  • Extensometers are available to cover full scale elongations from 0.01 to 20 inches (0.25 mm to 0.5 m), in gage lengths from 0.25 to 20 inches (6 mm to 500 mm).  They cover temperatures from -265°C to +1600°C, and are available with or without electronics.

  • Extensometers are included for almost all engineering materials, including: elastomers, plastics, composites, metals, ceramics, geomaterials (e.g. rock, concrete, and asphalt), and biomaterials including bone.  There are models for tiny and delicate samples, including relatively fine wire, up to massive metal samples and large rock cores.

  • The huge variety of models covers nearly every type of test as well, including: tensile, compression, bend, fracture mechanics, and cyclic strain controlled tests like low cycle fatigue.  Most extensometers are capable of relatively high frequency operation.

  • Each extensometer carries a full year warranty. Strain measurement for materials testing is our sole business.
Fracture Mechanics Clip-On Gages Extensometer (3541)

These gages conform to the requirements of ASTM E399 for fracture toughness and E1820 and E813 for JIC and R-curve determination. In addition, the modified groove design complies with E1820 tests where greater stability and accuracy results from the sharper groove root. Clip-on gages are used for a variety of fracture mechanics tests, including compact tension, arc shaped, disk shaped, bend specimens or other specimen geometries in compliance with ASTM and other standards organization’s test methods. Clip-on gages
can be used directly on test specimens where the knife edges are integral with the test specimen or, alternately, with optional bolt-on knife edges mounted on the test specimen.    
The Model 3541 extensometers are strain gaged devices, making them compatible with any electronics designed for strain gaged transducers. Most often they are connected to a test machine controller. The signal conditioning electronics for the extensometer is typically included with the test machine controller or may often be added. In this case the extensometer is shipped with the proper connector and wiring to plug directly into the electronics. For systems lacking the required electronics, Epsilon can provide a variety of solutions, allowing the extensometer output to be connected to data acquisition boards, chart recorders or other equipment.
  • Full bridge, 350 ohm strain gaged design for compatibility with nearly any test system.
  • Fully enclosed gages to protect from accidental damage.
  • All standard units meet existing ASTM requirements for accuracy.
  • Sharp grooves per ASTM E1820, E813, and E399 for improved stability when mounted.
  • Includes high quality foam lined case.
  • All capable of high frequency operation (50 Hz or faster, depending on version).
Axial Extensometer (3542)
These extensometers are designed for testing a wide range of materials, including metals, plastics, composites and ceramics. All will work in both tension and compression. The dual
flexure design makes them very rugged and insensitive to vibrations, which permits higher frequency operation. They come standard with Epsilon’s quick attach kit, making it easy to mount the extensometer on the test specimen in seconds with one hand. The quick attach kit can be removed, allowing mounting of the extensometer with springs or rubber bands.     
The Model 3542 extensometers are strain gaged devices, making them compatible with any electronics designed for strain gaged transducers. Most often they are connected to a test machine controller. The signal conditioning electronics for the extensometer is typically included with the test machine controller or may often be added. In this case the extensometer is shipped with the proper connector and wiring to plug directly into the electronics. For systems lacking the required electronics, we can provide a
variety of solutions, allowing the extensometer output to be connected to data acquisition boards, chart recorders or other equipment.
  • May be left on through specimen failure.
  • Full bridge, 350 ohm strain gaged design for compatibility with nearly any test system.
  • All models can measure in both tension and compression and can be used for cyclic testing.
  • Mechanical overtravel stops in both directions.
  • All standard units meet existing ASTM class B-1 and ISO 9513, class 0,5 requirements for accuracy.
  • Hardened tool steel knife edges are easily replaced. A spare set comes with
    every extensometer.
  • High and low temperature options extend operation from as low as -265 °C (-450 °F) to +175 °C (350 °F).
  • Includes high quality foam lined case.
  • Replaceable arms and spacers for ease of repair. This also allows changing the gage length for different test requirements.
  • Rugged, dual flexure design for strength and improved performance. Much stronger than single flexure designs, this also allows cyclic testing at higher frequencies.
  • Standard quick attach kit allows one hand mounting to specimens.
High Elongation Extensometer (3800)

The main body of this unique extensometer remains stationary during testing, held in position by the adjustable magnetic base included. Only the very light, small traveling
heads move as the sample elongates during a test. These attach to the sample with small spring clips. Each head pulls a cord out from the extensometer as the head moves. These models use high precision, low friction potentiometers, and, as a result, have a wide range of factory selectable outputs. The extensometer is driven by an excitation voltage and has output proportional to the input. They can be provided with high level outputs (appr. 2-8 VDC) or ones that mimic strain gaged devices (2-4 mV/V).                                        When set to mimic strain gaged extensometers, the Model 3800 can be used with virtually any signal conditioning electronics designed for strain gaged sensors. The potentiometers employ a hybrid wire wound around conductive plastic, which provides infinite resolution and excellent long term stability. The output from the extensometer is readily interfaced with most existing test controllers, and may be directly input to data acquisition systems and chart recorders.
  • May be left on through specimen failure. The main body is stationary with only the lightweight traveling heads moving.
  • Includes high quality foam lined case.
  • Comes with an adjustable magnetic base for easy mounting.
  • Large measuring range to 20 inches (500 mm).
  • Low cost, high accuracy elastomer strain measurement.

 

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