Long gage length extensometers with gage lengths greater than 2 inches (50 mm) for tensile and compression testing.  These units have been specially designed for long gage length applications where low level strain measurements are required.

The dual flexure design makes the 3542L very rugged and insensitive to vibrations. These extensometers are designed for testing a wide range of materials, including metals, plastics, composites and ceramics. Epsilon’s Model 3543 is recommended for applications requiring long gage lengths and larger measuring ranges.

The Model 3542L comes standard with Epsilon’s quick attach kit, making it easy to mount the extensometer on the test specimen. The quick attach kit can be removed, allowing mounting of the extensometer with springs or rubber bands.

The 3542L 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.

A PDF document containing specifications on the 3542L can be downloaded from the following link: PDF DOWNLOAD.

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• 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 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 quick mounting to specimens.

Excitation: 5 to 10 VDC recommended, 12 VDC or VAC max.

Output: 2 to 4 mV/V, nominal, depending on model

Linearity: 0.10% to 0.15% of full scale measuring range, depending on model

Temperature Range: Standard (-ST) is -40 °C to +100 °C (-40 °F to 210°F)

Cable: Integral, ultra-flexible cable, 8 ft (2.5 m) standard

Standard Quick Attach Kit: Fits round samples up to 1.0 inch diameter (25 mm) and flats to 0.5 inch thick by 1.25 inch wide (12 mm by 31 mm)

Operating Force: Depends on model configuration, less than 30 g typically