Clip-on extensometers equipped with an automatic gauge length setting facilitate rapid and consistent mounting to samples without the need for gauge pins. The innovative Quick-Swap gauge length system allows for one extensometer to have multiple gauge lengths, and gauge lengths can be changed in seconds. It is designed for enhanced productivity while maintaining high precision.
Product Videos
Epsilon Technology - Model 3742 - automatic gauge length
Model 3742’s gauge length is set automatically, saving time. Video Credit: Epsilon Technology Corporation
Epsilon Technology - Model 3742 - Quick Swap gauge length
Change gauge lengths in seconds without the need for tools. Video Credit: Epsilon Technology Corporation
Description
The Model 3742 clip-on extensometer is engineered for rapid installation and enhanced testing efficiency. It is particularly suitable for laboratories that need to change specimens and gauge lengths frequently, minimize setup time, and achieve reliable, repeatable strain measurements.
The 3742 is versatile for testing a diverse array of materials, such as metals, plastics, composites, and ceramics, under both tension and compression conditions.
This model automatically adjusts the gauge length as the extensometer is affixed to the specimen, eliminating the need for gauge length pins. Gauge lengths can be modified in seconds, without the use of tools, thanks to the 3742’s innovative Quick Swap gauge length system, and one measuring unit can have multiple gauge lengths. Fine adjustments can be performed to ensure that the gauge length stays within specified tolerances. The clamping force can be easily modified without requiring tools.
Included with the Model 3742 is Epsilon’s quick-attach kit, a standard feature that facilitates swift and straightforward mounting of the extensometer.
Model 3742 extensometers are suitable for testing in compliance with the following standards:
- ASTM E8, E9, D3039, D638, A370, D3552, E517, E646
- ISO 6892-1, 527-2, 527-4, 527-5, 10113
Model 3742 extensometers are devices equipped with strain gauges, which allow them to be used with any electronics designed for strain gauge transducers. Typically, they are linked to a test machine controller that has electronics for a strain channel, and Epsilon will provide the extensometer with a compatible connector that is wired to connect directly to the controller.
In cases where the necessary electronics are not available, Epsilon can offer various solutions for signal conditioning and integration with data acquisition systems or other equipment.
For gauge lengths shorter than 25 mm or 1 inch, Epsilon provides the more compact Model 3442. For gauge lengths that fall between the increments listed in Model 3742’s gauge length table, refer to Model 3542. For gauge lengths exceeding 100 mm or 4 inches, consult Model 3542L. Epsilon ONE non-contact extensometers are also compatible with a broad range of specimen sizes and gauge lengths.
Features
- The gauge length is established automatically when the extensometer is attached to the specimen, eliminating the need for gauge pins and facilitating quicker testing.
- The Quick-Swap gauge length system allows for changes in gauge lengths within seconds, requiring no tools.
- The fine-adjust feature for gauge length enables swift and straightforward adjustments as needed.
- The clamping force can be easily modified without the use of tools.
- In most applications, it can remain attached throughout the specimen's failure.
- All models are capable of measuring both tension and compression and can be utilized in closed-loop strain control as well as for cyclic testing.
- The Standard Quick Attach Kit enables rapid mounting to specimens.
- Featuring a robust dual flexure design, it offers enhanced strength and performance. This design is significantly stronger than single flexure designs and permits cyclic testing at elevated frequencies.
- Mechanical overtravel stops are included in both directions.
- The hardened tool steel knife edges can be easily replaced. Each model 3742 comes with a spare set of standard knife edges and a set of 3-point knife edges.
- High and low temperature options are available, ranging from -270 °C to +200 °C (-454 °F to +400 °F).
- It is compatible with nearly any test system, featuring a full bridge, 350 ohm strain-gaged design.
- The Epsilon Shunt Calibration System is included for on-site electrical calibration.
- A high-quality foam-lined case is provided.
Specifications
Specimen Sizes and Attachment:
- The Quick Attach Kit includes wireforms suitable for securing round samples with diameters ranging from 2 to 25 mm (0.08 to 1.0 inch) and flat samples up to 12 mm thick and 31 mm wide (0.5 inch by 1.25 inches). Wireforms are available for a wider range of specimen sizes.
- Model 3442 is recommended for specimen diameters <2 mm
Linearity: ≤0.15 % of full-scale measuring range
Temperature Range: Standard (-ST) is -40 °C to +100 °C (-40 °F to 210 °F)
Accuracy: Meets ASTM E83 class B-1 and ISO 9513 class 0,5 accuracy requirements. A test certificate is included
Cable: Integral, ultra-flexible cable, 2.5 m (8 ft) standard
Excitation: 5 to 10 VDC recommended, 12 VDC or VAC max
Operating Force: Depends on model configuration; 10 to 100 grams is typical
Output: 2 to 4 mV/V nominal, depending on model
Options
- Quick Attach Kit wireforms are designed for larger specimens
- Quick-Swap gauge lengths
- 3742-12: This is a gauge length pin adapter kit, specifically created for scenarios where utilizing a traditional pin to set the gauge length is advantageous, such as in non-ambient testing while wearing gloves. It also comes with rubber band and spring attachments for instances where these methods are preferred over the 3742’s Quick Attach wireforms.
- Specialty Knife Edges
- Temperature range options from -270 °C to +200 °C (-454 °F to +400 °F)
- Connectors are available to interface with almost any brand of testing equipment
- Specialized strain gage coatings and stainless steel knife edges are provided for biomedical testing at room temperature