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Strain gauge accessories for reliable installation and protection
Accurate strain measurements depend on a reliable connection between the strain gauge and the test specimen. Selecting the correct adhesive, preparing the surface and protecting the installed gauge are essential steps in creating a stable measurement point.
Althen offers strain gauge accessories, including adhesives and protective coatings, for the installation and protection of electrical resistance strain gauges. The appropriate materials depend on the test specimen, strain gauge type, measurement duration and operating environment.
How do you choose the right strain gauge adhesive?
A strain gauge adhesive transfers mechanical deformation from the specimen surface to the measuring grid. Poor bonding can affect strain transfer and measurement stability, while an incompatible adhesive may fail under the intended operating conditions.
When selecting an adhesive, consider:
- Test material: The adhesive must be suitable for the surface, such as metal, plastic or composite material.
- Operating temperature: Check both installation and measurement temperature requirements.
- Expected strain: Confirm that the adhesive can accommodate the expected deformation, particularly for large-strain tests.
- Curing conditions: Consider curing time, temperature, pressure and any required equipment.
- Measurement duration: Distinguish between short laboratory tests and long-term monitoring.
Why are protective coatings important?
After bonding and connecting the strain gauge, the measurement point may require protection against moisture, contamination and mechanical damage. The appropriate protective coating depends on the environment and the duration of the measurement.
Protective materials can help reduce exposure to humidity, splashes and other environmental influences. However, not every coating provides full waterproofing or suitability for permanent immersion. Check the protection requirements for the complete installation.
What is needed for a complete strain gauge installation?
A typical installation process includes:
- Preparing and cleaning the specimen surface.
- Positioning and bonding the strain gauge using a suitable adhesive.
- Connecting the lead wires and checking the electrical circuit.
- Applying protective materials where necessary.
- Verifying the installation and measurement signal before testing.
The exact procedure depends on the gauge series, specimen material and measurement conditions.
What should you consider when selecting strain gauge accessories?
- Compatibility: Check that the adhesive and protective coating are suitable for the specific strain gauge and specimen.
- Environmental exposure: Consider temperature, humidity, water, chemicals and mechanical influences.
- Measurement requirements: Determine whether the installation is intended for short-term testing or long-term monitoring.
- Electrical connections: Ensure suitable wiring, insulation and strain relief for the measurement setup.
- Installation instructions: Follow the product-specific application, curing and safety procedures.
Consult the individual product datasheets and installation instructions before combining adhesives, protective coatings and strain gauges.
Technical guides & resources
Let's discuss your strain gauge installation requirements
We can help you select compatible adhesives and protective materials, assess environmental conditions and plan a reliable installation for your application.