strain sensor

Spot-weldable gauges are used on exposed steel surfaces, like piles or tunnel ribs. You weld them directly onto the structure and they measure surface strain. Embedment gauges are cast into concrete during pouring; they have end flanges to lock into the material and measure internal strain.

Yes, standard models are IP68 sealed and can handle continuous submersion at typical geotechnical depths. The cable vent tube prevents water ingress along the cable, but let us know if you need deeper than 100 meters—we have additional sealing options.

The sensors output a millivolt signal from a full Wheatstone bridge. You’ll need a datalogger that can supply excitation voltage (2–5 V) and read mV signals. We can provide wiring diagrams and even pre-configure the logger scaling factors if you tell us your system.

We customize gauge length and backing material to shift the measurement range. Just send us your expected strain limits and the host material, and we’ll propose a configuration. There’s a small NRE fee, but the turnaround is usually under 3 weeks.

With proper installation, 10 years or more is typical. The weak points are usually cable damage or corrosion at exposed connectors. We can supply armoured cable and welding sleeves for extra durability if that’s a concern.