strain gauge force sensor

The difference is mostly in how the sensor is integrated and protected for field use. A standard load cell is often a self-contained cylinder that gets sandwiched between flat surfaces. Our strain gauge force sensors are frequently built to be welded onto structural steel, embedded in concrete, or threaded onto a rock bolt. The strain gauges are bonded directly to the load-bearing element, and the whole assembly is sealed against moisture and chemicals. So you are not just buying a transducer; you are getting a sensing element that becomes part of the structure.

Yes, many are designed for submerged use. We use double O-ring seals, welded construction, and potted cable exits to keep water out, even at pressures found in dam galleries or deep drill holes. The cable itself is often armored and has a vent tube to equalize pressure if the sensor is going very deep. That said, you should specify the submersion depth when ordering so we can verify the sealing details.

Standard output is millivolt per volt (mV/V), which works well up to about 100 meters of shielded cable if you use a good differential amplifier. For longer distances, we offer 4–20 mA current loop or digital RS-485 output. The 4–20 mA version can drive signals over several kilometers without degradation, which is practical for large dam sites or tunnelling projects.

Accuracy depends on the specific model, but typical non-linearity is within ±0.5% of full scale, and repeatability is better than ±0.2%. Long-term stability is more about the installation and cable integrity. If the sensor is properly mounted and the cable is protected from physical damage, you can expect years of reliable data with minimal drift. We provide calibration intervals, but many users check them with portable load frames in situ if recalibration is needed.

Custom work is a big part of what we do. If you have an unusual anchor head diameter, a confined space between structural members, or need a sensor that fits an existing bolt pattern, we can design to your specifications. Just provide the drawings and load requirements, and our engineering team will propose a configuration. Lead times for custom sensors are typically 6-8 weeks.