vibrating wire load cell

It relies on tension changes in a high-strength steel wire. When load deforms the load-bearing element, the wire tension shifts, so does its resonant frequency. An electromagnetic coil plucks the wire and picks up the frequency, which is then converted to load using calibration constants. The principle is simple and delivers excellent long-term stability.

Yes, when specified with proper sealing. Most Kingmach vibrating wire load cells have IP68-rated stainless steel housings and epoxy-sealed cable entries, making them fine for submerged conditions like dam foundations or deep wells. Just confirm with our team that the cable length and connector options match the submersion depth.

A built-in thermistor measures the temperature, and correction coefficients are provided with the calibration sheet. The datalogger usually applies automatic compensation. The net thermal effect tends to be small because both the wire and the cell body expand, but compensation is still useful in environments with large temperature swings to keep accuracy within spec.

The load cell is placed between bearing plates at the pile top or embedded within the pile body during construction. Alignment must be precise to avoid eccentric loading. Cables are protected during concrete pouring. A dummy cell or witness sensor is sometimes used to check survivability. After curing, a baseline reading is taken before any test load is applied.

The output is a frequency, not a voltage or current. Frequency signals are far less sensitive to cable resistance changes and electromagnetic noise. With properly shielded cable, runs of several kilometers are feasible without signal loss, which is why vibrating wire sensors are preferred for remote dam or tunnel monitoring.