Hydraulic load cells are also referred to as hydrostatic load cells. These are mainly used in industrial applications. These are force -balance devices, measuring weight as a change in pressure of the internal filling fluid.
They give linear output reasonably unaffected by the amount of the filling fluid or by its temperature. Accuracy can be achieved within 0.25% full scale or better, provided the load cells have been correctly installed and calibrated. This range of accuracy is suitable for most process weighing applications. Since this sensor has no electric components, it is perfect for use in hazardous areas.
Typical hydraulic load cell applications include tank, bin, and hopper weighing. These load cells can eliminate troubles encountered with strain gauge load cells. Hydraulic load cell is probably the best load cell to use in an outdoor environment because it is immune to transient voltage (lighting).