ABSTRACT
This chapter is primarily concerned with the measurement of powder pressure. It also describes load cells, which are widely utilized in hopper scales or belt scales. The chapter also discusses measurement of fluid pressure because some technical considerations are involved when particles are suspended in the fluid. Powder pressure is a normal component of stress exerted by particles. Powder pressure acting on the wall may take a fairly high value in such a dynamic state. Pressure gauges set on the wall should therefore have enough strength against the highest pressure caused by the powder flow. Strain gauges are most widely utilized in pressure transducers. Some pressure transducers utilize differential transformers so as to detect the deformations or strains. As in the case of an electric transformer, two types of coils (called the primary coil and the secondary coil) are formed on a cylindrical bobbin. Pressure gauges of Parallel-plate are widely used in powder pressure measurements.
