Figure 2.4.6 A diaphragm

Figure 2.4.7 Schematic of Capsule and Bellow

Figure 2.4.8 Bellow with a LVDT [1]

Capsule is formed by combining two corrugated diaphragms. It has enhanced sensitivity in comparison with that of diaphragms. Figure 2.4.7 shows a schematic of a Capsule and a Bellow. A stack of capsules is called as ‘Bellows’. Bellows with a LVDT sensor measures the fluid pressure in terms of change in resultant voltage across the secondary coils of LVDT. Figure 2.4.8 shows a typical arrangement of the same.