| 摘要 |
A differential pressure transducer 10, primarily for measuring gauge pressure, comprises first and second identical, substantially cylindrical, sealed capsule assemblies, 30, 32, each having a circular diaphragm at one axial end, one being indicated at 44. The capsule assemblies are welded into the opposite ends of a cylindrical housing 16, 18, with the diaphragms facing outwardly. The housing is designed, 14, 20, to permit the transducer to be mounted in the wall of a pipe or chamber, with the diaphragm of one capsule subjected to the fluid pressure in the pipe or chamber and the diaphragm of the other capsule subjected to ambient atmospheric pressure. Respective inductive displacement sensors produce respective signals indicative of diaphragm displacement. The use of sealed capsules ensures that if a diaphragm ruptures, fluid loss cannot occur. Each capsule (Figure 2) may be formed with a tubular portion (38) projecting away from the diaphragm (44) and housing a displacement transducer core (55) mechanically coupled to the diaphragm (44), a set of transducer coils (58, 60) being dispersed around the tubular portion (38). <IMAGE> |
