公开(公告)号：JPS5629134A

公开(公告)日：1981-03-23

申请号：JP6234880

申请日：1980-05-13

Applicant: ROSEMOUNT INC

Inventor： JIERARUDO AARU KUTSUSHII

IPC: G01L1/10 ,  G01L9/00 ,  G01L13/02

公开(公告)号：JPH03108628A

公开(公告)日：1991-05-08

申请号：JP13568289

申请日：1989-05-29

Applicant: ROSEMOUNT INC

Inventor： JIERARUDO AARU KUTSUSHII

IPC: G01L1/10 ,  G01L9/00 ,  G01L13/02

Abstract: PURPOSE: To improve measurement accuracy by fixing a drive means and a frequency detection means relative to each other, connecting them on a substrate on the same side of a vibration beam in one piece, and providing a shaft in the longitudinal direction that is nearly vertical to the shaft in the longitudinal direction of the vibration beam at the drive means. CONSTITUTION: When a tongue 23 between bellows 15 and 16 is moved due to the deviation or move of the bellows, a pivotal shaft lever part 30 is subjected to pivotal shaft move around a pivot 27 by the tongue 23. The move gives a change in the tension and compression force of a vibration beam 42, and the resonance frequency of vibration is changed. The change in the resonance frequency is proportional to the difference of pressure at pressure entrances 20 and 21, and hence the bellows 15 and 16. Since one pressure entrance is connected to atmosphere or vacuum, the difference of the pressures is measured. Also, isolation parts 43 and 44 have masses 43A and 44A that are extended vertically to the beam 42 and have separation springs 43B and 43C and 44B and 44C each. The separation materials retain the beam 42 in a nonconnected state with the placement part of the edge part, thus decreasing energy loss that causes the quality of the beam 42 to deteriorate.