Differential pressure capsule with temperature compensation |
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| 申请号 | US3620135D | 申请日 | 1969-02-07 | 公开(公告)号 | US3620135A | 公开(公告)日 | 1971-11-16 |
| 申请人 | FOXBORO CO; | 发明人 | BOWDITCH HOEL L; | ||||
| 摘要 | IN A MOTION BALANCE CAPSULE FOR MEASUREMENT OF DIFFERENTIAL PRESSURES IN PROCESS APPLICATIONS, A PAIR OF MATCHED DIAPHRAGMS EACH EXHIBITING A SIMILAR CHANGE IN EFFECTIVE AREA WITH STROKE ARE EMPLOYED TO COMPENSATE TEMPERATURE EFFECTS, THE DIAPHRAGMS ARE SET TO A STROKE YIELDING EQUAL EFFECTIVE AREAS FOR NO DIFFERENTIAL PRESSURE, WITH THE APPLICATION OF PRESSURE, AND WITH A TEMPERATURE CHANGE AFFECTING FILL VOLUME, THE FILL WILL ACT UPON THE DIFFERENCE IN EFFECTIVE AREAS OF THE STROKED DIAPHRAGMS TO PRODUCE A TENDENCY TO OFF-SET THE TEMPERATURE EFFECT UPON THE SPRING RATE OF THE CAPSULE ASSEMBLY, INCLUDING THE MOTION BALANCE SPRING. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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