公开(公告)号：US3643510A

公开(公告)日：1972-02-22

申请号：US3643510D

申请日：1969-12-17

Applicant: LIQUIDONICS INC

Inventor： LISSAU FREDERIC

IPC: G01L1/02 ,  G01L19/04

CPC classification number: G01L1/02 ,  G01L19/04

Abstract: Fluid displacement pressure gauges have pressure responsive elements which displace gauging fluid in readout tubes. Gauging fluid can be located inside or outside the pressure responsive elements. The pressure responsive elements may be capsules with flexible walls or tubular members with flat, curved, corrugated or round walls. Temperature-compensating means and spring rate adjustment means are provided to improve accuracy of reading precision instruments. Hermetically sealed gauges can be used in any position. Readout tubes may have bores of different sizes to improve readout resolution. Differently colored gauging fluids in the readout tubes serve to improve readability. Automatic compensation means may be provided to compensate for variations in fluid volume due to temperature changes. Readout tubes can be provided with means to eliminate parallax in reading scales. Readout tubes and scales can be coiled to improve readout resolution without increasing overall scale height.

Abstract translation: 流体位移压力计具有压力响应元件，其使读出管中的测量流体移位。 测量流体可以位于压力响应元件的内部或外部。 压力响应元件可以是具有柔性壁或具有平坦，弯曲，波纹或圆形壁的管状构件的胶囊。 提供温度补偿装置和弹簧速率调节装置，以提高读取精密仪器的精度。 密封式压力表可用于任何位置。 读出管可以具有不同尺寸的孔以提高读出分辨率。 读出管中的不同颜色的测量流体用于提高可读性。 可以提供自动补偿装置以补偿由于温度变化导致的流体体积的变化。 读数管可以提供消除阅读量表视差的手段。 读数管和刻度盘可以卷绕，以提高读数分辨率，而不会增加总体刻度高度。

公开(公告)号：US3611811A

公开(公告)日：1971-10-12

申请号：US3611811D

申请日：1970-03-27

Applicant: LIQUIDONICS INC

Inventor： LISSAU FREDERIC

IPC: G01L7/18

CPC classification number: G01L7/18

Abstract: A MANOMETER FOR ACCURATELY MEASURING EXTREMELY SMALL CHANGES IN FLUID PRESSURES EMPLOYS AN INVERTED VERTICAL USHAPED TUBE ASSEMBLY HAVING A NARROW UNIFORM BORE THROUGHOUT ITS LENGTH. TWO UPWARDLY TURNED LEG PORTIONS ARE CONNECTED TO TWO CONTAINERS OR EQUAL SIZE CONTAINING TWO FLUIDS OF DIFFERENT COLORS AND DENSITIES. THE FLUIDS FILL THE TUBE AND MEET AT A MENISCUS WHOSE POSITION IN THE TUBE IS READ ON A GRADUATED SCALE ADJACENT TO THE TRANSPARENT TUBE. THE SCALE IS ADJUSTABLY MOVABLE ALONG THE TUBE. THE HEIGHT OF ONE OCNTAINER IS ALSO ADJUSTABLE. EITHER ONE OF THE CONTAINERS MAY BE OPEN TO THE ATMOSPHERE WHILE THE OTHER CONTAINER IS OPEN TO A SOURCE OF VARIABLE PRESSURE. ANY CHANGE IN THE VARIABLE PRESSURE PRODUCES A CHANGE IN SCALE READING. THE DISTANCE THE MENISCUS MOVES UPON A CHANGE IN PRESSURE DEPENDS ON THE RATIO OF DENSITIES AND RATIO OF CROSS SECTIONAL AREA OF ONE CONTAINER TO CROSS SECTIONAL AREA OF THE BORE OF THE TUBE.

公开(公告)号：US3610046A

公开(公告)日：1971-10-05

申请号：US3610046D

申请日：1970-03-27

Applicant: LIQUIDONICS INC

Inventor： LISSAU FREDERIC

IPC: G01L1/02 ,  G01L13/04 ,  G01L7/08

CPC classification number: G01L1/02 ,  G01L13/04

Abstract: A DIFFERENTIAL PRESSURE GAUGE INCLUDES A U-SHAPED TRANSPARENT TUBE HAVING LEGS AT ITS ENDS CONNECTED TO TWO IDENTICAL CLOSED PRESSURE RESPONSIVE ELEMENTS ENCLOSED IN CASINGS TO WHICH CONDUITS FROM TWO DIFFERENT PRESSURE SOURCES ARE CONNECTED. THE TUBE AND PRESSURE RESPONSIVE ELEMENTS ARE FILLED WITH TWO DIFFERENT FLUIDS MEETING AT A MENISCUS IN THE TUBE. A SCALE ADJACENT TO THE TUBE INDICATES THE POSITION OF THE MENISCUS AND PROVIDES A READING OF ANY CHANGE IN POSITION DUE TO CHANGE IN RELATIVE PRESSURES APPLIED TO THE TWO ELEMENTS. TWO IDENTICAL CLOSED EXPANSIBLE PRESSURE RESPONSIVE MEMBERS ARE CON-

NECTED TO THE TWO LEGS OF THE TUBE TO EXPAND AND CONTACT EQUALLY WHEN PRESSURE IN THE TUBE CHANGES. VOLUME ADJUSTMENT MEANS MAY BE CONNECTED TO THE TUBE FOR ADJUSTING RELATIVE VOLUMES OF THE FLUIDS IN THE TUBE IN ACCORDANCE WITH ANY DIFFERENCE IN THERMAL COEFFEIENTS OF EXPANSION OF THE FLUIDS IN THE TUBE.