公开(公告)号：US4312240A

公开(公告)日：1982-01-26

申请号：US155169

申请日：1980-06-02

Applicant: Henry M. Hermanns

Inventor： Henry M. Hermanns

IPC: G01F1/22

CPC classification number: G01F1/22

Abstract: A flowmeter of the variable area type capable of measuring corrosive liquids and gases and including a metal metering tube having a corrosion-resistant PTFE liner. To match the corrosion-resistance properties of the lined metering tube, the float assembly operating within the tube is mainly of FEP construction, the float head of the assembly which engages the inner wall of the metering tube being constructed of tantalum.

Abstract translation: 一种能够测量腐蚀性液体和气体的可变区域型流量计，并且包括具有耐腐蚀PTFE衬垫的金属计量管。 为了匹配内衬计量管的耐腐蚀性能，在管内工作的浮子组件主要是FEP结构，组件的浮动头与计量管的内壁接合，由钽构成。

公开(公告)号：US4112960A

公开(公告)日：1978-09-12

申请号：US779511

申请日：1977-03-21

Applicant: Henry M. Hermanns

Inventor： Henry M. Hermanns

IPC: F15C3/10 ,  G01L7/06 ,  G01L9/00 ,  G05B11/44

CPC classification number: F15C3/10 ,  G01L7/06 ,  G01L9/0033 ,  Y10T137/2322 ,  Y10T137/2409

Abstract: A range spring sub-assembly providing a variable gradient with minimum hysteresis for the feedback assembly of a pneumatic transmitter. The sub-assembly is constituted by a helical spring whose lower end is secured to the pivoted feedback arm of the feedback assembly and whose upper end is coupled by a span adjustment screw to a fixed arm thereof. The arm porton of the screw extending above the fixed arm is engaged by a zero adjustment knob which rests on top of the fixed arm, whereby when the knob is turned, the screw is axially shifted to vary the tension of the spring coupled thereto. The span adjustment screw has a coupling terminal head that is received within the upper end of the spring and is provided with a set of outwardly projecting pins. The pins are at different heights and are interposed between adjacent convolutions of the spring whereby the pinned convolutions are rendered inactive and the convolutions therebelow remain active. By rotating the screw, the number of active convolutions is varied, thereby varying the gradient of the spring.