Abstract: A diaphragm assembly for use in highly corrosive industrial applications includes a metal body subject to corrosion and a diaphragm formed of a corrosion resistant metal. The metal of the diaphragm is metallurgically incompatible with the body metal. The diaphragm is nevertheless hermetically sealed to the body with the aid of a transition member having a first portion of metal which is metallurgically compatible with the body and a second portion of another metal metallurgically compatible with the diaphragm. Both portions are joined together by a sound, molecular bond, as for example, by using explosive bonding techniques. The first portion of the transition member is fusion welded to the body and the diaphragm is similarly welded to the second portion, thereby presenting at the process fluid interface a barrier that consists solely of corrosion resistant metal.

Abstract: A method and apparatus for protecting the transducer in a liquid-filled differential pressure transmitter having stroke limited, isolation diaphragms from exposure to overrange pressure are disclosed. Bidirectional overrange pressure protection is provided through the use of a single, preloaded bellows that is restrained by a preloaded stop means preferably including a preloaded mechanical spring. The bellows remains stationary when the differential pressure transmitter is exposed to a normal, operational differential pressure. When an overrange pressure is applied to the transmitter, the bellows expands or contracts to accommodate the liquid displaced by either of the isolation diaphragms thereby protecting the transducer from the overrange pressure. Upon removal of the overrange pressure condition, the protection apparatus automatically resets itself.

Abstract: At least one of two wing-like elements that extend longitudinally alongside each other in the stream of a flowing fluid is pivotally mounted so as to oscillate at a frequency proportional to fluid flow rate. These elements, after being properly positioned with respect to each other, are readily inserted in large conduits to provide accurate measurement of line average flow rate over a wide range of values.

Abstract: A vortex flowmeter in which the vortex-shedder and the vortex sensor comprise two distinct, easily separable assemblies that may be readily removed and/or assembled from the interior of a flow conduit. The sensor is housed in a body fixedly suspended within the conduit by an integrally connected support structure extending outwardly through an opening in the conduit wall. The shedder comprises a blunt front face extending across the interior of the conduit for producing vortices and a bar-member joined to the front face and extending downstream therefrom defining an area for detecting the vortices. The bar-member is formed with a lateral recess that matches the pattern of the sensor and support structure such that when the shedder is positioned to engage the sensor, the overall bar-member configuration is preserved to assure good measurement results. Outside of the conduit, the support structure is securely fastened to the conduit so as to firmly hold the sensor within the shaped recess.