Measuring and testing – Speed – velocity – or acceleration – With means for retaining reading
Patent
1976-11-12
1977-09-06
Woodiel, Donald O.
Measuring and testing
Speed, velocity, or acceleration
With means for retaining reading
29157R, 29454, 73398R, 73407R, G01L 708
Patent
active
040460100
ABSTRACT:
A pressure transducer and method of manufacture is disclosed wherein a tantalum diaphragm is held in position in a pressure transducer by sandwiching the tantalum diaphragm between a stainless steel weld ring and the stainless steel body of the pressure transducer. The stainless steel weld ring is welded to the stainless steel body at a temperature above the melting point of the stainless steel but below the melting point of the tantalum whereby simultaneous to the welding of the weld ring to the body, a braze is created between the tantalum diaphragm and both the stainless steel weld ring and stainless steel body. This braze creates the required hermetic seal between the tantalum diaphragm and the stainless steel body. Additionally, an inert seal is provided between the pressure body of the transducer and the tantalum diaphragm disposed interior of the inner circumference of the stainless steel weld ring whereby process fluids which would otherwise erode the weld ring are isolated therefrom.
REFERENCES:
patent: 3072150 (1963-01-01), Hastings et al.
patent: 3239827 (1966-03-01), Werner et al.
patent: 3324727 (1967-06-01), Smith et al.
Beckman Instruments Inc.
Harder Paul R.
Steinmeyer Robert J.
Streck Donald A.
Woodiel Donald O.
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