Pressure transducer with welded tantalum diaphragm

An improved pressure transducer for use with corrosive process fluids comprising:

• (a) a stainless steel body containing a chamber and having a passage from said cavity terminating at an outer face;
• (b) a position transducer disposed in said chamber;
• (c) a tantalum isolation diaphragm disposed adjacent said outer face and in contact around the periphery of said isolation diaphragm, said isolation diaphragm being continuously brazed to said outer face around the periphery of said diaphragm;
• (d) fill fluid disposed in said chamber to contact said position transducer, said passage and between said isolation diaphragm and said outer face;
• (e) a stainless steel weld ring disposed adjacent said isolation diaphragm and in contact around the periphery of said isolation diaphragm, said weld ring being continuously brazed to said isolation diaphragm and continuously welded to said body around the periphery of said weld ring;
• (f) an elastomeric seal disposed continuously around the inner periphery of said weld ring;
• and,
• (g) a stainless steel pressure body disposed and held continuously against said weld ring and said seal whereby said seal is subjected to a deformation force between said isolation diaphragm and said pressure body sufficient to seal the process fluid from contacting said weld ring.