Dynamically isolated vortex sensing pressure transducer

An apparatus for measuring flow rate of fluid comprising in combination:

• a) a flow passage;
• b) means for generating vortices in a stream of fluid moving through the flow passage;
• c) means for converting an oscillation in differential pressure to an alternating electrical signal;
• d) a first pressure communicating hole with one end exposed to a first fluid pressure and the other end connected to a first pressure compartment included in said means for converting an oscillation in differential pressure to an alternating,electrical signal, wherein at least a portion of the first pressure communicating hole include a conduit with low stiffness disposed intermediate the flow passage and said means for converting an oscillation in differential pressure to an alternating electrical signal, and a second pressure communicating hole with one end exposed to a second fluid pressure and the other end connected to a second pressure compartment included in said means for converting an oscillation in differential pressure to an alternating electrical signal, wherein at least a portion of the second pressure communicating hole includes a conduit with low stiffness disposed intermediate the flow passage and said means for converting an oscillation in differential pressure to an alternating electrical signal;
• wherein an oscillation in differential pressure between the first and second fluid pressures is associated with generation of vortices by said means for generating vortices, and the oscillation in differential pressure between the first and second fluid pressures generates the alternating electrical signal.