Pressure transducer apparatus

A fluid pressure transducer apparatus comprising:

• (A) a fluid pressure transducer means including:
• (A-i) a fluid pressure detection means, having a detection surface of a fluid pressure, for converting a fluid pressure into an electrical signal, and
• (A-ii) a chamber, formed on said detection surface, for storing a fluid;
• and
• (B) a path means, selectively communicating said chamber with a fluid pressure measurement portion, for transmitting a fluid pressure of the measurement portion to said detection surface, said path means including:
• (B-i) a cylindical member having a first port communicating with said chamber and a plurality of second ports arranged on a surface substantially perpendicular to an axis of said cylindrical member, said first port being arranged on an upper portion of said cylindrical member, and
• (B-ii) a stop cock arranged in said cylindrical member to be slidable with respect to an inner surface of said cylindrical member, said stop cock having a path defined therein and handle means for slidably rotating said stop cock in said cylindrical member through a predetermined angle so that said path communicates said first port with only one of said plurality of second ports and no other second ports communicate with each other, said stop cock further having an annular groove communicating with said first port and a substantially vertical groove communicating said annular groove and said second ports one at a time.