Pressure or pressure-difference measuring apparatus with a pressure sensor device protected against overload

A differential pressure measuring apparatus comprising:

• a central pickup body;
• a measuring chamber, having a first and second subchamber;
• a pressure sensor device disposed in said measuring chamber;
• first and second separating diaphragms attached to said central pickup body and forming first and second antechambers between said first and second separating diaphragms and said central pickup body;
• first and second connecting canals connecting said first and second subchambers to said first and second antechambers, respectively;
• first and second supplementary chambers disposed in said central pickup body adjacent said first and second antechambers, respectively;
• first and second supplementary diaphragms resting against the central pickup body with pre-tension, said first and second supplementary diaphragms being disposed in said first and second supplementary chambers, respectively;
• first and second single supplementary canals connecting respectively said first and second connecting canals to sides of said second and first supplementary diaphragms opposite said second and first antechambers, respectively;
• and
• first and second auxiliary canals connecting respectively said first and second supplementary chambers to spaces adjacent said first and second separating diaphragms on sides thereof opposite said first and second antechambers, respectively.

A method of constructing a differential pressure measuring apparatus comprisings the steps of:

• disposing a pressure sensor device in a measuring chamber, having a first and second subchamber;
• attaching first and second separating diaphragms to a central pickup body to form first and second antechambers between said first and second separating diaphragms and said central pickup body;
• connecting said first and second subchambers to said first and second antechambers with first and second connecting canals;
• disposing first and second supplementary diaphragms against said central pickup body, the steps of attaching said separating diaphragms and disposing said supplementary diaphragms being performed so that said first and second supplementary diaphragms are located in said first and second antechambers adjacent said first and second separating diaphragms, respectively;
• fastening said supplementary diaphragms to said central pickup body within the respective ones of said antechambers;
• pretensioning said first and second supplementary diaphragms against the central pickup body;
• and
• connecting said first and second connecting canals respectively to sides of said second and first supplementary diaphragms opposite said second and first separating diaphragms with single first and second supplementary canals.

A method of constructing a differential pressure measuring apparatus comprising:

• disposing a pressure sensor device in a measuring chamber, having a first and second subchamber,
• attaching first and second separating diaphragms to a central pickup body to form first and second antechambers between said first and second separating diaphragms and said central pickup body;
• connecting said first and second subchambers to said first and second antechambers with first and second connecting canals, respectively;
• disposing first and second supplementary diaphragms against said central pickup body in first and second supplementary chambers located adjacent said first and second antechambers, respectively;
• connecting, by a first and a second auxiliary canal, said first and second supplementary chambers to respective spaces located adjacent said first and second separating diaphragms opposite said first and second antechambers, respectively;
• pretensioning said first and second supplementary diaphragms against the central pickup body;
• and
• connecting said first and second connecting canals respectively to sides of said second and first supplementary diaphragms opposite said second and first antechambers with single first and second supplementary canals.