Protection device of two flange changer diaphragms

The utility model discloses a protection device of two flange changer diaphragms arranges the storage tank outside in, be equipped with flange and lower flange on the storage tank, protection device includes isolation tank and changer, the isolation tank of isolation tank upper portion air inlet go up the flange with go up flange joint, the isolation tank bottom is equipped with the isolation tanklower flange to inside isolation tank, the top of isolation tank lower flange is equipped with the diaphragm isolation tank installs inside has the isolation liquid that is used for the submergence diaphragm, isolation tank lower flange and 1# changer flange joint to through the capillary with the negative pole of changer links to each other, the capillary that the changer positive pole was drawnforth passes through 2# changer flange and lower flange joint. The utility model discloses can realize the isolation of measurement medium and changer measurement diaphragm, effectively avoid the emergence of flange formula c