Diaphragm pump protective system

Claim 1

IN A FLUID OPERATING APPARATUS, TWO PLATES DEFINING A CHAMBER THEREBETWEEN, A COMPOSITE DIAPHRAGM ASSEMBLY EXTENDING ACROSS SAID CHAMBER AND CLAMPED AT ITS PERIPHERTY TO DIVIDE SAID CHAMBER INTO TWO HALF-CHAMBERS, RESPECTIVE INTAKE AND DISCHARGE CONDUIT MEANS CONNECTED TO ONE OF SAID HALF-CHAMBERS FOR THE INTAKE AND DISCHARGE OF A FIRST FLUID INTO AND FROM SAID ONE OF SAID HALF-CHAMBERS, AN OPERATING FLUID CONTAINING FLUROESCENT MATERIAL, MEANS TO ADMIT SAID OPERATING FLUID INTO AND TO DISCHARGE SAID OPERATING FLUID FROM THE OTHER HALF-CHAMBER, SAID DIAPHRAGM ASSEMBLY COMPRISING AT LEAST A FIRST AND A SECOND LAMINATION RESPECTIVELY ADJACENT SAID ONE AND SAID OTHER HALF-CHAMBER, THE PLATE CONTAINING SAID OTHER HALFCHAMBER BEING FORMED WITH A PERIPHERAL RECESS OUTWARDLY OF ITS CLAMPING AREA, SEALING MEANS ARRANGED BETWEEN THE PLATES OUTWARDLY OF SAID RECESS, SAID FIRST LAMINATION BEING FORMED WITH OUTWARDLY EXTENDING GROOVES FACING THE SECOND LAMINATION AND EXTENDING ACROSS THE CLAMPING AREA, CONDUIT MEANS CONNECTED TO SAID RECESS AND INCLUDING A