Apparatus for preventing fouling of ph meter electrodes with filter element transporting means

Claim 1

APPARATUS FOR SUPPLYING FILTERED LIQUID TO A PH MEASUREMENT CELL THAT HAS AT LEAST TWO ELECTRODES THEREIN FOR PROJECTION INTO THE FILTERED LIQUID WITHIN THE CELL, FOR MEASURING THE PH THEREOF, COMPRISING: MEANS PROVIDING A FLOWING SUPPLY OF LIQUID TO BE SAMPLED, WITH AN EXPOSED UPPER SURFACE FROM WHICH A SAMPLE CAM BE DRAWN; A SAMPLING HEAD THAT IS FORMED WITH A FACE THAT CONFRONTS SAID LIQUID SURFACE AND THAT IS FORMED WITH AT LEAST ONE OPENING THROUGH WHICH LIQUID CAN BE DRAWN INTO SAID HEAD; CONDUIT MEANS INTERCONNECTING AND COMMUNICATING WITH THE OPENING IN SAID LIQUID SAMPLING HEAD AND SAID CELL; AN ELONGATE FILTER ELEMENT, A PART OF WHICH IS INTERPOSED BETWEEN THE SAMPLING HEAD, OVER SAID OPENING, AND THE UPPER SURFACE OF THE LIQUID, IN CONTACT WITH SAID LIQUID SURFACE, SAID FILTER ELEMENT BEING RESISTANT TO THE LIQUOR BEING FILTERED AND OF A MATERIAL WHICH WILL NOT ALTER THE CHARACTER OF THE FILTRATE; MEANS FOR EFFECTING THE CONTINUOUS TRANSPORT OF SAID ELEMENT ACROSS SAID OPENING DURING OPERATION OF SAID APPARATUS, THEREBY TO PRESENT A CONTINUOUSLY RENEWED FRESH PORTION OF THE FILTER ELEMENT TO THE LIQUID, AND MEANS FOR CONTINUOUSLY EFFECTING TRANSPORT OF SAID LIQUID THROUGH SAID FILTER ELEMENT, OPENING, CONDUIT MEANS, AND CELL, TO PERMIT CONTINUOUS PH MEASUREMENTS TO BE MADE.