公开(公告)号：US3616696A

公开(公告)日：1971-11-02

申请号：US3616696D

申请日：1969-08-04

申请人： JOHANNA PLASTICS

发明人： LUDLOW THOMAS B ,  SKILDUM JOHN D

IPC分类号： G01N9/10 ,  G01N31/22

CPC分类号： G01N31/221 ,  G01N9/10

摘要： BECAUSE THE CORROSIVENESS AND FREEZING POINT OF RADIATOR COOLANT ARE RELATED, THE SUITABILITY OF THE COOLANT DEPENDS ON BOTH FACTORS. TO DETERMINE THE CONDITION OF THE COOLANT IN ACCORDANCE WITH THE INVENTION THE PH AND SPECIFIC GRAVITY ARE MEASURED SIMULTANEOUSLY. THIS IN ACCOMPLISHED BY PLACING A PH MEASURING COLOR INDICATOR ON THE NOZZLE OR OTHER PORTION OF A HYDROMETER THAT IS ADAPTED TO ENTER THE SOLUTION WHEN THE HYDEOMETER IS FILLED. IN A PREFERRED FORM OF THE INVENTION INDICATOR CONSISTS OF A MATRIX COMPOSED OF A CONTINUOUS PHASE OF A MOISTURE PERMEABLE MATERIAL IN WHICH IS DISPERSED A WATER INSOLUBLE PH SENSITIVE INDICATOR.