MEASUREMENT INSTALLATION AND PROCEDURE FOR THE DETERMINATION OF THE FILLING LEVEL IN LIQUID CONTAINERS, PREFERABLY FOR TANK FACILITIES, AND USE OF AN ACOUSTIC WAVE GUIDE.

摘要

IN A MEASURING DEVICE FOR CONTAINERS (20) FILLED WITH A FLUID (10), PREFERABLY FOR TANK FACILITIES, THE HYDRAULIC LEVEL H IS DETERMINED SINCE THE CIRCULATION OF ULTRASONIC IMPULSES WHICH ARE THROUGH SOME MORE IMPROVERS. ) ALONG A MAIN MEASURING FIELD (8) THAT EXTENDS FROM THE BOTTOM REGION OF THE TANK (20) TO THE HYDRAULIC SURFACE (9, 9``) AND IS REFLECTED FROM THE HYDRAULIC SURFACE (S1) TO FIRST RECEIVERS OF SOUND IMPULSES (S1). SOME MEANS AS TEMPERATURE SENSORS (14, 15, 16) ARE PROVIDED TO SEEK THE DISTRIBUTION OF THE TEMPERATURE THROUGHOUT THE WHOLE HYDRAULIC LEVEL H. THE PROCESSING OF THE MEASURES PROVIDES AN AVERAGE TEMPERATURE TM IN THE HYDRAULIC VOLUME. IN ADDITION TO THE MAIN MEASUREMENT FIELD (8) THERE IS A REFERENCE FIELD (11) IN THE HYDRAULIC VOLUME WITH SOME SECOND TRANSMITTERS AND RECEIVERS OF SOUND IMPULSES (S2) AND A SENSOR OF THE REFERENCE TEMPERATURE (14) TO MEASURE A REFERENCE TEMPERATURE T SUB REF. THE REFERENCE FIELD MAKES IT POSSIBLE TO SEARCH THE SPEED OF THE SOUND V ELEVATED * (T SUB REF) IN THE HYDRAULIC VOLUME AT THE REFERENCE TEMPERATURE T SUB REF FROM THE DIFFERENCE MEASURED AT THE TIME OF THE CIRCULATION SO THAT THEY CAN FIND A CORRECTED SPEED OF SOUND TEMPERATURE V (T) IN THE HYDRAULIC VOLUME: V (T) = V HIGH * (T SUB REF) [1 + K SUB K. DELTA T] AND SO A CORRECTED LEVEL OF TEMPERATURE H (T) = V (T) .TH IN WHICH DELTAT = TM REF YK SUB K IS A MEDIUM-DEPENDENT CORRECTION FACTOR. THE SUBJECT OF THE INVENTION ALSO INCLUDES A PROCESS TO DETERMINE THE LEVEL AND THE ADVANTAGEOUS USE OF A MEASURING TUBE (24) CONSISTING OF A FIRST AND A SECOND SOUND WAVE GUIDE (4, 5).