DEVICE FOR DETERMINING AND/OR MONITORING THE MASS FLOW OF A FLUID MEDIUM

摘要

The invention relates to a thermal measurement device for determining and/or monitoring the mass flow of a fluid medium (3) through a pipeline (2) or through a measurement tube, comprising at least two temperature sensors (11, 12) and a regulation/analytical unit (10), both temperature sensors (11, 12) being resistance elements of which one is of a design which may be heated, both temperature sensors (11, 12) are arranged In a region of a housing (5) facing the medium (3) and are in thermal contact with the medium (3) flowing through the pipeline (2) or measuring tube. The regulation/analytical unit is provided with two differing precision resistances (R1, R2), the first precision resistance (R1) having a first defined value (Y1) and the second precision resistance (R2) having a second defined value (Y2), wherein the regulation /analytical unit (10) assigns a measured resistance (Rx1; Rx2) determined on a resistance element (11, 12) a measurement value (Y1; Y2) lying on a straight line (g) running through two calibration points ((R1, Y1), (R2, Y2)) provided by two precision resistances (R1,R2) and the regulation /analytical unit (10) determines the mass flow through the pipeline (2) or the measuring tube from the measured values (Y1,Y2) provided by the temperature sensors (11, 12).