Device for Determining and/or Monitoring the Mass Flow Rate of a Gaseous Medium

Abstract

The invention relates to an apparatus for determining and/or monitoring mass flow of a gaseous medium through a pipeline (2) or through a measuring tube. The apparatus includes two temperature sensors (11, 12) and a control/evaluation unit (10). The two temperature sensors (11, 12) are arranged in a housing (5) facing the medium (3) and are in thermal contact with the medium flowing through the pipeline (2) or through the measuring tube. A first temperature sensor (11) is embodied to be heatable. A second temperature sensor (12) provides information concerning current temperature of the medium (3). The control/evaluation unit (10), on the basis of a temperature difference (ΔT) between the two temperature sensors (11, 12) and/or on the basis of heating power (Q) supplied to the first temperature sensor (11), ascertains mass flow of the medium (3). The control/evaluation unit (10), based on at least one additional process variable (p, T, v) of the flowing medium (3), ascertains a corrected value for the mass flow ascertained based on the temperature difference (ΔT) or the supplied heating power and makes available a corrected value (Qinc) for the mass flow through the pipeline (2) or through the measuring tube.

Dependencies are inferred from the claim text.