Method for Control of a Thermal/Calorimetric Flow Measuring Device
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United States of America Patent
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Issued Date -
Dec 18, 2008
app pub date -
Dec 16, 2005
filing date -
Jan 13, 2005
priority date (Note) -
Abandoned
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Abstract
A method for control of a thermal, or calorimetric, flow measuring device, which ascertains and/or monitors, by means of two temperature sensors, the flow of a measured medium through a pipeline or measuring tube in a process, wherein the current temperature (T.sub.i) of the measured medium is ascertained at a point in time (t.sub.i) via a first temperature sensor, wherein, to a second temperature sensor, a defined heating power is supplied, which is so sized that a predetermined temperature difference (.THETA..sub.target) occurs between the two temperature sensors, and wherein, in the case of a deviation (.THETA..sub.target-.THETA..sub.i) of the current temperature difference .THETA..sub.i measured in the actual-state from the temperature difference (.THETA..sub.target) predetermined for the target-state, at a following point in time (t.sub.i+1) , the heating power (Q.sub.i+1) supplied to the heatable temperature sensor is ascertained The heating power (Q.sub.i+1) is determined taking into consideration physical conditions in the process, as such are reflected in a time constant (.tau.).
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