Patent ID: 8583385

Claim:
A method for registering flow and flow direction of measured medium in a measuring tube with thermal, flow measuring device comprising: the method comprising the steps of: producing measured values representing temperature of the measured medium T medium;actual (t) at points in time t=t 0 , t 1 , t 2 , t 3 , . . . t n , with nεN; at the point in time t 1 a first heating power (P 1 ) is consumed by the first heatable resistance thermometer P 1,1 (t 1 ); at the point in time t 2 a second heating power (P 2 ) is consumed by the second heatable resistance thermometer P 2,2 (t 2 ); the first heatable resistance thermometer provides a first measured value of temperature T 1,heated;actual (t=t 1 ) at a point in time t 1 ; calculating a first coefficient PC 1 (t=t 1 ) representing flow of the measured medium through the measuring tube as a function of the heating power P 1,1 (t 1 ) consumed by the first resistance thermometer, the temperature of the measured medium T medium;actual (t 1 ) and the temperature of the first heatable resistance thermometer T 1,heated;actual (t 1 ); the second heatable resistance thermometer provides a second measured value of temperature T 2,heated;actual (t=t 2 ) at a point in time t 2 ; and a second coefficient PC 2 (t=t 2 ) is calculated as a function of the heating power P 2,2 (t 2 ) consumed by the second resistance thermometer, the temperature of the measured medium T medium;actual (t 2 ) and the temperature of the second heatable resistance thermometer T 2,heated;actual (t 2 ); a value of a decision coefficient is calculated as a function of the first coefficient PC 1 (t 1 ) and the second coefficient PC 2 (t 2 ); the value of the decision coefficient (DC) indicates a flow of the measured medium in the measuring tube in a first direction when the value of the decision coefficient (DC) lies above a fixed limit value; the value of the decision coefficient (DC) indicates a flow of the measured medium in the measuring tube in a second direction when the value of the decision coefficient (DC) lies below the fixed limit value; and the second direction is opposite to the first direction.