Thermal, flow measuring apparatus and method for determining and/or monitoring flow of a medium

A thermal, flow measuring apparatus for determining and/or monitoring flow of a measured medium through a measuring tube, comprising:

• at least two temperature sensors;
• and
• at least one measuring transducer for ascertaining the following properties of the medium:
• thermal conductivity, heat capacity, density and dynamic viscosity or thermal conductivity, thermal diffusivity, density and dynamic viscosity, wherein:
• a first temperature sensor of said at least two temperature sensors is heatable;
• and
• a second temperature sensor of said at least two temperature sensors serves to provide the temperature of the measured medium.

A method for determining and/or monitoring flow of a measured medium through a measuring tube by means of a flow measuring apparatus, comprising:

• at least two temperature sensors;
• and at least one measuring transducer for ascertaining the following properties of the medium:
• thermal conductivity, heat capacity, density and dynamic viscosity or thermal conductivity, thermal diffusivity, density and dynamic viscosity, wherein:
• a first temperature sensor of said at least two temperature sensors is heatable;
• and a second temperature sensor of said at least two temperature sensors serves to provide the temperature of the measured medium, the method comprising a step as follows:
• ascertaining respective values of the following properties of the medium:
• thermal conductivity, heat capacity, density and dynamic viscosity or thermal conductivity, thermal diffusivity, density and dynamic viscosity.

The use of a thermal, flow measuring apparatus comprising:

• at least two temperature sensors;
• and at least one measuring transducer for ascertaining the following properties of the medium:
• thermal conductivity, heat capacity, density and dynamic viscosity or thermal conductivity, thermal diffusivity, density and dynamic viscosity, wherein:
• a first temperature sensor of said at least two temperature sensors is heatable;
• and a second temperature sensor of said at least two temperature sensors serves to provide the temperature of the measured medium,
• the use ascertaining the flow velocity of a measured medium having time variable composition and/or for detecting a change in the medium during measurement operation of the thermal, flow measuring apparatus.