Method and measuring system for determining and/or monitoring an aggregate state change of a measured medium on a thermal, flow measuring device

A method for determining and/or monitoring aggregate state changes on a thermal, flow measuring device of at least a first part of a measured medium, comprising the steps of:

• ascertaining at least one phase boundary line at least of the first part of the medium by means of temperature of the medium being measured, by means of chemical composition of the medium being measured and by means of the partial pressure at least of the first part of the medium being measured and/or by means of the total pressure of the medium being measured;
• providing at least a first measurement signal from a temperature difference between a first temperature sensor and a second temperature sensor of the thermal, flow measuring device and/or from a heating power supplied the medium being measured;
• and
• in the case of a state at least of the first part of the medium being measured in a region of the phase boundary line of the first part of the medium being measured, disturbances of predetermined type in the measurement signal are recognized as aggregate state changes on the thermal flow device at least of the first part of the medium being measured.

The method for the correction of disturbances of a predetermined type in a measurement signal of a thermal, flow measuring device, which disturbances of predetermined type in the measurement signal are recognized as aggregate state changes on the thermal flow device of at least a first part of the medium being measured, comprising the steps of:

• ascertaining at least one phase boundary line at least of the first part of the medium wherein by means of temperature of the medium being measured, by means of chemical composition of the medium being measured and by means of partial pressure at least of the first part of the medium being measured and/or by means of total pressure of the medium being measured;
• providing at least the measurement signal of the thermal, flow measuring device from a temperature difference between a first temperature sensor and a second temperature sensor of the thermal, flow measuring device and/or from a heating power supplied the medium being measured;
• in the case of a state at least of the first part of the medium being measured in the region of the phase boundary line of the first part of the medium being measured, disturbances of predetermined type in the measurement signal are recognized as aggregate state changes on the thermal flow device at least of the first part of the medium being measured;
• and
• smoothing the disturbances in the measurement signal detected as aggregate state changes on the thermal flow device of at least of a first part of the medium being measured.

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

• two temperature sensors;
• and
• a control/evaluation unit, wherein:
• said two temperature sensors are arranged in a region of a housing facing the medium being measured and in thermal contact with medium being measured flowing through the measuring tube;
• a first temperature sensor is heatably embodied;
• a second temperature sensor provides information concerning current temperature of the medium being measured;
• said control/evaluation unit ascertains, on the basis of temperature difference between said two temperature sensors and/or on the basis of heating power supplied said first temperature sensor, mass flow of the medium being measured;
• and
• the thermal, flow measuring device is so embodied, that aggregate state changes on the thermal, flow measuring device of at least a first part of the medium being measured are detectable and/or correctable and/or issuable at the flow measuring device.