DEVICE FOR DETERMINING THE FLOW RATE OF A MOVING FLUID

摘要

In a first embodiment of the device described, a heated sensor element is exposed to the moving fluid and is cooled by it. The temperature of the sensor element is controlled so that it remains constant, for instance with respect to the temperature of the fluid. The heating power required to maintain the temperature of the sensor element constant is a measure of the mass of the moving fluid and is used to determine this mass. In a second embodiment, at least one resistor is located above and below the heating element and the mass of the moving fluid determined from the difference in temperature between them. The device includes means for controlling the heater current with evaluation electronics and microcontroller, the evaluation electronics and microcontroller being part of a control device which calculates additional regulation and control parameters as a function of the variable determined for the moving fluid. 00000