| 摘要 |
The description relates to a device for finding the flow rate of a flowing medium in which a heating element (RH) heats at least one upstream and downstream temperature-dependent resistor (RAU1, RAU2, RAB1, RAB2), where the resistors which are cooled to different degrees by the flowing medium are connected in a bridge, the diagonal voltage of which depends on the temperature difference between the resistors. The mass of the flowing medium is finally found from this prepared voltage (UM). The temperature of the resistor is controlled with the aid of its own heat control circuit (HK) which regulates the current through the heating element (RH) in such a way that the temperature of the heating element is a predeterminable function of the temperature of the flowing medium. A temperature balancing operation is performed using a high-temperature balancing stage (HTA) and a converter circuit (UMS), with the aid of which the measuring voltage (UM) is compensated at high temperatures. |
