Flow sensor's null-point calibration and flow direction detection method, involves measuring electrical power consumption, where measuring signal of electrical power consumption is reached to minimum or maximum

摘要

The method involves varying volume flow continuously from a flow direction to another flow direction by a flow sensor. Total electrical power consumption of electrical resistors (1) or an electrical heater is measured. A measuring signal of the electrical power consumption is reached to a minimum or maximum such that the measuring signal or a simultaneously detected current or voltage signal is stored and is utilized as a signal for operation. The current or voltage signal is changed with resistance change of the resistors or heater.