Thermosensitive flow meter

摘要

The meter has a first thermosensitive resistor (Rh) located in a fluid duct (19), to measure flow speed and a second thermosensitive resistor (Rk), to measure air temperature. The resistor temperatures are raised to preset temperatures by controlling their currents. The current through the second resistor is lower than that for the first. The potential difference across the first resistor is used as a reference. The resistors have a common connection to the first control circuit.