RADIOMETRIC MICROELECTRONIC TRANSDUCER GAS CONSUMPTION WITH FREQUENCY OUTPUT
The article describes the characteristics of radio measuring gas flow transducer with frequency output as a self-oscillator circuit with a flow sensing element based on a bipolar transistor. Based on the energy balance in flow sensing element obtained transfer function, which is calculated on the basis of sensitivity. The highest sensitivity of the device is in the range of 0,5 l / h to 1,0 l / h and ranges from 1,4 to 1,5 kHz / l / h. Shows a schematic view of the heat transfer processes in flow sensing element. On the basis of the equivalent circuit autogenerating bipolar transistor structure using Kirchhoff equation system defined by current-voltage characteristic dependence of oscillation frequency of the voltage source action management, conversion function.