Signal Analysis, Theory and the Real World

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Measuring principle Sensyflow operates according to the same principle as the hot-film anemometer. This method of measurement is based on the abstraction of heat from a heated solid by way of an enveloping gas flow. The flow-dependent ''cooling'' impact is used as the measuring impact.

The gas stream flows past two temperature-sensitive resistors RS and RT, which are part of an electrical bridge circuit. Due to the chosen resistance ratio

RS << RT ,

RS is heated by the current IS, and RT adopts the same temperature as the gas. The current IS is preset by the electronic control circuit to produce a constant temperature difference between the heated resistor RS and the temperature of the gas. The electrical power generated within resistor RS exactly compensates its loss of heat to the gas flow. As this loss of heat is dependent on the number of particles which collide with the surface of resistor RS, then IS represents a measure of mass flow rate.

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