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Measurement, indirect, in the bypass flow

Sketch of a bypass sensor block

In this case, the measurement is taken using the bypass principle. A laminar flow element in the main channel generates a slight pressure drop, which drives a small proportion of the full flow through the actual sensor tube. Two heating resistors are wound on thin stainless steel tubes and are interconnected to form a measurement bridge. When the medium passes through the tube, heat is transported in the direction of the flow and this misaligns the previously balanced bridge.