Other

Jurgen Willner

Manfred Wenzel

Kurt Steilen

The invention relates to a process for calibrating a calorimetric flow indicator to a medium to be measured. The flow indicator has a sensor element that provides a temperature-dependent resistance and which heat up in a short period of time by means of electrical current heat. The resistance variation of the sensor element represents a measure of the flow velocity of a medium flowing by the sensor element. The calorimetric flow indicator is set for a specified medium other than the medium to be measured, with a resistance value Ro at a zero flow and a resistance value R.sub.max at a maximum flow, defining a preset range of measurement R.sub.max --Ro for the specified medium. To calibrate for the medium to be measured, a resistance value Rx of the sensor element at a zero flow of the medium to be measured is measured, the resistance value Ry of the sensor element at a maximum operating flow of the medium to be measured is measured, and a measuring range Ry--Rx, defined by the resistance values Rx and Ry, is automatically brought into coincidence with the preset measuring range R.sub.max --Ro by displacing and extending the measuring range in relation to the preset range.

Process for calibrating a calorimetric flow indicator

A calorimetric flow indicator includes a sensor element which forms a temperature-dependent resistance and which heats up in a short period of time by application thereto of electrical current. A resistance variation of the sensor element, induced by cooling, represents a measure of flow velocity of a medium flowing by the sensor element. The sensor element rests against an inner surface of a front wall of a housing projecting into the flowing medium. That section of the housing that includes the front wall and projects into the flowing medium has the shape of an obtusely truncated cone.

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Schwalbach, Germany

Jurgen Willner