Measuring and testing – Volume or rate of flow – Thermal type
Patent
1979-08-06
1981-11-10
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
73116, G01F 168
Patent
active
042991242
ABSTRACT:
A temperature-dependent resistor or hot wire is extended over at least three anchoring points and to improve the measuring accuracy of the hot wire and to ensure sufficiently high temperatures over the entire active length of the hot wire during a cleaning step by burning, the hot wire is configured in the shape of loops at all anchoring points and the intersecting wire sections of the loops are conductively connected with one another. Current lead wires are preferably conductively attached to the hot wire by means of which the current is conducted to an electric control device. The end anchoring points are preferably electrically heated during an interruption of the measuring process of the hot wire and the hot wire may be directed in a W-shape over anchoring points whereat the hot wire is connected to the electric current, during the measuring process, via the two central, symmetrical anchoring points and upon an interruption of the measuring process, by means of a switching device, via the two end anchoring points.
REFERENCES:
patent: 1156630 (1915-10-01), Savage
patent: 1260498 (1918-03-01), Wilson
patent: 3971247 (1976-07-01), Rodder
patent: 4074566 (1978-02-01), Obayashi
patent: 4196622 (1980-04-01), Peter
Hafner Udo
Kammerer Werner
Knapp Heinrich
Romann Peter
Sauer Rudolf
Goldstein Herbert
Greigg Edwin E.
Robert & Bosch GmbH
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