Measuring and testing – Volume or rate of flow – Thermal type
Reexamination Certificate
2008-03-04
2008-03-04
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
Thermal type
C073S204150
Reexamination Certificate
active
11352212
ABSTRACT:
A low-cost thermal flow meter that has good temperature characteristics and little variations. The thermal flow meter includes a sensor element including a heat-generating resistor and at least two temperature-measuring resistors disposed downstream and upstream. The sensor element is positioned in the flow of a measured medium. It also includes an adjusting means for adjusting a excess temperature (ΔTh=Th−Ta) of the heat-generating resistor, which is the difference between the temperature (Ta) of the measured medium and the temperature (Th) of the heat-generating resistor. The adjusting means adjusts the excess temperature (ΔTh) of the heat-generating resistor depending on the temperature of the measured medium such that the excess temperature becomes smaller as the temperature of the measured medium increases.
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Matsumoto Masahiro
Nakada Keiichi
Nakano Hiroshi
Watanabe Izumi
Yamada Masamichi
Hitachi , Ltd.
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Patel Harshad
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