Thermal measuring and testing – Calorimetry – Gain or loss of heat by heat utilizing load in path of heat...
Patent
1986-12-29
1988-10-25
Goldstein, Herbert
Thermal measuring and testing
Calorimetry
Gain or loss of heat by heat utilizing load in path of heat...
7320419, G01F 168
Patent
active
047794585
ABSTRACT:
A flow-sensing system is provided which employs a pair of sensing resistors. One of the resistors is disposed within flowing fluid, while the other is shielded from the flow. The sensor resistances are held constant by identical feedback circuits which maintain the relationship between current values in the sensors for this purpose. The required difference in currents in the two resistors enables fluid flow to be computed.
Input and output temperature sensors are provided to enable temperature difference to be measured and combined with fluid-flow to indicate the rates of BTU flow. One temperature sensor and the fluid-flow sensors constitute an assembly miniaturized in a solid state chip.
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Goldstein Herbert
Schramm Frederic B.
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