| 摘要 |
<p>A flow-sensing system is provided which employs a pair of sensing resistors (b and b*). One of the resistors (b) is disposed within flowing fluid (10), while the other (b*) is shielded from the flow. The sensor resistances are held constant by identical feedback circuits (NP and IV*P*) which maintain the relationship between current values in the sensors (b and b*) for this purpose. The required difference in currents in the two resistors enables fluid flow to be computed. Input and output temperature sensors (13 and 15) are provided to enable temperature difference to be measured and combined with fluid flow to indicate the rates of BTU flow. One temperature sensor (15) and the fluid-flow sensors constitute an assembly (14) miniaturized in a solid state chip.</p> |
