Thermal Flowmeter

摘要

A flowmeter of the thermal type, having a heated flow-sensing probe and a temperature-sensing reference probe, in which the flow is passed through nozzles to form two jets and those jets are directed at the heated portion of the heated probe and the temperature-sensing portion of the reference probe, while flow around the supporting portion of the heated probe is minimized. Such a flowmeter allows low gas flows to be measured without the use of capillary elements that are subject to plugging and can create unwanted pressure drops.

主权项

1. A flowmeter of the thermal type, where the flowmeter is adapted to have fluid passed through it, the flowmeter comprising:
a heated probe with a heated portion; a reference probe with a temperature-sensing portion; and structure that forms the fluid passing through the flowmeter into two jets, wherein one jet is directed at the heated portion of the heated probe and the other jet is directed at the temperature-sensing portion of the reference probe.