Wheatstone the flow

Sheble, Nicholas; Pandey, Amit Kumar
March 2005
InTech;Mar2005, Vol. 52 Issue 3, p55
This article focuses on the design of a sensor that measures low flow rate. Many times in industrial applications, measurement of very low flow rates is required with fair accuracy. Fluids like natural gas, petroleum and oxygen flow to customers on a continuous basis through dedicated pipelines. Precise online measurement of quantum of supply is essential for payment purposes. The sensor uses the important properties of the thermosistor and is cost effective. A thermal anemometer measures fluid velocity by sensing changes in heat transfer from a small, electrically heated sensor exposed to the fluid. The heated sensor holds at a constant temperature using an electronic control circuit. Increasing the current flow to the sensor compensates for the cooling effect resulting from the fluid flowing past the sensor. The magnitude of the current increase needed to keep the temperature constant relates directly to heat transfer and the flow velocity. This parameter is available as an output voltage.


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