pressure and flow measurment

alinezmzd's picture

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Joined: May 31, 2020

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pressure and flow measurment
August 14, 2020 - 3:57pm

Good morning, I have a question about the operation of the following circuits where the same type of sensor is used but the first circuit measures pressure and the second measures flow.

Sourav Gupta's picture

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Could you share the information about the sensor?

alinezmzd's picture

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The sensor is a strain gauge who works as a DC Wheatstone bridge  where the voltage varies when strain varies

marry roser's picture

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A Pitot-tube is used to measure fluid flow velocity. The tube is pointed into the flow and the difference between the stagnation pressure at the tip of the probe and the static pressure at its side is measured, yielding the dynamic pressure from which the fluid velocity is calculated using Bernoulli's equation.
A variable area meter measures fluid flow by allowing the cross sectional area of the device to vary in response to the flow, causing some measurable effect that indicates the rate. A rotameter is an example of a variable area meter, where a weighted "float" rises in a tapered tube as the flow rate increases; the float stops rising when area between float and tube is large enough that the weight of the float is balanced by the drag of fluid flow.

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A Pitot-tube is used to measure fluid flow velocity. The tube is pointed into the flow and the difference between the stagnation pressure at the tip of the probe and the static pressure at its side is measured, yielding the dynamic pressure from which the fluid velocity is calculated using Bernoulli's equation.
Flow measurement methods other than positive-displacement flowmeters rely on forces produced by the flowing stream as it overcomes a known constriction, to indirectly calculate flow. Flow may be measured by measuring the velocity of fluid over a known area. For very large flows, tracer methods may be used to deduce the flow rate from the change in concentration of a dye or radioisotope.