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JrSentry
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Help: Calculate flow according to output of around 10mA

Sirs, I need someone how to compute flow. Here's the situation: A differential pressure transmitter is calibrated 0 to 100 inches of water and transmits a 4 to 20mA d.c. signal. This transmitter, is placed across an orifice plate which is sized to create 100 inches of water differential at 5 gallons per minute. Calculate the flow rate when the signal is 10mA DC.

Thanks!


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EdBurns
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Re: Help: Calculate flow according to output of around 10mA

10 mA is equivalent to 37.5 inches of water. You ge this by dividing (10-4)/(20-4) and multiplying by 100.

Flow is equal to the square root of the differential pressure across the orifice plate. So take the square root of 37.5 which equals 6.1237 and divide it by the square root of 100 inches of water and you get .61237 Multiply this by 5 gallons per minute (the flow at 100 inches of water) and you get 3.06 gpm.

Note: when you have a signal of 4 mA that is equivalent to zero inches of water and 20 mA equals 100 inches of water.


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