Wednesday, March 6, 2013

Flow Transmitter- Calculation


A flow transmitter is ranged 0 to 350 gallons per minute, 4-20 mA output, direct-responding.
Calculate the current signal value at a flow rate of 204 GPM.
First, we convert the flow value of 204 GPM into a percentage of range. This is a simple matter
of division, since the flow measurement range is zero-based:

Next, we take this percentage value and translate it into a milliamp value using the formula

previously shown:

Therefore, the transmitter should output a PV signal of 13.3 mA at a flow rate of 204 GPM.

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