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Inst Tools > Blog > Practical Questions > Smart DP Transmitter Flow Meter Calculations

Smart DP Transmitter Flow Meter Calculations

Last updated: June 6, 2018 9:51 am
Editorial Staff
Practical Questions
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A Smart DP transmitter with built-in square root characterization is used to measure flow through a pipe.

The orifice plate range is 0 to 125 inches WC at 0 to 277 gallons per minute:

Smart DP transmitter Formula

A technician removes the transmitter from service and tests it by applying several air pressures to the “H” port while leaving the “L” port vented. Here are the As-Found results:

Smart DP transmitter Readings

Calculate the largest error, in percent of (output signal) span.

Also, determine whether this looks like a zero or span error, and whether that error exists in the input (ADC) of the smart transmitter or in the output (DAC).

Answer :

This is a span error in the output (DAC) of the smart transmitter, the greatest error being at the 100% point (20.100 mA instead of 20.000 mA = +0.625%).

More DP Transmitter Questions

Flow Transmitter Readings mismatch with DCS
DP Transmitter Calibration Errors
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