Electronic square root error indicator

Claim 1

An improved square root error indicator apparatus comprising: (a) a differential pressure transducer means for producing analog signals representative of differential pressures of fluid flowing through a closed medium orifice; (b) an analog to digital converter means operatively connected to the differential pressure transducer means for converting the analog signals to digital signals; and (c) a digital computing means responsive to the digital signals for producing square root error signals, said digital computing means including a data processing means and an instruction means, said processing means responsive to instructions of the instruction means for: producing signals representative of the square roots of the differential pressure signals; accumulating the differential pressure values and the square root values of the digitized signals for a preselected time; averaging the accumulated differential pressure values and the corresponding square root values thereof; determining the square root value of the average differential pressure; determining the difference between the square root of the average differential pressure and the average of square roots of the differential pressures; and dividing the difference by the average of the square roots of the differential pressures whereby the square root error is produced.