ELECTRONIC SQUARE ROOT ERROR INDICATOR

An apparatus for determining a square root averaging error for a dirferential pressure orifice meter while measuring volumetric fluid flow in a closed medium including input circuitry (12, 14) that provides an input signal corresponding to the instantaneous differential pressure measured at the orifice plate and logic circuitry (21) connected to receive the signals from the input circuitry for computing the square root averaging error for the orifice meter over a selected time interval. Also disclosed in an apparatus for measuring volumetric fluid flow in a closed medium that includes input circuitry (12, 14) for providing an input signal corresponding to a differential pressure at an orifice located within the closed medium and logic circuitry (21) connected to receive the input signal, compute a square root of the corresponding differential pressure and provide an output signal corresponding to this square root.