Measurement Linearisation



The relationship between the process measurement, or process variable (PV) and the controller's manipulated variable (MV) can be very non-linear. Controller gain has to be set so that the controller is stable in the region where the PV is most sensitive to changes in the MV, with the result that it is slow to respond over the remainder of the operating range. Modern control systems support a variety of linearisation techniques. This tool enables the engineer to develop a signal conditioning function to apply to both the PV and the set-point (SP), so that the operator interface is unchanged..

Data collected from the process historian are pasted in. The software first displays these data. The user then selects the order of the curve to be fitted. The software determines the coefficients. The conditioned PV is then plotted against the MV to enable the engineer to decide whether the relationship is sufficiently linear.



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