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Development of virtual pH analyzer

This paper presents the development of the virtual pH analyzer that can be used for continuous process applications. The development of virtual pH analyzer is divided into two parts: virtual pH measurement and virtual pH control system. The G-programming language potentialities of LabVIEWTM version 2011 running on a Dell Core 2 Duo 2.0GHz, 3GB RAM computer with Windows 7 Ultimate operating system was utilized for data acquisition and control. The pH measurement phase consists of two components namely data acquisition and data display whereas the pH control system phase comprises of data processing and control signal generation components. The front panel has been designed to mimic the actual pH analyzer and the ON/OFF control strategy is applied for pH control system. The accuracy of the developed virtual pH analyzer is tested by comparing the reading from the conventional instrument. The results had shown the improvement in term of the accuracy and flexibility as compared to the conventional pH instruments.