All the industrial process applications require solutions of a specific chemical strength of the chemicals or fluids considered for analysis. Such specific concentrations are achieved by mixing a full strength solution with water in the desired proportions. In this paper the control the concentration of one chemical with the help of other has been analyzed. This paper features the influence of different controllers like P, PI, PID and Fuzzy logic controller upon the process model. Model design and simulation are done in MATLAB SIMULINK, using fuzzy logic toolbox. The concentration control is found better controlled with the addition of fuzzy logic controller instead of PID controller solely. The improvement of the process has been observed.

In industrial control systems the liquid level is carrying its significance as the control action for level control in tanks containing different chemicals or mixtures is essential for further control linking set points. The three level control models are considered in our work. In conventional model for three tank liquid level, the control is done with conventional control PID model. The auto tuning technique of PID controller is adopted for more reliable and precise control action which incorporate the uncertain factors also. In this work the comparison of the conventional PID and auto tuning is clarified.

This study reports the biochemical composition of three important edible commercial fish species (1. Liza vaigiensis 2. Rastrelliger kanagurta 3. Scomberoides tol) collected during surveys of fish harbor Dam Sonmiani Balochistan coast in February,2017. The results demonstrate that protein value ranging from 40-52%, lipid 4-6%, carbohydrate 13.3-22%, ash 20-37.5%, moisture 2-6% and water 70.7-73.7%. This study records length, width and weight of each species too. There was positive significant relationship found in between biochemical constituents of all studied fishes.