Stability comparison of concentric tube bulb manometer with conventional U-shaped manometer

摘要

In continuation of mass flow rate and error analysis comparison, a different comparative performance study is made between concentric tube bulb manometer (CTB) and U-shaped manometer using stability response equations. Basic response equation of transfer function would hold for both the devices since the same underlying principle of force balance existed. Whilst variation in stability response was evaluated in terms of deviation form of differential height for different lengths of same amount of sensing fluid. This included a step change forcing function of 20 kPa at a constant value of gain. On the basis of smaller characteristic time constant it was concluded that CTB is stable and more prompt in response as compared to U-shaped manometer. Response curves for both the manometers were plotted with the help of MATLAB.