MATLAB Simulation Processes on Pneumatic Force-Balance Transmitter

Abstract

A pneumatic force balance transmitter in which an input force proportional to the fluid flow rate being measured is applied to a force bar pivoted about a transverse axis to produce a torque. A rebalance torque is applied to the bar by means of a negative feedback loop, in which a pneumatic detector functions to sense any change in bar position, the detector output being amplified to produce a pneumatic output signal that is fed to a bellows assembly to impose a feedback force on the bar in opposition to the input force to an extent tending to hold the bar motionless. The bellows assembly is constituted by a small bellows nested within a larger bellows whereby the feedback force developed by the assembly may be selectively changed in large steps by feeding the output signal either to the small or the large bellows or to both, thereby to effect a coarse change in the operating range of the instrument. The effect of the force-balance transmitter on the characteristics of the pressure was monitored, predicted and simulated using the MATLAB program approach.

Keywords: MATLAB, simulation, processes, pneumatic, force-balance, transmitter