Ratio control system


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We have to develop a ratio control between a fuel supply controller & an air flow controller to the furnace.
both of this air inlet & fuel supply is given to the furnace for combustion.
a feed back is taken from furnace temp controller & given to the fuel flow controller.
Give some idea regarding the ration of fuel to air to be maintained & the type of instrumentation to be applied.
we will be using yokogawa controllers UT-370.

we can follow shinskey method also ,but how to apply it practically, is a problem.

waiting for ur response.
yogesh gupta