The level he perceives to be the desired level, might not be the same as instructed.The problem exists that there are multiple forms of human error that may occur, like: After some experience, he may realize that the valve must be open to a certain point to maintain the desired level, with a constant outflow. When the tank level decreases below the desired level, he will increase the inflow by opening the valve and when the tank level increases to more than the desired level, he will close the valve. The means he has to his disposal to carry out this task is by opening and closing this valve.
The instruction was given to him to maintain a desired water level in the tank. An operator visually monitors the level in the tank. This is an example of Manual Level control.
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