CONTROL LOOP COMPONENTS DESIRED RESULT -The target condition or set point for the addressed function. -Temperature in a room, duct, pipe, etc. -Humidity level in a room or duct. -Level in a tank. -Air quality level in occupied space. -Open a door when some one approaches. -Etc. CORRECTIVE MEDIUM -A replacement supply of what ever is required to maintain the desired condition of your addressed function. -Hot or cold water, hot or cold air, pressurized air, steam, liquid, refrigerant, etc. LOAD -A varying condition that causes the desired result to be lost by consuming the corrective medium. -Loss or gain of heat, loss or gain of humidity, loss or gain of liquid level in a tank, loss or gain of pressure in a duct, pipe, tank, etc. CONTROLLER -The decision-maker that determines when and how much corrective medium to apply. CONTROLLED DEVICE -The apparatus used by the controller applying the corrective medium to the addressed function. (Valve, damper, etc.) 4.33
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