what is the purpose of loop drawings
Loop Diagram usually shows a single control loop which means it could only contains just one input (sensor to control system), just one output (control system to final element) or combination of both.Reference drawing.o have the loop diagram completed and provide complete information, the following are list of data required along with its source/reference: 1  Instrument Terminal number. 2  Most instrument could be assumed to use (+) and 3  (-). Terminals.