Using a simple control loop system within a pilot plant, change a variable (e.g., tank level). Record the mA meter signal, then the controller output, then the air signal from the trans ducer, and record how the valve moves. Record the readings at several different milliamp and air points between 0 and 100%, 4 to 20 milliamps, and 3 to 20 psig on the air signal. If pilot equipment is not available, use graphics for each of the changes. Calculate the milliamp and air pressure values based on the relationship between the two and determine the expected valve movements and positions.
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