Explain how process instruments are illustrated on a drawing.
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Circles or bubbles are used to indicate an instrument. The information inside the circle identifies the instrument, what it does, and the variable being measured. A line drawn horizontally through the circle indicates that it is remote located. This typically indicates that the device is located in a control room. A dashed line indicates that the instrument is located in a control room, behind the control panel. Occasionally numbers are located in the circle that may indicate the number of the control loop. This could indicate which system the device is in, or any variety of special applications used by the company. There are a large variety of instruments and instrument symbols used in the chemical processing industry. The variables that instruments measure are; pressure, temperature, level, flow, and analytical variables.
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