What is a varying operational condition that is associated with a processing operation such as temperature, pressure, flow rate, level, and composition?
A) Remote
B) Process variable
C) Analytical variable
D) Transducer
Answer: B
Explanation: A) Incorrect. A remote is instrumentation that is located away from the process (e.g., in a control room) and is controlled by the DCS or other panel board mounted controller.
B) Correct. A process variable is a varying operational condition that is associated with a processing operation such as temperature, pressure, flow rate, level, and composition.
C) Incorrect. An analytical variable is a measurement of the chemical or physical properties of a substance.
D) Incorrect. A transducer is the control loop component that converts one instrumentation signal type to another type (e.g., electronic to pneumatic).
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