In a control loop, which component is primarily responsible for measuring the process variable?

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Prepare for the NRCC Instrumentation Test. Study with flashcards and multiple-choice questions, each complemented with hints and explanations. Gear up for your exam success!

Multiple Choice

In a control loop, which component is primarily responsible for measuring the process variable?

Explanation:
The sensor is the part that directly measures the process variable. It interacts with the process (such as a temperature sensor, pressure sensor, or level sensor) and converts that physical quantity into a signal that represents the actual measurement. A transmitter may follow to condition and send that signal to the controller, but the measurement itself originates in the sensor. The final control element acts on the controller’s signal to affect the process, while the indicator merely displays the measurement for humans. So, the device that directly measures the process variable is the sensor.

The sensor is the part that directly measures the process variable. It interacts with the process (such as a temperature sensor, pressure sensor, or level sensor) and converts that physical quantity into a signal that represents the actual measurement. A transmitter may follow to condition and send that signal to the controller, but the measurement itself originates in the sensor. The final control element acts on the controller’s signal to affect the process, while the indicator merely displays the measurement for humans. So, the device that directly measures the process variable is the sensor.

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