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Outline the purpose and key steps of performing a loop check.

It only verifies that physical wiring exists between sensor and controller.

It verifies instrument calibration and setpoints only.

Confirm continuity and correct wiring, verify tag numbers, signal path from sensor to controller, verify calibration and setpoints, and record results.

Loop checks ensure the entire measurement and control path from sensor to controller is healthy and configured correctly before operation. The goal is to confirm that the physical wiring exists and is connected to the correct points, that there is continuity along the loop, and that the loop is identified properly with matching tag numbers. It also verifies the signal path from the sensor through the transmitter to the controller so the signal is not misrouted or starving. In addition, it checks that calibration and setpoints are correct so the control system responds as intended, and finally it records the results for traceability and future reference. This combination prevents incorrect readings, improper control actions, and unexpected downtime, and provides a documented baseline for ongoing maintenance.

It is only performed after maintenance to reset alarms.

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