What is setpoint creep and how can it be prevented?

What is setpoint creep and how can it be prevented?

• A. A sudden jump in setpoint caused by power fluctuations; prevent with surge protection.
• B. Gradual drift of a setpoint due to sensor aging or poor calibration; prevent with periodic recalibration and maintenance.
• C. A deliberate policy to gradually raise setpoints to save energy; prevent with strict locking.
• D. An issue caused by using too many sensors; prevent by removing redundant sensors.

Answer: (B)

Setpoint creep is the gradual drift of the control setpoint over time as sensors age or drift from their original calibration. As sensors lose accuracy, the controller’s reading of the environment becomes less true, so the system ends up maintaining temperatures that are higher or lower than the intended target without any sudden change in the control logic. Prevention comes from periodic recalibration and maintenance of sensors: verify accuracy against a known reference, adjust calibration offsets as needed, replace aging sensors, and keep calibration records. Using higher-quality or more stable sensors and performing routine maintenance helps catch drift early. This isn’t about sudden power-related jumps, which would be a different issue, nor is it about an intentional policy to raise setpoints or about having too many sensors.

Setpoint creep is the gradual drift of the control setpoint over time as sensors age or drift from their original calibration. As sensors lose accuracy, the controller’s reading of the environment becomes less true, so the system ends up maintaining temperatures that are higher or lower than the intended target without any sudden change in the control logic.

Prevention comes from periodic recalibration and maintenance of sensors: verify accuracy against a known reference, adjust calibration offsets as needed, replace aging sensors, and keep calibration records. Using higher-quality or more stable sensors and performing routine maintenance helps catch drift early.

This isn’t about sudden power-related jumps, which would be a different issue, nor is it about an intentional policy to raise setpoints or about having too many sensors.