Which statement about sensor calibration frequency is true?

• A. Calibrate only when readings seem off.
• B. Calibrate in-house and ignore manufacturer guidance.
• C. Calibration should be performed according to manufacturer recommendations and internal policy.
• D. Calibration should be done daily regardless.

Answer: (C)

Calibration frequency is determined by a blend of what the sensor’s manufacturer recommends and what your organization’s policy requires. Manufacturer guidance reflects how the device behaves in normal conditions, including how often drift is expected and what setup or standards are needed for a valid calibration. Internal policy adds a layer of consistency, risk management, and regulatory or QA requirements across facilities, ensuring everyone follows the same, auditable schedule.

This combination is the best approach because it keeps measurements trustworthy without overdoing calibrations. Following manufacturer recommendations helps you calibrate at intervals proven to maintain accuracy for that specific sensor and procedure, while internal policy ensures those intervals are applied consistently, documented, and aligned with broader safety and quality goals.

Calibrating only when readings seem off is risky because drift can be gradual and not immediately obvious; by the time you notice a discrepancy, data quality may already be compromised. Ignoring manufacturer guidance and calibrating in-house without it can break traceability and leave you without validated procedures. Calibrating daily for every sensor is usually unnecessary and impractical; the right frequency depends on device characteristics, process criticality, and risk assessment, not a one-size-fits-all rule.