During calibration gas exposure, readings are adjusted to the certified gas concentration during which calibration?

• A. Zero Calibration
• B. Full Calibration
• C. Full / Span Calibration
• D. Span Calibration

Answer: (C)

Calibration relies on matching the sensor’s readings to known reference values. Zero calibration is about setting the baseline using a gas with effectively zero concentration, so it doesn’t bring the reading to a certified concentration. Span calibration, using a calibration gas of known concentration, adjusts the sensor’s response to that specific value but doesn’t restart the baseline. The full process, often labeled Full / Span Calibration, combines both steps and includes exposing the sensor to calibration gas to adjust its readings to the certified concentration, ensuring accuracy across the entire range.