How often must you calibrate the BAR-97 EIS?

• A. Every 72 hours or when prompted.
• B. Daily.
• C. Weekly.
• D. Monthly.

Answer: (A)

Regular calibration keeps the analyzer’s readings accurate because its sensors drift over time due to aging, temperature, and usage. The BAR-97 EIS is set to require calibration every 72 hours, and it will also prompt you to calibrate whenever the instrument determines calibration is needed. Calibrating on schedule plus following prompts ensures emissions results stay within required tolerances; skipping calibration or delaying it can lead to inaccurate readings and potential issues with the test results. Daily, weekly, or monthly schedules aren’t aligned with how quickly sensor drift can occur in practice, whereas the 72-hour interval plus prompts matches the instrument’s built‑in checks.