N2 cautionary range is

N2 cautionary range is

• A. 95%
• B. 95-101%
• C. 101-103%
• D. 103% max

Answer: (B)

The idea is to keep the nitrogen content within a small window around pure nitrogen so the system stays inert while allowing for normal measurement variation. A cautionary range of 95% to 101% provides a lower bound that prevents too much oxygen from slipping in, and an upper bound that accounts for slight over-readings or calibration drift. In practice, you want the nitrogen concentration to stay well above any level where oxygen could compromise the inerting, but you also acknowledge that instruments aren’t perfect, so a tiny over-read is acceptable. The other options either miss the full safe band or imply unrealistic bounds, so they don’t fit as well.

The idea is to keep the nitrogen content within a small window around pure nitrogen so the system stays inert while allowing for normal measurement variation. A cautionary range of 95% to 101% provides a lower bound that prevents too much oxygen from slipping in, and an upper bound that accounts for slight over-readings or calibration drift. In practice, you want the nitrogen concentration to stay well above any level where oxygen could compromise the inerting, but you also acknowledge that instruments aren’t perfect, so a tiny over-read is acceptable. The other options either miss the full safe band or imply unrealistic bounds, so they don’t fit as well.