The N2 cautionary range upper bound

The N2 cautionary range upper bound

• A. 101%
• B. 103%
• C. 101-105%
• D. 95-101%

Answer: (D)

Think of the N2 cautionary range as a safety tolerance around the target nitrogen content. Since the goal is essentially pure nitrogen, you keep a band that accounts for measurement variability and instrument drift. That band is centered near 100% nitrogen, with a bit of leeway both below and above to avoid false alarms. The chosen range spans from 95% up to 101%. The upper limit being 101% reflects allowing a small over-read due to calibration or reading tolerance, while the lower limit of 95% provides a margin on the low side. This combination gives a practical, symmetric-ish tolerance around the ideal value. Other options don’t fit this idea: a single value or a range that starts well above 100% misses readings near the target, and a range like 101-105% is biased too high and would ignore acceptable lower readings.

Think of the N2 cautionary range as a safety tolerance around the target nitrogen content. Since the goal is essentially pure nitrogen, you keep a band that accounts for measurement variability and instrument drift. That band is centered near 100% nitrogen, with a bit of leeway both below and above to avoid false alarms.

The chosen range spans from 95% up to 101%. The upper limit being 101% reflects allowing a small over-read due to calibration or reading tolerance, while the lower limit of 95% provides a margin on the low side. This combination gives a practical, symmetric-ish tolerance around the ideal value.

Other options don’t fit this idea: a single value or a range that starts well above 100% misses readings near the target, and a range like 101-105% is biased too high and would ignore acceptable lower readings.