Cough Reflex Test (CRT) Practice 2026 – Comprehensive All-in-One Resource for Exam Success!

The appropriate reading for a helium analyzer when calibrating with air is 0%. Helium analyzers are designed to measure the concentration of helium in a sample. Since air contains only trace amounts of helium (approximately 0.0005%), using air for calibration would result in the analyzer detecting a helium concentration of effectively zero. This establishes a baseline that ensures the analyzer can accurately measure increases in helium concentration when it is present in greater amounts.

In contrast, readings such as 100%, 50%, or 25% imply the presence of helium at significant levels, which is not applicable when calibrating with air. This understanding is crucial for technicians and operators to ensure accurate measurement capabilities of helium in various applications.