Question

which of the following is not a measured gas when using a five gas analyzer?
a. sulfur dioxide
b. hydrocarbons
c. carbon monoxide
d. oxygen

Explanation:

A five - gas analyzer typically measures hydrocarbons (HC), carbon monoxide (CO), carbon dioxide (CO₂), oxygen (O₂), and nitrogen oxides (NOₓ). Sulfur dioxide (SO₂) is not one of the gases measured by a standard five - gas analyzer.

Answer:

A. Sulfur dioxide