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 ($CO_2$), oxygen ($O_2$), and nitrogen oxides ($NO_x$). Sulfur dioxide ($SO_2$) is not one of the standard gases measured by a five - gas analyzer.

Answer:

a. Sulfur dioxide