Which instrument is used specifically for detecting acetylene?

• A. Flame ionization detector
• B. Explosimeter
• C. Combustible gas indicator
• D. Infrared gas analyzer

Answer: (B)

The instrument used specifically for detecting acetylene is the explosimeter. An explosimeter is designed to measure the concentration of combustible gases, including acetylene, in the air to assess potential explosion risks. It works based on the principle of gas combustion, allowing it to provide direct measurements of explosive levels.

Acetylene is particularly notable for being highly flammable and requires careful monitoring in environments where it is present to prevent hazards. The explosimeter's sensitivity to low concentrations makes it ideal for detecting such gases before they reach dangerous levels.

While other instruments listed have their applications, they may not be primarily focused on acetylene detection. For example, a flame ionization detector is typically used for measuring volatile organic compounds, and while a combustible gas indicator can give a general sense of combustible gas concentration, it does not specifically target acetylene. The infrared gas analyzer is more suited for measuring specific gas concentrations based on absorption characteristics but is generally not the first choice for a gas like acetylene, which is more easily monitored with an explosimeter.