Which configuration provides sensors for HCN and CO2 in addition to the standard four gases?

• A. QRAE 4-gas
• B. MiniRAE 3000
• C. PID (VOC)
• D. MultiRAE 6-gas

Answer: (D)

In portable gas monitoring, the number and type of sensors determine what hazards you can detect. A baseline four-gas setup covers the common hazards: flammable gas (LEL), oxygen (O2), carbon monoxide (CO), and hydrogen sulfide (H2S). To monitor additional gases, you need a monitor that can be expanded with extra sensors. The six-gas configuration of the MultiRAE adds two more sensors, typically for hydrogen cyanide (HCN) and carbon dioxide (CO2), so you can detect those hazards alongside the standard four. The other options are limited either to exactly four sensors or focus on VOCs rather than inorganic gases, so they can’t reliably provide HCN and CO2 in addition to the standard four.