The instrument shown in the illustration is...

🔍 Key Concepts

• Note the labels on the illustration such as catalytic bead filament, flash back arrestor screen, and sampling hose leading to a pressure tank. • Think about what kind of test equipment needs a flashback arrestor and charcoal filter when drawing a gas sample from a confined space or tank. • Compare instruments used for atmospheric testing before entry into tanks versus instruments used for exhaust or stack gas analysis.

💭 Think About

• Ask yourself: In which situation would you need to prevent a flame from traveling back into the sampling line using a flashback arrestor? What type of gas would create that risk? • Which of the answer choices is most closely associated with a catalytic bead sensor and an aspirator bulb that pulls a sample from a tank? • Would diesel exhaust or boiler stack gas normally be sampled with a portable, battery-powered device like this, or with fixed/bench-type analyzers?

✅ Before You Answer

• Identify which option involves flammable or explosive mixtures that could ignite, making a flashback arrestor necessary. • Recall what a catalytic bead filament is typically used to detect in gas measurement instruments. • Decide which choice best fits a portable tank-testing meter used in shipboard safety checks before tank entry or hot work.

The instrument shown in the illustration is used to indicate the __________. See illustration SF-0003.

oxygen content of the atmosphere

diesel exhaust analysis by volume

boiler stack gas analysis by weight

concentration of explosive gases in a tank

🔍 Key Concepts

💭 Think About

✅ Before You Answer