Which of the following statements is true...

Question 1 / 2707066636ef028f7522a1c52099d

Question 1 of 2707066636ef028f7522a1c52099d

Which of the following statements is true concerning the meter shown in the illustration? Illustration SF-0003

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Question 1 of 27070

Which of the following statements is true concerning the meter shown in the illustration? Illustration SF-0003

If the question has a related picture, it will appear here.

🔍 Key Concepts

• Combustible gas indicator (explosimeter) operation and purpose • Meaning of meter movement toward the explosive (LEL/UEL) range on the scale • Safe sampling practices when there may be liquid or vapors in a tank

💭 Think About

• Look at each labeled part in the illustration (catalytic bead filament, flash back arrestor screen, charcoal filter, aspirator bulb). How does gas actually move through and get measured? • Think about what a reading at the extreme right side of the scale would represent in terms of gas concentration near the lower explosive limit (LEL) — would that condition ever be called ‘safe’? • If you put the sampling tube directly into liquid, what would that do to the filters and sensors that are designed for vapor, not liquid?

✅ Before You Answer

• Verify which components in the diagram show burning/combustion contained at the sensor versus open burning in the case. • Verify on the scale whether ‘safe’ is associated with low readings, not pegged-high readings at the right edge. • Confirm that the instructions for this type of meter say to avoid drawing liquid into the sampling hose or sensor chamber.

Question 1 of 27070

Which of the following statements is true concerning the meter shown in the illustration? Illustration SF-0003

As gas samples are drawn into the instrument they are burned within the case.

If the meter moves to the extreme right side of the scale and stays there, the atmosphere is safe.

Meter readings are obtained instantaneously upon release of the squeeze bulb.

If there is any liquid in the tank being tested, the sampling tube should be submerged in it to obtain the most accurate reading.

Question 1 / 2707066636ef028f7522a1c52099d

Question 1 of 2707066636ef028f7522a1c52099d

Which of the following statements is true concerning the meter shown in the illustration? Illustration SF-0003

Back

Question 1 of 27070

Which of the following statements is true concerning the meter shown in the illustration? Illustration SF-0003

If the question has a related picture, it will appear here.