The reading of a combustible gas indicator...

Question 1 / 270705eccef9ebacbc34ba4d465ad

Question 1 of 270705eccef9ebacbc34ba4d465ad

The reading of a combustible gas indicator indicates the percentage of the __________.

Question 1 of 27070

The reading of a combustible gas indicator indicates the percentage of the __________.

🔍 Key Concepts

• Lower Explosive Limit (LEL) vs Upper Explosive Limit (UEL) • What a combustible gas indicator (CGI) is actually calibrated to measure • Difference between actual gas concentration in air and limits of flammability

💭 Think About

• Is the instrument telling you how much gas is present, or how close that atmosphere is to becoming flammable/explosive? • Think about what value a safety watchstander really needs to know before allowing hot work or entry into a space. • How are readings usually expressed on a CGI scale: as % of what reference point?

✅ Before You Answer

• Check which choices talk about a limit (a boundary where gas becomes dangerous) vs the actual gas concentration. • Recall that CGI readings are often shown as % of LEL, not as % gas-by-volume directly. • Eliminate any options that refer to upper explosive limit or to gases that are specifically nonflammable.

Question 1 of 27070

The reading of a combustible gas indicator indicates the percentage of the __________.

Lower explosive limit of a flammable gas concentration

Concentration by weight of nonflammable gas in a compartment

Concentration of flammable gas in a compartment

Upper explosive limit of a flammable gas concentration

Question 1 / 270705eccef9ebacbc34ba4d465ad

Question 1 of 270705eccef9ebacbc34ba4d465ad

The reading of a combustible gas indicator indicates the percentage of the __________.

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Question 1 of 27070

The reading of a combustible gas indicator indicates the percentage of the __________.