Combustible gas indicators require which oxygen level?

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Multiple Choice

Combustible gas indicators require which oxygen level?

Explanation:
The function of combustible gas indicators relies on the presence of oxygen in the surrounding air to oxidize the detected flammable gas on the sensor. These devices are calibrated for normal atmospheric conditions, which means an oxygen level around 21% (the same as standard air). When oxygen is significantly lower, the sensor chemistry doesn’t react as expected, and readings become unreliable or the instrument may not operate properly. So, the measurement is meaningful and accurate when the environment has about 21% oxygen.

The function of combustible gas indicators relies on the presence of oxygen in the surrounding air to oxidize the detected flammable gas on the sensor. These devices are calibrated for normal atmospheric conditions, which means an oxygen level around 21% (the same as standard air). When oxygen is significantly lower, the sensor chemistry doesn’t react as expected, and readings become unreliable or the instrument may not operate properly. So, the measurement is meaningful and accurate when the environment has about 21% oxygen.

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