Question 726Deck Safety70% to pass
Combustible gas indicators measure the presence of combustible gas as a percentage of the _______________.
AI Explanation
The correct answer is C) lower explosive limit.
Combustible gas indicators measure the presence of combustible gas as a percentage of the lower explosive limit (LEL). The LEL is the minimum concentration of a gas or vapor in air below which the mixture will not ignite or explode. Combustible gas indicators are designed to detect the presence of flammable gases and provide a reading as a percentage of the LEL, allowing operators to monitor and prevent potentially hazardous conditions.
The other options are incorrect because the fire point and flash point are characteristics of a liquid fuel, not a measurement of gas concentration, and the upper explosive limit (UEL) is the maximum concentration of a gas or vapor in air above which the mixture will not ignite or explode.
Related Questions
#724 You are testing a tank that contained gasoline by using a combustible gas indicator. Under testing, the tank sample caused the needle to move rapidly to 100 on the dial then fall to zero. What is the concentration of flammable gas? #725 A combustible gas indicator meter is calibrated to read the percentage of _______________.#727 When using the combustible gas indicator, a special filter for filtering the incoming sample must be used if the atmosphere being tested contains vapors of _______________.#728 A pump room is suspected of accumulating gases after a ventilation machinery breakdown. Where should the combustible gas indicator case be placed when testing the pump room atmosphere for combustible gases? #729 Which instrument is suitable for determining the presence of explosive concentrations of fuel oil vapors in tanks?