If the LEL for methyl ethyl ketone is 1.4, what is the true LEL percentage when the CGI reads 2%?

To determine the true Lower Explosive Limit (LEL) percentage for methyl ethyl ketone (MEK), it is essential to understand how the LEL is expressed in relation to the concentration of a flammable vapor in air. The specified LEL of 1.4 for MEK indicates that a mixture must contain at least 1.4% of MEK in air to reach the threshold of flammability.

When the LEL is referenced, it is typically expressed as a percentage of the volume of the gas or vapor in the air. If the calibrated gas indicator (CGI) shows a reading of 2%, it is indicating the current concentration of MEK in the air.

In this context, the ratio of the CGI reading to the LEL can be calculated to determine the percentage of LEL that the current concentration represents:

1. Calculate the ratio:

• Take the CGI reading (2%) and compare it to the LEL (1.4%).

• This means: (2% / 1.4%) * 100 = 142.86%.

This percentage indicates that the current concentration (2%) is approximately 142.86% of the LEL.

To express this in