A combustible gas meter with four sensors was used to evaluate a confined space

Question

A combustible gas meter with four sensors was used to evaluate a confined space entry. The measurements for those four sensors are shown below. What is the most appropriate action based upon these readings? Oxygen = 20% Carbon monoxide = 45 ppm %LEL = 5% Hydrogen sulfide = 10 ppm a. OK to enter if worker has a half mask air purifying respirator with cartridges for hydrogen sulfide b. Entry into this space should not be permitted C. OK to enter the space without any respiratory protection d. OK to enter but worker must have an air supplied respirator e. OK to enter if worker has a single use respirator that is approved for dust, mist and fume

Explanation / Answer

For a four gas combustible meter, There are different acepted levels for oxgen, carbon monoxide, Hydrogen sulphide and LEL (Lower Explosive Limit)

The lower limit for oxygen is 19.5% and upper limit is 23.5%. As our sensor detected 20%, it is okay to enter in terms of oxygen levels.

The LEL should be around 10%.

The Carbon monoxide becomes fatal after 100 ppm. 45 ppm is acceptable.

The hydrogen sulphide's acceptable level is 10 ppm and we detected the same.

Looking at four readings, It is okay to enter the space.

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