What are the three common sensors found in a multigas meter?

The correct answer identifies three essential sensors that are commonly found in a multigas meter: oxygen, hydrogen sulfide, and lower explosive limit sensors. Each of these sensors plays a crucial role in assessing the safety of an environment, especially in areas where combustible gases might be present or where toxic gases could pose a hazard.

Oxygen sensors are vital for determining whether the atmospheric oxygen level is within a safe range, typically between 19.5% and 23.5%. Levels below this range can lead to oxygen deficiency, which can be life-threatening.

Hydrogen sulfide sensors detect one of the most dangerous gases encountered in confined spaces and various industrial applications. Hydrogen sulfide is toxic and can cause immediate health effects and potential fatalities even at low concentrations.

Lower explosive limit (LEL) sensors measure the concentration of flammable gases and vapors in the air. They are critical for assessing the risk of fire or explosion in environments where combustible materials may be present.

The other answer choices include sensors that are not typically found together in a single multigas meter or include elements that do not accurately reflect the most common types. Thus, the combination of oxygen, hydrogen sulfide, and lower explosive limit sensors represents the standard setup found in such safety instruments.