Multi-gas instruments are widely used and are usually capable of housing four different sensors. A typical configuration would comprise sensors for measuring: identify one that will be of major importance for enclosed space entry,

A. Hydrocarbon vapor as a % LFL (explosimeter function using a pellistor sensor).
B. Hydrocarbon vapor in inert gas as a % Volume (tankscope function using an infra-red sensor).
C. Oxygen (using an electrochemical sensor).
D. Hydrogen Sulfide (using an electrochemical sensor).

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