The wide range includes models with different gas types (flammable, toxic, explosive, etc.) and use (civil and industrial). There are conventional and analogue solutions.
The conventional gas detectors are suitable for civil and industrial environments and they are different for gas type (flammable, toxic, explosive etc.) and housing.
The analogue gas detectors are suitable for industrial applications and they are different for gas type (flammable, toxic, explosive, etc.) and housing.