For installation in areas where smoke and krotat will harm the people and equipment that is susceptible to damage. But bringing power when a fire is not required.
For installation in areas where smoke and acidity may be harmful to people and equipment susceptible to damage. The conductivity when fires do not want.
For installation in the area of smoke and pH might endanger and equipment sensitive to ารเสียหาย. But the electrical conductivity when the fire didn't want