As a general-purpose limit switch

which is intended primarily for indoor use to provide protection against contact with enclosed equipment and a degree of protection against falling dirt

this boiler pressure sensor continuously monitors differential air pressure to verify proper airflow before the burner cycle initiates

though performance is best maintained when installed downstream of an aftercooler

ensuring consistent burner manifold pressure for efficient combustion

Armstrong Fluid Technology 816013-111K Flange Set 326010-701 As a general-purpose limit switchThe Armstrong Fluid Technology 816013 111K Flange Set and Hardware Kit is built for secure, leak resistant connections on hydronic circulator installations. This 3 4 inch flange kit is designed to match Armstrong pump connections, providing a proper seal and alignment when mounting circulators in closed loop heating or chilled water systems. Constructed from durable cast iron, this circulator pump flange set handles typical system pressures and