These air flow switches are used with air or non-combustible non-corrosive gases. The grids give reliable readings in a variety of 'in duct' locations. They control air supply and give warnings of over or under flow rates. These items are used widely in HVAC/R applications.
The AFG Flow Grid is a fundamental pressure sensing device designed to transmit a continuous differential pressure signal. When this output is connected to a suitable measuring instrument (i.e., manometer, pressure transducer, etc.), it may be used to determine air velocity and volume flow rate.