AIR FILTER CONTROL ARRANGEMENT
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Abstract
APPARATUS TO INDICATE THE CONDITION OF AIR FILTER MEDIA IN AN AIR FLOW CONDIUT AND TO CONTROL THE REPLACEMENT OF SUCH AIR FILTER MEDIA WHICH INCLUDES MEANS SENSITIVE TO CHANGE IN DIFFERENTIAL AIR PRESSURE BETWEEN THE UPSTREAM AND DOWNSTREAM SIDE OF THE MEDIA TO INDICATE THE CONDITION OF THE MEDIA, ADVANCE CONTROL MEANS TO ADVANCE A SELECTED LENGTH OF NEW MEDIA INTO THE AIR FLOW STREAM, AND SWITCH MEANS INTER-CONNECTED WITH THE FILTER MEDIA ADVANCE MEANS TO TERMINATE AIR FLOW THROUGH THE CONDUIT WHEN THE FILTER MEDIA IS CHANGED SO THERE IS NO DIFFERENTIAL PRESSURE ACROSS THE MEDIA AND THE DIFFERENTIAL PRESSURE SENSING MEANS IS RESET.
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