LOW COST AIR PRESSURE INDICATOR
Original Publication Date: 1982-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
In a machine which uses air or other gas at super-atmospheric and sub-atmospheric pressures to effect different operations, the correct setting of these pressures can be visually monitored by incorporating flowmeters in communication with respec-tive conduits. Preferred f lowmeters are of the ball-in-tapered-tube type. Positive pressure lines are connected so that the flow of gas lifts the ball until it stabilizes at a height related to the gas pressure, which is a function of the gas flow rate. Suction lines are monitored by causing air, in flowing from the atmosphere into the suction line, to lift the ball similarly. The transparent tube of the flowmeter, or the housing, can be calibrated to enable a service engineer to read quickly the pressure in the respective conduit, thus reducing installation, diagnostic and rectification times.