System for Calibration of a Differential Pressure Transducer.
U S Pat 3 508 431 1970 Apr; :
A first conduit, having a gas supplier and deadweight gage, is attached adjacent to one side of a ap transducer sensor. A volumetrically-controlled second conduit, having a pressure monitor and valved connection with the first conduit, is attached adjacent to the other side of the sensor. The conduits are maintained in fluid connection with one another and the gas supplier produces a first pressure throughout both conduits that is precisely measured with the deadweight gage. The conduits are then disconnected and the gas supplier is employed to increase the pressure only in the first conduit to establish a differential across the sensor. Any pressure deviation in the second conduit from the first pressure is corrected, and the new pressure in the first conduit is then measured with the deadweight gage. The difference between the first and the new pressures is calculated and compared with the value shown on the transducer readout.
U.S. Pat. 3,508,431, Apr. 28, 1970, Chem. Abstr. Not Found