Accession Number : AD0610177

Title :   DEVELOPMENT OF A DIRECT READING FLOW METER.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : South,David John

Report Date : AUG 1964

Pagination or Media Count : 68

Abstract : An electronic device which can be used with a sharpedged orifice to directly measure the mass flow rate of gaseous fluids was developed. The device uses potentiometer-type pressure transducers to measure the pressure upstream and across the orifice and operates on these measurements to produce an indication of mass flow rate. The flow meter is a small self-contained unit; the electrical inputs from the transducers enter the device through connectors on the chassis. D-C voltages are used throughout the flow meter. Differential amplifiers, cathode followers, and a regulated power supply are used to reduce drift. A zener diode network is used to establish a circuit whose output voltage is proportional to the reciprocal of its input voltage. Experiments using the flow meter indicate that measurement errors are on the order of ten per cent or less over a flow range of twenty to one if two orifices are used. Only compressed air was used during the tests. (Author)

Descriptors :   (*FLOWMETERS, GAS FLOW), (*GAS FLOW, FLOWMETERS), PRESSURE GAGES, TRANSDUCERS, VOLTAGE, POWER SUPPLIES, DIODES, CIRCUITS, COMPRESSED AIR, FLUID MECHANICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE