MASS FLOWMETER WITH SENSOR GAIN CONTROL

摘要

MASS FLOWMETER WITH SENSOR GAIN CONTROL (D#PC-1132) A mass flow rate meter is provided having two U shaped tubular flow loops, means for vibrating the flow loops like the tines of a tuning fork. Opto-electrical sensors on opposite legs of the flow loops generate signals indicative of the times between the passing of the sides of the loop through the static plane of the loop. The times between the passing of the sides of the loops through the static plane may be combined to derive the mass flow rate of material flowing through the loops. Means are provided for varying the gain of the optoelectrical sensors to provide for a constant performance under conditions of changing temperature, voltage variations and aging characteristics. -I-