Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Intelligent Differential Gas Flow Measurement Device With Acoustic Multivibrators ZH.A. SUKHINETS, A.L. GALIEV, O.O. VALIAMOVA, A.I. GULIN The article describes an approach to increasing the reliability and speed of gas flow measurement by an intelligent flow meter based on acoustic multivibrators (AM). The analysis of the factors that cause measurement errors during the operation of flowmeters in various conditions is carried out. The main error occurs under normal operating conditions of the measuring instrument. If the operating conditions deviate from the normal ones, an additional error occurs. In practice, the most common cause of additional error is a change in the temperature of the measured gas. Also, the disadvantage of the well-known flowmeters based on AM is the loss of performance when one of the measuring channels fails. A scheme of a differential gas flow meter is proposed, which eliminates the additional error due to changes in the parameters of the measured gas. The device includes two measurement channels and an information processing unit. Each measurement channel contains an AM, a piezoelectric converter (PEP) for converting an acoustic signal into an electrical one, and an amplifi er. An amplifier based on a specialized MH2XA010-05 chip for processing acoustic sensor signals from a piezoelectric element solves the problems of digital signal processing measured by an intelligent sensor. The information processing unit contains a frequency subtraction circuit and logic elements from which the signal is sent to the output of the device in the event of a failure of one of the measuring channel. In this way, the flowmeter remains operational when one of the measurement channels fails. Keywords: gas flow rate, jet generator, intelligent sensor, differential measurement scheme, acoustic multivibrator. DOI: 10.25791/pribor.3.2021.1245 Pp. 16-22.