SU1186977A1 - Pressure transducer with frequency output signal - Google Patents

Abstract

A PRESSURE SENSOR WITH A FREQUENCY OUTPUT SIGNAL, containing a straight manometric tube fixed in the housing with an inlet fitting and a system for exciting and receiving tube oscillations, characterized in that, in order to increase the sensitivity by creating a force that stretches the tube along the axis, it is provided with a bellows two bottoms, one of which is plugged, and the other has a central opening with a sealing partition installed in it, equipped with an opening, while the manometric tube is passed through the opening the sealing partition and its plugged end are rigidly attached to the plugged bottom of the bellows from inside, the bottom with the hole is fixed on the casing, and the sealing partition is rigidly connected to the manometer tube, and B part of the manometric tube located inside the bellows is fixed radial hole. 00 a S & m -J / -7 (/ l /

Description

The invention relates to a measuring technique and can be used in devices for measuring the overpressure of liquid and gaseous media in the chemical, petrochemical and other sectors of the industry.

FIG. .1 .i-zche% Agen proposed sensor, general view; in fig. 2 - section yy u. one .

Sensor, coftepjtefi body 1 with fitting 2 for input &: pressure pressure feo inside the manometric tube 3. End of the tube Attached to the bottom 4 of the bellows 5, the second bottom 6 of which is attached to the body 1. The internal cavity 7 of the bellows communicates with the internal cavity of the tube through the hole 8. A flexible partition 9, for example, in the form of a bellow with a small effective area, was used to seal the tube at the point where the tube entered the bellows. To excite tube oscillations

applied 10 pathogen oscillations, the receiver 11 and the amplifier 12 included in the circuit of the oscillator. The sensor input is a frequency, which is measured by a frequency meter 13, calibrated in units of measured pressure.

The sensor works as follows.

The measured pressure goes inside the tube 3. Due to the increase in the distance between the tube walls, its stiffness increases. At the same time, the measured pressure through the opening 8 enters the internal cavity 7 of the bellows 5, the bottom 4 of which, moving, creates a force that stretches the tube, which leads to an additional increase in stiffness and, consequently, the frequency of the tube oscillations. The frequency is recorded by instrument 13.

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Claims (1)

PRESSURE SENSOR WITH FREQUENCY OUTPUT SIGNAL, comprising a direct manometric tube fixed in the housing with a supply fitting and a system for exciting and receiving oscillations of the tube, characterized in that, in order to increase sensitivity by creating an effort stretching the tube along the axis, it is equipped with a bellows with two bottoms, one of which is plugged, and the other has a central hole with a sealing partition installed in it, equipped with a hole, while the pressure tube is passed through the hole of the hermetic the septum and its sealed end is rigidly attached to the sealed bottom of the bellows inside it, the bottom with the hole is fixed to the body, and the septum seam is rigidly connected to the pressure tube with the edge of its opening, moreover in the part of the manometer tube, located inside the bellows, a отверстие radial hole is made.