SU581380A1 - Level sensor for volumetric liquid metering device - Google Patents

Description

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Ieobreggen is responsible for the control of the technological parameters of media in von spontaneous plants and can be straightforward in the metallurgical, chemical and other industries.

KYUYSTNY dachv w ypoBHHi containing ultrasonic transducers or other ultra-sonic oscillations, which are received and form them after being passed through the medium and when exceeding the voltage on the receiver of a given threshold, produce a signal for the presence of a liquid, at a given point, use a factor.

The closest to the technical point of view of the present invention is a level sensor containing an ultrasonic direct-emitting transducer connected to Het (iy by a pulse generator and a receiving amplifying unit, the output of which is a cut-off cascade connected at the output to the forming unit.

The disadvantage of the known device ow is the error. Due to the instability in time nile of 6 "nektrich

characteristics of a receiving-acoustic acoustic transducer and a significant amount of changes in the amplitude of the oscillation in the medium caused by a non-attenuation factor.

G. Gel invention - improving the accuracy and reliability of the level indication.

 This is achieved by the fact that the sensor is equipped with a series-connected peak detector and attenuator, the detector input being connected to the output of the receiving / amplifying unit, and the output of the attenuator to the controlled input of the cut-off stage.

The drawing shows the structural scheme of the proposed sensor.

The sensor contains a receiving-emitting transducer ii mounted on the walls. ke 2 with dosing phpog reagent 3, by pulse to the transducer pulse generator 4 and the receiving-amplifying unit 5, the cut-off cascade in and the forming unit 7, the transceiver amplifying unit has a cascade 8 connected in series of delay 9 s. robot pulses and selecto). power amplifier lOt a and forming unit 7 - sequentially connected detector 11 | limiting amplifier 12i integrator 13 R relay cascade 14. The sensor of the doaator is supplied with a peak detector 15 and an attenuator 16 connected to a controllable input of the cascade 6. The device works as follows By means of a receiving acoustic transducer 1, a pulse of ultrasonic vibrations is periodically introduced into the wall 2 of the transducer "Humor with dispensing with oapeagititis 3. Wool excitation is carried out electrically with pulses of 17 ren epeefopa 4. Multiple pulses in ultrasonic imaging device 1 transform in st." Bee peaepeyajpa " 53chc per impulse & 18 eectic oscillations of ultrasonic sound) of frequency. Together with vozbu sh shSh and us. these pulses are iMt in the mudflow window, amplify l € with a generator 9 strobe pulses, 4Pfwepy M x from pulses 4 n aad revshkyh in cascade 8 on it | Revision & The output pulse of the excitation pulse, 3, cuts this into the usual pulse 17 of the generator 4 at the output of the selector amplifier 10 and will not be applied. With the output amplifier MHoroiqpaTHo reflected. Voschup t. n. in peak ektekto 15 and in the cascade cuts off in. The peak detection of pulses that are extinguishing in the neg wave forms 1) is equal in magnitude to the peak amplitude in micropulses. This voltage is fed through the entertainer 16 to the control input of the cutoff cascade 6 "and constitutes a portion of the output peak detector peak. At the same time, the E-section of the E-section changes proportionally to the 2-dimensional oscillations emitted into the wall, thus monitoring the changes in the piezoelectric characteristic of the acoustic transducer 1. In the cascade of the cut-off 6, the pulses received by them are limited to lower amplitude, the value of which is set to less peak value of their amplitude. Cut off the upper part of the pulses 1k pressure into the detector 11, where you envelope it. It is amplified up to the limitation from above in the amplifier limiter 12. The amplified video pulse from the output of the amplifier limiter 12 enters the integrator 13. In it, the video pulse having a duration t, in the presence of zitskostv and 12 without the wiring of the converter 11, is integrated during the input period pulses into the wall. At the same time, 11-4G. After integration, an electrical voltage is received from both the envelope in the presence of liquid or the voltage EZ of the envelope in the absence of liquid, and the magnitude of the resulting resultant carries information, in such a way, Watt Bitoe environment {air or gas) in the zone of input of the pulse of ultra oscillations. This voltage is compared to C: oh err1m voltage ECtl.-tE.If,) B |} c) cascade 14 and from the difference aeVsHadeE.I. form a signal 19 weirh dosing. With a positive signal, the presence signal is generated, and the irradiation signal is a signal of the absence of liquid on the gravity of the dosing volume, measuring tank 2, in accordance with inventions Sensor: level for a volumetric liquid metering device containing an ultrasonic switch and connecting to it a pulse generator and an amplifying unit, at the output of the second, a cut-off cascade is installed, connecting at the output with the forming unit | I differ ift and so that, in order to improve the accuracy and reliability of the level indication, the sensor is equipped with a sequentially switched on peak detector and an atteshoator, and the input of the detector СШ1Ш {vn with the output of the receiver amplifying unit, and the output of the attenuator with the controllable input of the cutoff stage . Sources of information taken into account in expert evaluation: 1. USSR Copyright Certificate №325028. cl. In O1 3 4/02, 1971, 2. US Patent No. 3213438, cl. 340-3, 1865. 3. Pas: ent of France No. 1474171 cells, QO1 P, 1967.

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