SU364847A1 - RADIO LEVEL - Google Patents

Description

one

The invention relates to distance gauges for transmitting information over a distance for measuring the level of water in wells.

Radio levels are known that contain a measuring unit, a voltage-to-frequency converter and a radio transmitter with a modulator, connected to an electronic-mechanical software device, a power supply unit, a radio or wire communication line, and a radio receiver with a recorder and recorder.

The proposed radio level meter differs from the known ones in that the output of the measuring unit, made in the form of a differential inductive pressure sensor, is connected to the input of a switch controlled by a software device, to the second input of which a calibrated voltage source is connected, and the output of the switch is connected to the voltage converter -frequency. These differences increase the measurement accuracy and reliability of the level gauge operation, since they enable monitoring of the normal operation of the equipment of the transmitting side.

FIG. 1 shows a block diagram of a radio level; in fig. 2 - power supply multivibrator circuit; in fig. 3 is a diagram of a software device.

The radio level meter consists of a membrane 1, a differential inductive pressure sensor 2, a multivibrator power supply 5 with an amplifier 4, a rectifier 5, a source of calibrated voltage 6, a switch 7, a voltage-frequency converter 8, a sealed enclosure 9, a radio transmitter with a modulator 10, software device 11, radio 2, the secondary device 13 and

Somographer 14.

Changes in the water level are sensed by the membrane 1 acting on the sensor plug 15 of the sensor 2. As a result, a variable voltage is produced at the sensor output, the amplitude of which is unambiguously determined by the pressure of the fluid. This voltage is rectified by the rectifier 5 and through the contacts of the switch 7 is fed to the input of the voltage-to-frequency converter 8.

When the liquid level changes, the frequency reproduced by the converter 5 changes. The signal from the output of the converter 8 is fed to the output of the radio transmitter 10, where it is modulated by a carrier, which through the antenna

the transmitter is radiated from the air.

At the receiving side, the high frequency signal is fed to radio receiver 12, where it is amplified and demodulated. The low-frequency signal is fed to the secondary device 13 and the recorder 14.

AC voltage supplying sensor 2 is produced by multivibrator 3 (Fig. 2) made on transistors 16 and 17 and amplified by amplifier 4 made on transistors 18 and 19. At the output of amplifier 4, a transformer 20 is connected, to the secondary winding of which windings are connected 21 of the sensor 2. The amplitude of the pulses supplying the windings 21 of the sensor 2 is stabilized by breakdown diodes 22 and 23 connected in series and counter, and connected in parallel to the winding 21.

The software device // (fig. 2, 3) with the contacts of the clock mechanism 24 at the specified time switches on the relay circuit 25, which contacts 26 connects the power source 27 to the equipment of the transmitting end. The power is also supplied to the multivibrator 25, made on transistors 29 and 30 and controlling the position of the relay 31, which the contacts of switch 7 produce alternately

connection to the converter input 8 of sensor 2 output, or output of a calibrated signal source 6.

Subject invention

A radio level meter containing a measuring unit, a voltage-frequency converter and a radio transmitter with a modulator, connected to an electronic-mechanical software device, a power supply unit, a radio or wire line, and a radio receiver with a recorder and recorder, characterized in that, in order to increase the accuracy of the copy and reliability of the sensor, the output of the measuring unit, made in the form of a differential inductive pressure sensor, is connected to the input of a switch controlled by a software device, toromu entry which is coupled a calibrated voltage source, and the switch output coupled to the input transducer "n pr-frequency voltage.

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