SU1278593A1 - Liquid maximum level warning device - Google Patents

Abstract

The invention relates to technical physics and makes it possible to work with especially aggressive fluids. A thin metal electrode 2 with a pointed lower end is placed in the case 1 of non-conducting chemically resistant microporous material in such a way that a gap is formed between its lower end and the bottom of the case 1. A sequence of high-voltage pulses with an amplitude sufficient to form a corona discharge at its lower end is supplied from unit 3 to the metal electrode 2. A change in the strength of the sound produced by the electric discharge, and, accordingly, the mechanical oscillations of the electrode, perceived by the piezoelectric transducer 5, connected via the amplifier 6 to the signaling unit 7, is judged by the liquid-controlled bottom of the cover. 1 il.

Description

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The invention relates to technical physics and can be used to signal the level of liquids.

The purpose of the invention is to provide an opportunity to work with especially aggressive liquids.

The drawing shows the block diagram of the detector.

The detector contains a probe, which is a fluoroplastic case I closed on the bottom side, in which a metal electrode 2 is placed so that there is a gap between its pointed lower end and the bottom of the case. The electrode is connected to the unit 3 high-voltage pulses. The upper end of the electrode is mounted on an isolator 4, on which a piezoelectric transducer 5 is also connected, connected through an amplifier 6 to an alarm unit 7.

The detector works as follows.

A sequence of pulses of amplitude 10–20 kV with a frequency of following 100 Hz is fed to the metal electrode. In this case, a corona discharge is produced at the pointed lower end of the electrode, which produces a relatively weak sound, the frequency of which is determined by the frequency of the high-voltage pulses.

When a controlled fluid bottom reaches the fluoroplastic body, the number of electrons flowing from the pointed lower end of the metal electrode into the liquid through the micropores of the bottom increases. At the same time, the aggressive liquid is controlled due to the smallness of the pores and the non-wetting of the bridge does not take the fluoroplast inside the body, due to which the metal electrode is not exposed to its action.

With an increase in the number of electrons flowing into the liquid, the sound produced by the corona discharge is amplified, and consequently, the mechanical oscillations of the metal electrode, which are transformed into electrical impulses using a piezoelectric transducer mounted on an insulator. These pulses are amplified by an amplifier and then fed to a signaling unit that converts electrical pulses into sound, light, or other signals.

The thickness of the bottom, and the housing is selected depending on the voltage of high voltage pulses. The gap between the pointed lower end of the metal electrode and the bottom of the housing, as well as the frequency of the high-voltage pulses, are chosen based on the maximum sound effect created by corona when touched by the aggressive fluid controlled by the corrosive fluid.

Claims (1)

Invention Formula The liquid level limit indicator, containing a probe made in the form of a fixed upper miter on the insulator of a metal electrode placed in a housing and connected to a power source, as well as an alarm unit, characterized in that aggressive fluids, a piezoelectric transducer with an amplifier is inserted into it, and the housing is closed on the underside of the bottom and made of fluoroplastic, and there is a gap between the bottom and the lower pointed end of the electrode; The m power source is a high-voltage pulse unit, and the piezoelectric transducer is acoustically connected to the electrode and connected via an amplifier to the alarm unit.