Electronic liquid level meter

Abstract

The invention discloses an electronic liquid level meter. The electronic liquid level meter comprises a measuring circuit arranged in a shell, and a sleeve arranged outside the shell; a communicating pipe is arranged between the upper end of the sleeve and a tank body serving as a measurement object; the electronic liquid level meter further comprises a current converter which is used for converting the current of the measuring circuit into an electric signal; the measuring circuit comprises a power interface, a plurality of insulated gate bipolar transistors (IGBTs) and a resistor string; the positive electrode of the power interface is connected with the measuring resistor at the head end of the resistor string and the collector electrode of each IGBT; emitting electrodes of the IGBTs are respectively connected among the resistors; each IGBT is also provided with a corresponding RC buffer circuit; the cathode of the power interface is connected with the protective resistor; grid contacts of the IGBTs are arranged outside the shell; a floater contact which is used for conducting the corresponding IGBT by being in contact with a pole contact is arranged in the sleeve; and a connecting wire connected with the floater contact is connected with a floater through a communicating pipe. According to the electronic liquid level meter, the service life of the electronic liquid level meter can be effectively prolonged, and the electronic liquid level meter has high measurement precision and low failure rate.

Description

Technical field[0001]The present invention relates to the field of measurement, and more particularly to an electron-type liquid level meter.Background technique[0002]In the storage device required for industrial production of storage tanks, buffer tanks, the level of liquid level is often used to indicate the level information of the material in order to perform other operations associated therewith.[0003]In the prior art, the working principle of the currently used liquid level meter includes: using a combination of the reed and the magnet, a transmission electrical signal is realized by the magnet magnetic force insertion. Specifically, this level of float is raised or decreased with the change in the liquid level during operation, and the reed tube is in the magnet. The corresponding position is enabled, thus, the different circuit conduction mode is configured, and the number of currents in the circuit is controlled by the number of series resistances corresponding to the circu...

AI Technical Summary

Problems solved by technology

[0005] The mechanical action of the iron sheet inside the dry reed switch is attracted by magnetic force, which is prone to stress aging during use, and then failures such as suction or disconnection are not in place, or even damaged; therefore, the service life of this liquid level gauge too short

An electronic liquid level gauge is described in an unpublished patent, which can greatly improve the service life of the liquid level gauge; the inventor found through research that the above electronic liquid level gauge exists under certain circumstances The defect of inaccurate indication

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