CN2456144Y - Level alarm - Google Patents

Abstract

The utility model discloses a liquid level alarm. The utility model is characterized in that the output terminal of a detection circuit of the alarm is connected with the input terminal of a comparison circuit, and the output terminal of the comparison circuit is connected with a power circuit and an alarm circuit. The utility model has the advantages of simple circuit and convenient use, and the alarm can achieve higher accuracy. The utility model can not only be used independently but also be connected with a system. The utility model can achieve the alarm requirements by testes in household dripping alarm and oil level alarm for mechanical devices for one year.

Description

Liquid level alarm

The utility model relates to electronic technology field, specifically mainly is the device that utilizes natural light and light activated element and electronic component that liquid level is detected and can report to the police.

Of the prior art liquid level is detected and the device that can report to the police mostly is the finite element network form of employing system, the function that does not have independent use, and these detection alarm apparatus structure complexity, the cost height is reported to the police inapplicable for some as the warning of the pasta on drop (extension garter), the plant equipment and other level control (LC) among a small circle.

The purpose of this utility model is to provide a kind of liquid level alarm, and it can satisfy drop and report to the police and other liquid level warning requirement among a small circle.

The technical solution of the utility model is achieved in that liquid level alarm, it mainly comprises housing and is contained in the warning device of housing, it is characterized in that: the testing circuit output terminal of this warning device is connected to the input end of comparator circuit, and the output terminal of comparator circuit is connected with warning circuit with power circuit.

The utility model circuit is simple, and is easy to use, and can make reports to the police reaches higher accurate precision, both can independently use, and also can be connected with system, reports to the police by the pasta on family's drop warning and plant equipment more than a year and tests, and all can reach the warning requirement.

Fig. 1 is an electrical connection diagram of the present utility model

The utility model will be further described below in conjunction with drawings and Examples.

The utility model mainly comprises housing and is contained in the warning device of housing, it is different from prior art and is: the output terminal of the testing circuit 1 of this warning device is connected with the input end of comparator circuit 2, the output terminal of comparator circuit 2 is connected with warning circuit 3 with power circuit, testing circuit is by resistance R 1, LED is formed, resistance R 1 is the biasing resistor of light emitting diode, G1 provides light source for transistor, comparator circuit is a voltage comparator circuit, it is by resistance R 2, R3, R4, transistor G1 and comparer IC1 form, wherein resistance R 3 is an adjustable resistance, by resistance R 5, transistor G2, diode D1, hummer and relay constitute warning circuit; Concrete in an embodiment connecting circuit is, one end of resistance R 1 respectively with resistance R 2, one end of resistance R 3, the power supply E positive terminal of comparer IC1+, one end of relay J, the end of diode D1, the moving contact KJ1 of relay J and an end of K switch 1 connect, the other end of K switch 1 is connected with the positive terminal of power supply E, the other end of resistance R 1 is connected with an end of LED, the emitter of the other end of LED and transistor G1, the other end of resistance R 4, the power-of comparer IC1 extreme one, the emitter of transistor G2, the negative pole end of hummer B and power supply E connects, the collector of transistor G1 respectively with the other end of resistance R 2, input end+the connection of comparer IC1, another input end one of comparer IC1 respectively with the other end of resistance R 3, one end of resistance R 4 connects, the output terminal of comparer IC1 is connected with an end of resistance R 5, the other end of resistance R 5 is connected with the base stage of transistor G2, the collector of transistor G2 respectively with the other end of relay J, the other end of diode D1 connects, the end of hummer B is connected with the other end of the moving contact KJ1 of relay J, the end of the moving contact KJ2 of relay J is connected with an output terminal a, the other end of the moving contact KJ2 of relay J is connected with an end of K switch 2, and the other end of K switch 2 is connected with another output terminal b.

Use of the present utility model is: insert detected material such as stilligout between light emitting diode and transistor G1, when in the stilligout full of liquid being arranged, photoresistance is less, transistor G1, regulate resistance R 3 and make its just do not report to the police (this moment, comparer was in critical conditions), transistor G1 is subjected to light more, the collector electronegative potential of transistor G1, one input end of comparer also is an electronegative potential, the comparer no-output; When in the stilligout that inserts between light emitting diode and the transistor G1 during no liquid, photoresistance increases, the light that transistor G1 accepts weakens, collector potential raises, one input end of comparer uprises current potential, the output terminal of comparer has output, moving contact KJ1, the KJ2 closure of high level in resistance R 5 oxide-semiconductor control transistors G2 promotion relay, the hummer buzzing is reported to the police, the exportable signal of two output terminals, K switch 2 in the circuit is used for the debugging of alarm, K switch 2 should be disconnected before the debugging, to avoid two output terminal output signals.

Claims (2)

1, liquid level alarm, it mainly comprises housing and the warning device that is contained in housing, and it is characterized in that: the testing circuit output terminal of this warning device is connected to the input end of comparator circuit, and the output terminal of comparator circuit is connected with warning circuit with power circuit.

2, by the described liquid level alarm of claim 1, it is characterized in that: an end of resistance (R1) respectively with resistance (R2), one end of resistance (R3), the power positive end of comparer, one end of relay, one end of diode, one end of moving contact of relay (KJ1) and switch (K1) connects, the other end of switch (K1) is connected with the positive terminal of power supply, the other end of resistance (R1) is connected with an end of light emitting diode, the emitter of the other end of light emitting diode and transistor (G1), the other end of resistance (R4), the power-of comparer is extreme, the emitter of transistor (G2), the negative pole end of hummer and power supply connects, the collector of transistor (G1) respectively with the other end of resistance (R2), one input end of comparer connects, another input end of comparer respectively with the other end of resistance (R3), one end of resistance (R4) connects, the output terminal of comparer is connected with an end of resistance (R5), the other end of resistance (R5) is connected with the base stage of transistor (G2), the collector of transistor (G2) respectively with the other end of relay, the other end of diode connects, one end of hummer is connected with the other end of the moving contact (KJ1) of relay, one end of the moving contact of relay (KJ2) is connected with an output terminal, the other end of the moving contact of relay (KJ2) is connected with an end of switch (K2), and the other end of switch (K2) is connected with another output terminal.

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