Detection alarm of conducting liquid

Abstract

In the present invention, the circuit includes sampling unit, detection unit, output unit and executing unit. A transformer is connected between the sampling unit and the detection unit, the AC wave generator circuit in the secondary side provides drive current and the AC voltage in the primary side is applied across the detection electrodes. The detection unit includes current-to-voltage converter circuit, rectifier and filter circuit, comparator circuit, and executing circuit to send out signal. The present invention has simple structure, small size, less error action. The detection circuitand the tested circuit are separated electrically and this can protect the detector, avoid interference, avoid the damage of the detection electrodes, increase their service life, and monitor the tested environment in real time.

Description

technical field [0001] The invention relates to a detection device of an alarm monitor, in particular to a detection alarm and a circuit for detecting whether water or other conductive liquid exists in an environment to be detected. Background technique [0002] The existing various alarm monitors mostly focus on the anti-theft function. In the field of industrial control, it is often necessary to detect the presence of water or other conductive liquids or whether they are flooded or leaked. less, or almost none at all. Such as a kind of alarm monitoring device disclosed in Chinese Patent No. ZL92239350.8 "Multicore Cable Harness Alignment, Short Circuit, and Disconnection Detector", which is composed of main and auxiliary machines, and the main and auxiliary machines are respectively connected to the two ends of the cable under test during measurement; Two-terminal monitoring must be used, which will naturally lead to the disadvantages of high cost, slow feedback, and low ...

AI Technical Summary

Problems solved by technology

Such as a kind of alarm monitoring device disclosed in Chinese Patent No. ZL92239350.8 "Multicore Cable Harness Alignment, Short Circuit, and Disconnection Detector", which is composed of main and auxiliary machines, and the main and auxiliary machines are respectively connected to the two ends of the cable under test during measurement; Two-terminal monitoring must be used, which will naturally lead to the disadvantages of high cost, slow feedback, and low efficiency. Due to the long distance, it is even unfeasible in many cases, and there is no special research on whether water or other conductive liquids soak the protected object; The same problem exists in the design content shown in the Chinese patent No. ZL92226127.X "Multicore Cable Tester"

In addition, the existing technology also has the following disadvantages: first, there is no electrical isolation between the detection circuit and the liquid to be tested; second, the anti-interference ability is poor, and the misoperation rate is high when working in harsh environments; third, the current signal used for detection Most of them are direct current, which easily oxidizes and corrodes the detection electrode, shortening the service life of the electrode

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