Gas leakage alarm controller with intelligent alarm threshold value and control method thereof

Abstract

The invention discloses a gas leakage alarm controller with an intelligent alarm threshold values. The gas leakage alarm controller comprises at least one gas sensor, a microprocessor and an executing control mechanism controlled by the microprocessor, wherein each gas sensor is connected with the microprocessor via a resistance / voltage converting circuit, the microprocessor prestores a characteristic curve and the combustible gas alarm concentration value of the gas sensor and utilizes clean air as datum, compares voltage signals received from the resistance / voltage converting circuit with voltage value of the prestored characteristic curve and determines and stores the alarm threshold values corresponding to the gas sensors. The gas leakage alarm controller with the intelligent alarm threshold value has the advantages of no need to test the combustible gas alarm concentration, higher production efficiency, no pollution and convenience in use.

Description

technical field [0001] The invention relates to the field of gas leakage alarm devices, in particular to an intelligent gas leakage alarm controller, specifically, an intelligent gas leakage alarm controller with an alarm threshold that can automatically calibrate the alarm concentration value. Background technique [0002] At present, known gas leakage alarm controllers generally adopt an analog circuit structure, which increases with the increase of the concentration of combustible gas in the air according to the conductivity of the sensor. The change in conductivity is converted into an output signal corresponding to the concentration of combustible gas, and the gas sensor will change the characteristics of the resistance value when it is exposed to combustible gas of different concentrations. [0003] attached figure 2 Connect the gas sensor and a variable resistor to the two input terminals of the comparator respectively, and then send out a level alarm signal by compa...

AI Technical Summary

Problems solved by technology

[0006] This intelligent gas leakage alarm controller with one-time memory for the calibration alarm concentration and its control method not only improves production efficiency, but also reduces environmental pollution, although in the production process of this intelligent gas leakage alarm controller, It only needs to be debugged once for each intelligent gas leakage alarm control device, but it still needs to be debugged with combustible gas, and there is still room for improvement in production efficiency, and although there is only a small amount of emissions, it will still pollute the atmosphere

Moreover, in the actual application process, sometimes the gas sensor needs to be replaced, and there are many different types of gas sensors on the market. When they are exposed to the same concentration of combustible gases, their resistance values ​​are not the same. There is still a difference in performance, so if the above-mentioned intelligent gas leakage alarm control device is used, it can only be debugged again, and the resistance value under the alarm concentration of combustible gas is stored again, which is still troublesome to use

Images