Toxic and harmful gas alarm circuit system with automatic adjustment function

Abstract

The invention relates to a toxic and harmful gas alarm circuit system with automatic adjustment function, comprising a gas-sensitive sensing circuit, a microprocessor, a voltage frequency conversion module, a voltage stabilizer module and a photoelectric language alarm circuit; the gas-sensitive sensing circuit consists of a digital potentiometer and a gas-sensitive sensor; one end of the digitalpotentiometer is connected with output voltage of the voltage stabilizer and the other end is connected with the gas-sensitive sensor; an adjusting end is connected with a control port of the microprocessor; the voltage output by the gas-sensitive sensor is converted into frequency signals which form linear relationship with the voltage by voltage frequency conversion module and then is output toan input port of the microprocessor; corresponding to a certain gas concentration, the expected value of the input port of the microprocessor is set; if the practical voltage value output by the gas-sensitive sensor deviates from the expected value set on the input port of the microprocessor, the deviation value is calculated by the microprocessor and is stored in a storage of the microprocessor;the microprocessor uses the deviation value as a corrected value of practical operation and carries out judgment on the basis of the corrected value. The toxic and harmful gas alarm system can automatically complete toxic and harmful gas alarming, saves time and labor, reduces production cost and enhances stability and reliability.

Description

technical field [0001] The invention relates to a toxic and harmful gas detection and alarm device, specifically a toxic and harmful gas alarm circuit system with automatic debugging function, which is suitable for the safety detection of toxic and harmful gases in homes, hotels, hotels, laboratories and other places, especially It is the leak detection of domestic gas, laboratory toxic gas, etc. Background technique [0002] With the completion of my country's natural gas transmission project to the east, more and more urban residents can use these such as coal gas, natural gas or liquefied petroleum gas. However, most of these gases are poisonous, flammable and explosive gases. Once leaked, it will cause pollution to the use environment and even cause fire or explosive accidents. In order to ensure the property and personal safety of the country and residents, it is particularly important to detect combustible and harmful gases in the use environment, and the alarm of con...

AI Technical Summary

Problems solved by technology

However, at present, due to the limitation of domestic technical conditions, the parameters of domestic gas sensors are highly discrete. In the production of the whole machine, it is necessary to adjust the comparison circuit or the reference circuit one by one to ensure the consistency of the performance of the whole machine. Therefore, the installation and adjustment workload Large, high production cost, it is difficult to achieve large-scale industrial production; although similar foreign sensors have better performance, they are relatively expensive, resulting in high production costs and inconvenient civilian promotion

In addition, the existing toxic and harmful gas alarm systems such as gas alarms use more discrete hardware, which makes the alarms greatly affected by other factors in the environment and unstable in performance; Language alarm, and it is not clear that the first-level alarm is an environmental pollution hazard alarm, and the second-level is a fire alarm.

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