Acetone Concentration Detector For Research And Design

With the rapid development of modern technology and modern industrial progress,acetone in industrial production and people living in the area of application more widely. Although the acetone to the production and livelihood for people to provide a lot of convenience to create a lot of value, but they will be leaked poisoning caused the explosion or fire a hidden danger, a serious threat to people's lives and property. Therefore, if not quickly and accurately detect industrial and domestic content of acetone, the acetone to prevent leakage, it can not guarantee the safety of the use of acetone. So for high-performance portable acetone instrumentation research and development has always been a concern of the people. For this purpose of this paper is based, use STC12C5412AD microcontroller as the core, design a set of acetone intelligent detection system.In this design, acetone detector is the main function of fast and accurate detection of acetone in the measured gas content. Acetone mixed gas chamber after the electric field, ionosphere into electronic, photonic, ions, free radicals and the activity of atoms, excited atoms, and so on, into the light-reaction, in the role of ultraviolet dissociation, in accordance with a certain ratio of acetone Into CO, CO gas generated through the CO sensor output signals generated by the microcontroller as the core data-processing system shows the results of the analysis of acetone. Through the LCD screen will show acetone gas concentrations when the gas concentration reached a certain threshold when the alarm sound and light, in order to improve the practicality of the system of the human-machine interface design, and computer communications port, battery detection devices, pumps Gas unit. In order to achieve the above functions: System should have a field ionization chamber, light of the reactor, CO sensor circuit, Operational amplifier, to maintain sampling circuit, SCM and its peripheral circuits, voice alarm power, status light circuits, liquid crystal display circuit concentration, Keyboard control circuit, RS-232 communication interface circuit and a PC component.In this paper, the design of acetone gas detector from the detector circuit and the MCU control a majority of two. According to the design requirements, the use of the environment, cost and other factors, Motorola optional carbon monoxide sensors MGS1100 gas sensor. The sensor is a good variety of flammable gas sensitive type of broad-spectrum sensitive semiconductor devices. The sensitivity of its modest, response and recovery characteristics of a good, long-term stability, reproducibility, vulnerable to the environmental impact and effects of temperature and humidity, and other advantages.SCM system in the control circuit design, using a high-performance, high integration of STC12C5412AD SCM as a core chips, made full use of its high-speed data processing capability and rich on-chip peripherals, and the equipment of small and Intelligent. The dashboard is simple in structure, stable performance, small size, low cost advantages.C-language application to prepare and make full use of chip resources, improve the accuracy and efficiency of the implementation of the code, reducing the capacity of the code, using the median value of the digital filter algorithm to A / D converter after the digital signal processing to filter. This approach can also interfere with filtered filtered on the pulse of random interference, not only ruled out at the maximum noise interference, acetone gas detector lower probability of false positives, but also more easily achieved in SCM.As gas sensor in the heating needs of state, the higher the temperature, the faster response, response time and recovery time will be. To improve response to wait to ensure that sensor accurately and steady work, to the alarm needs a gas sensor continuous output voltage of 5 V. In order to ensure the reliability of the output voltage of 5 V at the same time, the fault monitoring. When the sensor heating wire or cable connection is bad or disconnected and sensors, a fault alarm.Acetone gas alarm in a wide temperature range, can be acetone gas concentrations on the LCD display. When the acetone gas concentrations reach a certain level, a sound and light alarm. Since the fault is also a function of rapid diagnostic testing and repeated delay alarm function.In this paper developed on the basis of alarm, could make the appropriate extensions, so that the acetone gas detector function better, more secure, more convenient to use. In order to further improve security, can automatically sound and light alarm on the basis of using SCM drive relays, led flammable gas pipeline valves or other gas leak shut down the source device. Another function is to be expanded with the host computer (PC) for telecommunications, gas concentration data can be uploaded from the computer record-keeping, can also use the computer to complete on-site far from real-time measurement and control functions.System in the temperature of 20℃environment for the conduct of the test. Through the acetone gas concentrations and the actual measured by the acetone gas concentrations can see the comparison of the system meet the system's basic design requirements, to achieve the acetone gas concentrations indirect rapid and accurate detection.