Methane sensor is used in coal mine safety detection system to continuously monitor methane concentration in coal mine underground, mining face, goaf, return air roadway, electromechanical chamber and so on. When the methane concentration exceeds the limit, it can automatically send out an audible and visual alarm, which can be used by underground workers, methane detectors, underground managers and so on. , can also be used in the above places.
principle of operation
Generally, a supported catalytic element is used as a detection element. A weak signal proportional to the methane content is generated, which is amplified by a multi-stage amplifier circuit to generate an output signal, which is sent to the on-chip A/D conversion input port of a single chip microcomputer to convert the analog signal into a digital signal. Then the signal is processed by single chip microcomputer to realize the functions of display, alarm and so on.
Intelligent methane sensor
I. Sensitive elements of methane
MH-440V/D？ Infrared gas sensor is a universal, intelligent and miniature sensor. The sensor uses NDIR principle to detect CH4 in the air, with good selectivity, independent of oxygen, stable performance and long service life. Built-in temperature sensor for temperature compensation. The sensor is a compact infrared gas sensor, which combines mature infrared absorption gas detection technology with micromachining and excellent circuit design.
The sensor is easy to use, can be directly used to replace catalytic combustion elements, and is widely used in various occasions where flammable and explosive gases exist.
develop
Methane sensor is a mine instrument, which must first meet the requirements of underground safety production, but compared with other commonly used sensors, it must have the following main characteristics: it has the function of automatic zero adjustment; The calibration has higher reliability, more stable performance and easier use; Using high-resolution single chip microcomputer, the measured value is accurate and reliable; The machine has the function of automatic zero stabilization; Optional debugging menu structure, convenient debugging and simple operation. The existing methane sensors generally have the disadvantages of high power consumption, single function and low accuracy, and the anti-interference ability and intelligence of the system are very low because of the adoption of analog circuit technology. Therefore, it is of great application value to develop a portable, multifunctional, high-precision and high-reliability methane detector with strong anti-interference ability.
The new methane gas sensor must have reliable, stable and safe underground gas measurement function, which can play an important role in preventing underground safety accidents and has the value of popularization and application.
Infrared methane sensor is a methane gas detector developed to monitor the concentration of methane gas in pipeline. The instrument adopts infrared absorption principle, diffusion sampling, digital temperature compensation, integrated gray-water separator and other technologies, with high detection accuracy, strong environmental adaptability, stability and reliability. It is suitable for methane gas detection in coal mine gas drainage pipeline, gas drainage pumping station, gas filling station gas pipeline, gas power plant gas pipeline, city gas pipeline and natural gas pipeline.
Maintenance of methane sensor
The maintenance of methane sensor is complicated, so it is best to leave it to professionals. And after the methane sensor is repaired, remember to adjust it. The maintenance of CGW intelligent methane sensor is introduced as an example.
By adjusting the zero potentiometer of the gas sensor, the display value is greatly adjusted, but it is quickly reduced to a small value after operation. Analysis: The numerical value always shows normal changes, indicating that the amplification, v/F, microcomputer control and alarm circuit are all normal, and it can only be suspected that it is a bridge. Measure the bridge voltage of 3.5V with multimeter, which is normal. When the positive and negative poles of the bridge power supply are replaced, it is found that the display value is getting bigger and bigger, so it can be judged that the fault is caused by the aging of black and white components. Replace, troubleshoot, check with standard gas and put it into underground use.
Bian Xiao introduced the methane sensor to everyone. This happens when the methane sensor exceeds a certain concentration. Optical alarms are mainly used in coal mine safety production and natural gas use places, such as family kitchens. Then, the working principle of methane sensor is introduced. Briefly, the supported catalytic element is used as a detection element. A weak signal proportional to methane content is generated, which is amplified by multi-stage amplifier circuit to generate an output signal, which is converted by a/d signal. Then the signal is processed by single chip microcomputer to realize the functions of display, alarm and so on. The development of methane sensor is also introduced. Finally, the maintenance of methane sensor is introduced. Be sure to adjust it after maintenance. I hope that through Bian Xiao's introduction, you can have a clearer understanding of methane sensors.
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