As the "eye of precision detection" for modern industrial and environmental monitoring, the extraction laser gas analyzer plays an important role in various fields such as environmental protection, chemical industry, and energy due to its high precision and sensitivity. Mastering its correct usage techniques not only ensures accurate data, but also extends the lifespan of the equipment. This article will take you through a comprehensive understanding of this technology.
1、 Introduction to the working principle of extraction laser gas analyzer
The core principle of laser gas analyzer is tunable semiconductor laser absorption spectroscopy (TDLAS) technology. When the laser beam passes through the gas to be measured, specific wavelengths of laser will be selectively absorbed by gas molecules, resulting in a decrease in laser intensity. By detecting the intensity of absorption spectral lines and using Lambert Beer's law, the concentration of gas can be accurately calculated.
This technology has high resolution and strong anti-interference ability. Due to the unique "spectral fingerprint" of each gas, laser gas analyzers can accurately identify target gases without being affected by other background gases. In addition, it adopts non-contact measurement to avoid interference with the measured gas, making it particularly suitable for continuous monitoring in complex and harsh environments.
2、 Guide to the entire process of instrument operation
1. Pre operation inspection and preparation
Security check is the first step. Ensure good ventilation in the work environment, no obvious vibration, and wear personal protective equipment according to regulations. Observe the appearance of the equipment, confirm that all components are intact, the interfaces are clean, and the power connection is stable.
Equipment inspection is crucial. After connecting the power, the instrument will perform a power on self-test. During this period, please pay attention to the display screen for any abnormal prompts to ensure that the device is in normal working condition before proceeding with subsequent operations.
2. Parameter setting and calibration
Parameter settings directly affect the accuracy of measurement results. Firstly, the appropriate laser wavelength should be selected based on the type of gas being tested, as different gases have different absorption characteristics for laser. Secondly, it is necessary to set a reasonable scanning range based on the estimated gas concentration, which can optimize measurement accuracy and response speed. In addition, parameters such as sampling time and measurement cycle also need to be set according to actual needs.
Calibration is the lifeline to ensure accurate data. Before use, zero calibration must be performed according to the instructions. For instruments that run for a long time, the sensors will gradually age and sensitivity will decrease, so it is necessary to calibrate them regularly using standard gases. It is generally recommended that the calibration cycle should not exceed six months.
3. Sample collection and analysis
Sample collection should ensure representativeness. Choose a suitable sampling device to ensure good sealing and avoid gas pollution. During the sampling process, it is important to control the sampling time and amount to ensure that the collected gas sample accurately reflects the condition of the gas source being tested.
When starting the analysis, place the gas sample smoothly into the sample chamber of the instrument to ensure sealing. After starting the analysis program, the instrument will automatically complete spectral scanning and data processing. At this time, the operator should be located upwind and pay attention to observing changes in air pressure to ensure personal safety and data reliability.
3、 Key usage techniques and precautions for extraction laser gas analyzer
Handle with care, shock resistant and anti-collision: The sensors and optical components inside the instrument are very precise, and strong vibrations or impacts can affect measurement accuracy and even cause damage. Be sure to handle with care during the transportation process.
Keep clean and avoid contamination: During use, it is necessary to strictly prevent oil stains, corrosive substances, condensed water, high-pressure gases, or impurities from entering the instrument. After each use, the surface of the instrument and the optical system should be cleaned promptly and stored in a dry, dust-free environment.
Ensure unobstructed optical path: During the measurement process, it is necessary to keep the laser optical path unobstructed and avoid any obstruction or reflection interference with the optical path, otherwise it will seriously affect the measurement results.
Professional maintenance, no unauthorized disassembly: Non professional maintenance personnel are strictly prohibited from disassembling instrument parts without authorization. If there are data abnormalities or equipment failures, the use should be stopped immediately and professional personnel should be contacted for maintenance.
4、 Overview of Application Scenarios
The application range of laser gas analyzer is extremely wide, making it a versatile tool.
Environmental monitoring: Real time monitoring of pollutants such as sulfur dioxide (SO ₂), nitrogen oxides (NOx), volatile organic compounds (VOCs) in the atmosphere, providing data support for environmental decision-making.
Industrial safety: In the fields of petrochemicals, coal mines, etc., monitoring the concentration of flammable and explosive gases (such as methane) or toxic gases (such as hydrogen sulfide) to prevent safety accidents.
Process control: In industries such as metallurgy and power, monitoring the oxygen and carbon dioxide content in boiler flue gas or process gas optimizes combustion efficiency and improves product quality.
Medical and scientific research: used for respiratory analysis, laboratory gas detection, etc. Its high precision and non-invasive characteristics make it an ideal tool.
5、 Key points for daily maintenance and upkeep
Regular maintenance can significantly extend the service life of equipment and ensure its long-term stability.
Regular calibration: As mentioned earlier, establish and implement a strict regular calibration plan.
Cleaning and inspection: Regularly clean the optical window, check whether the air interface is loose or leaking, and ensure the cleanliness and smoothness of the sampling system.
Long term disuse: If the instrument is not used for a long time, the power switch should be turned off and it should be stored in a designated environment.
Record and Training: Establish maintenance logs to document each calibration, maintenance, and identified issues. Operators should receive professional training to continuously improve their operational skills and fault identification abilities.
Conclusion
Mastering the usage skills of extraction laser gas analyzer can not only fully utilize its "precision eye" performance, provide reliable data guarantee for production, environmental protection and safety, but also effectively reduce the failure rate and save operating costs. I hope this article can help you use this powerful tool more confidently and safely.