Update: 2019-11-18 15:52 Source: LUFTMY
In recent years, with the continuous deterioration of air quality in China, especially in the northern region, the corresponding air purification products are heating up. As an important part of air purification products, dust sensors (also as dust sensors, particulate matter sensors) are widely used in air fresheners, air purifiers, air conditioners, ventilation equipment, environmental monitoring equipment, etc Products. Dust sensor has not come to the standard configuration of industrial products. In the past two years, both products and technologies have made rapid development. Dust sensor has developed from infrared scattering, passive air intake to infrared scattering, active air intake, from laser scattering self-contained fan, active air intake to laser scattering self-contained fan, active air intake differential calculation, then to laser scattering, air pump active air intake, Products have also formed different levels of low, medium and high-end, facing the terminal needs of different applications.
In 2014, with the rapid development of the industry, the number of suppliers began to increase, and some suppliers began to follow up the digital display and began to propose the localization of digital display. In 2015, the industry was sluggish, the technical strength and service of domestic brands were improved, but the market acceptance was still low. LD series of luftmy laser PM2.5 sensors, such as ld15, ld16, LD11, ld12, etc., have gained rapid momentum in the market share of particulate matter sensors in recent years with their superior price, excellent product performance and stable supply channels, enjoying excellent reputation and high influence in the industry.
The above is a simple market supply and demand situation. Let's take a look at the technical characteristics of PM2.5 sensor. 1. Digital display is the standard demand in the future. Products that cannot be digital display are not suitable for the market, and the output PM value of the sensor itself greatly reduces the research and development workload of the manufacturer; 2. The accuracy of the unit UG / m3 needs two aspects:
A. accurate counting and then quantitative to weight algorithm suitable for Chinese characteristics. The accurate counting is determined by the light source and air duct, and also related to the processing speed. The particle composition of PM2.5 determines the intermediate calculation method. If all of them are converted into pm1.0, the final result will be far from the national published weighing method.
B.the air volume of the stable air flow in unit time shall be accurate, and the absolute accuracy shall be subject to the outdoor data. The data of sampling points published to the State shall be consistent, and the range of 5% shall be consistent with 0 ~ 500ug / m3, which depends on the R & D and calibration of the manufacturer.
Air purification products will usher in a stable shuffling period after a few years of brutal growth. Manufacturers should select appropriate sensors according to their own positioning. Laser PM2.5 sensor represents the future trend of PM2.5 sensor.
1. Service life: the service life of the laser emission tube is thousands of hours, and there is also the possibility of sudden failure. About five thousandths, this is the characteristic of the laser sensor. You need to pay special attention to the service life. The life span of air pump or fan is longer than that of laser sensor. The life span of pump is only 2000 hours. The life span of fan depends on the design and material selection of sensor manufacturer;
2. Accuracy. The advantage of laser sensor is that it can detect more particles in the range of 0.3 ~ 1.0, and the relevant detection results are closer to the real value. Please do not use TSI for direct comparison between accurate and inaccurate results, and compare with the data of Meteorological Bureau. At the same time, recommend an app of "air quality index". Pay attention to find the data of the nearest national control point when comparing;
3. Consistency: take 100 sensors in a batch as an example, with an average value of 100ug / m3. To see the proportion of these 100 sensors deviating from 100ug, 10% is qualified, and 5% is excellent. It's convenient for people who don't know the truth to buy purifier products as a reference. It's also convenient for engineers of new fan manufacturers to choose infrared or laser dust sensors that are most suitable for their products according to their actual needs, because the choice is greater than the effort, the choice establishes the pattern, and the choice determines the success or failure.