[Chinese instrument network instrument research and development] Speaking of air quality monitoring, most people will have a traditional impression in their minds - huge and heavy monitoring instruments, up to 20 hours of long-term sampling, one-by-one experimental analysis and data accounting, In the end, it got a smog index... But when the reporter interviewed Qingdao Haina Photoelectric Environmental Co., Ltd. in Qingdao High-tech Zone, Shandong, this traditional impression was completely overturned.
Handheld fog monitor
The company's R&D engineer Shao Xuyang showed reporters the second-generation hand-held PM2.5/PM10 online direct-reading monitor that they recently introduced. “This product is a new breakthrough for the previous haze index monitoring product. In the past the complex and cumbersome process can be achieved instantly with such a 0.5 kg, POS machine-sized device. It is like a flashlight and can be directly ' According to 'the PM2.5, PM10 value.' Shao Xu Yang said.
What's the magic of this handheld PM2.5/PM10 online direct reading monitor?
In response to a reporter's question, Shao Xuyang told the reporter with a set of comparisons: “The vast majority of instruments used for smog testing in the market use the 'gravimetry', and the so-called weight method is to install a filter membrane on the monitoring instrument. Before the filter was weighed, after sampling, particles in the air were attached to the filter, and then the filter was weighed. The difference obtained by subtraction was the weight of particles in the air, and the weight was divided by the volume. You can get the concentration of dust.†The working principle of this traditional monitoring instrument sounds simple, but it is actually inconvenient to operate. The first is that the sampling time is up to 20 hours, and the later monitoring data analysis can only be carried out in the laboratory. "We must be very cautious in these processes. Otherwise, a small oversight can directly lead to great errors in the data." Tools are huge, the process is cumbersome, and time lags behind... Shao Xuyang summarized the drawbacks of the traditional haze monitoring instruments.
“Because the traditional methods have drawbacks, we hope to overcome the constraints of traditional instruments in a completely new way. This alternative method is optical calculation.†Shao Xuyang introduced the instrument while introducing the reporter. "The so-called optical calculation method is to use laser scattering. The scattering of suspended particles in the air irradiated by laser light will produce scattering. At the same time, these scattered lights will be collected at a certain angle. Using a microprocessor, a series of algorithms can be used to derive particles. The equivalent particle size and the number of particles of different particle sizes within a unit volume, and then the mass concentration of particles of different particle sizes, that is, the so-called haze index." Shao Xu Yang said.
Speaking of the biggest technical breakthrough point of the product, Shao Xuyang said with pride: “Our handheld PM2.5 and PM10 monitors can directly read monitoring data. This is something that traditional instruments have never dared to think about. For one thing, smog monitoring doesn't have to wait for long-term data analysis in the lab, but rather 'stands by.'
In addition, Shao Xuyang stated that when the error of the monitoring data obtained by this instrument is less than 100 micrograms, it can be controlled within 15 micrograms, which is considered to be the highest level of accuracy of the current domestic-used smog monitoring instrument and it is equipped in the instrument. The print function can directly print the temperature, humidity, atmospheric pressure, PM2.5 and PM10 values ​​that are immediately monitored.
To verify the "power" of this hand-held fog monitor, Shao Xuyang took a piece of equipment and tested it on the laboratory site. After pressing the power button, first "K value setting", Shao Xu Yang said that in addition to very special circumstances, the general choice of the default value can be directly 1, and then click "start the test", open the page after setting "single time" " Monitoring times "interval", click "OK" to start testing.
Immediately afterwards, a set of data was displayed on the screen of the hand-held smog detector: the PM2.5 value was 53.9ug/m3, the PM10 value was 79.3ug/m3, and the air quality index was "good". “You see, the instrument also shows the ratio of PM2.5 to PM10. Through this ratio, you can determine who is the main pollutant in the air. If the ratio is greater than 1, PM2.5 is the main pollutant, if the ratio is less than 1, PM10 is the main pollutant, and the ratio of the two is now 0.67, which means that PM10 is the main pollutant in the current laboratory.†Shao Xuyang explained the results to the reporter and explained to the reporter.
The direct reading of data, ease of use, and high accuracy have made this handheld PM2.5/PM10 online direct-reading monitor highly popular and have been used by companies for air pollution testing in Qingdao. in. In overseas markets, this new product has also received special attention.
“A few days ago, Japan had a company that produced road dust suppression agents. They wanted to find an instrument that could monitor the performance of their products at any time. They found a lot of equipment manufacturers around the world, but only our one product fits perfectly. Their dual requirements for portability and accuracy are positive and encouraging for us. In the future, we will further increase the intelligence of the equipment and further optimize its performance,†said Shao Xuyang.
(Original title: Qingdao company invented the magic "flashlight" can directly "photograph" PM2.5)