Application of dust sampler in haze weather

Haze weather causes low visibility in a large area of the city. When the relative humidity is high in the morning or at night, fog is formed; 1n the daytime, when the temperature rises and the humidity drops, it gradually turns into haze. This phenomenon is caused by both meteorological factors and pollution emission. Since January 9, 2013, the Central Meteorological Observatory has upgraded the heavy fog blue warning to the yellow warning, and Beijing even issued the first haze orange warning in Beijing’s Meteorological History at 10:00 on January 13. From the northeast to the northwest, from North China to the central region, leading to heavy and serious pollution in a large range in the Huang Huai and Jiangnan regions< There are several reasons for the formation of haze. 1. Low atmospheric pressure and no flow of air are the main factors. Because the air does not flow, the tiny particles in the air gather and float in the air2. The dust on the ground is large, the air humidity is low, and the flow of people and cars on the ground stirs up the dust. 3. Vehicle exhaust is the main pollutant emission. 1n recent years, there are more and more vehicles in the city, and the emission of vehicle exhaust is a factor of haze. 4. Secondary pollution produced by factories. 5. The emission of CO2 and other pollutants from heating in winter can be summarized as the accumulation of dust particles in the air. When it comes to this, we have to lift the dust sampler the dust sampler adopts the latest microcomputer chip control technology, with built-in high-energy nickel cadmium rechargeable battery. 1t has the advantages of long continuous operation time, simple operation, high timing accuracy, durability, AC / DC compatibility, convenient timing, arbitrary selection of countdown 1 ~ 959 minutes, and automatic power off when shutdown. 1t is an ideal one among domestic similar instruments 1t is a practical dust sampler with filter membrane use and maintenance of dust sampler dust sampler sampling: install the sampling head with filter membrane, press the microcomputer on / off key, the display screen will show “0:00”, and then press min to select the required time, the maximum time of this key is 59 minutes, if 59 minutes is not enough, Press the hour key again. The maximum time of this key is 15 hours. When the time is selected, press the on / off key again to start sampling. When the sampling pump is working, the computer enters the countdown state. When the computer display screen shows “0:00”, the host computer will automatically cut off the power supply by the computer program. One minute later, the “0:00” character in the display screen will disappear, and the power supply in the computer will also be cut off. 1f you want to reset or shut down in advance, just press and hold the on / off key for 2 seconds to enter the reset or shut down mode, and the display will be “0:00” charging of dust sampler: insert the AC power cord into the 220 V AC input terminal of the instrument and the municipal power supply respectively. The instrument is in the off state, and it takes about 14 ~ 16 hours (standard charging time) to fully charge at one time. Each time the battery is fully charged, it can work continuously or cumulatively for about 4 hours. When sampling, the voltmeter indicates the battery voltage when sampling and when charging. The indication of fully charged voltmeter is about 12V main points: the instrument can not be used in explosion-proof situation. 1t should be placed in a ventilated and dry place for a long time. 1f it is not used for more than 3 months, it should be recharged to ensure the service life of high-energy Ni Cd battery in the air with more dust, the sampling head with filter membrane should be installed before starting the machine, otherwise the dust particles will enter the machine and affect the operation of the air pump and the cleaning of the air path in the process of carrying and carrying the instrument, other things should be prevented from touching and pressing the three buttons of the microcomputer, so as to avoid misoperation copyright notice: This article is reproduced from the network media, only represents the author’s point of view, and has nothing to do with this website. 1f the information column articles and comments violate your legal rights, please call to let us know and we will deal with them in time

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