A mini centrifuge is a laboratory equipment that is used to separate samples based on their density and size. It is a compact and portable device that can fit on a benchtop or in a small space. Mini centrifuges are commonly used in molecular biology, biochemistry, and clinical laboratories for various applications such as DNA extraction, protein purification, and cell separation. They typically have a capacity of up to 2 mL and can spin at speeds of up to 15,000 rpm. Mini centrifuges are ideal for small-scale experiments and are often used in educational settings or for fieldwork. Mini Centrifuge,Mini Portable Centrifuge,Mini Centrifuge Machine,Mini Laboratory Centrifuge Lachoi Scientific Instrument (Shaoxing) Co., Ltd. , https://www.lachoinst.com
The hazy weather has significantly reduced visibility across the city, creating a dense and persistent fog. This phenomenon occurs when humidity is high in the early morning or late at night, leading to the formation of fog. As temperatures rise during the day and humidity decreases, the fog gradually dissipates into clear air. However, this weather pattern is not purely natural—it is influenced by both meteorological conditions and human-induced pollution. Since January 9, 2013, many parts of the country, especially the central and eastern regions, have experienced severe smog and pollution. The Central Meteorological Observatory upgraded its warning from blue to yellow, signaling the severity of the situation. On the 13th, Beijing issued its first-ever orange alert in the history of its meteorological system.
This widespread pollution spans from the northeast to the northwest, covering North China, the middle reaches, and extending to the Huanghuai and Jiangnan regions. Several factors contribute to the formation of such haze. First, low atmospheric pressure and stagnant air prevent the dispersion of pollutants, allowing tiny particles to accumulate in the atmosphere. Second, dust on the ground, combined with low humidity, is stirred up by human activities and vehicle traffic. Third, vehicle emissions are a major source of pollution, especially as the number of cars in cities continues to grow. Fourth, industrial factories produce secondary pollutants that add to the problem. Lastly, carbon dioxide and other emissions from winter heating contribute to the buildup of particulate matter in the air.
To monitor these pollutants, dust samplers are widely used. These devices utilize advanced microcomputer chip technology, featuring a high-energy cadmium-nickel rechargeable battery for long-lasting operation. They are user-friendly, accurate in timing, and durable, supporting both AC and DC power sources. With a countdown function ranging from 1 to 959 minutes, they offer flexibility in sampling duration. Once the set time is reached, the device automatically shuts down, ensuring efficient and safe operation.
Using a dust sampler involves a few simple steps. First, install the filter membrane on the sampling head. Then, press the ON/OFF button to start the device. The display will show “0:00,†and you can use the MIN key to select the desired time, with a maximum of 59 minutes. If more time is needed, press the HOUR key to extend the duration up to 15 hours. Once the time is set, press ON/OFF again to begin sampling. The pump will run while the timer counts down. When it reaches “0:00,†the device will automatically shut off after one minute. To stop early, hold the ON/OFF button for two seconds to reset or power down.
Charging the device is straightforward. Connect the AC power cord to a 220V outlet, and the instrument will charge for approximately 14 to 16 hours. A full charge allows for about four hours of continuous or cumulative use. The voltmeter shows the battery level—around 12V when fully charged. It's important to note that the device should not be used in explosive environments. Store it in a dry and well-ventilated area, and if not used for more than three months, recharge the battery to maintain its lifespan.
Before starting the machine, always ensure the sampling head with the filter membrane is properly installed. This prevents dust particles from entering the internal components, which could damage the air pump or clog the air circuit. During transport, handle the device carefully to avoid accidental presses on the microcomputer’s buttons, which may cause malfunctions.
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