A low speed centrifuge is a laboratory instrument that spins samples at a relatively low speed, typically between 1,000 and 10,000 rpm (revolutions per minute). This type of centrifuge is used for separating particles or components of a solution based on their size, density, or sedimentation rate. Low speed centrifuges are commonly used in medical and biological research, as well as in industrial applications such as the separation of oil and water. They are also used in clinical settings for the separation of blood components, such as red blood cells and plasma. Some common features of low speed centrifuges include a timer, temperature control, and various rotor options to accommodate different sample types and volumes. Low Speed Centrifuge,Plastic Desktop Centrifuge,Lab Centrifuge Machine,Centrifugate Oil Separator Lachoi Scientific Instrument (Shaoxing) Co., Ltd. , https://www.lachoinst.com
The city has been experiencing hazy weather, which has significantly reduced visibility over a large area. Fog typically forms when the relative humidity is high in the morning or at night, and as temperatures rise during the day, the moisture decreases, turning into mist or haze. This phenomenon results from both natural meteorological conditions and human-induced pollution. Since January 9, 2013, severe smog has affected central and eastern regions of the country, prompting the Central Meteorological Observatory to upgrade its warning level from blue to yellow. On the 13th, Beijing even issued its first-ever orange alert in the history of its meteorological system. The pollution spread across various regions, from the northeast to the northwest, and through North China, the Middle, the Huanghuai region, and Jiangnan, causing widespread air quality issues.
Haze formation is influenced by several factors. First, low atmospheric pressure and stagnant air prevent the dispersion of tiny particles in the atmosphere, allowing them to accumulate. Second, dust on the ground, combined with low humidity, leads to increased airborne particles due to traffic and human activity. Third, vehicle emissions are a major source of pollutants, especially with the growing number of cars in urban areas. Fourth, industrial activities contribute to secondary pollution. Lastly, carbon dioxide and other pollutants released during winter heating further worsen air quality by increasing the concentration of particulate matter in the air. In this context, the dust sampler plays an important role in monitoring and analyzing air quality.
Dust samplers use advanced microcomputer technology and come equipped with a high-capacity cadmium-nickel rechargeable battery, ensuring long operational time and ease of use. These devices offer accurate timing, durability, and compatibility with both AC and DC power sources. They allow users to set sampling times ranging from 1 to 959 minutes and automatically shut off after the selected duration. This makes them an efficient and practical tool for environmental monitoring.
To operate the dust sampler, first install the filter membrane on the sampling head. Then press the ON/OFF button to turn it on; the display will show “0:00.†Use the MIN key to select the desired time, up to 59 minutes, or the HOUR key for up to 15 hours. Once the time is set, press ON/OFF again to start the sampling process. The device will count down, and when it reaches “0:00,†it will automatically shut off. After one minute, the screen will go blank, and the power will be cut. If you need to stop early, press and hold the ON/OFF button for two seconds to reset or power off.
For charging, connect the AC power cord to the 220V input while the device is turned off. A full charge takes approximately 14 to 16 hours and allows the unit to run continuously for about four hours. The voltmeter shows the battery status during both sampling and charging, with a fully charged battery indicating around 12 volts.
It is important to note that the instrument 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 regularly to maintain its lifespan. Before starting the machine, always ensure the sampling head with the filter membrane is properly installed to avoid dust entering the internal components and damaging the pump or air circuit.
During transportation, handle the device carefully to prevent accidental presses on the microcomputer buttons, which could cause malfunctions.