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Precautions for using a weighing hood (weighing chamber)

2023-12-27

The functions of a weighing hood are well-known, but sometimes there are side effects. A company, during its material weighing process under a weighing hood, weighed a batch of 80 kg of material in four 20 kg portions. After weighing, it was found that the total weight was 1 kg less. The electronic scale is very precise; it's hard to believe that it was a weighing error.

Later, upon inspection of the dust collection device's filter bag in the weighing hood, 0.7 kg of dust was found. It turned out that the weighing hood's air speed was quite high, and the company used large stainless steel basins for weighing. When the airflow hit the basins, it caused dust to rise, which was effectively captured by the dust removal device.

This dust collection device is amazing! Generally, dust collection exhaust ports are located below and behind the weighing table, Weighing table is perforated to ensure uniform air speed. However, when weighing materials, the basin obstructs the airflow. With high air speed, a large amount of dust is easily generated. Some companies even designed weighing hoods with a dust collection exhaust port above the weighing table, directly facing the material being weighed,

This allows for the shortest distance for dust capture. However, the airflow might be sucked away by the exhaust port before reaching the weighing table, causing turbulence or even vortices on the weighing table, leading to significant dust generation.

Therefore, the use of weighing hoods, the setting of dust removal devices, the air supply speed, the location of exhaust ports, and stable airflow patterns are all crucial.

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products cover the air purification equipment and services required by various industries, including the evaluation and detection of particulate matter (PM10, PM2.5, PM0.1), pathogens, gaseous molecular pollutants (TVOC, acidic and alkaline gases), etc., and provide comprehensive and effective air purification solutions.

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