Structure and use of negative pressure weighing chamber

A weighing hood also called a weighing room, mainly includes negative pressure weighing hood and an activated carbon weighing hood. Negative pressure weighing hood is mainly used for local purification equipment for pharmaceutical, microbial research, and scientific experiments. The measuring hood is mainly used for the local purification equipment dedicated to the weighing of activated carbon in the water needle workshop. The weighing hood can provide a vertical one-way airflow, part of the clean air circulates in the working area, and part of it is discharged to the nearby area to generate negative pressure in the working area. , to prevent cross-contamination, it can control the dust and dust in the work area not spread to the outside of the operation area, to ensure that the operator does not inhale the operated items, and ensure a high cleanliness environment in the work area.

The working principle of the weighing hood:

The air in the weighing room passes through the primary filter and the intermediate filter and is pressed into the static pressure box by the centrifugal fan. area, so as to form a highly clean working environment. The operating area of the central weighing hood is maintained in a negative pressure state and 10% of the circulating air is exhausted. The air in the central weighing chamber is self-circulated through a three-stage filtration system (a high-efficiency filter removes 99.99% of the particles ≥ 0.3 μm and all dust), and the design meets the requirements of the pharmaceutical factory GMP.

Weighing room use:

Dust and reagents can be weighed and packaged in the weighing hood equipment, which can control the spillage and rise of dust and reagents, prevent the inhalation hazards of dust and reagents to the human body, and also avoid cross-contamination of dust and reagents, and protect the external environment and indoor environment. personnel safety.

Weighing hood Weighing chamber structure:

The weighing hood is made of 304 stainless steel, and the wall panel of the working area is made of stainless steel 304 (1.2mm thick, oil-drawn short wire, and the inner arc angle of the wall panel is connected without dead angle, which ensures the sealing and neatness of the working area.

The negative pressure weighing hood adopts a modular design, which is easy to assemble and disassemble on-site. It is composed of junior high school effect + fan box high-efficiency filter + flow-equalizing membrane.

Weighing hood The weighing chamber is assembled from the working area, the return air box, the fan box, the air outlet, and the outer box. The control panel is located in the front of the inner working area of the equipment. The control panel adopts the Siemens touchscreen inverter control system, which can control the start and stop of the fan, adjust the frequency of the fan, and adjust the wind speed required by the working area (after the equipment is installed and used, the frequency needs to be changed by special personnel). It also displays the pressure difference, wind speed, temperature, and humidity of the primary filter, the medium efficiency filter, the high-efficiency filter, and the flow equalizing membrane and also configures a dust particle monitoring system to monitor the dynamic cleanliness in real-time, which serves as a cleanliness reference. Alarm for abnormal wind speed, pressure difference, cleanliness, etc. Differential pressure gauges are used to measure the pressure of the filter at different times, providing a lasting indication of the performance of the weighing hood. The initial effect needs to be cleaned regularly according to the usage. There are four differential pressure sensors installed in the return air channel, corresponding to the resistance of the particular flow equalizing membrane, primary, middle, and high-efficiency filters, and displayed on the touch screen. When the pressure difference of the filter exceeds the range, an alarm will be displayed on the touch screen, and there will be a sound alarm on the automatic control box.

Wuxi Lenge Purification Equipments Co., Ltd. is a professional manufacturer of purification equipment, we have a variety of microporous membranes for you to choose from. Suitable for pharmaceuticals, laboratories, food and beverage, electronics, etc. We also have stainless steel furniture. If you are interested in purification equipment and stainless steel furniture, please contact us! You can contact us at 86-510-85189266. Or send an email to export@wxljjh.com.