Introduction of Negative Pressure Weighing Hood

The negative pressure weighing room is purification equipment designed for weighing raw and auxiliary materials, drying materials, or product sampling in the purification area. It is mainly used in places such as pharmaceuticals, microbiological research, and scientific experiments.

The function of negative pressure weighing hood:

Negative pressure weighing hood is purification equipment designed for weighing raw and auxiliary materials, drying materials, or product sampling in the purification area. It is mainly used in places such as pharmaceuticals, microbial research, and scientific experiments. The system is equipped with primary, intermediate, and high-efficiency filters, which provide a vertical unidirectional airflow to the weighing work area, which can effectively control dust flying. Most of the clean air circulates in the work area, and a small part of the clean air is discharged to the background area. , make the working area generate negative pressure relative to the background area, prevent cross-contamination, and protect the clean environment and the safety of indoor personnel.

The working principle of the negative pressure weighing hood:

This equipment adopts the airflow form of vertical unidirectional flow, and the return air must be pre-filtered through the primary filter to deal with the large particles of dust particles in the airflow. The pretreated air is then filtered twice through a medium-efficiency filter to fully protect the high-efficiency filter. Under the pressure provided by the centrifugal fan, it passes through the high-efficiency filter to make it meet the requirements of cleanliness. The clean airflow is sent to the air supply box, 90% of which passes through the air supply net plate to form a uniform vertical air supply airflow, and 10% passes through the air volume adjustment plate and is discharged from the equipment. All airflows are processed by high-efficiency filters, so the air supply and exhaust air are free of residual dust, avoiding secondary pollution. Due to the formation of a stable one-way flow in the working area, the dust emitted in this area will be captured by the primary and medium-efficiency filters along with the airflow under the influence of the one-way airflow. The equipment is equipped with 10% exhaust air, thus forming a negative pressure relative to the external environment, which ensures that the dust in this area will not spread to the outside to a certain extent, and plays a role in protecting the external environment.

Product advantages of negative pressure weighing hood:

•  The integrated arc design of the work area, has no dead corners, no dust accumulation, easy to clean.

•  Isolation by air curtain, convenient entry, and exit of personnel and materials, convenient operation, no sanitary dead corners.

• Differential pressure balance patented design

• The one-way flow pattern is good, the dust does not spread, and the dust capture effect is good.

• A cooling unit can be added to ensure that the temperature of the equipment is within the control range during operation.

• Combined with the company's testing methods, the filter level can be reasonably selected.

• The weighing equipment control is integrated into the equipment according to customer needs.
  

• Isolation methods include air curtain isolation, soft curtain isolation, and plexiglass isolation.
  

• The return air orifice is fixed by a strong magnet, which is easy to disassemble and assemble.

Features of negative pressure weighing hood:

1 The low negative pressure airflow through the subsidence type flows in the operation area, creating a clean and sterile local environment and avoiding cross-contamination between different drugs.

2. Effectively 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 safety of the external environment and indoor personnel

3 Primary, medium, and high-efficiency filters are three-stage filtrations, and the high-efficiency filter of the liquid tank meets the test requirements of DOP or PAO

4. The polymer flow uniform film significantly improves the uniformity of the air outlet.

Technical indicators of negative pressure weighing hood:

1. Air velocity is 0.45m/s±20%.

2. Equipped with the control system.

3. Wind speed sensor, temperature, and humidity sensor are optional.

4. The high-efficiency fan module provides clean laminar air (measured with 0.3µm particles) to meet cleanroom requirements with an efficiency of up to 99.995%.

5. Filter module:

Primary filter - plate filter G4;

Medium efficiency filter - bag filter F8;

High-efficiency filter - liquid tank high-efficiency non-partition filter H14.

6.380V power supply.

Wuxi Lenge Purification Equipment Co. Ltd. is a professional purification equipment manufacturer. Suitable for pharmaceuticals, laboratory food, beverages, etc. If you are interested in purification equipment, please feel free to contact us! You can call 86-510-85189266. Or send an email to export@wxljjh.com.