Classification of coarse filters:The classification and application range of coarse filters provided by Guangzhou Zijing are reliable in quality and complete in specifications and sizes. Zijing not only has exquisite technology, but also has good after-sales service and high-quality solutions. You are welcome to call us for detailed information on the specific parameters and prices of this coarse filter product.
What are the benefits of a coarse filter? Coarse efficiency filter andPrimary FilterAny difference? People often call it a primary filter, is it a coarse filter or a primary filter? Sometimes I really can't figure it out. In fact, they are one product, just with different names. The main structural materials for the coarse filter are carbon steel, low-alloy steel, or stainless steel, denoted as C, M, and S respectively.

Scope of application of coarse filter:
Coarse efficiency filters are usually installed on pipelines at the inlet of pumps, compressors, or in front of flow meters.
1. Weakly corrosive materials in petrochemical production, such as water, ammonia, oil products, hydrocarbons, etc.
2. Corrosive materials in chemical production, such as caustic soda, soda ash, dilute sulfuric acid, carbonic acid, acetic acid, etc.
3. Low temperature materials in refrigeration, such as liquid methane, liquid ammonia, liquid oxygen, and various refrigerants.
4. Materials with hygiene requirements in light industrial food and pharmaceutical production, such as beer, beverages, dairy products, medical supplies, etc.

Key points for selecting coarse filter products:
1. The main control parameters for selecting coarse air filter products include rated air volume, filtration efficiency at rated air volume, initial resistance at rated air volume, dust holding capacity, and external dimensions.
2. According to the method specified in JG/T22-1999 "Performance Test Method for Air Filters for General Ventilation", the atmospheric dust counting efficiency for particles with a particle size of ≥ 5.0 μ m is ≥ 20%. 3. Common filter materials for coarse air filters include nylon weave, glass fiber, non-woven fabric, etc.
4. The manufacturer should provide the dust holding capacity of the filter.
5. The initial resistance of a coarse air filter should be ≤ 50Pa. During design, the final resistance can be calculated as twice the initial resistance of the filter.
6. The air filter should meet the fire prevention requirements, and the flash point of the coating of the air filter should not be lower than 163 ℃.
7. When the coarse air filter is used for central air conditioning, it adopts a washable and detachable type. The cleaning cycle is usually 3 to 6 months.

The series of coarse air filters are divided into eight levelsThey are: G1, G2, G3, G4, GN (nylon mesh filter), GH (metal mesh filter), GC (activated carbon filter), GT (high-temperature resistant primary efficiency filter),Bag type primary filter.

Coarse efficiency filter (also known as primary efficiency filter)Mainly used in the primary filtration section of clean rooms, coarse filters are mainly used to filter dust particles larger than 5 μ m and are widely used in industries such as optical electronics, medical pharmaceuticals, food and beverage, biological laboratories, touch screens, precision instruments, etc. They are generally used in conjunction with other air purification equipment, such as FFU、 Air shower room, clean room, etc. The outer frame material of the primary filter can be selected from stainless steel, paper frame, aluminum frame, galvanized frame, etc. The filter materials include non-woven fabric, nylon mesh, activated carbon filter material, metal mesh, etc. The protective mesh includes double-sided spray coated wire mesh and double-sided galvanized wire mesh, etc.

Standard for filtration efficiency of coarse filter35～ 95@5um Different coarse filters have different filtration efficiencies. A coarse filter refers to an air filtration device, which is generally used in clean workshops, cleanrooms, clean operating rooms, laboratories, and cleanrooms, or for dust prevention in electronic and mechanical communication equipment. Primary filters are widely used in other industries and departments that require compressed air purification, such as petroleum, chemical, metallurgical, power, machinery, light industry, textile, automobile manufacturing, electronics, food, medicine, biochemistry, national defense, scientific research, etc.
The standard filtration efficiency of the coarse filter is G1: 40% @ 5.0 μ m, G2: 65% @ 5.0 μ m, G3: 85% @ 5.0 μ m, G4: 90% @ 5.0 μ m (by weight method);

Specification, size, model and technical parameters of coarse filter：

Common specifications, dimensions, and technical parameters of G1 grade coarse efficiency filters:

Common specifications, dimensions, and technical parameters of G2 grade coarse efficiency filters:

Common specifications, dimensions, and technical parameters of G3 grade coarse efficiency filters:

G4 grade coarse filter specifications, dimensions, and technical parameters:

The specifications and dimensions of the coarse filter can be customized by customers according to non-standard requirements!

What is the difference between a coarse filter and a primary filter?
The coarse filter and the initial filter are the same, but there are more filters called initial filters. Coarse efficiency air filter refers to an air filtration device, generally used in clean workshops, cleanrooms, laboratories, and clean operating rooms.
Requirements for the use of air filters in dust-free workshops:
The requirements for air quality vary greatly among different factories. Factories equipped with exhaust hoods and pollution control equipment require a large amount of air to be replenished. If the ambient air in the area where these factories are located is polluted, the replenished air must be filtered before being distributed to the workplace.
In semiconductor production and pharmaceutical industry, there is a high demand for air cleanliness. In a typical working environment of a coarse air filter, there are 500000 particles per cubic foot of air, while the latest requirement for semiconductor production is only 1 particle per cubic foot of air. Therefore, the workspace needs to be continuously cleaned with clean air filtered through high-efficiency filters. To maintain the cleanliness and lifespan of HEPA air filters, it is necessary to use several low efficiency pre filters in combination.

Maintenance instructions for coarse filter:
1. The core part of a coarse filter is the filter element, which consists of a coarse filter frame and a stainless steel wire mesh. The stainless steel wire mesh is a vulnerable component and requires special protection;
2. After the coarse filter has been working for a period of time, a certain amount of impurities settle in the filter core. At this time, the pressure drop increases and the flow rate decreases. It is necessary to remove the impurities in the coarse filter core in a timely manner;
3. When cleaning impurities, special attention should be paid to ensure that the stainless steel wire mesh on the filter element is not deformed or damaged. Otherwise, if the filter is installed again, the purity of the filtered medium will not meet the design requirements, and equipment such as compressors, pumps, and instruments will be damaged;
4. If the stainless steel wire mesh is found to be deformed or damaged, it needs to be replaced immediately.

Requirements for after-sales service time of purification equipment:
Whether it is paid after-sales service or free after-sales service, customers provide feedback on equipment after-sales issues to Zijing. After our company provides a solution and the customer confirms the solution:
1. Arrive at the site within 24 hours within the Pearl River Delta and Yangtze River Delta to solve after-sales service problems;
2. In other areas, it is generally within 48 hours to arrive on-site to solve after-sales service problems, while in special remote areas, it is up to 96 hours to arrive on-site to solve after-sales service problems.