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Time：2025-06-23 15:21:04 Reading volume：
The mesh size of the oil purifier should be determined based on the type of filter medium, cleanliness requirements, and the type of equipment. The following is a specific guide:
Application scenarios Recommended mesh Corresponding filtration accuracy Applicable equipment
|-------------------------------------------------------|-----------------------------|-------------------------------------------|------------------------------------------|
| Industrial gear oil/hydraulic oil coarse filtration | 60-100 mesh | 250-150 microns | Plate and frame oil filter, centrifugal oil filter |
| Hydraulic system fine filtration | 150-200 mesh | 100-75 microns | Vacuum oil filter, pressure oil filter |
| Turbine oil/insulating oil high-precision filtration | 300-400 mesh | 50-38 microns | Precision oil filter, coalescence separation oil filter |
| Food-grade lubricating oil/medical oil | 500 mesh or more | ≤25 microns (up to 5 microns) | Stainless steel multi-layer filter oil filter |
1. Oil viscosity
- High viscosity oil (such as gear oil): ｓｅｌｅｃｔ a lower mesh number (60-150 mesh) to avoid excessive resistance.
- Low-viscosity oil (such as transformer oil): A high mesh number (200-400 mesh) can be used.
2. Pollution level (ISO 4406 standard)
- Pollution below NAS level 8: 100-200 mesh.
- NAS level 5 requirements: 300 mesh + (with filter paper or sintered filter element).
3. Equipment parameters
- Check the rated pressure of the oil filter, and the high mesh filter needs to match a higher pump pressure (such as a 10μm filter needs ≥0.3MPa).
Notes
1. Conversion between mesh number and micron:
- Mesh number × pore size (micron) ≈ 15000 (approximate value).
- Example: 100 mesh ≈ 150 microns, 200 mesh ≈ 75 microns.
2. Multi-layer filtration recommendations:
- Coarse filtration (100 mesh) → fine filtration (200 mesh) → ultra-fine filtration (400 mesh) step-by-step combination to extend the life of the filter element.
3. Replacement criteria:
- ｒｅｐｌａｃｅ when the pressure difference rises to twice the initial value.
- Immediately stop using the filter if the filter is visibly deformed or damaged.
- Turbine oil purification: Glass fiber filter elements with β ≥ 200 (equivalent to 300 mesh) are usually used.
- Cutting fluid recovery: Metal debris filtration requires a magnetic filter + 80 mesh stainless steel mesh combination.
- Edible oil filtration: Food-grade 316L stainless steel 400 mesh filter (FDA-compliant).
It is recommended to refer to the equipment manual or consult the manufacturer to determine the mesh size based on the specific oil contamination particle detection report (such as laser particle counting).
