1ppm oil content it is a key indicator of compressed air quality control, with the following meanings:
definition Parsing
- ppm(parts per million): indicates ppm concentration, That is, the mass of oil particles contained in air per million unit volume.
- 1ppm: Equivalent 1 mg of oil per cubic meter of air, or about 0.035 mg of oil per cubic foot.
Industry background
- scenarios with high cleanliness requirements pharmaceutical (aseptic filling), electronics (chip manufacturing), food (aseptic packaging of dairy products) and other industries need to strictly control the oil content of compressed air to avoid contamination of products.
- International Standards: ISO 8573-1, grade 1 oil content standard is ≤ 0.01 mg/m & sup3;(about 0.001 ppm)1 ppm is already a high level of cleanliness.
conversion and comparison
- quality Conversion:
- 1 ppm = 1 mg/m³ = 1 g/km³
- 1 ppm & asynp; 0.035 mg/ft & sup3;(cubic feet)
- intuitive Contrast:
- human hair is about 50 microns in diameter, and 1 ppm oil content is equivalent to the oil content per cubic meter of air, which can cover about 0.2 hair cross-sectional area.
Detection method
- laser scattering method: The concentration is calculated by detecting the scattered light intensity of oil particles.
- infrared spectroscopy: Analyze the characteristic absorption peak of oil molecules with an accuracy of 0.001 ppm.
means of control
- multistage filtration: Activated carbon glass fiber filter element combination, which can be filtered to below 0.01 ppm.
- Oil-free air compressor: Using water lubrication or labyrinth seal technology to reduce oil content from the source.
Note: In actual engineering, 1 ppm oil content needs to be controlled with dew point (below -40 ℃) and particulate matter (ISO Class 1) to meet the complete cleanliness standards of pharmaceutical and other industries.
