2026-04-14Views：
Control Standard and Influencing Factors of Water Content in Compressed Air of Air Compressor
the water content in the compressed air passes through pressure dew point(Dew Point) measurement, the value of which depends on the post-processing equipment and environmental conditions. The following are key control criteria and influencing factors:
| Grade | pressure dew point(℃) | application Scenarios |
|---|---|---|
| Class 1 | ≤-40 | food direct contact, medicine clean room |
| Class 2 | ≤-20 | electronics Manufacturing, Laboratory |
| Class 3 | ≤-10 | spraying, general industrial |
| Class 4 | ≤ 7 | pneumatic tools, non-critical process |
example of conversion of water content:
under the dew point of 7 ℃, each cubic meter of compressed air contains about 5.6g of water.
At -40 ℃ dew point, the water content can be as low 0.001 g/m & sup3;(near zero liquid water).
freeze dryer dew point 3~5 ℃, suitable for general industry (such as pneumatic tool drive).
adsorption dryer: Dew point below -40 ℃, suitable for high cleanliness scenarios (such as food packaging, chip manufacturing).
inlet air humidity: In summer or humid areas (such as 80% relative humidity), the amount of condensed water will increase by 30%-50% after compression.
temperature fluctuation: The temperature difference between day and night of 10 ℃ can cause the displacement of the gas storage tank to change by ± 20%.
| Industry | requirement level | allowable water content | risk |
|---|---|---|---|
| food Filling | Class 1 | ≤ 0.001 g/m & sup3; | product recall due to oil/water contamination |
| spraying process | Class 3 | ≤0.5 g/m³ | paint defects caused by water mist |
| pneumatic tools | Class 4 | ≤5 g/m³ | corroded pneumatic components |
dew point meter calibration: Check once every quarter, and the error shall be controlled within ± 2 ℃.
Desiccant Replacement: The adsorption dryer replaces the desiccant (such as activated alumina) every 2-3 years.
Condensate water discharge: It is recommended to set an electronic timing valve (e. g. drain water every 15 minutes).
Conclusion: The water content of compressed air can be controlled by drying equipment 0.001~5 g/m³ depending on industry standards (ISO 8573-1) and post-processing configuration. In key scenarios such as food and medical care, it is necessary to combine oil-free air compressors and deep dryers, and strictly monitor the dew point to ensure process safety.
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