2026-04-20Views：
1ppm oil content corresponding to milligrams per cubic meter (mg/m & sup3;) The value should be calculated according to the molecular weight, temperature and pressure of the oil. The simplified formula under standard conditions (0 ℃, 101325Pa) is:
mg/m³=22.4M ×ppmamong them, M is the molar mass of the oil (g/mol). For example, if the molecular weight of the oil is 200g/mol, then a 1ppm oil content corresponds to about 8.93 mg/m & sup3;(calculation: 200 ÷ 22.4 & asynmp; 8.93).
temperature and pressure correction
under non-standard conditions (such as high temperature or high pressure), it needs to be adjusted by the general formula:
among them, T is temperature (℃), P is pressure (Pa). For example, at 25°C and normal pressure, if the molecular weight of the oil is 200g/mol,1ppm of oil content corresponds to about 8.2 mg/m & sup3;(calculation: 8.93 x 298273 & asynmp; 8.2).
The particularity of water lubricated air compressor
water lubricated air compressor through the water film instead of lubricating oil to achieve sealing and cooling, the theory of oil content is very low (usually ≤ 0.01ppm). To convert it to mg/m & sup3;, specify the molecular weight of the oil. For example, if the molecular weight of oil is 200g/mol, then 0.01ppm corresponds to about 0.000893 mg/m & sup3;(Calculation: 200 ÷ 22.4 × 0.01 & asynmp; 0.000893), far lower than the standard of conventional air compressor (e.g. oil content at outlet of micro-oil air compressor ≤ 0.01 mg/m & sup3;).
Comparison of industry standards
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