Micron to Dew Point Converter
Convert vacuum readings to moisture content and dew point
Vacuum Level Converter
1 micron = 1 μm Hg (micrometer of mercury)
Results
Dew Point Temperature
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Moisture Content
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Vacuum Quality
Pressure Unit Conversions
Torr
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mbar
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Pa
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in Hg
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Micron-Dew Point Reference Table
| Microns (μ) | Dew Point °C | Dew Point °F | Moisture (ppm) | Quality |
|---|---|---|---|---|
| 25,400 | 26.7 | 80 | 33,434 | 1" Hg - Not evacuated |
| 5,000 | 0.8 | 33.4 | 6,578 | Poor - Too much moisture |
| 2,500 | -8.9 | 16 | 3,289 | Marginal |
| 1,000 | -19.4 | -3 | 1,316 | Acceptable minimum |
| 500 | -28.9 | -20 | 658 | Good - Industry standard |
| 250 | -37.2 | -35 | 329 | Very Good - R-410A systems |
| 50 | -50.0 | -58 | 66 | Excellent - POE oil systems |
| 20 | -56.7 | -70 | 26 | Deep vacuum |
Target Vacuum Levels
- R-22 500 microns (minimum 1,000)
- R-410A 250-500 microns (POE oil is hygroscopic)
- R-32 250-500 microns
- R-454B 200-400 microns (A2L refrigerant)
- VRF/VRV 200 microns or better
Decay Test Guidelines
- After reaching target, isolate pump and wait 10-15 minutes
- Rise of <100 microns = system is tight
- Rise of 100-500 microns = check for moisture
- Rise of >500 microns = leak present
- Continuous slow rise indicates moisture outgassing
Important Notes
- • POE and PVE oils are highly hygroscopic - absorb moisture from air quickly
- • Never leave POE oil systems open to atmosphere longer than necessary
- • Digital micron gauges are more accurate than analog compound gauges
- • Vacuum pump oil should be changed regularly for best performance
- • Core removal tools significantly reduce evacuation time
- • Larger hoses (3/8" or 1/2") evacuate faster than standard 1/4" hoses