Screens
The calculation of dew point is non-linear and complex. The standard utilizes Equations of State to model the behavior of the gas mixture. These mathematical models relate pressure, volume, and temperature. The standard may provide guidance on the convergence of pressure and temperature parameters to find the point where the vapor fraction equals 1.0 (saturated vapor).
Once you have legally obtained the document, follow this checklist to apply it correctly:
Disclaimer: This article is for informational purposes only. Prices, statuses, and standards are subject to change. Always consult ASTM International directly for the most current information.
ASTM D1142 provides the mathematical basis to predict this phenomenon before it happens.
If you're looking for a PDF copy of ASTM D1142, you can try the following sources:
A: Unlikely. The technical committee has made it clear that modern electronic methods are superior.
The standard gives repeatability (same operator, same lab) and reproducibility (different labs) limits. Typically, dew-point measurements were repeatable within ±1°C (1.8°F). Do not claim tighter precision than the standard allows.
