Panametrics Aurora H2O, User Manual

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Aurora H2O User’s Manual 9
Chapter 4. Programming Advanced Features
4.3.4 Setting the Dew Point Calculation Method
• The dew point is the temperature at which the air is saturated with respect to water vapor over a liquid surface.
• The frost point is the temperature at which the air is saturated with respect to water vapor over an ice surface.
There can be a difference of several degrees C between the dew point and the frost point.
• When set for Dew/Frost , the Aurora H2O will report the Dew Point if the reading is above freezing, and will report
the Frost Point if the reading is below freezing.
• When set for Dew Point , the Aurora H2O will calculate the Dew Point temperature, even if that temperature is
below freezing.
To set the dew point calculation method, from the User Adjustments Menu select Dew Pt
Calc and press Enter . The following screen appears.
From the Select Calc Options Menu select Dew/Frost and press Enter . The following screen
appears.
Use the arrow keys to highlight the desired dew point setting and press
Enter
. The
screen returns to the User Adjustments Menu.
• The Dew calculation should be used for compatibility with ASTM-1142/IGT-8. The tables and calculations in
those reports require measurements and provide results in dew point, regardless of the actual phase (dew or
frost).
• The Dew/Frost calculation should be used for compatibility with ISO-18453:2004, or when using a chilled mirror
apparatus as a check standard.