18
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WatchGas B.V.
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Klaverbaan 121,
2908KD, Capelle a/d IJssel, The Netherlands
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T: +31 (0) 85 0187709
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7.
Pressure Dewpoint
To establish pressure dewpoint, take the point where the water tube reading in mg/m3 intersects
system pressure and read off pressure dewpoint from vertical scale
NOTE
: Pressure dewpoint is the temperature at which free water is likely to occur at system pressure,
therefore this will be the minimum operating temperature of the system.
NOTE
: The above graph is for a guide only and can be used to estimate dewpoint from reasonably high
water level readings. These dewpoints are normally obtained in systems with little or no drying
capability. Refrigeration dryers normally produce dewpoints 3 oC at 7 bar g. For desiccant
systems dewpoints of better than -40 oC can be obtained and the above graph should not be for
calculating water at these low levels <250 mg/m3
