Dew point calculators are generally available. I find it hard to believe there are no charts or calculators that take temperature, pressure, flow rate, amount of water in the incoming air and so on to tell what dessicants will do. Seems that is true and nobody really knows what is coming out of their compressors unless they have just had an air test. How low of a dew point do the air test show? Do some of you get results back below -65F?
Hi BRT,
Over a month old post, but let me assist you.
No need air test, just buy a real dewpoint meter.
-65F is easy to achieve even for not a new 100% dry filter catridge, if it is a twin tower of :
First tower
677 Lawrence Factor. All 13x
August Industries - Filter Cartridge for MAKO PD-1503
2nd Tower
247 Lawrence Factor. 3 medias
August Industries - Filter Cartridge for MAKO PD-1803
-100F is when filter cartridges are very very new.
P5 is Bauer USA name for big twin tower of the size as seen on photo.
See -81 Farenheit is easy, even for not new filter cartridges
System belongs to my friend.
Note : air flow rate is between 200-400 liters a minute.
To read this dry, it takes hours of compressor running.
This is because the dew point sensor is so sensitive to changes when there is no air flow.
So after overnite shutdown, to get its true reading, at least run compressor for 1 hour or more.
Photo of reading is when compressor has done 3+ hours running filling tanks for customers.
This dew point sensor can read extremee minute moisture on pipes, high pressure seat of line valves, hoses and most importantly, I am sure the 13X when not under pressure will also release its water vapor....a tiny tiny bit.
See the chemical based humidty sensor. Its 20% is still super blue ( dry ).
At approx -52 to -53 Farenheit, the portion of 20% will start to loose its blue.
-52F at 163BAR is equal to 21.27% RH at 1 BAR/ATM.
Sorry, the wide photo became resized by system.
The text box wrote :
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Dewpoint sensor reads high pressure output of filter towers
-18.8 Celcius at 163 Bar is equal to -63.1C at 1 ATM/BAR.
-63.1C is -81.58 Farenheit
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Dive safe....
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