Air dryers – pressure dew point −25 °C
A pressure dew point of −25 °C protects an air line that runs through an unheated hall or outdoors in moderate frost: water does not condense until the temperature of the pipework drops below −15 °C.
It is achieved by desiccant dryers with a desiccant set for −25 °C. Compared with −40 °C, they handle a 10% higher flow rate.
Dryer selection calculator: based on the application, compressor output, pressure and temperatures, it selects suitable dryers from all ranges.
Dryers with a pressure dew point of −25 °C
The range links to a page with a table of all sizes. The flow rate applies to 7 bar and +35 °C at the inlet, converted to this dew point according to the manufacturer.
| Range | Type | Flow rate at 7 bar and this dew point | Pressure up to | Power supply |
|---|---|---|---|---|
| Omega Air ADRY | desiccant | 110–3 666 l/min | 16 bar | 230 V |
| Omega Air ADRY TAC with activated carbon tower | desiccant | 110–2 750 l/min | 16 bar | 230 V |
| Omega Air ADRY BM for breathing air | desiccant | 110–1 375 l/min | 16 bar | 230 V |
| Omega Air B-DRY and F-DRY | desiccant | 2 016–119 166 l/min | 16 bar | 230 V |
A dew point of −25 °C corresponds to water class 3 according to ISO 8573-1 (−20 °C or lower).
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How to choose between −25 and −40 °C
The dew point should be at least 10 °C lower than the coldest point of the air line. Down to −15 °C, −25 °C is enough; for harder frost, food and pharmaceuticals, choose −40 °C. MADRY membrane dryers achieve −20 °C at a lower flow rate.
Frequently asked questions
- Is −25 °C water class 3?
- Yes, class 3 according to ISO 8573-1 is a dew point of −20 °C or lower.
From our advice centre
Freezing of condensate in the air line
What to do when water freezes in the compressed air pipework in winter.
The compressed air drying process
A guide for technicians: dew point, types of dryers and how to connect them.
More dryer pages
By type: refrigeration · desiccant · membrane · activated carbon columns
By pressure dew point: +15 °C · +5 °C · +3 °C · −25 °C · −40 °C · −70 °C
All compressed air dryers with the selection calculator
Flow rates and correction factors are based on data from the manufacturers of the individual ranges.
Product sorting
List of products
Desiccant dryer ADRY-12 for 12 Nm³/h (200 l/min) of compressed air, G 3/8" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and outlet dust...
Desiccant dryer ADRY-150 for 150 Nm³/h (2,500 l/min) of compressed air, G 1" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and outlet...
Desiccant dryer ADRY-105 for 105 Nm³/h (1,750 l/min) of compressed air, G 3/4" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and outlet...
Desiccant dryer ADRY-60 for 60 Nm³/h (1,000 l/min) of compressed air, G 3/4" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and outlet...
FDRY-5000 desiccant dryer for 5,000 Nm³/h (83,333 l/min) of compressed air, DN100 connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and...
FDRY-1500 desiccant dryer for 1,500 Nm³/h (25,000 l/min) of compressed air, DN65 connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and...
FDRY-2500 desiccant dryer for 2,500 Nm³/h (41,667 l/min) of compressed air, DN80 connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and...
FDRY-3750 desiccant dryer for 3,750 Nm³/h (62,500 l/min) of compressed air, DN100 connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and...
BDRY-800 desiccant dryer for 770 Nm³/h (12,833 l/min) of compressed air, G 2" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and outlet...
BDRY-600 desiccant dryer for 590 Nm³/h (9,833 l/min) of compressed air, G 1 1/2" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and...
FDRY-2000 desiccant dryer for 2,000 Nm³/h (33,333 l/min) of compressed air, DN65 connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and...
BDRY-250 desiccant dryer for 260 Nm³/h (4,333 l/min) of compressed air, G 1" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and outlet...
BDRY-150 desiccant dryer for 150 Nm³/h (2,500 l/min) of compressed air, G 1" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and outlet...
BDRY-200 desiccant dryer for 200 Nm³/h (3,333 l/min) of compressed air, G 1" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and outlet...
FDRY-6500 desiccant dryer for 6,500 Nm³/h (108,333 l/min) of compressed air, DN125 connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and...
Desiccant dryer ADRY-TAC-06 with activated carbon tower for 6 Nm³/h (100 l/min), G 3/8" connection. Pressure dew point −40 °C, removal of oil vapours and odours, working...
Desiccant dryer ADRY-TAC-12 with activated carbon tower for 12 Nm³/h (200 l/min), G 3/8" connection. Pressure dew point −40 °C, removal of oil vapours and odours, working...
Desiccant dryer ADRY-TAC-24 with activated carbon tower for 24 Nm³/h (400 l/min), G 3/8" connection. Pressure dew point −40 °C, removal of oil vapours and odours, working...
Desiccant dryer ADRY-36 for 36 Nm³/h (600 l/min) of compressed air, G 3/8" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and outlet dust...
Desiccant dryer ADRY-24 for 24 Nm³/h (400 l/min) of compressed air, G 3/8" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and outlet dust...
Desiccant dryer ADRY-6 for 6 Nm³/h (100 l/min) of compressed air, G 3/8" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and outlet dust...
Desiccant dryer ADRY-200 for 200 Nm³/h (3,333 l/min) of compressed air, G 1" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and outlet...
Desiccant dryer ADRY-75 for 75 Nm³/h (1,250 l/min) of compressed air, G 3/4" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and outlet...
Desiccant dryer ADRY-BM-12 for drying and purifying compressed air for breathing, 12 Nm³/h (200 l/min), G 3/8" connection. Pressure dew point −40 °C, third column with special...
Desiccant dryer ADRY-BM-24 for drying and purifying compressed air for breathing, 24 Nm³/h (400 l/min), G 3/8" connection. Pressure dew point −40 °C, third column with special...
Desiccant dryer ADRY-BM-36 for drying and purifying compressed air for breathing, 36 Nm³/h (600 l/min), G 3/8" connection. Pressure dew point −40 °C, third column with special...
Desiccant dryer ADRY-BM-6 for drying and purifying compressed air for breathing, 6 Nm³/h (100 l/min), G 3/8" connection. Pressure dew point −40 °C, third column with special...
Desiccant dryer ADRY-BM-60 for drying and purifying compressed air for breathing, 60 Nm³/h (1,000 l/min), G 3/4" connection. Pressure dew point −40 °C, third column with special...
Desiccant dryer ADRY-BM-75 for drying and purifying compressed air for breathing, 75 Nm³/h (1,250 l/min), G 3/4" connection. Pressure dew point −40 °C, third column with special...
Desiccant dryer ADRY-TAC-105 with activated carbon tower for 105 Nm³/h (1,750 l/min), G 3/4" connection. Pressure dew point −40 °C, removal of oil vapours and odours, working...
Desiccant dryer ADRY-TAC-150 with activated carbon tower for 150 Nm³/h (2,500 l/min), G 1" connection. Pressure dew point −40 °C, removal of oil vapours and odours, working...
Desiccant dryer ADRY-TAC-36 with activated carbon tower for 36 Nm³/h (600 l/min), G 3/8" connection. Pressure dew point −40 °C, removal of oil vapours and odours, working...
Desiccant dryer ADRY-TAC-60 with activated carbon tower for 60 Nm³/h (1,000 l/min), G 3/4" connection. Pressure dew point −40 °C, removal of oil vapours and odours, working...
Desiccant dryer ADRY-TAC-75 with activated carbon tower for 75 Nm³/h (1,250 l/min), G 3/4" connection. Pressure dew point −40 °C, removal of oil vapours and odours, working...
BDRY-1000 desiccant dryer for 1,000 Nm³/h (16,667 l/min) of compressed air, G 2" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and...
BDRY-110 desiccant dryer for 110 Nm³/h (1,833 l/min) of compressed air, G 1" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and outlet...
BDRY-1200 desiccant dryer for 1,152 Nm³/h (19,200 l/min) of compressed air, G 2" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and...
BDRY-300 desiccant dryer for 320 Nm³/h (5,333 l/min) of compressed air, G 1 1/2" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and...
BDRY-400 desiccant dryer for 410 Nm³/h (6,833 l/min) of compressed air, G 1 1/2" connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and...
FDRY-1200 desiccant dryer for 1,200 Nm³/h (20,000 l/min) of compressed air, DN50 connection. Pressure dew point −40 °C, working pressure 4 to 16 bar, inlet microfilter and...