Omega Air HF high-pressure compressed air filters up to 50 bar
HF filters from the Slovenian manufacturer Omega Air remove solid contaminants, water, oil, oil vapours and odours from compressed air at pressures up to 50 bar. The housing is cast aluminium and is connected to the air line by female pipe threads.
The range has 9 sizes with G 1/2" to G 3" threads and flows of 1,183 to 46,000 l/min at 7 bar. The housing holds a single element — the element determines the filtration stage. The range is one of the Omega Air industrial filters.
Filtration stages and accessories
Each tile leads to a stage with a table of sizes, spare elements and flows.
HFC cyclone separators
They separate liquid water and condensate before the filters, also up to 50 bar.
Filtration stages at a glance
The ISO 8573-1 class is written as solid particles – water – oil.
| HF filtration stages | |||||
|---|---|---|---|---|---|
| Stage | Filtration rating | ISO 8573-1 class | Residual oil | Element replacement | Temperature up to |
| HFB coarse filter 15 µm | 15 µm | 7-x-x | – | once a year or at 350 mbar | +65 °C |
| HFP basic filter 3 µm | 3 µm | 6-x-x | – | once a year or at 350 mbar | +65 °C |
| HFR dust filter 1 µm | 1 µm | 3-x-x | – | once a year or at 350 mbar | +65 °C |
| HFM fine pre-filter 0.1 µm | 0.1 µm | 2-x-2 | < 0.1 mg/m³ | once a year or at 350 mbar | +65 °C |
| HFS microfilter 0.01 µm | 0.01 µm | 1-x-1 | < 0.01 mg/m³ | once a year or at 350 mbar | +65 °C |
| HFA activated carbon | – | 1-x-1 | < 0.005 mg/m³ | every 6 months | +45 °C |
Solid particle class 1 for activated carbon A only applies when an S microfilter is installed before it. Elements B to S are replaced at least once a year or at a pressure drop of 350 mbar, activated carbon elements every 6 months.
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How to read the ISO 8573-1 purity class
The ISO 8573-1 standard describes the purity of compressed air with three numbers: solid particles, water and oil. The lower the number, the cleaner the air. The letter x means that the filter does not determine that component.
The HFS microfilter with class 1-x-1 thus ensures the highest purity for solid particles and oil, but it does not deal with humidity. Filters only trap water that has already condensed. Water vapour is removed by a compressed air dryer.
How to put the filtration together
The stages are arranged from coarse to fine in the direction of flow: coarse filter B, basic P, dust R, fine pre-filter M, microfilter S and finally activated carbon A. Each stage protects the finer stages after it, so their elements last longer.
The fine pre-filter M goes before the microfilter S. An S microfilter always goes before activated carbon — only with it does solid particle class 1 apply and the activated carbon does not receive oil droplets; it must not work in an oil-saturated environment.
The R dust filter is also suitable after an adsorption dryer, where it traps dust from the adsorbent.
Filter sizes
The size determines the thread, the flow and the length of the bowl. All stages of the same size have the same housing, thread and flow; only the element differs.
The smallest filters, 007 to 018, are 250 mm tall and weigh 2.1 kg; the largest, 240, is 1,010 mm tall and weighs 34.9 kg. You will find the dimensions of each size on the product page of the filter.
| HF filter sizes | ||||||
|---|---|---|---|---|---|---|
| Size | Thread | Nm³/h at 7 bar | l/min at 7 bar | Height A | Weight | Volume |
| 007 | G 1/2" | 71 | 1,183 | 250 mm | 2.1 kg | 0.8 l |
| 010 | G 3/4" | 112 | 1,867 | 250 mm | 2.1 kg | 0.8 l |
| 018 | G 1" | 204 | 3,400 | 250 mm | 2.1 kg | 0.8 l |
| 047 | G 1 1/2" | 282 | 4,700 | 535 mm | 9.5 kg | 3.7 l |
| 070 | G 1 1/2" | 400 | 6,667 | 535 mm | 9.5 kg | 3.7 l |
| 094 | G 2" | 494 | 8,233 | 715 mm | 12.2 kg | 5.2 l |
| 150 | G 2" | 799 | 13,317 | 715 mm | 12.2 kg | 5.2 l |
| 200 | G 3" | 2,160 | 36,000 | – | 30.4 kg | 16.7 l |
| 240 | G 3" | 2,760 | 46,000 | 1,010 mm | 34.9 kg | 19.8 l |
The manufacturer’s and the supplier’s data sheets give different heights for size 200, so we do not state it. The volume is the internal volume of the housing.
Flow at a higher pressure
The flows apply to a pressure of 7 bar and a temperature of +20 °C. At a different pressure, multiply the flow by the correction factor: at a higher pressure the filter passes more air, at a lower pressure less.
Example: the HFS-007 has a flow of 1,183 l/min at 7 bar, 1,183 × 3.88 = 4,590 l/min at 30 bar and 7,548 l/min at 50 bar.
| Flow correction factor by pressure | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pressure (bar) | 3 | 5 | 7 | 10 | 13 | 16 | 20 | 30 | 40 | 50 |
| Factor | 0.50 | 0.75 | 1.00 | 1.38 | 1.75 | 2.13 | 2.63 | 3.88 | 5.13 | 6.38 |
Housing and dimensions
The housing is cast aluminium with a powder coating, the head cover is ABS and the seals are NBR. The air is connected through female pipe threads in the filter head; the condensate leaves at the bottom through a G 1/2" thread.
The product page of each filter gives the height A, the head width B, the distance C from the top edge to the connection axis and the clearance D needed below the filter.
Condensate drains and clogging indication
HF filters are supplied without a condensate drain; it is ordered separately. For pressures up to 50 bar, the AOK 50B brass and AOK 50SS stainless steel float drains are suitable; they work reliably from 10 bar. The drain must withstand the highest pressure in the air line. You will find more among the condensate drains for filters.
When to replace the element is shown by the MDHI 50 differential pressure gauge: it is mounted on the filter head, measures a pressure drop of 0 to 1 bar and withstands a static pressure of 50 bar. Elements B to S are replaced at a pressure drop of 350 mbar.
Other filters
For pressures up to 16 bar, there are Omega Air AAF threaded filters, and for large flows BF flanged filters. Liquid water before HF filters is separated by HFC cyclone separators. You will find the whole range among the industrial compressed air filters.
Ventilek’s tip
A microfilter needs a fine pre-filter. Install the HFM fine pre-filter before the HFS microfilter: it traps particles and oil down to 0.1 µm, and the microfilter element after it then only deals with the finest particles.
- Which filtration stage do I need?
- It depends on the ISO 8573-1 purity class you require. Coarse contaminants are trapped by B (class 7), basic filtration is provided by P (class 6), dust by R (class 3), fine particles and oil by the fine pre-filter M (2-x-2) and the microfilter S (1-x-1). Oil vapours and odours are removed by activated carbon A.
- How do I choose the size?
- By the flow at your pressure. The flows in the table apply to 7 bar; at a different pressure, multiply them by the correction factor — at 50 bar it is 6.38.
- How often should the elements be replaced?
- Elements B to S at least once a year or at a pressure drop of 350 mbar, activated carbon elements every 6 months.
- Is a condensate drain included with the filter?
- No. The filter is supplied with an element; the condensate drain is ordered separately. For pressures up to 50 bar, the AOK 50B or AOK 50SS is suitable.
- What pressure and temperature can the filters withstand?
- Working pressure up to 50 bar. Temperature +1.5 to +65 °C, for activated carbon A up to +45 °C.
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HFB coarse filters
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HFP basic filters
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HFR dust filters
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HFM fine pre-filters
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HFS microfilters
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HFA activated carbon
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Spare element HFR-018V for the HFR-018 dust filter with a G 1" thread. Recommended replacement at least once a year or at a pressure drop of 350 mbar.
Spare element HFS-018V for the HFS-018 microfilter with a G 1" thread. Recommended replacement at least once a year or at a pressure drop of 350 mbar.
With a G 3/4" thread and a flow of 1,867 l/min at 7 bar, the HFS-010 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³. Working...
With a G 1/2" thread and a flow of 1,183 l/min at 7 bar, the HFM-007 fine pre-filter traps fine solid particles larger than 0.1 µm, water and oil aerosol; residual oil is below...
With a G 1/2" thread and a flow of 1,183 l/min at 7 bar, the HFR-007 dust filter traps solid particles larger than 1 µm and liquid water. Working pressure up to 50 bar.
With a G 1/2" thread and a flow of 1,183 l/min at 7 bar, the HFS-007 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³. Working...
The MDHI 50 differential pressure gauge shows the pressure drop of the filter element on HF filters with pressures up to 50 bar. Range 0 to 1 bar, 2 × G 1/8" connection,...
Spare element HFR-007V for the HFR-007 dust filter with a G 1/2" thread. Recommended replacement at least once a year or at a pressure drop of 350 mbar.
Spare element HFS-007V for the HFS-007 microfilter with a G 1/2" thread. Recommended replacement at least once a year or at a pressure drop of 350 mbar.
Spare element HFM-007V for the HFM-007 fine pre-filter with a G 1/2" thread. Recommended replacement at least once a year or at a pressure drop of 350 mbar.
With a G 1/2" thread and a flow of 1,183 l/min at 7 bar, the HFA-007 activated carbon filter removes residual oil, oil vapours, hydrocarbons and odours; residual oil is below...
With a G 3/4" thread and a flow of 1,867 l/min at 7 bar, the HFA-010 activated carbon filter removes residual oil, oil vapours, hydrocarbons and odours; residual oil is below...
With a G 1" thread and a flow of 3,400 l/min at 7 bar, the HFA-018 activated carbon filter removes residual oil, oil vapours, hydrocarbons and odours; residual oil is below...
With a G 1 1/2" thread and a flow of 4,700 l/min at 7 bar, the HFA-047 activated carbon filter removes residual oil, oil vapours, hydrocarbons and odours; residual oil is below...
With a G 1 1/2" thread and a flow of 6,667 l/min at 7 bar, the HFA-070 activated carbon filter removes residual oil, oil vapours, hydrocarbons and odours; residual oil is below...
With a G 2" thread and a flow of 8,233 l/min at 7 bar, the HFA-094 activated carbon filter removes residual oil, oil vapours, hydrocarbons and odours; residual oil is below...
With a G 2" thread and a flow of 13,317 l/min at 7 bar, the HFA-150 activated carbon filter removes residual oil, oil vapours, hydrocarbons and odours; residual oil is below...
With a G 3" thread and a flow of 36,000 l/min at 7 bar, the HFA-200 activated carbon filter removes residual oil, oil vapours, hydrocarbons and odours; residual oil is below...
With a G 3" thread and a flow of 46,000 l/min at 7 bar, the HFA-240 activated carbon filter removes residual oil, oil vapours, hydrocarbons and odours; residual oil is below...
With a G 1/2" thread and a flow of 1,183 l/min at 7 bar, the HFP-007 basic filter traps solid contaminants larger than 3 µm and liquid water. Working pressure up to 50 bar.
With a G 3/4" thread and a flow of 1,867 l/min at 7 bar, the HFP-010 basic filter traps solid contaminants larger than 3 µm and liquid water. Working pressure up to 50 bar.
With a G 1" thread and a flow of 3,400 l/min at 7 bar, the HFP-018 basic filter traps solid contaminants larger than 3 µm and liquid water. Working pressure up to 50 bar.
With a G 1 1/2" thread and a flow of 4,700 l/min at 7 bar, the HFP-047 basic filter traps solid contaminants larger than 3 µm and liquid water. Working pressure up to 50 bar.
With a G 1 1/2" thread and a flow of 6,667 l/min at 7 bar, the HFP-070 basic filter traps solid contaminants larger than 3 µm and liquid water. Working pressure up to 50 bar.
With a G 2" thread and a flow of 8,233 l/min at 7 bar, the HFP-094 basic filter traps solid contaminants larger than 3 µm and liquid water. Working pressure up to 50 bar.
With a G 2" thread and a flow of 13,317 l/min at 7 bar, the HFP-150 basic filter traps solid contaminants larger than 3 µm and liquid water. Working pressure up to 50 bar.
With a G 3" thread and a flow of 36,000 l/min at 7 bar, the HFP-200 basic filter traps solid contaminants larger than 3 µm and liquid water. Working pressure up to 50 bar.
With a G 3" thread and a flow of 46,000 l/min at 7 bar, the HFP-240 basic filter traps solid contaminants larger than 3 µm and liquid water. Working pressure up to 50 bar.
With a G 1/2" thread and a flow of 1,183 l/min at 7 bar, the HFB-007 coarse filter traps coarse solid contaminants larger than 15 µm and protects the finer stages after it....
With a G 3/4" thread and a flow of 1,867 l/min at 7 bar, the HFB-010 coarse filter traps coarse solid contaminants larger than 15 µm and protects the finer stages after it....
With a G 1" thread and a flow of 3,400 l/min at 7 bar, the HFB-018 coarse filter traps coarse solid contaminants larger than 15 µm and protects the finer stages after it....
With a G 1 1/2" thread and a flow of 4,700 l/min at 7 bar, the HFB-047 coarse filter traps coarse solid contaminants larger than 15 µm and protects the finer stages after it....
With a G 1 1/2" thread and a flow of 6,667 l/min at 7 bar, the HFB-070 coarse filter traps coarse solid contaminants larger than 15 µm and protects the finer stages after it....
With a G 2" thread and a flow of 8,233 l/min at 7 bar, the HFB-094 coarse filter traps coarse solid contaminants larger than 15 µm and protects the finer stages after it....
With a G 2" thread and a flow of 13,317 l/min at 7 bar, the HFB-150 coarse filter traps coarse solid contaminants larger than 15 µm and protects the finer stages after it....
With a G 3" thread and a flow of 36,000 l/min at 7 bar, the HFB-200 coarse filter traps coarse solid contaminants larger than 15 µm and protects the finer stages after it....
With a G 3" thread and a flow of 46,000 l/min at 7 bar, the HFB-240 coarse filter traps coarse solid contaminants larger than 15 µm and protects the finer stages after it....
The MDHI 50-K differential pressure gauge shows the pressure drop of the filter element on HF filters with pressures up to 50 bar. Range 0 to 1 bar, 2 × G 1/8" connection,...
With a G 3/4" thread and a flow of 1,867 l/min at 7 bar, the HFR-010 dust filter traps solid particles larger than 1 µm and liquid water. Working pressure up to 50 bar.
With a G 1" thread and a flow of 3,400 l/min at 7 bar, the HFR-018 dust filter traps solid particles larger than 1 µm and liquid water. Working pressure up to 50 bar.