First number
Particles
The class sets how many solid particles of each size a cubic metre of air may carry.
- Removed by
- Coalescing and dust filters
- On ULTRADRY
- Inlet and outlet filters
- After ULTRAK
- 1 µm dust filter
Ultra Controlo air treatment units take water, particles, oil and oil vapour out of compressed air: ULTRASEC and ULTRADRY dryers, ULTRAK activated carbon towers, the ULTRATECH breathing air purifier and the ULTRAMED medical air unit. They come from a Portuguese manufacturer of compressed air, vacuum and technical gas systems, with 40 years of experience.
ULTRADRY Adsorption dryer
ULTRASEC Refrigerated dryer
ULTRAK Carbon tower
Compressed air leaves the compressor with water vapour, particles and, from lubricated compressors, oil. Each unit takes out one of them; which ones you need depends on the quality the air must reach.
A coalescing filter takes out oil aerosol and particles. ULTRADRY has one at its inlet; ULTRAK needs one upstream.
ULTRASEC cools the air to a stable +3 °C pressure dew point and drains the condensate.
ULTRADRY adsorbs the water vapour, to a pressure dew point between −40 °C and −70 °C.
ULTRAK activated carbon takes oil vapour below 0.003 mg/m³.
ULTRATECH and ULTRAMED combine several stages in one unit, for breathable or medical air.
Sources: Ultra Controlo Industrial 2026 catalogue, pp. 17 and 19; ULTRADRY, ULTRAK, ULTRATECH and ULTRAMED datasheets.
Dryers, carbon towers and complete purifiers, each with its datasheet, its sizes and its spare parts.
An aluminium heat exchanger and a hot gas bypass valve keep the pressure dew point steady at +3 °C. Standard units take inlet air up to 70 °C, the ULTRASEC-HT up to 100 °C.
Twin towers take turns, for continuous operation, with a coalescing filter at the inlet, a dust filter at the outlet and the desiccant in cartridges that are easy to replace.
A bed of activated carbon separates oil vapour and other hydrocarbons from the air by adsorption, a dry separation. A coalescing filter goes upstream, and a 1 µm dust filter is recommended downstream.
Seven stages of filtration and adsorption make breathable air from the air of any type of compressor, with ULTRAGEST digital monitoring and control.
Medical air treatment in six stages, to the European Pharmacopoeia. It upgrades existing plants without a new control panel.
Tell us the compressor, the air flow, the working pressure and the quality the air must reach. We reply with the units that match.
Email the industrial teamFlow rates as the datasheets give them: ULTRADRY at a −40 °C pressure dew point, +35 °C inlet and 7 bar g; ULTRAK at 7 bar g and 20 °C; ULTRATECH nominal inlet flow; ULTRAMED at 7 bar and +35 °C inlet.
ISO 8573-1:2010 gives compressed air one purity class for particles, one for water and one for oil, written in that order, such as [2:4:2]. Tell us the three numbers your process needs and we propose the units for that class.
The class sets how many solid particles of each size a cubic metre of air may carry.
The class is set by the pressure dew point. For hospital technical air in Portugal, ACSS reads class 4 as a pressure dew point of +3 °C or lower, at 20 °C and 0.7 MPa.
The class sets the oil content: aerosol, liquid and vapour. ACSS reads class 2 as an oil content, vapour included, of 0.1 mg/m³ or lower, at ambient pressure.
Sources: ISO catalogue (ISO 8573-1:2010, current, confirmed in 2017); ACSS specification ET 08/2010 (V.2025), section 4.1.1; Ultra Controlo datasheets.
What changes is the quality the air must reach and the standard that sets it.
Moisture in compressed air can compromise tools, piping, valves, paint, packaging and the quality of the final product. ULTRASEC and ULTRADRY keep it out, and ULTRAK takes out oil vapour.
ULTRATECH makes breathable air from the air of any type of compressor, and ULTRAMED treats compressed air to the European Pharmacopoeia for medical air. For medical air, Ultra Controlo advises adding a sterile air filter.
A unit that takes contaminants out of compressed air after the compressor: water, particles, oil and oil vapour. Ultra Controlo makes refrigerated and adsorption dryers (ULTRASEC and ULTRADRY), activated carbon towers (ULTRAK) and complete purifiers for breathing air and medical air (ULTRATECH and ULTRAMED).
A refrigerated dryer cools the compressed air so that its moisture condenses and is drained; the ULTRASEC holds a pressure dew point of +3 °C. An adsorption dryer passes the air through a desiccant that adsorbs the water vapour; the ULTRADRY reaches −40 °C to −70 °C. Compare the two dryers.
No. The Compressed Air Challenge Fact Sheet #11 (May 2026) assigns lubricant and moisture to coalescing filters and vaporous contaminants to adsorbent filters. The ULTRAK activated carbon tower removes oil vapour by adsorption, with a coalescing filter upstream.
The ISO standard that specifies purity classes of compressed air for particles, water and oil. ISO lists the 2010 edition as current, last confirmed in 2017 and to be revised. A quality is written as three class numbers, one for each contaminant, such as [2:4:2].
Yes. The ULTRATECH datasheet says it produces breathable air from air that comes from any type of compressor, through seven stages of filtration and adsorption.
ULTRAMED: medical air treatment in six stages, to the European Pharmacopoeia. For medical air, Ultra Controlo advises adding a sterile air filter. See medical air systems.
For the air flow, the working pressure and the inlet temperature in the worst case: the US Department of Energy sourcebook (2016) says an increase in inlet temperature reduces a dryer’s rated capacity. Send us these values and the air quality you need, and we reply with the units and sizes that fit.
Send the compressor, the air flow, the pressure and the ISO 8573-1 class or the use. We reply with the units that fit and their price.