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Brand: Donaldson
Donaldson P-SLF 0288-3072 Sterile Air Unit
Description
A mobile sterile air unit with blower and steam-sterilisable filter, to 900 m3/h
The Donaldson P-SLF is a self-contained sterile air unit that cleans ambient air with a pre-filter and a sterile filter driven by a low-pressure blower. It is used to supply sterile air to storage tanks, mixing tanks and filling machines, where a constant exchange of the air cushion at a slight overpressure prevents growth of bacteria, viruses and phages. Eight sizes cover 30 to 900 m3/h, and the unit comes in a mobile or a stationary version.
The sterile chamber and filter elements can be sanitised with saturated steam. A PN 4 version allows sterilisation with steam up to 4 bar or 140 C, named for example P-SLF 0576-4. Food and beverage, dairy, pharmaceutical, chemical and cosmetic plants are the target industries.
Technical specifications
| Parameter | Specification |
|---|---|
| Series | P-SLF 0288-0 to 3072-0 (eight sizes) |
| Capacity | 30 to 900 m3/h, depending on size and pressure drop |
| Blower overpressure | About 0.1 bar |
| Intake air | Dry ambient air, relative humidity below 95 percent |
| Sterilisation | Saturated steam; PN 4 version to 4 bar / 140 C |
| Elements | Sterile filter elements plus a P-GS steam filter element |
| Power supply | 220/380 V, 50 Hz (0288-0 to 1152-0); 380/660 V, 50 Hz (1536-0 to 3072-0) |
| Versions | Mobile or stationary; -0 standard and -4 PN 4 |
| Protection | Vacuum relief valve and pressure relief valve |
| Document | Rev01, 07/10 |
Sizes
- 0288-0: m3/h at 100 mbar 75; m3/h at 200 mbar 35; Power kW 0.85
- 0576-0: m3/h at 100 mbar 210; m3/h at 200 mbar 110; Power kW 2.2
- 1152-0: m3/h at 100 mbar 410; m3/h at 200 mbar 300; Power kW 4.0
- 1536-0: m3/h at 100 mbar 450; m3/h at 200 mbar 390; Power kW 7.5
- 3072-0: m3/h at 100 mbar 900; m3/h at 200 mbar 790; Power kW 13
Selected sizes of eight. The capacity is quoted at two pressure differences, and the 0288 type is limited to a maximum total difference of 0.17 bar at the blower.
How it works
The blower draws ambient air through the intake into a chamber with a pre-filter on the upstream side. A vacuum relief valve protects the blower as the pre-filter loads. The blower compresses the air by about 0.1 bar and feeds it into the sterile chamber, where the sterile filter retains micro-organisms. During sterilisation a disc valve closes to keep steam out of the blower, and a steam filter is standard on every unit.
Sizes use between two and sixteen sterile elements of the 20/30 or 30/30 type, plus a smaller P-GS steam filter element. Choose the unit by the air volume of the tank or the process and the allowed pressure drop. The sheet is dated 07/10, so confirm the current version with the manufacturer, and state voltage and frequency when you order. Other voltages and frequencies are available on request according to the sheet.
Documents and quotation
Quote requests for P-SLF 0288-3072 start from this page. Check the size, voltage and steam sterilisation pressure in the attached Donaldson P-SLF sterile air unit data sheet (Rev01 07/10) before you send the form. See also Filtration Systems.
Datasheets & Documents
- Datasheet Donaldson P-SLF sterile air unit data sheet (Rev01 07/10) Download
Reviews (0)
About brand
Donaldson is the American filtration company founded in Minnesota in 1915. It started when Frank Donaldson Sr. built an air cleaner for a tractor engine that kept failing in dusty fields. It is now headquartered in Bloomington, Minnesota, and makes filters and filtration systems for engines, hydraulics, compressed air and gases, dust collection and process liquids.
Seven Star LLC is an independent supplier in Muscat. We list Donaldson compressed air dryers and filters, gas filter housings, activated carbon adsorbers, hydraulic and fuel filtration and dust collectors, and supply them and their replacement elements in Oman and the GCC.
Donaldson company profile
| Established | 1915, Minnesota, USA, by Frank Donaldson Sr. and his family |
|---|---|
| First product | An air cleaner for tractor engines |
| Headquarters | Bloomington, Minnesota |
| Product families | Engine air and fuel filters, hydraulic and lube filters, compressed air and gas filters and dryers, dust collectors, process and sterile filtration |
Milestones
- 1915: Frank Donaldson Sr. builds an air cleaner for a tractor that kept failing in a dusty field; the family starts Donaldson Company in Minnesota.
- 1917: Air cleaners are supplied for artillery tractors.
- 1920s: Exhaust products are added after crop fires caused by engine sparks.
- 1974: Donaldson acquires Torit, the dust collector business.
- 2015: The company marks its 100th year.
Donaldson products we list
| Family | Models | Typical use |
|---|---|---|
| Compressed air filters and drains | DF Ultra-Filter, DF-T three-stage, DF-C cyclone, UFM-P drain | Removing water, oil and particles from compressed air |
| Adsorption and refrigeration dryers | Ultrapac HL, HRE+, HRS+, HRS-L+, HLP, Buran, Bora, HRC-T hydrogen | Instrument air with a low dew point, high-pressure air and gas drying |
| Activated carbon and breathing air | Ultrasorp AKC, Ultrasorp Smart, Ultrapure ALG breathing air, A element, AK element | Removing oil vapour and odours for food, pharma and breathing air |
| Gas filter housings | EG (ATEX), HD high-pressure | Process gases and high-pressure gas filtration |
| Hydraulic and fuel filtration | FLK, HNK Duramax, filter cart, Filter Buddy, T.R.A.P. breather, P568583, P574958, AG1398001 skid | Cleaning hydraulic oil and bulk fuel and keeping moisture out of tanks |
| Dust collection | DCE 125 B bin vent | Silo and bin venting for cement, powders and bulk solids |
Compressed air quality is set by ISO 8573-1 classes for particles, water and oil. A typical instrument air system uses a coarse filter and a fine coalescing filter before the dryer, an adsorption dryer for a low pressure dew point (for example -40 °C), and a dust filter after it. An activated carbon stage removes oil vapour where the air touches food or is breathed. Heatless dryers use some of the dry air to regenerate the desiccant, while heat-regenerated and zero-purge types save that air on larger systems.
Where Donaldson products are used
In Oman and the GCC, Donaldson filters and dryers are used for instrument and plant air in oil and gas, refining, power and desalination plants, for breathing air, in food and pharmaceutical production, on hydraulic systems and fuel storage, and in cement and bulk handling.
Ordering Donaldson products: what we need
Send the model and size from the nameplate. For dryers and filters, add the flow (m³/h or scfm), working pressure, inlet temperature, required dew point or ISO 8573-1 class, and the supply voltage. For replacement elements, send the element part number or the housing model.
Facts checked against Donaldson company history, October 2026.
Browse Donaldson products by category: Compressors, Filter Housings, Filtration Systems, Filtration Elements.
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Frequently Asked Questions
What is the P-SLF used for?
To supply sterile air to tanks, mixing vessels and filling machines in food, beverage, pharmaceutical and chemical plants.
What flow range does it cover?
Eight sizes from 30 to 900 m3/h.
How is it sterilised?
With saturated steam; the PN 4 version allows steam up to 4 bar or 140 C.
What intake air does it need?
Dry ambient air with a relative humidity below 95 percent.
Is it mobile?
It is available in a mobile and a stationary version.
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