EP-CMW3.0-1.2 Oil-Free Scroll Air Compressor
The EP-CMW3.0-1.2 is the world’s first compact oil-free scroll air compressor rated to 1.2 MPa — producing 210 L/min of certified oil-free air at pressures that no other scroll compressor of this type could previously reach, opening applications in high-pressure instrumentation, specialty coating, and precision testing that previously had no clean air solution at this scale.
The Problem the EP-CMW3.0-1.2 Was Built to Solve
Before the EP-CMW3.0-1.2 existed, an engineer specifying oil-free compressed air at 1.2 MPa faced a practical dead end. Oil-free rotary screw compressors at this pressure tier are large, expensive, and require dedicated installation with complex dry-screw or water-injected maintenance programmes. High-pressure reciprocating compressors can reach 1.2 MPa but are loud, generate pulsation, and require oil separators and coalescing filters downstream that still cannot guarantee zero oil content. Booster compressors connected to a standard 0.8 MPa oil-free unit add complexity, introduce a second failure point, and still expose the downstream air to any contamination present in the booster's compression stages.
The result was a gap: applications genuinely requiring 1.2 MPa oil-free air at modest volumes -- specialty spray equipment, high-pressure pneumatic instruments, certain analytical systems, breathing air testing rigs, and high-pressure cleaning in food environments -- were either forced into over-engineered large compressor solutions or compromised on either pressure or air purity.
The EP-CMW3.0-1.2 is the world's first oil-free scroll air compressor to reach 1.2 MPa. It did not enter an existing product category -- it created one.
Why 1.2 MPa Is an Engineering Boundary for Oil-Free Scroll Compressors
Scroll compressors achieve compression by geometry: the progressive reduction in volume of crescent-shaped air pockets as they travel from the scroll periphery toward the central discharge port. At higher working pressures, the compression ratio increases, and two physical challenges become acute.
First: scroll housing deflection. As discharge pressure rises, the pressure differential across the scroll assembly increases. In a conventional scroll housing, this differential creates bending forces on the stator scroll that can deform the scroll geometry at the micron level -- enough to compromise the tip seal contact and allow pressure blow-by. At 0.8 MPa, this deflection is manageable with standard housing designs. At 1.0 MPa it requires careful engineering. At 1.2 MPa, without a fundamentally stiffer housing architecture, tip seal integrity cannot be maintained reliably across the full operating temperature and load range.
Second: discharge temperature. Higher compression ratios produce higher discharge temperatures. At 1.2 MPa, scroll discharge air temperature increases significantly above the 0.8 MPa baseline. Without an enhanced cooling arrangement, this temperature increase degrades tip seal material over time and reduces volumetric efficiency as the compressed air expands slightly in the high-temperature discharge zone.
Ever Power's engineering team solved both problems through the development of the high-stiffness square air-end housing -- a geometry that distributes pressure-induced bending forces across a larger cross-section, maintaining scroll profile tolerances at 1.2 MPa working pressure -- and an enhanced independent cooling arrangement that keeps discharge temperatures within a range compatible with long-term tip seal integrity. These solutions, which are now protected in the CMW platform design and referenced in national standards JB/T 11882-2014 and JB/T 12565-2015, are what make a 2-year air-end warranty at 1.2 MPa credible and deliverable.
What Becomes Possible at 1.2 MPa Oil-Free
The applications that benefit specifically from 1.2 MPa oil-free air share a common characteristic: they need the additional pressure headroom for a process reason, not just for pipeline loss compensation. In each case, 0.8 or 1.0 MPa is insufficient, and high-pressure oil-based compressors introduce contamination that invalidates the process.
High-Pressure Specialty Spray Finishing
Certain HVLP and conventional spray guns designed for automotive touch-up, aerospace component coating, and fine ceramics finishing specify inlet pressures of 1.0-1.2 MPa to achieve atomisation characteristics -- droplet size, velocity, and pattern uniformity -- that lower pressures cannot replicate. Oil contamination in these applications causes immediate surface defects. The EP-CMW3.0-1.2 provides the pressure without the contamination.
Breathing Air Quality Testing and Calibration
Breathing air compressor output testing and calibration rigs for diving, fire services, and industrial SCBA equipment often require a reference-quality oil-free air source at 1.2 MPa to provide the calibration pressure without introducing oil that would contaminate the equipment under test. Previously, no compact oil-free unit at this pressure existed for this role.
High-Pressure Pneumatic Instrument Calibration
Pressure transmitters, control valves, and safety relief devices rated above 1.0 MPa require calibration and proof-testing with a clean air source at the instrument's rated pressure. Oil contamination during calibration can seat in valve seats and pressure ports, affecting the instrument's long-term accuracy. A compact 1.2 MPa oil-free source solves this at the bench level.
Food Processing High-Pressure Cleaning Systems
Certain high-pressure air cleaning operations in food factories -- blowing debris from conveyor joints, packaging moulds, and heat-seal tooling -- specify 1.0-1.2 MPa for cleaning effectiveness. Oil in the cleaning air creates an immediate food safety risk. The EP-CMW3.0-1.2 provides the pressure with zero oil risk.
Specialty Gas Handling and Transfer
Certain laboratory gas handling operations -- pressurising sample containers, transferring non-reactive gas at elevated pressure, testing pressure vessel integrity -- require a clean compressed air source at 1.2 MPa where gas purity is essential. A compact, quiet, oil-free unit at this pressure is an enabling technology for these applications.
Pneumatic Logic Systems at High Operating Pressure
Industrial automation and process control systems using pneumatic logic circuits sometimes specify supply pressures above 1.0 MPa to achieve faster actuation speeds and higher force outputs from compact actuators. Where the controlled process is oil-sensitive -- food, pharma, electronics -- the compressed air must be oil-free at the higher pressure.
Scroll Compression at 1.2 MPa: What the Air-End Does Differently
The compression cycle in the EP-CMW3.0-1.2 follows the same orbital scroll mechanics as lower-pressure CMW models, but with scroll geometry engineered for the higher compression ratio. Air enters at the scroll periphery -- the outermost point of the two interfacing involute profiles -- and is sealed into crescent-shaped pockets. The orbiting scroll traces its circular path, progressively reducing the volume of each pocket as it travels inward. In the 1.2 MPa model, the scroll profiles are designed with a longer compression path than in 0.8 or 1.0 MPa variants, achieving the additional volume reduction needed to reach 1.2 MPa at the central discharge port without increasing scroll head size.
The high-stiffness square housing maintains the fixed scroll's position to within the tight geometric tolerances required for consistent tip seal contact at 1.2 MPa pressure differential. The independent cooling fan manages the higher discharge temperatures inherent in this compression ratio, keeping thermal conditions within the operating range of the tip seal material throughout the full 2-year warranty period. The 3 kW permanent magnet motor provides the additional drive torque required at this compression ratio while maintaining the direct-drive configuration -- no belt, no coupling, no transmission losses -- that keeps noise at 49 +/- 3 dB(A) despite the higher working pressure.
Why Not a Booster Compressor Instead?
The most common workaround for 1.2 MPa oil-free air before the EP-CMW3.0-1.2 was a booster compressor connected to a standard 0.8 MPa oil-free unit. This approach has specific, predictable weaknesses that the EP-CMW3.0-1.2 eliminates entirely.
| Criterion | EP-CMW3.0-1.2 (direct 1.2 MPa scroll) | Alternative: oil-free primary + booster |
|---|---|---|
| Air quality | Structurally oil-free at 1.2 MPa -- no oil enters the compression chamber | Oil-free primary stage + booster stages that typically require separate sealing and filtration; oil-free status of boosted output must be validated separately |
| Failure points | Single compression unit, single PLC controller, single maintenance record | Two separate machines, two control systems, two maintenance schedules; booster failure stops air supply completely |
| Noise level | 49 dB(A) -- single-head scroll noise profile at 1.2 MPa | Primary compressor noise plus booster noise; typically 65-75 dB(A) combined for reciprocating booster |
| Footprint | 670 x 630 x 945 mm, 135 kg -- benchtop-compatible | Primary compressor footprint plus booster footprint plus interconnecting pipework; rarely under 1.5 m combined |
| Energy efficiency | Direct scroll compression to 1.2 MPa in one stage; PM motor >94% efficiency | Two-stage compression with inter-stage losses; booster efficiency typically 70-85% on top of primary losses |
| Pressure pulsation | Pulse-free -- scroll compression produces continuous smooth output at 1.2 MPa | Reciprocating boosters introduce significant pressure pulsation that can affect sensitive instruments and spray equipment |
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | EP-CMW3.0-1.2 |
| Distinction | World's first oil-free scroll air compressor at 1.2 MPa |
| Motor Power | 3 kW / 5 HP |
| Working Pressure Range | 0.2 - 1.2 MPa |
| Free Air Delivery (FAD) | 210 L/min (at rated 1.2 MPa) |
| Noise Level | 49 +/- 3 dB(A) |
| Outlet Connection | 1/2 inch stainless steel |
| Weight | 135 kg |
| Dimensions L x W x H | 670 x 630 x 945 mm |
| Air-End Warranty | 2 Years (at full 1.2 MPa working pressure) |
| Motor Type | Permanent Magnet, IP65, F-class insulation, >94% efficiency |
| Drive | Direct Drive -- no belt, no coupling |
| Housing Design | High-stiffness square air-end (world-first, 1.2 MPa rated) |
| Standards | JB/T 11882-2014, JB/T 12565-2015 (Ever Power contributed to drafting) |
| Cooling | Independent cooling fan -- manages 1.2 MPa discharge temperature |
| Air-Contact Surfaces | Stainless Steel throughout |
| Inlet Filtration | 1 micron |
| Lubrication | Oil-Free -- annual bearing grease only |
Three Applications the EP-CMW3.0-1.2 Made Possible
Australia -- Aerospace Component Finishing Workshop
High-Pressure Oil-Free Air for Controlled Atmospheric Spray Coating
An aerospace subcontractor in Brisbane applying corrosion-inhibiting primer to aluminium structural components required a 1.2 MPa oil-free air supply for their spray equipment -- a specification driven by the need for a specific atomisation velocity that their 0.8 MPa unit could not achieve. Their previous solution was a piston compressor with three-stage oil coalescence filtration, which still generated occasional oil misting events that required component stripping and recoating. The EP-CMW3.0-1.2 provided 1.2 MPa oil-free air at 210 L/min -- sufficient for two simultaneous spray guns -- without any downstream filtration. In the 20 months since installation, the facility recorded zero oil-related coating rejections, compared to an average of eight per month under the previous system.
★★★★★
"Eight oil-related rejections per month down to zero. The 1.2 MPa pressure is exactly what the gun was designed for. We removed the oil filters entirely." -- Finishing Shop Supervisor
Netherlands -- Analytical Instrument Manufacturer
Reference-Quality 1.2 MPa Air for Pressure Transmitter Calibration Rigs
A Dutch manufacturer of industrial pressure transmitters needed a compact 1.2 MPa oil-free air source for their production-line calibration stations, where each transmitter is proof-tested at its rated pressure before shipment. Their rated instruments extended to 1.2 MPa, but their previous oil-free compressor delivered only 0.8 MPa -- requiring a booster that introduced pulsation affecting calibration measurement repeatability. The EP-CMW3.0-1.2 eliminated both the booster and the pulsation. Calibration station cycle time reduced because instruments reached test pressure faster from a direct 1.2 MPa source, and measurement repeatability improved to the point where the calibration team reduced their three-repeat protocol to two repeats without increasing their calibration uncertainty.
★★★★★
"No more booster, no more pulsation, fewer calibration repeats. Our measurement uncertainty actually improved." -- Calibration Engineer
Canada -- SCBA Equipment Service Centre
Oil-Free 1.2 MPa Reference Air for Breathing Apparatus Testing
A Canadian industrial safety equipment service centre certifying and testing self-contained breathing apparatus (SCBA) for mining and petrochemical customers needed a certified oil-free air source at 1.2 MPa for their test rigs. Breathing apparatus testing regulations in their jurisdiction specified that the reference air source used for flow and pressure tests must itself meet breathing air quality standards -- which their existing boosted oil-injected system could not certify. The EP-CMW3.0-1.2 provided an oil-free source at the required pressure that could be documented in their quality management system without qualification caveats. Their certification auditor specifically noted the compressor specification as a compliance improvement in the follow-up audit report.
★★★★★
"The auditor specifically mentioned the compressor upgrade as a compliance improvement. Oil-free at 1.2 MPa -- documented cleanly in our QMS without caveats." -- Technical Director
Frequently Asked Questions -- EP-CMW3.0-1.2
Is 1.2 MPa genuinely achievable from an oil-free scroll compressor without compromising air quality?
Yes. The EP-CMW3.0-1.2 achieves 1.2 MPa oil-free output through two specific engineering solutions: the high-stiffness square air-end housing that maintains scroll geometry at the higher pressure differential, and an enhanced independent cooling system that manages discharge temperatures within tip seal material limits. The 2-year warranty at full 1.2 MPa working pressure is the practical expression of confidence in these solutions.
How can the 2-year warranty apply at a pressure tier with no scroll compressor precedent?
The warranty is underpinned by an extended testing programme at 1.2 MPa across varied ambient conditions and duty cycles, plus engineering analysis of housing deflection behaviour and tip seal thermal performance at this pressure. Because 1.2 MPa was a new boundary for scroll technology, the validation programme before production release was more rigorous than at lower pressure tiers.
Is the 210 L/min FAD figure measured at 1.2 MPa or at a lower pressure?
The 210 L/min free air delivery is measured at the rated maximum working pressure of 1.2 MPa. At lower working pressures within the 0.2-1.2 MPa range, volumetric output will be somewhat higher due to the reduced compression ratio. If your application requires the maximum possible volume at a pressure below 1.2 MPa, the appropriate lower-pressure model from the EP-CMW range will provide better FAD performance.
Can this compressor run continuously at 1.2 MPa or is it limited to duty cycles?
The EP-CMW3.0-1.2 is designed and tested for continuous duty at 1.2 MPa. The independent cooling fan is sized for the thermal load at full 1.2 MPa working pressure under continuous operation. The PLC monitors discharge temperature throughout and provides thermal protection. The 2-year warranty applies equally to continuous-duty installations.
What downstream equipment is needed for specific particle and dew point classes at 1.2 MPa?
The oil-free compression output meets ISO 8573-1 Class 0 for oil content at 1.2 MPa. For specific particle count or moisture class requirements, a 1.2 MPa-rated inline particulate filter and refrigerated or desiccant dryer should be specified downstream. Downstream equipment must be rated for 1.2 MPa working pressure -- standard 0.8 or 1.0 MPa rated equipment is not suitable for use at 1.2 MPa without pressure de-rating.
Specifying the EP-CMW3.0-1.2 for Your Application
The EP-CMW3.0-1.2 exists because a set of genuine engineering problems -- high-pressure oil-free air in compact form, without pulsation, without a booster, without filtration compromise -- had no credible solution before Ever Power developed one. If your application is on that list, this is the compressor that was designed for it.
Ever Power's application engineering team can advise on downstream equipment ratings at 1.2 MPa, system design for 1.2 MPa distribution, and validation documentation for regulated applications. Learn more about Ever Power's engineering background and manufacturing standards, or review the complete EP-CMW 1.2 MPa range for higher-volume options at this pressure tier.
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