Guaranteed 0 ppm Oil — ISO 8573-1 Class 0

Water replaces mineral oil completely as the working medium inside the compression host. Discharge air is independently verified at 0 ppm oil content under all operating conditions. Unlike oil-injected machines with downstream coalescers, there is no risk of oil carryover into the air network from filter saturation, degraded filter media, or bypass events — the compressor is physically incapable of introducing oil into the air stream.

Discharge Temperature Below 45 °C — Eliminating Fire and Burn Risk

The water-cooled isothermal compression process maintains the main host temperature below 45 °C continuously, regardless of ambient temperature or load fraction. This eliminates the fire and auto-ignition risk associated with high-temperature dry-screw oil-free machines operating at 180 to 200 °C. Personnel contact with external compressor surfaces is safe, and the compressed air entering the downstream dryer is already substantially cooled, reducing dryer energy consumption and extending dryer service intervals.

Proven Simplicity — No Gearbox, No Timing Gears, No Seals

Compared with a conventional dry twin-screw oil-free compressor requiring 5 to 7 timing gears, 15 or more bearings, and precision PTFE-coated screw surfaces, the CM Series fixed-speed host contains zero gears, 7 bearings, and no mechanical shaft seals. Each eliminated component is an eliminated failure mode and maintenance task. The direct mains coupling of the industrial frequency model adds further mechanical simplicity by removing the inverter drive electronics from the power path entirely.

Two-Consumable Maintenance — Air Filter and Water Filter Only

The only items requiring periodic replacement on the CM Series fixed-speed model are the inlet air filter element and the lubricating water filter cartridge, both serviced every 1,000 to 2,000 operating hours. There is no compressor oil to drain and refill, no oil separator element to rebuild, no gearbox fluid to monitor, and no PTFE screw coating to inspect for delamination. This reduces the annual maintenance cost to a minimal level and eliminates the categories of maintenance error that most commonly cause compressed air quality failures on conventional oil-free machines.

Low Noise from 58 dB(A) — No Gearbox Whine

A primary source of noise in conventional high-speed dry-screw oil-free compressors is the high-pitched whine produced by speed-increasing gearboxes running at 6,000 to 25,000 RPM. The CM Series has no gearbox, operating at a single mains-synchronous 3,000 RPM throughout — eliminating this noise source entirely. Combined with the patented sound-dampening inlet structure and high-density acoustic enclosure panels, small CM Series fixed-speed models achieve noise levels from 58 dB(A), comparable to a quiet office environment.

Long Service Life — Host Design Life Over 25 Years

Operating at only 3,000 RPM with hydrodynamic water film lubrication and bearing loads balanced by the symmetric star-wheel geometry, the stainless-steel single-screw host accumulates fatigue at a substantially lower rate than high-speed dry-screw alternatives. The aerospace-composite star-wheel material, screened to aviation inspection standards, resolves the historical wear limitation of water-lubricated designs. With no gearbox to fail and a main host designed for over 100,000 hours of service, the CM Series fixed-speed model delivers a total cost of ownership substantially lower than its headline purchase price suggests.

Integrated IoT Monitoring — Remote Visibility on Fixed-Speed Operation

All CM Series industrial frequency units include the integrated IoT monitoring platform as standard: a 10-inch colour touchscreen controller with RS485 and Modbus RTU output displays all operating parameters, fault codes, maintenance timers, and operating history. The cloud platform supports remote start-stop command, real-time pressure and temperature trending, and pre-fault alert notification — enabling predictive maintenance scheduling. RS485 connectivity supports integration with plant DCS or SCADA systems for centralised utility monitoring.

Three-Phase Induction Motor — Direct Mains-Coupled

The industrial frequency CM Series uses a standard IE2 or IE3 three-phase induction motor direct-coupled to the single-screw host with no intervening gearbox or belt drive. Direct coupling eliminates belt wear, belt replacement costs, and the alignment maintenance associated with indirect drives. Motor protection class IP55 and insulation class F are standard, permitting continuous 24-hour operation in dusty or humid plant environments. Motors are available in 380 V, 400 V, 415 V, 440 V, and 480 V configurations to suit local grid standards across global markets.

PLC Controller with Colour HMI — Load-Unload Automation

The integrated PLC manages the full load-unload control cycle, inlet valve actuation, protection shutdowns, and maintenance scheduling. A 10-inch colour touchscreen displays current operating mode (loaded, unloaded, standby), system pressure, discharge temperature, motor current, water circuit status, and cumulative running hours. User-adjustable load and unload pressure setpoints allow the pressure band to be configured to match downstream system requirements. RS485 Modbus RTU output enables integration with plant SCADA and DCS infrastructure.

Patented High-Efficiency Inlet Valve

The proprietary inlet valve operates in minimum-pressure intake mode during the loaded state, maximising volumetric efficiency by minimising inlet throttling losses. During the unloaded state, it closes fully to prevent reverse flow and recirculation through the compression host. The modular cassette body design allows the valve to be serviced or replaced without disturbing the main compressor pipework, reducing planned maintenance downtime to under 30 minutes per service event.

All-Stainless Water-Gas Separator

Full 304 stainless-steel construction throughout the water-gas separation vessel and internal baffles. No polymer linings, no galvanised surfaces, and no copper alloy components that could introduce contamination into the water circuit or corrode in chemically aggressive ambient environments. The internal streamlined flow-accelerator baffles drive the water-air mixture to 10 m/s at the separation point, achieving greater than 99.9% bulk water removal before the air reaches the downstream filter and dryer system.

All-Stainless Single-Screw Host — Patented Seal-Free Design

The full stainless-steel single-screw compression host is the mechanical foundation of the CM Series oil-free concept. The patented shaft-seal-free design eliminates the primary failure and leakage mode of conventional compressors. Precision-machined to aerospace-grade dimensional tolerances, the host achieves high volumetric efficiency at 3,000 RPM with water film sealing replacing all conventional mechanical seals. Designed service life of the host assembly exceeds 100,000 hours under rated conditions with correct water quality maintenance.

Lubricating Water Filtration System — 0.1 Micron Rated

The stainless-steel outer-shell water filter housing accepts the proprietary high-density multi-layer glass-fibre filter cartridge rated to 0.1 micron absolute. This filtration level maintains water purity sufficient to protect the bearing surfaces and star-wheel gate rotors from abrasive particles throughout the lubrication circuit. Filter element service life of 1,000 to 2,000 hours is achieved without performance degradation. Replacement is tool-free and takes under 15 minutes, requiring no drain of the full water circuit.

All-Stainless Plate Heat Exchanger

High-performance stainless-steel plate heat exchanger with multi-pass flow geometry ensures the water returning from the compression host is cooled to below 35 °C before re-injection, maintaining consistent lubrication water temperature and preventing thermal build-up during extended continuous operation. Superior heat transfer per unit of face area compared with tubular or shell-and-tube alternatives reduces exchanger physical size and weight. Stainless construction resists mineral scaling and biological fouling, extending heat exchanger service intervals significantly in hard-water installations.

Aerospace Composite Star-Wheel — Resolved Wear Challenge

The star-wheel gate rotor is the only polymer-composite contact component in the compression path and historically represented the primary durability limitation of water-lubricated single-screw compressors. The proprietary aerospace-grade composite material formulation, combined with precision radial placement within the screw housing, has definitively resolved the wear issue. Each star-wheel passes aviation-standard screening and dimensional inspection before assembly, ensuring long-term conformance with less than 5% measured performance degradation over 50,000 hours of continuous operation.

Pharmaceutical GMP Manufacturing

Tablet coating pans, sterile filling lines, lyophilisation chamber pneumatics, and API synthesis reactor controls all require a continuous, stable supply of Class 0 oil-free compressed air. The CM Series fixed-speed model delivers uninterrupted constant-pressure output ideal for continuous-process pharmaceutical operations where demand variation is minimal and supply interruption is not acceptable. ISO 8573-1 Class 0 certification and sub-45 °C discharge temperature meet the most stringent GMP compressed air specifications without downstream oil filters that require periodic validation testing.

Recommended: CM08BF to CM132BF (7.5 to 132 kW)

Food and Beverage Processing

Continuous food production lines — bottling, canning, filling, CIP air agitation, modified-atmosphere packaging, and pneumatic product transfer — operate at high and stable compressed air demand levels throughout extended production shifts. Fixed-speed units are ideal for these profiles, running loaded throughout the shift and unloaded only during scheduled breaks. The zero oil content of CM Series discharge air meets BCAS, BRC, and FDA food-grade compressed air standards, eliminating the product contamination risk that periodic coalescer filter failure creates in oil-injected systems.

Recommended: CM15BF to CM200B (15 to 200 kW)

Electronics and Semiconductor Fabrication

Clean-room chip fabrication, PCB manufacturing, LED packaging, and flat-panel display production require ISO Class 0 compressed air with no risk of oil contamination of photolithographic surfaces or sensitive component contacts. The CM Series fixed-speed model is well suited to semiconductor fabs where compressors run at near-constant load during production shifts, supplying instrument air and process air to stable demand loads. The quiet operation from 58 dB(A) is also beneficial in electronics manufacturing environments where acoustic comfort matters.

Recommended: CM30BF to CM160BF (30 to 160 kW)

Chemical and Petrochemical Process

Instrument air supply for control valves, fluidisation air for catalyst beds, and pneumatic conveying in chemical plants require oil-free air to prevent catalyst poisoning and unwanted side reactions. Fixed-speed CM Series units supply these continuous-duty loads at steady pressure, while the all-stainless water circuit construction resists corrosion from chemically aggressive ambient air conditions common in chemical plant environments. The below-45 °C discharge temperature also reduces auto-ignition risk in facilities where flammable vapour atmospheres are possible.

Recommended: CM75BF to CM320B (75 to 320 kW)

Spray Painting and Surface Coating

Automotive, aerospace, and industrial coating lines operate continuously during production shifts at predictable, stable air consumption rates, making them well suited to fixed-speed compressors. Oil contamination in the compressed air supply creates fish-eye paint defects, coating delamination, and adhesion failures — requiring costly rework. The CM Series zero-oil discharge eliminates the need for activated-carbon oil-vapour adsorbers that require frequent replacement and monitoring, while the low discharge temperature improves atomisation quality and first-pass transfer efficiency.

Recommended: CM22BF to CM110BF (22 to 110 kW)

PET Bottle Blowing — CM/G Fixed-Speed 20 to 40 Bar

High-pressure PET blow-moulding lines running at steady production rates throughout shifts are an ideal application for fixed-speed CM/G compressors at 2.0 to 4.0 MPa. The constant output of a fixed-speed 40-bar oil-free compressor matches the stable air consumption of continuous PET blowing machines without the added cost of VFD electronics. Zero oil content at 0 ppm protects PET mould surfaces and ensures food-contact compliance across the full production run without reliance on downstream filtration that could fail between inspection cycles.

Recommended: CM/G series (75 to 320 kW, 2.0 to 4.0 MPa)

High, stable utilisation rate. If your compressed air demand averages above 85% of compressor rated capacity for most of the operating shift, a fixed-speed unit will run nearly continuously loaded. The energy penalty of the fixed-speed load-unload strategy at this utilisation rate is minimal and the VFD cost premium is not recovered.

Continuous-duty process air. Applications such as pharmaceutical reaction vessels, food filling lines, and semiconductor fab instrument air operate at essentially constant demand throughout production shifts. Fixed-speed units match these profiles without the complexity of VFD electronics.

Multiple-compressor system design. In a compressor station with multiple units, a combination of one VFD trim machine and one or more fixed-speed base-load machines is often the most energy-efficient configuration. The VFD handles demand variation while the fixed-speed units run fully loaded at their most efficient operating point.

Electrically noisy or sensitive environments. VFD inverters generate harmonic disturbance in the supply network and electromagnetic interference that can affect sensitive measurement and control equipment. Where the electrical installation environment does not permit VFD use without additional harmonic filtration, the fixed-speed direct-online motor is the cleaner solution.

1. What is the difference between the CM Series industrial frequency and the CM Series VFD model?

2. How does load-unload control work on the fixed-speed CM Series?

3. Can the CM Series fixed-speed model start under load (direct-on-line starting)?

4. What maintenance is required and at what intervals?

5. Is the CM Series fixed-speed model suitable for GMP pharmaceutical environments?

6. What voltage and frequency options are available?

7. Can I pair a fixed-speed CM Series with a VFD CM Series in one compressor station?

8. What happens to air quality during an unloaded cycle — does the compressor still deliver air?

9. What certifications does the CM Series fixed-speed model hold?

10. What warranty and after-sales support are included?