Compressed air is inherently saturated with water vapor. When ambient air is compressed, relative humidity rises sharply — a 30 kW compressor can release several dozen liters of condensate into the air network every day.
A refrigerated dryer reaches only approximately +3°C PDP. Where the air network is exposed to freezing conditions — or where the end product requires ultra-dry air — only a desiccant (adsorption) dryer can reliably achieve a -40°C pressure dew point.
RAYDAFON's desiccant dryer for air compressor uses a pressure swing adsorption (PSA) process with dual drying towers. The adsorption capacity of the desiccant decreases as temperature rises and pressure drops — a fundamental principle that enables regeneration without replacing the desiccant material.
This variant incorporates an electric heater that warms the purge air before it enters the regenerating tower. By heating the purge flow, the required purge volume drops significantly — typically from ~15% to ~5–7% — reducing compressed air loss and energy costs.
For large flow rates, ambient air drawn by an external blower replaces compressed air as the purge medium, virtually eliminating purge air loss. Compression heat from the air compressor can also be recovered for regeneration, further reducing energy consumption.
| Parameter | Specification |
|---|---|
| Pressure Dew Point (PDP) | -40°C standard; -70°C optional |
| Air Quality Standard | ISO 8573-1:2010 Class 2 (dirt: 1 μm, water: -40°C PDP) |
| Desiccant Material | Activated alumina + molecular sieve composite bed |
| Max Inlet Pressure | 150 PSIG (10.3 bar) standard; 175 PSIG optional |
| Max Inlet Temperature | 49°C (120°F) |
| Purge Air Consumption | 12–15% (heatless); ~5–7% (heat regenerative) |
| Control | Solid-state timer with built-in memory; dew point control optional |
| Voltage | 110V / 220V / 380V / 440V (customizable) |
| Vessel Material | Carbon steel (standard) / Stainless steel 304/316 (optional) |
| Certifications | CE, ISO 9001 |
Prevents microbial growth in sterile environments. ISO 8573-1 Class 2 compliance for drug manufacturing, dental clinics, and laboratory air supply. Eliminating moisture is crucial because many raw materials are highly moisture-sensitive. See pharma applications →
Direct and indirect contact air must be contamination-free. Desiccant dryers stop corrosion and inhibit micro-organism growth in pneumatic packaging, blow-molding, and fermentation processes. See food applications →
Prevents condensation-induced defects on PCB assembly lines, SMT equipment, and cleanroom pneumatic systems. -40°C PDP safeguards high-value equipment from moisture-induced damage. See electronic applications →
Protects valves, actuators, and instrumentation from water washout and corrosion. Ensures steady pressure and flow with fully re-pressurizing design.
For a complete compressed air treatment system, pair your desiccant dryer with:
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