SIGAS Medical Adsorption Dryer for Breathing Air Systems
| Brand | SIGAS |
|---|---|
| Origin | Germany |
| Model | SIGAS-MAD Series |
| Type | Twin-Tower Desiccant Air Dryer |
| Inlet Pressure Range | 6–10 bar(g) |
| Dew Point | ≤ −40 °C (at pressure) |
| Flow Capacity | 10–2000 Nm³/h |
| Filtration Stages | Pre-filter (ISO 8573-1 Class 2, 2, 2), Coalescing + Activated Carbon Post-filter (Class 1, 1, 1) |
| Regeneration Method | Purge-air (heatless) or Blower-assisted (optional) |
| Compliance | ISO 8573-1:2010, ISO 7396-1:2016, EN 13544-1:2021, DIN SPEC 5000-2, VDI 2083 Part 10 |
Overview
The SIGAS-MAD Series Medical Adsorption Dryer is an ISO-certified, twin-tower desiccant drying system engineered specifically for the production of high-purity breathing air in healthcare environments—including hospitals, anesthesia delivery units, ICU ventilators, and medical gas pipelines. It operates on the principle of pressure-swing adsorption (PSA), utilizing high-efficiency micro-porous desiccants (typically activated alumina and molecular sieve blends) to remove water vapor from compressed air to a guaranteed pressure dew point of ≤ −40 °C. Unlike refrigerated dryers, adsorption dryers achieve ultra-low moisture levels essential for preventing microbial growth, corrosion, and valve freezing in critical respiratory applications. The system integrates three-stage filtration—pre-filtration, dual-tower adsorption, and post-filtration—to meet the stringent purity requirements defined in ISO 8573-1:2010 (Class 1, 1, 1 for particles, water, and oil) and the medical gas infrastructure standard EN 13544-1:2021.
Key Features
- Twin-tower architecture with automatic, time- or demand-based switching ensures continuous, uninterrupted dry air output without pressure drop spikes.
- Pre-filtration stage removes particulates, liquid water, aerosol oil, and oil vapors down to 0.01 µm (ISO 8573-1 Class 2, 2, 2), significantly extending desiccant service life and reducing maintenance frequency.
- Desiccant beds composed of graded-layer media—activated alumina for bulk moisture removal and 3Å molecular sieve for deep drying—optimized for high adsorption capacity and long cycle stability.
- Regeneration process uses a controlled portion of dried product air (heatless purge) or optional blower-assisted hot-air regeneration, minimizing energy consumption while maintaining consistent dew point performance.
- Integrated silencer and muffler assembly on the exhaust line ensures compliance with occupational noise limits (<72 dBA at 1 m) in clinical settings.
- Robust stainless steel housing (AISI 316L wetted parts), IP65-rated control panel, and redundant pressure/temperature sensors support 24/7 operation under GMP-aligned facility conditions.
Sample Compatibility & Compliance
The SIGAS-MAD dryer is validated for use with oil-lubricated and oil-free compressors supplying medical air per ISO 7396-1:2016 and HTM 02-01 (UK). It accepts inlet air contaminated with up to 5 mg/m³ total oil content and handles ambient temperatures from 2 °C to 45 °C. All filtration elements conform to ISO 12500-1 (coalescing) and ISO 12500-3 (activated carbon) test protocols. Documentation packages include Factory Acceptance Test (FAT) reports, Material Certificates (EN 10204 3.1), and full traceability of desiccant batch certifications. The system supports validation per EU Annex 1, USP , and FDA 21 CFR Part 11 when integrated with SIGAS’s optional data-logging module (with audit trail and electronic signature capability).
Software & Data Management
The embedded PLC-based controller features a 7-inch HMI with multilingual interface (EN/DE/FR/ES), real-time monitoring of tower status, dew point trend logging, filter differential pressure alerts, and regeneration cycle counters. Optional Ethernet/IP or Modbus TCP connectivity enables integration into BMS or CMMS platforms. Historical data (≥12 months) is stored locally with CSV export and supports automated report generation for QA audits. Firmware complies with IEC 62443-3-3 SL2 cybersecurity requirements, and all configuration changes are logged with user ID, timestamp, and pre-/post-value comparison—fully satisfying GLP/GMP electronic record retention mandates.
Applications
- Hospital central medical gas systems supplying piped breathing air to operating theatres and critical care units.
- Mobile medical air carts and portable ventilator support systems requiring on-site dew point assurance.
- Pharmaceutical cleanroom compressed air networks where moisture-induced particulate shedding must be eliminated.
- Calibration laboratories maintaining reference-grade air for analytical instrumentation (e.g., GC carrier gas, FTIR purge lines).
- Research facilities conducting inhalation toxicology studies requiring trace-moisture-controlled exposure atmospheres.
FAQ
What is the typical service life of the desiccant under continuous hospital operation?
With proper pre-filtration and adherence to recommended maintenance intervals (every 24–36 months), the desiccant retains ≥95% of initial adsorption capacity for ≥5 years.
Can the dryer be retrofitted into an existing medical air pipeline?
Yes—the SIGAS-MAD series offers flanged (DIN/ISO PN16) and tri-clamp (DIN 11851) connection options, with custom inlet/outlet orientations and seismic anchoring kits available for retrofit installations.
Does the system require external cooling water or electrical heating for regeneration?
No—standard heatless purge regeneration operates solely on compressed air energy; optional blower-assisted regeneration requires only 230 VAC / 1.5 kW supply, eliminating dependency on chilled water or steam utilities.
How is compliance with ISO 8573-1 Class 1 verified during commissioning?
Third-party verification includes on-site dew point measurement (via chilled mirror hygrometer, ISO 8573-4), oil content analysis (GC-FID, ISO 8573-2), and particle counting (light extinction, ISO 8573-4), all documented in the Site Acceptance Test (SAT) report.
