ZAG High-Purity Zero Air Generator (Imported, UK-Made)

Overview

The ZAG High-Purity Zero Air Generator is an engineered solution for laboratories requiring continuous, ultra-clean zero air—specifically designed to meet the stringent gas purity demands of sensitive analytical instrumentation. Operating on the principle of catalytic oxidation followed by multi-stage filtration, the ZAG system converts ambient compressed air into zero air with total hydrocarbon (THC) levels consistently below 0.1 ppm (as methane), while eliminating oil aerosols, moisture, and particulates down to 0.01 µm. Unlike conventional air generators relying solely on adsorption, the ZAG employs a heated platinum catalyst operating within a precisely controlled temperature range (35–150 °F / 2–66 °C), enabling complete oxidation of residual hydrocarbons—including methane, ethane, and other volatile organic compounds—into CO₂ and water vapor, which are then removed via high-efficiency coalescing and desiccant stages. This architecture ensures baseline stability in flame ionization detectors (FIDs), nitrogen-phosphorus detectors (NPDs), and flame photometric detectors (FPDs), directly supporting compliance with ISO 8573-1 Class 1:2:1 inlet air requirements when used with external compressors.

Key Features

• Catalytic oxidation core with PID-controlled heated platinum catalyst (operating range: 2–66 °C) for reliable THC conversion
• Multi-stage purification train: coalescing filter (oil & particulate removal), desiccant dryer (dew point ≤ –40 °C), and sub-micron final filter (0.01 µm absolute rating)
• Integrated over-temperature safety cutoff to prevent thermal runaway during catalyst operation
• CE-marked per EU Machinery Directive 2006/42/EC and Low Voltage Directive 2014/35/EU
• Modular design supports integration into existing lab gas infrastructure; no internal compressor in standard configurations (ZAG-1, ZAG-3, ZAG-16)
• Optional integrated oil-free scroll compressor available (ZAG-3-1 variant), certified to ISO 8573-1 Class 0 for oil-free air
• Stable output pressure regulation across 0–10 barg, independent of inlet pressure fluctuations

Sample Compatibility & Compliance

The ZAG series delivers zero air compliant with instrumental gas specifications defined in ASTM D6216 (Standard Practice for Laboratory Air Quality), USP (Gas Purity for Chromatography), and ICH Q5C (stability-indicating methods). Its verified THC < 0.1 ppm (as CH₄) and particulate-free output make it suitable for GC-FID carrier and detector gases, calibration gas dilution systems, environmental emission analyzers (e.g., NOₓ, SO₂ monitors), and cleanroom purge applications. When paired with a Class 1:2:1 inlet air supply (per ISO 8573-1), the ZAG satisfies GLP/GMP audit requirements for traceable, documented gas quality—supporting 21 CFR Part 11-compliant data integrity when integrated with validated laboratory information management systems (LIMS).

Software & Data Management

While the ZAG operates as a standalone hardware system without embedded firmware or touchscreen interface, its analog process signals (catalyst temperature, outlet pressure, and thermal cutoff status) are accessible via 4–20 mA outputs for integration into facility SCADA or building management systems (BMS). Optional digital I/O modules enable remote start/stop control and alarm relay signaling—facilitating centralized monitoring in multi-instrument labs. All operational parameters—including catalyst setpoint, safety trip thresholds, and runtime hours—are mechanically logged via calibrated analog gauges and thermal cutout indicators, ensuring full traceability without software dependency.

Applications

• GC-FID, GC-NPD, and GC-FPD detector gas supply in pharmaceutical QC, environmental testing, and petrochemical analysis
• Zero air source for ambient air quality monitoring stations (e.g., EPA Method 21, EN 14625)
• Calibration gas blending systems requiring hydrocarbon-free diluent gas
• Purge gas for FTIR sample compartments and optical cavities
• Instrumental blank validation in low-level VOC analysis (e.g., TO-15, TO-17)
• Reference gas generation for sensor calibration in semiconductor fab cleanrooms

FAQ

Does the ZAG require an external air compressor?
Yes—standard models (ZAG-1, ZAG-3, ZAG-16) require a clean, oil-free compressed air feed meeting ISO 8573-1 Class 1:2:1 specifications. The ZAG-3-1 variant includes an integrated oil-free scroll compressor.
What is the maximum allowable inlet THC concentration?
The system is rated for inlet total hydrocarbons up to 10 ppm (as methane); exceeding this may reduce catalyst service life and compromise outlet purity.
Can the ZAG be used with GC-MS systems?
No—the ZAG is not designed for mass spectrometry applications, where oxygen-free or ultra-high-purity helium/hydrogen is required; it is optimized exclusively for combustion-based detector support.
How often must filters be replaced?
Coalescing and desiccant filters require replacement every 6–12 months depending on inlet air quality and daily usage; catalyst lifetime exceeds 2 years under nominal operating conditions.
Is the ZAG compatible with 21 CFR Part 11 requirements?
Yes—when integrated with validated third-party data acquisition systems that provide electronic audit trails, user authentication, and secure storage of operational logs.