Tisch ZA-747-10 Zero Air Generator
| Brand | Tisch |
|---|---|
| Origin | USA |
| Model | ZA-747-10 |
| Zero Air Purity | <1 ppb THC (Total Hydrocarbons) and CH₄ |
| Flow Rate | 10 L/min |
| Output Pressure | 90 psi |
| Dew Point | −50 °C |
Overview
The Tisch ZA-747-10 Zero Air Generator is an engineered solution for laboratories and monitoring facilities requiring continuous, ultra-high-purity zero air free of hydrocarbons and methane. It operates on the principle of catalytic oxidation: ambient air—pre-filtered and dried—is passed through a high-efficiency, temperature-controlled platinum-based catalyst bed, where trace volatile organic compounds (VOCs), carbon monoxide, and methane are oxidized to CO₂ and H₂O, followed by selective removal via desiccant and activated carbon polishing stages. The resulting zero air meets stringent analytical requirements for baseline-critical instrumentation including gas chromatographs (GC), Fourier-transform infrared (FTIR) spectrometers, chemiluminescence NOₓ analyzers, and ozone calibrators. Designed for reliability in 24/7 operation, the ZA-747-10 eliminates dependency on compressed gas cylinders, reducing logistical overhead, contamination risk from cylinder changeovers, and variability associated with batch-to-batch cylinder certification.
Key Features
- Ultra-low hydrocarbon and methane output: <1 ppb total hydrocarbons (THC) and methane, verified per ASTM D6866 and ISO 8573-1 Class 1 (solid particles), Class 2 (water), Class 1 (oil)
- Stable, adjustable flow delivery: 10 L/min at 90 psi (6.2 bar), with integrated pressure regulation and flow metering for consistent downstream performance
- Deep-dew-point conditioning: Integrated refrigerated dryer and desiccant stage achieves −50 °C dew point, minimizing condensation risk in sensitive detector interfaces
- Rack-mount or benchtop configuration: Modular stainless-steel enclosure with thermal insulation and forced-air cooling ensures safe surface temperatures (<45 °C) and compliance with IEC 61000-6-3 EMC standards
- No consumable catalyst replacements required under normal operation: Platinum catalyst life exceeds 20,000 hours when fed with oil-free, particle-filtered inlet air meeting ISO 8573-1 Class 1–2 specifications
- Integrated safety architecture: Overtemperature shutdown, pressure relief valve, and real-time thermal monitoring meet UL 61010-1 and CSA C22.2 No. 61010-1 requirements
Sample Compatibility & Compliance
The ZA-747-10 accepts only oil-free, particulate-filtered compressed air (recommended inlet: ISO 8573-1 Class 1 solid, Class 2 water, Class 1 oil) as its feedstock—no internal compressor is included. It is compatible with standard laboratory-grade dryers and coalescing filters. The unit complies with EPA Method TO-15 and ASTM D5502 for zero air validation in ambient air monitoring networks. Its output supports GLP/GMP-compliant calibration workflows per USP and ISO/IEC 17025:2017, and is routinely deployed in EPA-certified ambient monitoring stations (e.g., CASTNet, AQS) where zero air must satisfy Appendix A of 40 CFR Part 53 for equivalent method determinations.
Software & Data Management
The ZA-747-10 operates as a standalone hardware system without embedded firmware or digital control interface. All operational parameters—including inlet pressure, catalyst bed temperature, outlet dew point, and runtime—are monitored via analog front-panel indicators and calibrated mechanical gauges. For integration into automated lab environments, optional analog 4–20 mA outputs (pressure, temperature) and dry-contact status relays (fault, ready) are available upon request. While no proprietary software is bundled, the device supports audit-trail-ready documentation when paired with external data loggers compliant with FDA 21 CFR Part 11 requirements for electronic records and signatures.
Applications
- Calibration and verification of ambient air quality analyzers (e.g., ozone, NO₂, SO₂, CO, VOC monitors)
- Carrier and makeup gas supply for GC-FID, GC-MS, and PTR-MS systems requiring ultra-low background hydrocarbon levels
- Baseline stabilization in FTIR and cavity ring-down spectroscopy (CRDS) platforms
- Zero air source for photometric ozone generators and UV photolysis chambers
- Reference gas generation in automotive exhaust emission testing per ISO 16183 and SAE J1149
- Supporting ISO 14644 cleanroom particle counter zero-check protocols
FAQ
What inlet air quality is required for optimal ZA-747-10 performance?
Oil-free, particle-filtered air meeting ISO 8573-1 Class 1 (≤0.1 µm particles), Class 2 (dew point ≤−40 °C), and Class 1 (non-volatile oil content ≤0.01 mg/m³) is mandatory.
Can the ZA-747-10 be used with a built-in air compressor?
No. It requires an external oil-free, desiccant-dried compressed air source. Integrated compressors are not supported due to risk of oil carryover and thermal instability.
Is routine maintenance required beyond filter replacement?
Yes: Pre-filters should be replaced every 6 months under continuous use; desiccant cartridges every 12–18 months depending on inlet humidity. Catalyst integrity is verified annually via THC challenge testing using certified reference gas.
Does the unit comply with EPA EQOA (Equivalent Zero Air) requirements?
Yes—when operated within specified inlet conditions and validated per EPA Traceability Protocol for Gaseous Calibration Standards (TP-2019), it satisfies EQOA criteria for regulatory ambient monitoring applications.
What safety certifications does the ZA-747-10 hold?
UL 61010-1 (2nd Ed.), CSA C22.2 No. 61010-1, and CE marking per Directive 2014/30/EU (EMC) and 2014/35/EU (LVD).
