Tisch ZA-737-50 Zero Air Generator
| Brand | Tisch |
|---|---|
| Origin | USA |
| Model | ZA-737-50 |
| Zero Air Purity | <1 ppb (for SO₂, H₂S, NO, NO₂, NH₃, O₃, CO, hydrocarbons, CO₂, COS, SF₆, fluorocarbons) |
| Flow Rate | 50 L/min |
| Output Pressure | 80 psi |
| Dew Point | −50 °C |
| Flow Measurement Accuracy | ±1 L/min |
Overview
The Tisch ZA-737-50 Zero Air Generator is an engineered solution for laboratories and ambient air monitoring stations requiring ultra-pure, catalytically purified compressed air as a reference or calibration medium. Designed and manufactured in the United States, this system employs a multi-stage purification architecture—including high-efficiency particulate filtration, activated carbon adsorption, catalytic oxidation of hydrocarbons and CO, and selective chemical scrubbing—to eliminate trace contaminants down to sub-part-per-trillion levels for critical analytes. Its core function is to generate zero air compliant with EPA Method TO-14/TO-15, ASTM D6196, and ISO 8573-1 Class 1 specifications, serving as a stable, on-demand alternative to high-pressure cylinder gas. The ZA-737-50 delivers continuous, pressure-stable output at 50 L/min—ideal for calibrating ozone analyzers, NOx chemiluminescence detectors, GC-FID systems, and photometric gas monitors used in regulatory-grade ambient air quality networks.
Key Features
- Multi-stage purification train: Particulate pre-filter → activated carbon bed → heated catalytic converter (for CO and hydrocarbon oxidation) → sulfur-specific scrubbers (for H₂S, SO₂, COS) → optional ozone destruct catalyst
- Real-time flow control via precision needle valve and calibrated rotameter or digital LED flow meter (±1 L/min accuracy)
- Integrated dual-pressure gauges: inlet (for supply air monitoring) and outlet (for system backpressure verification)
- Robust stainless-steel and anodized aluminum construction; CE-compliant electrical enclosure (115 V / 60 Hz or 220–240 V / 50–60 Hz, 15 A circuit)
- Factory-certified dew point performance: ≤ −50 °C at 80 psi, ensuring condensation-free operation in cold-trap and GC carrier gas applications
- Modular design supports benchtop or rack-mount installation; compatible with standard 19″ laboratory racks or custom mounting frames
Sample Compatibility & Compliance
The ZA-737-50 produces zero air meeting stringent purity thresholds required by U.S. EPA, EU EN 14625, and ISO/IEC 17025-accredited laboratories. Verified contaminant levels include: SO₂ & H₂S < 0.5 ppb; NO & NO₂ & NH₃ < 0.5 ppb; O₃ & CO < 1 ppb; total hydrocarbons (as methane) < 0.5 ppt (0.0005 ppm); CO₂ < 1 ppm; COS & SF₆ & fluorocarbons < 1 ppb. This specification satisfies calibration requirements for federal reference method (FRM) and federal equivalent method (FEM) analyzers under 40 CFR Part 53. The unit is routinely deployed by U.S. EPA regional labs, state air monitoring agencies (e.g., CA ARB, NY DEC), NIST-traceable calibration facilities, and university atmospheric chemistry research groups conducting long-term stability studies.
Software & Data Management
While the ZA-737-50 operates as a stand-alone hardware system without embedded firmware or network connectivity, it is fully compatible with external data acquisition platforms used in GLP/GMP environments. All operational parameters—including inlet pressure, outlet pressure, flow rate, and runtime hours—are mechanically indicated or manually logged. For audit-ready compliance, users integrate the generator into validated instrument qualification protocols per FDA 21 CFR Part 11 when used in pharmaceutical environmental monitoring or cleanroom air testing. Calibration certificates (traceable to NIST standards) and full factory test reports—including individual contaminant chromatograms and dew point validation curves—are supplied with each unit.
Applications
- Ambient air quality monitoring: Primary calibration source for regulatory-grade O₃, NOx, SO₂, and CO analyzers in national air surveillance networks
- Laboratory reference gas generation: Carrier gas for GC-FID, purge-and-trap systems, and dilution calibrators (e.g., Environics 4000 series)
- Instrument zeroing and baseline verification: Enables drift correction for UV photometric, electrochemical, and laser-based gas sensors
- Research-grade atmospheric simulation: Provides contaminant-free air matrix for chamber studies on VOC oxidation kinetics and aerosol formation
- Pharmaceutical environmental monitoring: Supports ISO 14644-1 classified cleanroom air testing where background interference must be eliminated
FAQ
What inlet air quality is required for optimal ZA-737-50 performance?
The generator requires oil-free, desiccated compressed air feed with ≤ 0.01 mg/m³ particulates, ≤ 0.1 ppm oil vapor, and dew point ≤ −20 °C. Use of a refrigerated dryer + coalescing filter upstream is strongly recommended.
Can the ZA-737-50 be integrated into an automated calibration system?
Yes—its stable 80 psi output and analog flow control interface allow seamless integration with programmable dilution calibrators and auto-calibration manifolds compliant with EPA 40 CFR Part 58 Appendix A.
How often do consumables require replacement?
Catalyst beds are rated for ≥ 12 months at 50 L/min continuous operation; carbon and sulfur scrubbers require replacement every 6–9 months depending on inlet air quality. Full maintenance schedule and part numbers are provided in the operator manual.
Is the unit suitable for mobile or field-deployable monitoring?
With dimensions of 533 mm × 464 mm × 711 mm (H×W×D) and weight of 56.7 kg (125 lbs), the ZA-737-50 is designed for fixed laboratory or trailer-mounted deployment—not handheld or battery-operated field use.
Does Tisch provide third-party certification for zero air purity claims?
Yes—each unit ships with a NIST-traceable Certificate of Analysis documenting real-time GC-MS and chemiluminescence validation data for all listed contaminants, measured per ASTM D6196 Annex A1.
