Tianhong TH-2007H Zero Air Generator

Overview

The Tianhong TH-2007H Zero Air Generator is an engineered source of ultra-purified compressed air specifically designed for calibration, background compensation, and zero-point verification in ambient air quality monitoring systems, gas analyzers (e.g., UV photometric O₃, chemiluminescent NOₓ, pulsed fluorescence SO₂), and laboratory-grade trace gas measurement platforms. It operates on a dual-stage purification principle: first, ambient air is drawn in and compressed into a buffer tank where bulk water is mechanically separated; second, the compressed air passes sequentially through a proprietary desiccant-based dew point control module (achieving −15 °C dew point), a patented catalytic scrubber for CO and hydrocarbon oxidation, and a triple-stage particulate/chemical filter assembly targeting reactive gaseous contaminants—including NO, NO₂, SO₂, O₃, and residual VOCs. This architecture ensures consistent delivery of zero air meeting stringent international reference gas specifications required by EPA Method TO-14A, ISO 8573-1 Class 1 for particles and Class 2 for moisture, and compatibility with US EPA Trace-Level Calibration Protocols.

Key Features

• Patented multi-stage purification system (ZL200910161771.8, ZL200920171495.9) integrating catalytic CO/hydrocarbon oxidation, deep-dew-point desiccation, and reactive gas adsorption
• Stable output flow range of 0–10 L/min at nominal 200 kPa pressure—adjustable via integrated precision flow control valve (ZL200920175426.5)
• Automated moisture removal with real-time dew point stabilization at −15 °C, eliminating need for external dryers or cryogenic traps
• Thermal overload protection for the oil-free diaphragm compressor ensures safe continuous operation under variable ambient loads
• Compact benchtop footprint (W×D×H: 420 × 320 × 280 mm) with front-panel digital pressure gauge and status LED indicators for system health monitoring
• No consumable cartridges required for standard operation—regenerative desiccant and catalyst modules support >12 months of maintenance-free service under typical lab use

Sample Compatibility & Compliance

The TH-2007H delivers zero air compliant with critical regulatory and methodological requirements for environmental instrumentation validation. Its verified contaminant levels—SO₂ < 0.5 ppb, NO < 0.5 ppb, NO₂ < 0.5 ppb, O₃ < 1.0 ppb, and CO < 10 ppb—are validated per ISO/IEC 17025-accredited interlaboratory comparison protocols and align with ASTM D6163 (Standard Practice for Generating Zero Air) and EPA 40 CFR Part 53 Appendix A criteria for reference method equivalency testing. The unit is suitable for use with federal equivalent methods (FEM) and federal reference methods (FRM) analyzers, including those deployed in national air monitoring networks (NAMS) and European EEA-certified stations. All internal wetted materials meet USP Class VI biocompatibility standards, and the system design supports GLP-compliant audit trails when integrated with third-party data loggers.

Software & Data Management

While the TH-2007H operates as a standalone hardware generator without embedded firmware or touchscreen interface, it features analog 0–10 VDC and 4–20 mA output signals for remote pressure and flow status monitoring. These outputs are compatible with SCADA systems, PLC-based environmental control cabinets, and centralized building management platforms. Optional RS-485 Modbus RTU communication module (sold separately) enables integration into ISO 13485 or FDA 21 CFR Part 11–compliant instrument networks, supporting timestamped operational logs, runtime counters, and alarm event records for GMP/GLP documentation. No proprietary software is required; configuration and diagnostics are performed via industry-standard Modbus registers accessible through common HMI or LabVIEW environments.

Applications

• Zero calibration and span verification of ambient air analyzers (O₃, NOₓ, SO₂, CO, VOCs) in regulatory monitoring stations
• Baseline correction in Fourier-transform infrared (FTIR) and cavity ring-down spectroscopy (CRDS) trace gas detection systems
• Carrier and purge gas supply for GC-FID, GC-ECD, and PTR-MS instruments requiring low-background inert gas streams
• Reference gas generation for indoor air quality (IAQ) sensor validation and HVAC commissioning tests
• Support gas for ozone generators used in calibration transfer standards (e.g., NIST-traceable ozone calibrators)
• Lab-scale simulation of clean-air exposure chambers in toxicology and aerosol research

FAQ

What zero air purity specifications does the TH-2007H meet?

It delivers SO₂ < 0.5 ppb, NO < 0.5 ppb, NO₂ < 0.5 ppb, O₃ < 1.0 ppb, and CO < 10 ppb—validated per ASTM D6163 and EPA trace-level calibration guidance.
Is the unit suitable for continuous 24/7 operation?

Yes—engineered for unattended operation with thermal protection, automatic condensate drainage, and regenerative purification media supporting >8,000 hours MTBF.
Does it require external power conditioning or compressed air input?

No external air source is needed; it draws ambient air directly. Input power is standard 220 VAC ±10%, 50 Hz; no voltage stabilizer required under normal grid conditions.
Can output flow and pressure be externally controlled?

Yes—via 0–10 VDC analog input for flow modulation and 4–20 mA loop-powered pressure feedback, compatible with industrial automation systems.
Are replacement filters or catalysts available as spare parts?

Yes—original-equipment desiccant cartridges, catalytic scrubber modules, and particulate pre-filters are stocked globally with documented shelf life and reactivation procedures.