Huai Ai HA-9660-PDD Online Gas Chromatograph with Pulsed Discharge Helium Ionization Detector (PDHID)

Overview

The Huai Ai HA-9660-PDD Online Gas Chromatograph is an industrial-grade, continuously operating analytical system engineered for trace-level impurity quantification in high-purity process gases. It employs pulsed discharge helium ionization detection (PDHID), a universal, non-destructive detection principle that provides exceptional sensitivity—down to sub-ppb levels—for permanent gases (e.g., H₂, O₂, N₂, CH₄, CO, CO₂) and light hydrocarbons without requiring catalytic conversion or flame-based excitation. Unlike conventional TCD or FID configurations, PDHID operates under controlled helium plasma conditions, enabling stable baseline performance and minimal matrix interference in ultra-high-purity environments such as semiconductor-grade nitrogen, argon, hydrogen, and specialty electronic gases. The instrument integrates a precision temperature-controlled oven, electronically regulated carrier gas delivery, and a dedicated sample introduction module—all housed in a ruggedized 5U 19-inch rack-mount chassis suitable for deployment in control rooms, skid-mounted analyzer shelters, or laboratory settings.

Key Features

• Ultra-low detection limit of ≤5 ppb for key impurities including H₂O, O₂, N₂, CO, CO₂, CH₄, and C₂H₂—validated per GB/T 28726-2012 and GB/T 28125.1-2011
• Embedded industrial PC controller with real-time OS, eliminating external computer dependency and ensuring deterministic timing for sequential valve actuation and detector signal acquisition
• Thermally optimized column oven with programmable ramp rates (1–40°C/min) and rapid cool-down (400°C → 50°C in ≤7 min), supporting multi-method scheduling across shifts
• Dual independent electronic pressure and flow controllers (EPC/EFC) for both carrier (He) and sample streams, delivering <±0.5% setpoint accuracy over full operating range
• Modular injector design rated to 400°C, compatible with split/splitless and gas sampling valve configurations; accommodates 1/4″ Swagelok stainless-steel sample inlet and 1/8″ Swagelok carrier gas interface
• RS-232/RS-485 serial interface compliant with Modbus RTU protocol for seamless integration into DCS, SCADA, or MES platforms with configurable polling intervals and alarm thresholds

Sample Compatibility & Compliance

The HA-9660-PDD is validated for direct analysis of gaseous matrices with purity ≥99.999% (5N), including but not limited to electronic-grade nitrogen, argon, helium, hydrogen, oxygen, and synthesis gas streams. Its PDHID response is linear across six orders of magnitude (5 ppb – 10,000 ppm), meeting the dynamic range requirements specified in ISO 8573-5 for compressed air purity class 1 testing and ASTM D1946 for hydrocarbon analysis in industrial gases. As a co-drafting entity of GB/T 28726-2012 and GB/T 28125.1-2011, Huai Ai’s method validation packages include certified reference gas calibration protocols, retention time locking procedures, and long-term stability reports required for GLP-compliant laboratories and GMP-regulated manufacturing sites. All firmware and control logic are designed to support audit trails, user access levels, and electronic signature functionality aligned with FDA 21 CFR Part 11 principles.

Software & Data Management

The embedded chromatography data system (CDS) provides intuitive web-accessible configuration via Ethernet (optional) or local serial console. Users define multi-segment temperature programs, configure valve switching sequences, assign peak identification libraries, and schedule automated calibration runs—all without third-party software dependencies. Raw detector signals are digitized at 20 Hz with 16-bit resolution and stored in vendor-neutral CSV format with timestamped metadata (oven temp, carrier flow, detector voltage, valve status). Data export supports FTP push, Modbus register mapping, and OPC UA gateway integration. Audit logs record all parameter modifications, run starts/stops, and user logins with UTC timestamps—enabling full traceability during regulatory inspections.

Applications

• Air separation units: Continuous monitoring of hydrocarbon buildup in liquid oxygen storage systems per GB/T 28125.1-2011
• Electronics manufacturing: In-line verification of dopant gas purity (e.g., PH₃, SiH₄, B₂H₆) prior to CVD/PVD tool delivery
• Chlor-alkali plants: Detection of chlorine, hydrogen, and oxygen cross-contamination in membrane cell off-gas
• Photovoltaic silicon production: Quantification of metal hydrides (e.g., AsH₃, PH₃) and boron-containing species in silane feedstock
• Cryogenic logistics: Real-time quality assurance during LNG or liquid nitrogen tanker loading/unloading operations
• Aerospace propulsion testing: Trace moisture and particulate-derived volatiles in high-pressure helium purge lines

FAQ

What carrier gas is required for PDHID operation?
Helium (≥99.999% purity) is mandatory. Impurities such as nitrogen, oxygen, or moisture degrade plasma stability and increase baseline noise.
Can the HA-9660-PDD be integrated into a plant-wide DCS?
Yes—via RS-485 Modbus RTU interface with configurable slave ID, register mapping, and polling intervals from 1 second to 10 minutes.
Is method transfer possible between laboratory GCs and the HA-9660-PDD?
Retention time locking (RTL) and standardized column dimensions (e.g., 30 m × 0.32 mm ID × 1.0 µm film) enable robust inter-instrument reproducibility when using identical stationary phases.
Does the system support automatic calibration?
Yes—programmable sequence includes zero gas injection, span gas injection, and multi-point calibration curves with R² ≥0.999 validation.
What maintenance intervals are recommended for uninterrupted online operation?
Detector cleaning every 6 months; column reconditioning every 12 months; EPC filter replacement every 24 months—documented in the included PM checklist compliant with ISO/IEC 17025 preventive maintenance guidelines.