Zhongkehuifen HF-901 Gas Chromatograph

Overview

The Zhongkehuifen HF-901 Gas Chromatograph is a laboratory-grade, general-purpose analytical instrument engineered for precision separation and quantitative analysis of volatile and semi-volatile organic compounds, inorganic gases, and light hydrocarbons. Based on the fundamental principle of differential partitioning between a mobile phase (inert carrier gas) and a stationary phase (capillary or packed column), the HF-901 delivers high-resolution chromatographic separations under tightly regulated thermal and pneumatic conditions. Its design adheres to core performance criteria outlined in ISO 17025-accredited testing environments and supports method development compliant with ASTM D3612, EPA Method 8260/8021, and USP . The system integrates electronic pressure and flow control (EPC) across all gas channels—injector, column oven, and detector—to ensure retention time stability, peak symmetry, and inter-run reproducibility essential for routine QC and regulatory submissions.

Key Features

• Full EPC architecture with digital pneumatic control: independent, real-time regulation of carrier gas pressure (0–970 kPa) and total flow (0–1200 mL/min) at injector and detector modules, achieving pressure resolution ≤0.01 psi (0.689 kPa) and flow repeatability ≤0.5% RSD.
• Thermally optimized oven system: temperature programmable from 4°C (below ambient, with optional cryo-cooling accessory) to 450°C, with ramp rates adjustable from 0.1 to 80°C/min and rapid cool-down (~6 minutes from 450°C to 50°C) enabled by dual-zone air circulation and optimized thermal mass distribution.
• 7-inch industrial-grade color TFT-LCD touchscreen interface: supports dual-language operation (English/Chinese), intuitive graphical navigation, and local instrument control without external PC dependency.
• Embedded 10/100M adaptive Ethernet port with integrated TCP/IP stack: enables seamless integration into enterprise LANs, remote monitoring via standard web browsers, and secure firmware updates over HTTPS.
• Modular detector compatibility: configurable with FID, TCD, ECD, FPD, and NPD detectors—each equipped with dedicated EPC-controlled gas supplies and temperature-regulated housings meeting IEC 61000-6-3 EMC standards.
• Auto-sampler ready architecture: built-in driver support for third-party liquid/gas auto-samplers (e.g., CTC PAL, Gerstel MPS), including TTL-triggered injection synchronization and sequence-based valve actuation.

Sample Compatibility & Compliance

The HF-901 accommodates a broad range of sample matrices—including petroleum distillates, environmental water/soil extracts, food volatiles, pharmaceutical residual solvents, and clinical headspace gases—via split/splitless, on-column, or PTV injection modes. All hardware components meet RoHS Directive 2011/65/EU requirements. Software functionality complies with data integrity principles per FDA 21 CFR Part 11, supporting role-based user authentication, electronic signatures, immutable audit trails, and full revision history for all method parameters, sequence logs, and raw data files. System validation documentation aligns with IQ/OQ/PQ protocols recommended by ASTM E2500 and EU Annex 11.

Software & Data Management

The instrument is operated and managed through iBrainChrom Workstation—a validated, multi-instrument chromatography data system (CDS) supporting up to 253 concurrent GC channels. It provides full bidirectional instrument control, real-time chromatogram visualization, peak integration using ISO 14155-compliant algorithms, calibration curve generation (linear, quadratic, weighted), and customizable report templates exportable to PDF, CSV, or LIMS-compatible XML. The software implements Modbus RTU protocol for direct communication with distributed control systems (DCS) and SCADA platforms. All data files are stored in vendor-neutral .CDF format (compatible with OpenChrom and Chromeleon readers), and database backups follow AES-256 encryption standards.

Applications

The HF-901 serves as a primary analytical platform in accredited laboratories conducting: hydrocarbon speciation in gasoline and diesel per ASTM D6730; pesticide residue screening in fruits/vegetables per GB 23200.113; VOC profiling in indoor air per ISO 16000-6; residual solvent quantification in APIs per ICH Q2(R2); and trace sulfur compound detection in natural gas per ISO 6974. Its robustness and method transfer capability make it suitable for both teaching laboratories (undergraduate chromatography courses) and contract research organizations performing GLP-compliant environmental fate studies.

FAQ

Does the HF-901 support unattended overnight operation?
Yes—the system supports scheduled run sequences, automatic shutdown routines, and event-triggered alerts via email/SNMP traps when pressure deviations or flame-out events occur.
Can the instrument be integrated into an existing LIMS environment?
Yes—iBrainChrom provides ODBC-compliant database connectivity and HL7/ASTM E1384 message mapping for bidirectional sample registration and result reporting.
Is GMP-compliant audit trail functionality included by default?
Yes—all user actions, method modifications, and data processing steps are timestamped, attributed, and cryptographically hashed in accordance with ALCOA+ principles.
What is the minimum detectable concentration for benzene using FID?
Typical MDL is ≤0.05 ng on-column under optimized splitless conditions with a 30 m × 0.25 mm × 0.25 µm DB-5ms column and helium carrier gas at 1.2 mL/min.
Are column oven cooling accessories available for sub-ambient operation?
Yes—an optional Peltier-cooled oven insert extends the lower temperature limit to –20°C, enabling cryo-focusing for trace VOC analysis.