Huayun HY-4000 Dynamic Gas Mixing System
| Brand | Huayun Instruments |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | OEM Manufacturer |
| Region Category | Domestic (China) |
| Model | HY-4000 |
| Price | USD 4,200 (FOB Beijing) |
| Gas Mixing Ratio Range | 0.1–99.9% of source gas |
| Output Flow Rate | 600 mL/min |
| Mixing Accuracy | ±1% |
| Linearity Error | ±1% |
| Repeatability | ±1% |
| Response Time | ≤5 s |
| Output Pressure | 34 kPa |
| Operating Temperature | 0–50 °C |
| Dimensions | 240 × 300 × 120 mm |
| Weight | 1.8 kg |
Overview
The Huayun HY-4000 Dynamic Gas Mixing System is a precision-engineered, microprocessor-controlled gas dilution instrument designed for the on-demand generation of certified reference gas mixtures in laboratory, calibration, and environmental monitoring applications. It operates on the principle of dynamic mass flow blending—using two independent thermal mass flow controllers (MFCs) to precisely regulate the volumetric flow rates of a primary source gas (e.g., CO, NO, SO₂, NH₃, or VOC standard) and a balance carrier gas (typically high-purity nitrogen or synthetic air). By maintaining real-time proportional control over both streams, the system generates stable, traceable gas concentrations ranging from 0.1% to 99.9% of the source gas concentration—without reliance on pre-filled calibration cylinders. This enables continuous, reproducible delivery of working standard gases at 600 mL/min, with response stabilization within 5 seconds and output pressure regulated at 34 kPa (±0.5 kPa). The HY-4000 is engineered for metrological integrity in settings requiring adherence to ISO/IEC 17025, ASTM D6196, EPA Method TO-15, and EN 14662-compliant calibration protocols.
Key Features
- High-accuracy dual-channel thermal mass flow control with factory-calibrated MFCs traceable to NIST standards
- Intuitive 4.3-inch TFT LCD interface with full Chinese menu navigation and numeric keypad input for rapid concentration setup
- Automated sequential mode: programmable timer-based generation of up to six discrete concentration levels without manual intervention
- Zero-waste gas utilization architecture—100% of the source gas is consumed during mixing; no venting or bypass losses
- Compact benchtop footprint (240 × 300 × 120 mm) and lightweight design (1.8 kg) optimized for space-constrained QC labs and mobile calibration units
- Robust aluminum alloy chassis with EMI-shielded electronics and internal pressure regulation to ensure long-term stability under variable ambient conditions (0–50 °C)
Sample Compatibility & Compliance
The HY-4000 supports binary gas mixing of any chemically compatible pair—including reactive, corrosive, or condensable species—provided inlet gas purity meets ≥99.999% (5N) specifications and dew point remains below −40 °C. Compatible source gases include but are not limited to: carbon monoxide (CO), nitrogen oxides (NO/NO₂), sulfur dioxide (SO₂), ozone (O₃), ammonia (NH₃), methane (CH₄), and selected volatile organic compounds (VOCs) when delivered via permeation tubes or certified cylinder standards. All internal wetted materials (316L stainless steel, Kalrez® seals, electropolished tubing) comply with USP Class VI and FDA 21 CFR Part 11 requirements for material compatibility and extractables profiling. System validation documentation includes as-delivered accuracy reports, linearity verification curves, and repeatability test logs per ISO 6145-2.
Software & Data Management
While the HY-4000 operates autonomously via its embedded firmware, optional RS-232/USB connectivity enables integration with external LIMS or calibration management software (e.g., LabWare, Thermo Fisher SampleManager). All mixing parameters—including setpoints, actual flow values, timestamps, and error flags—are logged internally with non-volatile memory retention for ≥12 months. Audit trails meet GLP/GMP data integrity requirements: each record contains operator ID, event type, parameter change, and digital signature timestamp. Firmware updates are performed via secure signed .bin files; configuration backups support ISO/IEC 17025 clause 7.7 traceability requirements.
Applications
- Primary and secondary calibration of fixed-location and portable gas analyzers (e.g., UV-DOAS, FTIR, electrochemical sensors, PID detectors)
- Verification and drift testing of continuous emission monitoring systems (CEMS) per EPA Performance Specification 2 and EN 15267
- Preparation of intermediate standard gases for GC-FID, GC-MS, and IC analyses in environmental and occupational hygiene laboratories
- Method validation studies requiring multi-level concentration gradients (e.g., linearity assessment per ISO 11843-7)
- On-site field calibration of air quality sensor networks where cylinder logistics are prohibitive
FAQ
Can the HY-4000 mix more than two gases simultaneously?
No—the HY-4000 is a binary dynamic mixer. For multi-component blends, sequential mixing or cascaded configurations using multiple units are required.
Is the system suitable for use with hydrogen or acetylene?
Hydrogen may be used with appropriate safety interlocks and leak-tested fittings; acetylene is not recommended due to decomposition risk under pressure and regulatory restrictions.
Does the device require annual recalibration?
Yes—annual recalibration against certified reference standards is recommended per ISO/IEC 17025 Clause 6.5 and manufacturer specifications to maintain ±1% accuracy claims.
What maintenance intervals are specified for the mass flow controllers?
MFCs require quarterly zero-point verification and biannual full span calibration using traceable NIST-standard gases; filter elements should be replaced every 6 months in high-particulate environments.
Can the HY-4000 generate ppm- or ppb-level concentrations?
Not directly—the system’s 0.1–99.9% range refers to volumetric ratio of source gas in carrier. To achieve sub-100 ppm outputs, a pre-diluted source gas (e.g., 100 ppm CO in N₂) must be used as the primary input stream.
