GH-400 Hydrogen Generator by Zhongxing Huili

Overview

The GH-400 Hydrogen Generator is a compact, laboratory-grade alkaline electrolysis system engineered for continuous, on-demand hydrogen gas supply in analytical instrumentation applications. It operates on the principle of water electrolysis—using a potassium hydroxide (KOH) aqueous solution and a plate-type electrode stack to dissociate deionized water into high-purity H₂ and O₂ gases. Oxygen is safely vented, while hydrogen undergoes dual-stage purification before delivery at up to 300 mL/min and 0.3 MPa. Designed for integration with gas chromatographs (GC), GC–MS systems, and hydrogenation reactors, the GH-400 eliminates reliance on high-pressure cylinders, reducing operational risk, logistical overhead, and gas purity variability. Its robust architecture supports unattended 24/7 operation under ambient laboratory conditions (15–35 °C, <80% RH), with built-in thermal and pressure interlocks ensuring compliance with IEC 61010-1 safety standards for laboratory electrical equipment.

Key Features

• Plate-type alkaline electrolyzer cell: Optimized electrode surface area and uniform current distribution ensure stable output and extended service life (>5,000 operating hours typical).
• Automatic flow tracking control: Real-time adjustment of electrolytic current maintains precise H₂ delivery matching instrument demand—critical for GC carrier gas applications requiring consistent linear velocity.
• Dual-stage gas purification: First stage removes aerosolized KOH mist via coalescing filter; second stage employs desiccant (molecular sieve) to achieve dew point ≤ –40 °C and total hydrocarbon content <0.1 ppmv.
• Large-capacity electrolyte reservoir: Minimizes maintenance frequency—typical refill interval exceeds 3 months under continuous 200 mL/min operation.
• Integrated anti-backflow protection: Patented check-valve and level-sensing circuitry prevent alkaline electrolyte migration into downstream gas lines—a known failure mode in non-pressurized alkaline generators.
• Digital LED interface: Displays real-time flow rate (mL/min), system pressure (MPa), electrolyte level, and fault codes (e.g., low water, overpressure, temperature anomaly).

Sample Compatibility & Compliance

The GH-400 delivers hydrogen meeting ISO 8573-1:2010 Class 2:2:2 specifications for particle count, moisture, and oil content—suitable for use as carrier, fuel, or detector gas in GC-FID, GC-TCD, and microreactor environments. While not certified to UL or CE for standalone commercial deployment, its design adheres to key elements of GLP and GMP-aligned practices: audit-ready event logging (via optional RS-232 output), traceable calibration records, and mechanical fail-safes (pressure relief valve set at 0.35 MPa). The unit complies with Chinese national standard GB/T 36782–2018 for laboratory hydrogen generators and incorporates grounding, insulation resistance (>20 MΩ), and short-circuit protection per GB 4793.1.

Software & Data Management

The GH-400 operates as a stand-alone hardware system with no embedded firmware or cloud connectivity. All operational parameters are locally monitored via the front-panel digital display. For laboratories requiring data integration, an optional RS-232 serial interface enables passive readout of flow, pressure, and status codes into LIMS or SCADA platforms. No proprietary software is required; ASCII-formatted output supports direct parsing using standard terminal emulators or Python-based acquisition scripts. Audit trail functionality is limited to manual logbook entries—users implementing 21 CFR Part 11 compliance must supplement with external electronic lab notebook (ELN) systems for electronic signatures and change control.

Applications

• Carrier gas for capillary GC columns (including polar and PEG-based phases), where constant flow and ultra-low moisture prevent column degradation and baseline drift.
• Fuel gas for flame ionization detectors (FID), delivering stoichiometric H₂:air ratios without cylinder-induced pressure fluctuations.
• Reducing atmosphere generation in small-scale catalytic testing rigs and glovebox purging loops.
• Hydrogen feedstock in electrochemical cells and PEM fuel cell characterization setups requiring continuous low-flow supply.
• Calibration gas blending systems where stable, metered H₂ input is essential for dynamic dilution accuracy.

FAQ

What is the minimum inlet water quality requirement?
Deionized water with resistivity ≥15 MΩ·cm and TOC <50 ppb is mandatory. Tap or distilled water will cause rapid electrolyte contamination and membrane fouling.
Can the GH-400 be used with GC–MS systems?
Yes—provided the instrument’s manufacturer permits hydrogen as a carrier gas and the system includes a dedicated hydrogen-compatible vacuum pump and leak-tight manifold. Verify compatibility with your MS vendor prior to installation.
How often does the electrolyte require replacement?
Under normal operation (200 mL/min, 8 h/day), KOH solution should be replaced every 6–12 months. Visual inspection for discoloration or precipitate formation is recommended quarterly.
Is remote monitoring supported?
Only via optional RS-232 interface; no Ethernet, Wi-Fi, or IoT capabilities are included. Modbus or TCP/IP integration requires third-party protocol converters.
Does the unit include a hydrogen leak detection sensor?
No. Per IEC 60079-29-1, external hydrogen sensors (e.g., catalytic bead or electrochemical types) must be installed in the generator’s vicinity as part of the lab’s overall gas safety infrastructure.