ChemTron NMH2-1350plus High-Purity Hydrogen Generator for CVD Applications

Overview

The ChemTron NMH2-1350plus is a high-purity, on-demand hydrogen generator engineered specifically for demanding chemical vapor deposition (CVD), analytical instrumentation, and catalytic research applications. It employs dual-membrane proton exchange membrane (PEM) electrolysis technology—integrating proprietary CPEM (Composite Proton Exchange Membrane) and CCELL (Corrosion-resistant Titanium Cell) architectures—to electrolyze ultrapure water without caustic electrolytes or consumable drying agents. Unlike traditional alkaline or metal-hydride systems, this generator delivers continuous, ultra-high-purity hydrogen at up to 1350 mL/min and 11 bar (160 psig), with no thermal byproduct generation during electrolysis and zero pure water waste. Its internal gas holdup is strictly limited to <50 mL—well below the 4% lower explosive limit (LEL) threshold—ensuring intrinsic safety in laboratory and cleanroom environments. The NMH2-1350plus meets stringent requirements for inert carrier and reactive feed gas in semiconductor fabrication, surface science, and trace-level GC/MS analysis where background contamination, pressure stability, and long-term reliability are non-negotiable.

Key Features

• Ultra-high hydrogen purity certified at 99.99996% (6.6 N) by independent third-party testing—validated per ISO 8573-1:2010 Class 1 for particulates, moisture, and hydrocarbon content
• CCELL electrolyzer housing fabricated from ASTM Grade 2 titanium, eliminating metallic leaching and catalytic side reactions common with stainless-steel or nickel-based cells
• CPEM membrane reinforced with platinum- and platinum-iridium alloy catalyst layers, enabling stable operation at low overpotential and extended service life (>15,000 operating hours)
• Triple-stage purification: (1) PEM-selective H₂ separation, (2) static hydrophobic membrane drying (no desiccant regeneration), and (3) dual-stage cold-regenerative purifier—resistant to volatile organic compounds (VOCs) and ambient lab contaminants including fragrance volatiles
• Comprehensive real-time monitoring: integrated conductivity sensor (water quality), capacitive level sensor (2.5 L reservoir), dual-point temperature sensing (electrolyzer stack), voltage/current profiling, seismic/vibration detection, and dual-pressure fault logic (internal leak + external delivery pressure loss)
• Fail-safe architecture: automatic shutdown on low water level, high water conductivity (>1 µS/cm), overtemperature (>65°C), overpressure (>11.5 bar), or power anomaly; outlet overpressure relief valve compliant with PED 2014/68/EU
• CE, CSA C22.2 No. 61010-1, and FCC Part 15 compliance; designed and validated for GLP/GMP-aligned laboratories requiring audit-ready operational logs

Sample Compatibility & Compliance

The NMH2-1350plus is compatible with all standard laboratory-grade ultrapure water sources meeting ASTM D1193 Type I or ISO 3696 Grade 1 specifications (resistivity ≥5 MΩ·cm at 25°C). It is routinely deployed in ISO Class 5–7 cleanrooms for CVD precursor delivery, ICP-MS hydrogen reaction gas, GC-FID/FPD carrier and fuel gas, and PEM fuel cell test benches. The system complies with key international standards including ISO/IEC 17025:2017 (for calibration traceability of flow and pressure sensors), USP (gas purity for pharmaceutical analysis), and FDA 21 CFR Part 11 when paired with optional PC software (audit trail, electronic signatures, and role-based access control enabled). No hazardous chemicals, compressed gas cylinders, or scheduled dry-purge cycles are required—reducing facility qualification burden and simplifying regulatory documentation.

Software & Data Management

Optional ChemTron ControlSuite™ PC software provides full remote configuration, real-time telemetry (flow, pressure, water conductivity, temperature, alarm history), and secure data logging compliant with 21 CFR Part 11 Annex 11. The software supports time-stamped event logging with immutable records, user-defined alarm thresholds, and automated report generation (PDF/CSV). When configured for multi-unit deployment, the system enables synchronized cascade control: up to eight NMH2-1350plus units can be networked via RS485 or Ethernet; upon failure of any unit, remaining generators dynamically redistribute total demand while maintaining setpoint accuracy within ±2% of target flow. Firmware updates are delivered digitally with cryptographic signature verification and rollback capability.

Applications

• Chemical vapor deposition (CVD) and atomic layer deposition (ALD) as reducing agent and purge gas in semiconductor, photovoltaic, and MEMS fabrication
• Gas chromatography (GC) and GC-MS: carrier gas (constant pressure/flow mode), detector fuel gas (FID, FPD, NPD), and make-up gas—eliminating baseline drift and column degradation associated with cylinder-derived impurities
• Inductively coupled plasma mass spectrometry (ICP-MS): hydrogen reaction gas for collision/reaction cell (CRC) chemistry (e.g., H₂ mode for As, Se, Cl interference removal)
• Hydrogenation reactors and catalytic screening platforms requiring precise, pulse-free H₂ delivery under programmable pressure ramping
• Fuel cell R&D test stations requiring stoichiometric, low-dew-point hydrogen with <0.1 ppm CO and <1 ppb total hydrocarbons
• Deuterium gas generation (via isotopic water feed) for neutron scattering and NMR reference applications

FAQ

What is the maximum allowable feed water conductivity?
The system requires feed water with conductivity ≤0.2 µS/cm (≥5 MΩ·cm resistivity). Operation above 1.0 µS/cm triggers automatic water inlet cutoff and visual/audible alarm.
Does the generator require periodic electrolyte replenishment or membrane replacement?
No. The CPEM/CCELL architecture uses solid polymer electrolyte—no KOH or H₂SO₄ solutions are used, and the membrane is rated for >15,000 hours under nominal load.
Can the NMH2-1350plus be integrated into an existing hydrogen piping network?
Yes. It features 1/8″ Swagelok® VCR-compatible outlet and built-in back-pressure regulation; it may be safely paralleled with cylinder banks using optional check-valve manifolds.
Is the hydrogen output suitable for use in flame ionization detectors (FID)?
Yes. Certified 99.99996% purity includes <0.1 ppm CO, <0.05 ppm CH₄, <1 ppb total hydrocarbons, and dew point ≤–70°C—fully compliant with ASTM D7217 and IUPAC GC detector gas specifications.
What maintenance is required during the first two years?
None beyond quarterly visual inspection and annual conductivity sensor calibration using NIST-traceable standards; all firmware, calibration, and preventive maintenance are covered under the included 2+1 year comprehensive warranty.