Gas Distribution System, purified to <5 ppb moisture.

Introduction

The Gas Distribution System is a turnkey solution designed to supply ultra-pure gases — Zero Air (ZA), Nitrogen (N2), Hydrogen (H2), Helium (He), and Methane (CH4) — from high-pressure cylinders to laboratory instruments with precision, safety, and uninterrupted operation. It integrates automatic cylinder changeover, multi-stage purification, point-of-use regulation, stainless-steel distribution, and real-time gas detection into a modular, scalable assembly that fits neatly into standard panel layouts.

Auto changeover manifold

• Automatic switching: a pilot-operated valve senses when the primary cylinder bank pressure falls below a preset threshold, triggering an uninterrupted switch to the standby bank.
• Zero manual intervention: maximizes gas usage and eliminates the need for operators to monitor cylinder pressure continuously.
• Bank configuration: five dual-cylinder changeover banks serve the ZA, N2, H2, He and CH4 lines with an additional spare purification module.

Multi-stage purification trains

Each gas stream flows through cartridge-type traps housed in SS 304 panels with quick-release clamps for rapid element changes:

• Desiccant stage: lowers moisture to <5 ppb.
• Carbon bed: removes hydrocarbons to <15 ppb.
• Oxygen scavenger: ensures residual O2 <1 ppb.

Point-of-use regulation

Ultra-miniature, single-stage SS 316L regulators positioned at instrument inlets maintain stable 0–100 psi pressures. Their diaphragm-sensed design and integrated 10 µm mesh filters deliver contaminant-free gas with optimized flow characteristics, and integrated shut-off valves allow safe line isolation for maintenance.

Distribution network

• Electropolished tubing: leak-tight SS 316/316L tubing (¼″×0.035″, ⅝″×0.028″) ensures smooth, inert flow with minimal dead volume.
• Compression fittings: tees, unions, and reducers provide versatile routing across the full-layout drawing.
• Flexible braided hoses: custom-length pigtails and SS-braided hoses accommodate movement and vibration isolation.
• Leak testing: all connections undergo helium leak testing to <1×10−9 mbar·L/s.

Gas detection & safety

An ATEX/CE-certified, 16-channel multi-channel detector panel monitors O2, combustibles, and toxic gases via SS 316 transmitter heads housed in cast-aluminum LM-6, IP66-rated enclosures rated for Gas Groups IIA/IIB. The panel provides 4–20 mA outputs, programmable relays, and RS-485 Modbus communications with visual/audible alarms, enabling automated shutdown upon hazardous conditions.

Panel assembly

Enclosures are powder-coated MS, built per the full-layout drawing with standardized 600 × 400 mm frame sizes, knock-outs, and adjustable mounting rails. Regulators, dual-scale gauges, relief valves, and isolation valves are ergonomically arranged for visibility and maintenance access.

Bill of materials (excerpt)

Technical specifications

Conclusion

The system delivers a highly reliable, safe, and modular platform for distributing multiple ultra-pure gases in demanding R&D and analytical environments. Its automated changeover, advanced purification, localized regulation, and integrated safety controls ensure continuous, contamination-free supply tailored to evolving laboratory needs.