AlyTech NEPHOS Liquid-to-Gas Dynamic Dilution System
| Brand | AlyTech |
|---|---|
| Origin | France |
| Model | NEPHOS |
| Liquid Channels | 1 or 2 |
| Liquid Flow Range | 0.5–5 g/h and 0.5–200 g/h |
| Liquid Compatibility | Pure liquids or homogeneous liquid mixtures (e.g., water, organic solvents) |
| Gas Channels | 1–6 |
| Inlet Pressure | 3 bar (max 8 bar) |
| Compatible Gases | High-purity gases, concentrated standards, most corrosive and reactive gases (custom validation required for specialty gases) |
| Max Dilution Ratio | 1:10⁸ |
| Output Flow Accuracy | < ±2% of reading |
| Output Concentration Accuracy | < ±1% |
| Heated Transfer Line | Standard 1 m (custom lengths available) |
| Outlet Pressure | Ambient (higher pressure options on request) |
| Fitting Interfaces | Swagelok 1/8", 1/16", and 1/4" |
| Operating Temperature | 10–50 °C |
| Power Supply | 90–260 VAC, 1.5–4 A, 50–60 Hz |
| Dimensions (H×W×D) | 50 × 47 × 58 cm |
| Weight | 25–40 kg (configuration-dependent) |
| Communication | Ethernet, Windows 10+ PC host |
| Software | AlyTech LiqMix™ v3.x (NIST-traceable MFC & Coriolis calibration |
Overview
The AlyTech NEPHOS is a high-precision, fully automated liquid-to-gas dynamic dilution system engineered for the reproducible generation of trace-level and percent-range standard gas mixtures directly from pure liquids or pre-formulated liquid blends. Unlike static permeation or diffusion-based generators, NEPHOS employs a dual-technology flow control architecture: Coriolis-based liquid mass flow measurement coupled with thermally compensated thermal mass flow controllers (MFCs) for carrier and diluent gases. This enables real-time, stoichiometric vaporization and mixing under precisely regulated temperature and pressure conditions. The system operates on the principle of controlled flash evaporation—where liquid is metered at sub-milligram resolution, heated to a user-defined saturation temperature, and entrained into a primary carrier stream. Subsequent dilution stages (up to six total gas channels) allow multi-step concentration attenuation, enabling stable output concentrations spanning eight orders of magnitude—from parts-per-quadrillion (ppq) equivalent to percent-level vol/vol—with full metrological traceability to NIST-certified calibrations.
Key Features
- Modular architecture supporting 1 or 2 independent liquid channels and up to 6 gas inlets—scalable via field-upgradable hardware modules
- Coriolis liquid flow sensors with intrinsic insensitivity to fluid density, viscosity, temperature, and conductivity—ensuring consistent performance across water, methanol, acetone, chlorinated solvents, and other volatile organics
- Heated stainless-steel transfer lines (standard 1 m, maintained at user-set temperature > dew point) to prevent condensation, wall adsorption, or phase separation
- All-wetted surfaces electropolished and passivated per ASTM A967—compatible with HCl, Cl₂, NH₃, H₂S, NOₓ, SO₂, and other aggressive species (material compatibility verification recommended for each application)
- Automated liquid supply management including priming, flushing, and residual purge cycles—minimizing carryover and cross-contamination between sequences
- Integrated pressure regulation and back-pressure control for stable outlet delivery at ambient pressure or configurable overpressure (optional)
- Self-diagnostics and real-time fault logging compliant with ISO/IEC 17025 quality system requirements
Sample Compatibility & Compliance
NEPHOS accommodates a broad spectrum of volatile and semi-volatile compounds dissolved in inert or reactive liquid matrices—including aqueous standards, VOC cocktails in methanol, halogenated reference solutions, and custom-formulated calibration blends. Liquids must be free of suspended particulates, non-volatile residues, or precipitation-prone salts to ensure uninterrupted Coriolis sensor operation and nozzle integrity. The system meets CE marking requirements for electromagnetic compatibility (EMC Directive 2014/30/EU) and low voltage (LVD Directive 2014/35/EU). All factory calibrations are performed using NIST-traceable reference standards and documented per ISO/IEC 17025:2017. For regulated environments, LiqMix™ software supports 21 CFR Part 11 compliance through electronic signatures, role-based access control, immutable audit trails, and automated backup of all sequence parameters, run logs, and calibration certificates.
Software & Data Management
LiqMix™ is a dedicated Windows-based control and data acquisition platform developed by AlyTech for method-driven gas standard generation. It provides a graphical sequence editor for constructing multi-step dilution protocols—including ramped concentration gradients, multi-point calibration curves, dynamic atmosphere generation, and timed valve actuation for instrument synchronization. Each sequence stores complete metadata: liquid lot numbers, gas cylinder IDs, environmental conditions (T/P), flow setpoints, real-time deviation alerts, and raw sensor outputs. Data export is supported in CSV, XML, and PDF formats compatible with LIMS integration. The software maintains a full revision history of all method changes and enforces user authentication for critical operations such as calibration updates or firmware upgrades. Remote monitoring and troubleshooting are enabled via secure Ethernet connection with TLS 1.2 encryption.
Applications
- Multi-point calibration of GC-FID, GC-MS, PTR-TOF, SIFT-MS, and cavity ring-down spectrometers (CRDS)
- Linearity verification and limit-of-detection (LOD)/limit-of-quantitation (LOQ) studies per ISO 11843 and USP
- Dynamic atmosphere simulation for sensor testing, material outgassing studies, and catalytic reactor feed conditioning
- Preparation of certified reference materials (CRMs) for ambient air monitoring networks (e.g., EMEP, GAW)
- Hazardous gas exposure testing in occupational health laboratories under OSHA and EN 689 guidelines
- Method validation for EPA Methods TO-14A, TO-15, and ISO 16017-1 for VOC analysis
FAQ
Can NEPHOS generate gas standards containing multiple analytes simultaneously?
Yes—by leveraging two independent liquid channels and up to six gas inlets, NEPHOS supports co-evaporation of dissimilar compounds (e.g., benzene + formaldehyde in methanol) followed by orthogonal dilution and blending, enabling complex multi-component standards without physical mixing.
Is LiqMix™ compatible with third-party analytical instruments?
Yes—via TTL triggers, analog voltage signals, or TCP/IP commands, LiqMix™ synchronizes start/stop events and concentration transitions with GC autosamplers, pre-concentrators, FTIR cells, and real-time gas analyzers.
What maintenance intervals are recommended for Coriolis flow sensors?
No routine recalibration is required under normal operating conditions; however, annual verification against traceable liquid standards is advised for GLP/GMP environments. Sensor diagnostics are continuously monitored and logged within LiqMix™.
Does NEPHOS support humidified gas generation?
Yes—water can be introduced as the sole liquid component or co-evaporated with organics; relative humidity is controlled indirectly via liquid mass flow, carrier gas flow, and inline temperature stabilization.
Are custom interface fittings or extended heated lines available?
Yes—Swagelok 1/16”, 1/8”, and 1/4” configurations are standard; custom-length heated lines (up to 5 m), VCR fittings, and corrosion-resistant alloy wetted parts (Hastelloy C-276, Monel) are available upon request with lead-time consultation.
