AlyTech's NOMAD system integrates GasMix™ dynamic dilution technology into a portable architecture compliant with the ISO 6145-7 standard.
Designed for in-situ operation, the device enables calibration and metrological validation of gas analyzers in mobile laboratories, monitoring stations (CEM), and remote industrial sites.
Technical and Metrological Specifications
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Set Point Accuracy: (operating range 10-100% FS)
Repeatability: (operating range 10-100% FS)
- Traceability: NIST (National Institute of Standards and Technology) reference
- Compensation: Automatic calculation and correction of the K-factor for various gas matrices (He, Ar, CH₄, H₂, N₂, Air, etc.)
- Issuance of concentration certificates with automatic calculation of metrological uncertainty.
Hardware Configuration and Operation
A standard hardware configuration includes four gas input channels, allowing the simultaneous connection of two span gases (concentrates), an interference gas, and a dilution gas (zero/matrix).
This configuration supports the execution of complex analytical procedures, such as:
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Multi-point calibrations (linearity curve)
- Span and zero checks
- Repeatability checks
- Purity and interference tests
- Sequence execution using custom script software.
Software and Interfaces
System control is managed via the GasMix™ software application, installed on the integrated IPC with a Windows environment, or accessible from an external computer via an Ethernet interface.
Software Features:
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Flow Management: Automatic calculation of dilution/mixture flows from target concentrations, based on stored MFC calibration tables.
- Automation: Execution of user-programmed sequences and synchronization (manual or automatic) with external gas analyzers.
- Storage: Integrated library for gas standards, MFC calibration tables, and user profiles.
- Data Management: Project-based workflow implementation and comprehensive audit trails for QA/QC traceability.
Mass Flow Controller (MFC) Features
Each MFC integrator undergoes a 400-point factory calibration across the full scale (F.S.), specific to each selected gas matrix. This process ensures optimal linearity and accuracy, which are particularly critical at the lower and upper limits of the operating range.