Accurate gas composition analysis is critical in industries where process control, safety, and product quality depend on reliable measurements. The ASTG Model 5000 is engineered to deliver precise, continuous monitoring of binary gas mixtures, giving engineers and operators the confidence they need for high-stakes applications. By combining advanced acoustic measurement technology with a comprehensive thermodynamic database, the Model 5000 can characterize thousands of gas pairs with unmatched accuracy.
High-Precision Measurements for Demanding Applications
The Model 5000 measures gas composition with ppm-level resolution in both speed of sound and temperature, providing a typical mole-fraction accuracy of ±0.1%. This high-fidelity data is ideal for applications that require consistent, repeatable, and reliable gas analysis, whether in laboratories, process plants, or field environments
Validating Accuracy: Nitrogen–Hydrogen Testing
To demonstrate its precision, the Model 5000 was tested with nitrogen–hydrogen mixtures across a full concentration range. The experiment reflected real-world usage:
- The 130 cc acoustic cavity was initially filled with pure nitrogen.
- A controlled hydrogen flow of 20 sccm was introduced.
- The cavity was vented through a narrow tube to maintain atmospheric pressure and prevent backflow.
As hydrogen displaced nitrogen, the gas composition changed exponentially. Based on the system volume and flow rate, the theoretical time constant for this transition is:
During the test, the Model 5000’s software continuously logged mole fractions, producing data that closely matched the expected exponential behavior with exceptional precision.
Advanced Accuracy Verification
To check just how precise the Model 5000 is, we compared its measurements to a predicted mixing behavior of nitrogen and hydrogen. The results closely matched the expected values, with differences staying within ±0.1%, and only small, predictable changes during flow transitions.
For situations that demand extreme accuracy—near 0% or 100% gas concentration—the Model 5000 includes a “Rel” calibration feature. This lets operators set the current gas as a reference point, enabling mole-fraction accuracy as fine as ±10 ppm. This ensures reliable, high-precision measurements even in the most demanding applications.
Reliable, High-Fidelity Gas Composition Monitoring
The nitrogen–hydrogen validation highlights the Model 5000’s ability to deliver stable, repeatable, and highly accurate gas composition data across a full binary range. Its extensive thermodynamic database ensures reliable performance for thousands of gas mixtures, making it a versatile solution for:
- Process optimization
- Safety validation
- Quality assurance
Whether in industrial production, research laboratories, or field operations, the ASTG Model 5000 empowers operators with confidence, ensuring every measurement is precise, reliable, and actionable.