Sonic nozzle calibration device under production

Sonic nozzle calibration systems provide highly accurate flow measurement verification for gas meters and industrial instrumentation.

These devices utilize critical flow nozzles that achieve choked (sonic) flow conditions, creating a constant mass flow rate independent of downstream pressure variations.

Modern systems feature:
• NIST-traceable calibration with ≤0.25% uncertainty
• Automated pressure/temperature compensation
• Wide flow range coverage (typically 1:10 turndown ratio)
• Compact modular designs for field or lab use

The laminar flow element design ensures Reynolds number independence above critical flow, while integrated PLC controls enable fully automated test sequences.

Applications include natural gas custody transfer verification, medical ventilator testing, and semiconductor process gas monitoring. Compared to traditional wet test methods,

sonic nozzle calibrators offer 3-5 times faster testing with superior repeatability. Advanced models incorporate dual-nozzle switching technology for

seamless range transitions and real-time data logging compliant with ISO 9300 standards.