High-Accuracy Gas Flow Standard Device with 0.3% Uncertainty (DN15–DN300)
Accurate gas flow measurement is critical in industries such as natural gas, petrochemical, power generation, and industrial gas systems. It directly impacts custody transfer accuracy, energy efficiency, process stability, and regulatory compliance.
To achieve high-precision, stable, and traceable calibration, Kaifeng Xinya Instrument Co., Ltd. introduces:
LQB-301 Sonic Nozzle Gas Flow Calibration System
A fully automated calibration solution based on ISO 9300, designed for DN15–DN300 flow meters.
Why Gas Flow Calibration Systems Are Essential
Gas flow meters are widely used in:
Natural gas custody transfer / Petrochemical process control / Industrial energy measurement / Environmental monitoring
Without proper calibration, users may face:
❌ • Measurement errors → billing disputes / ❌ • Data deviation → inaccurate energy accounting / ❌ • Process instability → operational risks / ❌ • Non-compliance → failure in metrology inspection
A gas flow calibration system is therefore essential for both metrology institutes and industrial users.
Measurement Principle (Sonic Nozzle Method – ISO 9300)
The system uses critical flow Venturi nozzles (sonic nozzles) as the reference standard.When the gas reaches critical flow conditions:
Velocity at the nozzle throat reaches sonic speed (Mach 1) / Flow rate depends only on upstream pressure, temperature, and nozzle geometry / Independent of downstream pressure fluctuations
This ensures: ✔ High stability ✔ Excellent repeatability ✔ Fully traceable measurement results. By comparing the reference flow with the meter under test, the system evaluates:
Measurement error / Repeatability / Linearity
Certified Accuracy & Traceability (CNAS Recognized)
The LQB-301 system has been calibrated by the Henan Institute of Metrology, with CNAS-recognized certification. Verified performance:
Flow range: 1.0 – 6500 m³/h / eter size: DN15 – DN300 / Flow stability: 0.10% / Expanded uncertainty: 0.3% (k=2) / Nozzle accuracy class: Class 0.2
Suitable for laboratory standards, metrology certification, and industrial calibration
Design Standards & Compliance
The system is designed in accordance with:
• ISO 9300 / GB/T 21188 / • JJF 1240 (Calibration Specification) /•JJG 620 (Sonic Nozzle Verification) /•JJG 643 (Flow Standard Device) / •JJG 1037 / 1029 / 1030
Fully compliant with international and national metrology requirements
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Specification |
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LQB-301 |
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1.0～6500 m³/h |
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0.3% (k=2) |
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0.10% |
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DN15～DN300 |
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83～101 kPa |
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Clean / compressed air |
Key Components (Industrial-Grade Configuration)
• Pressure transmitter: Rosemount 3051TA (0.1% accuracy) / • Temperature transmitter: Rosemount 644H / • Sonic nozzle group: Class 0.2 high-precision nozzles / • Stagnation & back-pressure tanks / • Fully automatic calibration software (.NET + C# + SQLite)
Proven configuration for real industrial delivery, not conceptual design
Key Advantages
Traceable High Accuracy • Certified by metrology institute (CNAS recognized) • System uncertainty: 0.3% (k=2) • Automatic temperature & pressure compensation
Wide Flow Range Coverage • 1.0 – 6500 m³/h • DN15 – DN300 full coverage • Multi-nozzle flexible combination
Fully Automated Calibration • Automatic flow control • Data acquisition & processing • Automatic report generation Improves efficiency and reduces human error
Robust Industrial Design • Parallel pipeline structure for multi-meter testing • Stainless steel piping system • Low noise operation (≤55 dB optional)
Low Maintenance & High Reliability • No moving parts • Modular structure • Long-term stable operation
Applications
Metrology and Verification Institution — New Product Type Approval Appraisal, Initial Verification, Periodic Verification, Arbitration Verification, and Supervision Sampling Inspection.
Gas Flowmeter Manufacturer — Factory Acceptance Verification, Performance Commissioning, Quality Control, and Type Evaluation Test.
Widely used in: • Metrology institutes (verification & certification) • Flow meter manufacturers (factory calibration) • Oil & gas / petrochemical industries • Power plants and energy systems • City gas companies • Universities and research institutions
Universities and Scientific Research Institutes — Flow Metrology Research, Experimental Testing, Teaching and Practical Training, and Equipment Development.
Manufacturer Strength – XINYA INSTRUMENT
Kaifeng Xinya Instrument Co., Ltd. is a professional manufacturer with: • 26,000 m² production facility • In-house R&D and manufacturing capabilities • Complete system integration experience
We provide:
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