The AG Series CNG & LNG Coriolis Mass Flowmeters are VNERʼs dedicated solution for natural gas fueling and custody-related measurement, covering both Compressed Natural Gas (CNG) and Liquefied Natural Gas (LNG) applications.
Based on the Coriolis principle with precision-engineered vibrating tubes, the AG Series directly measures mass flow, density and temperature. When no fluid is flowing, the inlet and outlet tube oscillations are in phase; once flow starts, Coriolis forces generate a slight time-phase shift between the inlet and outlet signals, proportional to the mass flow rate. At the same time, the natural frequency is used to determine density, and integrated temperature sensors track process temperature.
With certified batch fueling accuracy up to ±0.50 % of reading, high-pressure and cryogenic-capable designs, and advanced gas/two-phase algorithms, the AG Series sets a new benchmark for CNG/LNG fueling, refueling stations and custody-related natural gas transfer.
Values below are based on the AG CNG015 and LNG006 / LNG025 models. Refer to the datasheet and local regulations for detailed sizing and approval information.
| Item | Description |
| Application focus | CNG and LNG fueling, refueling stations and custody-related metering |
| Measuring principle | Coriolis effect with controlled tube oscillation; phase shift proportional to mass flow |
| Measured variables | Mass flow, density, process temperature; calculated volume / standard volume (via transmitter) |
| Dedicated models | CNG015 (CNG); LNG006 (LNG vapour phase); LNG025 (LNG liquid phase) |
| Batch flow accuracy | ±0.50 % of reading (CNG015, LNG006, LNG025) under specified conditions |
| Batch flow repeatability | ±0.25 % of reading (CNG015, LNG006, LNG025) |
| Temperature accuracy | ±1.0 °C |
| Nominal flow (CNG015) | 6,000 kg/h (approx. 7,600 Nm³/h) |
| Nominal flow (LNG006) | 55 kg/h (vapour phase) |
| Nominal flow (LNG025) | 12,000 kg/h (liquid phase) |
| Zero stability | CNG015: 0.50 kg/h; LNG006: 0.60 kg/h; LNG025: 6.0 kg/h |
| Max. operating pressure | CNG015: 40.0 MPa; LNG006 / LNG025: 10.0 MPa (temperature-dependent) |
| Process temperature range | CNG015: -60...+150 °C; LNG006 / LNG025: -196...+100 °C |
| Ambient conditions | -40...+60 °C; 5–95 % RH non-condensing |
| Vibration limits | Up to 1.0 g acceleration, 5–2000 Hz (IEC 60068-2-6 / GB/T 2423.10 compliant) |
| Process pressure effects | LNG025: approx. -0.15 % of flow per MPa deviation from calibration pressure (typical) |
| Process temperature effects | LNG006 / LNG025: approx. ±0.0018 % of nominal flow per °C |
| Materials – wetted parts | Stainless steel 316 series |
| Materials – housings | Sensor housing: stainless steel 304 series; transmitter housing: epoxy-coated aluminium |
| Safety & approvals | Designed in accordance with GB/T 20801, GB 50316, TSG 07-2019 and ASME B31.3 |
| Explosion protection | Up to Ex db / Ex ib / Ex tb, IP66/7 (A-Series platform, see certificates) |
| Category | Specification / Option | Notes |
| Transmitter platform | A-Series full-digital transmitter | DSP-based signal processing and all-digital drive for ultra-low flow signals |
| Gas measurement | A-GASTM gas measurement algorithm | Ultra-high frequency resolution to minimise errors from low gas density and high velocity |
| Two-phase handling | MFDTM multi-frequency drive technology | Real-time multi-/variable-frequency tube excitation for improved stability under gas-liquid two-phase conditions (e.g. LNG boil-off) |
| Diagnostics | ILODTM intelligent instrument online diagnostics | NAMUR NE107-compliant diagnostic and event messages; supports predictive maintenance and lifecycle traceability |
| Pressure compensation | Fully automated online pressure compensation; semi-automatic via manual input | Allows real-time correction of process pressure deviations from calibration conditions |
| Safety features | Integrated automatic pressure relief (CNG) | Rupture disc for controlled venting in the unlikely event of housing failure; requires correct vent routing on site |
| Analog outputs | 4-20 mA | Assignable to main process variables |
| Pulse / frequency outputs | Up to 10 kHz pulse / frequency | For batch control and dispenser integration |
| Digital communication | Modbus RS485 as standard; support for additional fieldbus options via A-Series | Direct connection to dispensers, station controllers and SCADA systems |
| Installation options | Integral, extended-integral, remote or wall-mounted transmitter | Enables flexible mounting in confined CNG/LNG station layouts |
| Protection | Explosion-proof and dust-proof ratings up to Ex db IIC T6 Gb / Ex tb IIIC T80 掳C Db; IP66/67 | Certified for use in hazardous areas according to ATEX / IEC concepts (see marking for details) |
| Segment | Medium / Service | Typical Use |
| CNG fueling stations | High-pressure CNG | Mass-based metering in vehicle dispensers; batch fueling with custody-related accuracy |
| LNG vehicle fueling | LNG (liquid and vapour phase) | LNG dispenser metering for heavy-duty trucks and buses; loading/unloading at satellite stations |
| LNG bunkering & marine | LNG for marine engines | Measurement in ship bunkering skids and LNG-fueled vessel supply lines (within model limits) |
| Virtual pipeline & satellite stations | CNG and LNG | Mass flow measurement in trailer unloading, satellite station feed and regional distribution |
| City gas & industrial users | Natural gas supply points | Custody-related metering at industrial take-off points or city-gate study stations |
| Backup and peak-shaving systems | LNG peak-shaving facilities | LNG send-out metering and boil-off gas measurement in peak demand scenarios |
As China AG CNG/LNG Specialized Coriolis Mass Flowmeter Manufacturers and AG CNG/LNG Specialized Coriolis Mass Flowmeter Factory, we are renowned for manufacturing professional and high-precision industrial instruments. Our expertise lies in providing unparalleled flow measurement resources, backed by over 12 years of experience solving complex applications.
Our precision flow metering devices are used by a diverse range of users, ranging from major oil and gas companies to photovoltaic providers, pharmaceutical manufacturers, and municipal services. We continuously contribute to the development of flow measurement in the domestic energy and chemical industries due to our expertise in measuring variable component gases and peculiar mediums.
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+86-18652789521
+86-18052582295
+86-0514-83633600 / 83633900
+86-0514-83633600 / 83633900
No. 11 Xingye Road, Chenji Town Industrial Park, Yizheng, Yangzhou, China
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