Coriolis flow meters for hydrogen refueling (HRS)

The measurement relies on the Coriolis effect: the sensor tubes vibrate and the gas flow shifts their oscillation phase. The phase shift is proportional to the mass passing through the sensor, so the meter outputs kilograms directly — without density or compressibility corrections.

Stations refuel vehicles under the H35 (350 bar) and H70 (700 bar) protocols, while supply lines operate at pressures up to ~1,000 bar. The PK execution is rated for pressures up to 96 MPa (960 bar) — the H70 line is covered with margin.

For 70 MPa (700 bar) and 96 MPa (960 bar) stations, size 003..PK with a VCR connection is recommended: a wide U-shaped sensor, H₂-embrittlement resistant materials and high-pressure connections.

Hydrogen atoms diffuse into the metal and embrittle ordinary steels. In Mass-EXPERT meters all wetted parts are made of special materials with high resistance to hydrogen penetration into the metal — standard practice for high-pressure installations.

Yes. Pre-cooling before refueling brings the gas down to −40 °C, and this mode is within the instruments’ working range with margin. “Fill — pause” thermal cycling does not affect mass measurement.

No. Mass measurement does not depend on pressure or temperature: the meter captures the mass that passed through the sensor. Transients in the line are handled by the electronics, and the metering result remains sound.

Hydrogen density changes by hundreds of percent with temperature and pressure, so litres and cubic metres are unreliable without complex conversions. The kilogram is a direct measure of fuel quantity — commercial settlements are based on mass.

Gas error limits are ±0.5%, ±0.7% and ±1.0% depending on size; hydrogen configurations start at ±0.5%. Every meter is calibrated individually on a flow rig.

UNF internal thread (9/16–18), VCO connections with an O-ring seal and VCR with a metal seal — up to 96 MPa; models 008/015..PK use 3/4″ fittings (up to 30 MPa) and 13/16–16 UNF thread (up to 45 MPa).

Wetted parts are made of materials resistant to hydrogen embrittlement; the choice depends on operating conditions — 316L, 904L, Hastelloy, titanium, duplex. For wet hydrogen and impurities, Hastelloy alloys are recommended.

Hydrogen belongs to group IIC — the most ignition-prone group. The ME100 and ME200 transmitters are marked Ex db ib / db ia IIC T6 Gb (with a dust variant), and the sensor is connected via an intrinsically safe circuit.

Through standard interfaces: RS-485 (Modbus RTU), pulse or frequency output, 4–20 mA with HART, CAN. The controller receives instantaneous flow and the totalizer; the register map is provided for integration.

On the supply line — after the cooling unit and before the breakaway valve and nozzle. This is where the mass actually delivered into the vehicle tank is captured.

No. Coriolis measurement needs no flow conditioners: the meter is installed in-line in the high-pressure circuit, which is particularly valuable in the compact piping of a hydrogen dispenser.

Transmitters operate from 19.2–28.8 V DC, with power consumption up to 20 W. The cable route for remote posts is selected per the project.

The PK sensors deliver high sensitivity at low flows: the wide U-shaped tube profile provides a high signal-to-noise ratio. The lowest reliable dose is determined by the size — we select it against your fill profile.

For cryogenic lines, the D execution is available with a range of −255…+150 °C (separate design only): liquid hydrogen, helium, nitrogen and oxygen in cryogenic installations.

Yes. The meters are used for dosing hydrogen into fuel cells and power units, and on test benches — wherever accurate mass at low flows and high pressure is required.

Coriolis measurement measures the mass of any medium: hydrogen-containing gas mixtures, syngas and other compositions are metered with the same reliability as pure hydrogen.

Yes. The meter is entered in the State Register of Measuring Instruments under No. 98506-26: this enables commercial metering and use in the field of state regulation for ensuring measurement uniformity.

Yes — verification per procedure MP 98506-26 is performed on a reference flow rig or on site, using reference meters or a prover.

In many cases yes, and without welding: the execution is selected to match the connection and mounting dimensions of the existing unit. Compatibility with Micro Motion or Endress+Hauser instruments is checked against the piping drawing or a nameplate photo.

The meter has no moving or wearing parts — no routine maintenance is assigned. Average service life is 20 years, MTBF — 100,000 hours.

Warranty is 18 months from delivery or 12 months from installation, whichever expires first. Documentation travels with the meter.

The company is a Russian manufacturer based in Ufa: installation supervision, commissioning, service and verification are performed in Russia. The meter does not depend on imported supplies or logistics.

The stainless steel housing provides IP66/IP67 protection, and the transmitter operating conditions cover −60 to +70 °C (per the type description): enough from Siberia and Yakutia to southern regions.

Passport and operating manual, type description and verification procedure — the full set required for the project, installation and subsequent checks.

Yes. Test benches, proving grounds and pilot units often require non-standard parameters — execution, materials and scope are tailored to your specification.

The range is stepped: the base execution up to 10 MPa, P up to 45 MPa, PK up to 96 MPa on a wide U-shaped sensor. Hydrogen refueling uses PK; for medium pressures, P and 004..PK fit.

Send us the project parameters: working pressure and protocol (H35/H70), flow and dose, medium composition, connection type and interface requirements. We will select the sensor and transmitter and prepare a quotation.