Natural Gas Ultrasonic Flow Meter

A pair of crystals is mounted at an oblique angle across the spool. One pulse fires downstream and rides the gas flow; the return pulse fires upstream and fights the flow. The time difference Δt between the two transit times is proportional to the mean axial velocity along the path, and the spool cross-section converts that velocity to volumetric flow at line conditions. Optional temperature and pressure inputs correct line m³/h to standard m³/h. The principle has no moving parts and no obstruction in the bore; pressure drop is near zero. The CSUF Series ships single-path or dual-path on DN25 through DN200, with ±1.0 % of rate or ±1.5 % of rate accuracy options.

Different jobs. The LWGQ natural-gas-turbine flow meter is a velocity-rotor instrument at ±0.5 % of rate that holds the high-accuracy billing position on DN50 to DN300, 1.6 to 10 MPa, with a 1:30 turndown. The CSUF natural-gas-ultrasonic flow meter sits in the mid-grade distribution slice; ±1.0 % to ±1.5 % of rate, DN25 to DN200, 1.6 MPa ceiling, 1:100 turndown standard. Pick the turbine when the service needs the tighter accuracy at high steady flow and the line will tolerate rotor wear. Pick this ultrasonic build when the service is industrial-park aggregation, fuel-gas-to-boiler, or wholesale-billing at a regulator station; where flow swings widely, the line cannot afford rotor wear, and mid-grade accuracy is enough.

G-class is the EN 1359 / EN 12480 gas-meter sizing designation used by positive-displacement and turbine gas meters; G16 / G25 / G40 / G65 and so on indicate the Qmax rating of a meter for clean gas service. The CSUF Series uses direct DN-and-flow-range tables instead, because ultrasonic transit-time reads volumetric flow directly from the velocity profile rather than from a calibrated displacement. Each CSUF DN has a published Q range on air at reference conditions: DN25 covers 0.4 to 40 m³/h, DN50 covers 1.6 to 160, DN80 covers 4.0 to 400, DN100 covers 6.5 to 650, DN150 covers 16 to 1,600, and DN200 covers 25 to 2,500. For natural gas at line conditions, the velocity-to-volume conversion is the same; for standard m³/h reporting, temperature and pressure compensation is added through the configurator.

No. The factory ships each meter with an ISO 9001 calibration record listing the calibrated DN, accuracy class, path count, and tested Q range. Hazardous-area cert is Ex d IIC T6 Gb (flameproof) and EMC compliance is to EU Directive 2014/30/EU. Country-specific billing type approval for natural-gas service; whichever local regime applies in the deployment country; is buyer-arranged with a notified body. CSUF is positioned for industrial-park aggregation, fuel-gas accounting, and wholesale-billing at distribution sub-stations, not for high-pressure transmission billing. Buyers needing tighter ±0.5 % of rate billing should specify the natural-gas-turbine counterpart instead; buyers needing G-class small-bore billing should specify the natural-gas-roots counterpart.

Only on post-upgrade biomethane after H₂S scrubbing, CO₂ separation, and drying; same dry-single-phase rule as natural gas. For that service, the platform supports CSUF, but the biogas-ultrasonic related page is the primary listing. For raw biogas at the digester or pre-upgrading buffer (water-saturated, H₂S up to 10,000 ppm), go to the biogas-swirl-flow-meter (LUXB Series) which uses Hastelloy C-276 wetted parts and tolerates wet H₂S service. For small-skid biomethane at G-class billing rates, the biogas-roots-flow-meter (LQ Series) holds ±0.5 % of rate at the low-flow tail. For high-flow grid-injection billing on RNG skids, the biogas-turbine-flow-meter (LWGQ Series) covers DN50 to DN200.

Standard lead time is 5 to 7 business days from order confirmation, factory direct. Each meter ships with an ISO 9001 calibration record listing the calibrated DN, accuracy class, path count, and tested Q range; a mill cert for the carbon-steel or stainless spool body; the build-coded serial plate with the model string; and the install dimensional drawing for the configured DN. Hazardous-area cert is Ex d IIC T6 Gb (flameproof) for classified industrial-park and refinery service. EMC compliance to EU Directive 2014/30/EU ships standard with IP65 ingress. The 3.6 V lithium battery option ships pre-fitted with a multi-year service life for off-grid AMR billing endpoints; the 4G wireless output option is paired with battery power for utility-telemetry service.