Industrial Gas Ultrasonic Flow Meter

An ultrasonic gas flow meter is a non-intrusive volumetric instrument. A pair of crystals is mounted at an oblique angle across the spool body; one crystal sends a pulse downstream (riding the gas flow), the other sends a pulse upstream (fighting the flow). The time difference Δt between the two transit times is directly proportional to the mean axial gas velocity along the acoustic path. There are no rotors, no obstructions, and no moving parts in the gas path, so the pressure drop across the meter is effectively zero and the meter reads accurately in either flow direction. Single-path and dual-path builds are offered for this Series; higher-path utility-billing builds are a different product class and are not part of this range.

The two counterparts cover different sweet spots on industrial-gas service; pick by flow range, pressure-drop tolerance, and audit need. The industrial-gas-roots-flow-meter (LQ Series, twin-lobe PD) wins low-flow tenant fence-inlet billing at DN25 to DN100 with ±0.5 % of rate accuracy and 1:30 turndown; honest fact; Roots is the more accurate option in its range and the right pick for per-tenant invoice precision. The CSUF gas ultrasonic on this page wins DN100 to DN200 mains metering with zero pressure drop, bidirectional measurement, no rotor wear over the meter life, and 1:100 turndown for ISO 50001 audit that spans peak shift load through off-shift leak drift. CSUF is ±1.0 % of rate; mid-grade audit accuracy, not tenant-billing grade. For per-tenant invoice sub-billing on DN25 to DN100 use Roots; for plant-mains audit / sub-measurement at DN100+ where pressure drop matters use CSUF.

LWGQ turbine is the higher-accuracy bulk pick across the family at DN25 to DN300 (N2 version DN50 to DN200, compressed-air version DN25 to DN300) and 1.6 to 10 MPa; chemical-park bulk N2 / O2 distribution headers and plant-air main supply runs where line velocity stays inside the turbine working range. CSUF ultrasonic is the pick when (a) DN150 or DN200 mains pressure drop becomes a problem for blower / regulator margin, (b) the service needs bidirectional measurement (cross-feed N2 distribution, recirculating air audit), (c) flow ranges from full peak down to off-shift leak drift through a 1:100 turndown that turbine bottom-of-range cannot hold, or (d) no rotor wear is required because the meter sits on a hard-to-reach plant-mains run. Above 1.6 MPa or for ±0.5 % of rate bulk-N2 custody, go to LWGQ turbine.

The 3.6 V lithium battery (power code V) plus integrated 4G wireless output (signal code 7) powers the meter and streams instantaneous flow, totalizer, and any compensated T/P readings to a back-office energy-management or sub-billing system without permanent mains supply. The combination suits ISO 50001 audit endpoints on rooftop compressed-air mains, chemical-park N2 distribution branch valves on remote pipe racks, and unmanned industrial-park sub-measurement points where pulling 24 VDC service is impractical. Battery service life depends on logging interval and signal strength; specify the duty cycle at the configurator stage for an engineered service-life estimate. For permanent panel installs select 24 VDC (power code U) with RS-485 Modbus, HART, or 4-20 mA output to the plant DCS.

No. The factory ships an ISO 9001 calibration certificate with each meter listing the calibrated DN, K-factor, accuracy class, and tested flow range across the published range, calibrated against air on a reference rig. Hazardous-area certification is Ex d IIC T6 Gb flameproof; ingress is IP65; EMC compliance is to EU Directive 2014/30/EU. Pattern-approval / type-approval for utility-tariff billing under the local gas-meter metrology regime is buyer-arranged with a notified body in the deployment country; the factory provides build documentation and traceable calibration records to support the buyer's type-test submission. For utility-tariff billing at ±0.5 % of rate the better pick is the LWGQ gas-turbine counterpart; this CSUF model is positioned for industrial sub-measurement and ISO 50001 audit, not utility tariff billing.

Standard lead time is 5 to 7 business days from order confirmation, factory direct. Each meter is calibrated at the factory against air on a reference rig per the selected accuracy class (±1.0 % or ±1.5 % of rate), tested across the published flow range for the selected DN, and shipped with the ISO 9001 calibration certificate listing K-factor, calibrated DN, tested range, and accuracy class. The Ex d IIC T6 Gb flameproof certification, IP65 ingress, EMC 2014/30/EU compliance, and the build-coded serial plate ship standard. Witness calibration at a third-party metrology institute before shipment can be arranged on request; specify the witness requirement at quote so the lead time can accommodate the booking.