Oxygen Gas Turbine Flow Meter (LWGQ Series)

The LWGQ oxygen turbine measures volumetric gas flow through a free-spinning rotor in the pipe bore. Oxygen passes through an integrated upstream flow conditioner, the rotor blades intercept the conditioned flow at a fixed angle, and a magnetic pickup reads pulses from a co-rotating signal wheel. Pulse frequency is proportional to volumetric flow via the calibrated K-factor. Built-in temperature and pressure compensation outputs corrected volume in Nm³/h on the 4-20 mA loop. Each meter ships with a factory K-factor calibration cert, ±0.5 % of rate option, lockable totalizer, and audit-trail logger; the four practices needed for custody-grade volumetric billing.

No. The factory provides an oil-free build; degreasing of wetted parts to remove hydrocarbon residue per ASTM G93 method; specified at quote on this 316L body. ProFlow Meters does NOT hold a third-party ISO 15001 or ASTM G93 certification. Buyers who need a formal oxygen-cleanliness certificate arrange that with a notified body or an accredited oxygen-service shop, working from the oil-free build the factory ships. State the cleanliness level (e.g. CGA G-4.1 Type II) and witness requirements at quote so the build sheet captures the right degrease procedure and the right packaging.

Pick the LWGQ oxygen turbine when the application is custody-grade volumetric billing; medical-gas manifold sub-measurement, industrial-gas vendor-to-customer fence billing, or furnace-enrichment cost-allocation per heat. The ±0.5 % of rate accuracy range and T+P compensation give the corrected Nm³ needed for invoice or cost-allocation. Pick the oxygen TMF (thermal-mass) when the application is general industrial O2 service; welding-shop manifold, water-treatment ozone feed, lab gas; where direct mass output and the 1:1200 wide turndown matter more than custody accuracy. Mass-flow direct output is TMF; volumetric custody-grade output is LWGQ.

No. The LWGQ is rated for dry-gas service only; medium temperature −25 to +80 °C and single-phase gaseous oxygen above the vaporizer outlet. Cryogenic liquid oxygen (LOX) at −183 °C in the supply tank or the vaporizer-feed line is out of binding and must go to a Coriolis or a cryogenic-rated mass-flow meter. Install the LWGQ downstream of the vaporizer, after the gas has warmed to ambient and stabilized at distribution pressure. The 316L body and oil-free build still apply; the medium-temperature spec is the binding limit.

The LWGQ oxygen build covers DN50 to DN150 (2″ to 6″) on the standard run, which spans hospital ward manifolds, industrial-gas vendor fence meters, and most furnace-enrichment headers. Pressure classes run 1.6 to 10 MPa metric or ANSI 150 LB to 600 LB; cover bulk-O2 tank outlet pressure (typically 1.4 to 2.0 MPa) and high-pressure cylinder-manifold service. Hazardous-area options are Ex d II CT6 Gb (flameproof, Zone 1) for general industrial service and Ex ia II CT6 Ga (intrinsically safe) for classified-area medical-gas plants. IP65 or IP66 ingress is selectable at order.

Standard lead time is 5 to 7 business days from order confirmation, factory direct. Each meter ships with an ISO 9001 calibration certificate listing the K-factor, calibrated DN, and tested flow range for that serial. The 316L body is built with factory oil-free preparation for oxygen service (specified at quote). Hazardous-area certification options are Ex d II CT6 Gb (flameproof, Zone 1) plus Ex ia II CT6 Ga (intrinsically safe). EMC compliance to the EU Electromagnetic Compatibility Directive 2014/30/EU (Annex II) ships standard, with IP65 and IP66 ingress ratings selectable at order. Buyers needing ISO 15001 oxygen-cleanliness certification arrange that with a notified body.