Nitrogen Gas Turbine Flow Meter (LWGQ Series)

A nitrogen gas turbine flow meter measures volumetric N2 flow through a free-spinning rotor in the pipe bore. Nitrogen accelerates through an integrated upstream flow conditioner, the rotor blades intercept the conditioned flow at a fixed angle, and a magnetic pickup downstream of the rotor reads pulses from a co-rotating signal wheel. Pulse frequency is proportional to volumetric flow through the calibrated K-factor. Built-in temperature and pressure compensation corrects volumetric flow to reference conditions (Nm³/h) on the 4-20 mA loop and the integrated totalizer, with no external multivariable transmitter required.

Pick LWGQ turbine when the application is custody-grade nitrogen billing; multi-tenant chemical-park settlement, industrial-gas distributor delivery meter, fab-wide N2 OPEX allocation. The ±0.5 % of rate volumetric accuracy with T+P correction supports fair invoice basis across tenants. Pick nitrogen TMF (thermal mass) when the application is low-flow N2 purge or blanket on a single reactor where direct Nm³/h mass output and 1:1200 turndown matter more than custody-grade accuracy. Turbine outputs volumetric corrected to reference; TMF outputs mass directly. Different buyer, different application.

No; the LWGQ is dry-gas-only by medium binding (−25 to +80 °C medium temperature). Cryogenic liquid nitrogen at −196 °C is liquid phase and outside the LWGQ operating range. For LN2 flow measurement go to Coriolis (handles cryogenic and 2-phase) or to a positive-displacement cryogenic meter from the industrial-gas distributor's preferred vendor. Contact engineering with line size, working temperature, vacuum-jacket detail, and flow target; we will recommend the right family or refer where ProFlow does not offer it.

The LWGQ ships with Ex d II CT6 Gb (flameproof, Zone 1) as standard for general N2 plant rooms and chemical-park enclosures, plus Ex ia II CT6 Ga (intrinsically safe) as an option for classified-area direct install without flameproof-housing rework. EMC 2014/30/EU (Annex II) ships standard. IP65 and IP66 ingress ratings are selectable at order. Pure N2 is inert and not a flammable atmosphere itself, but co-located process gases on the same skid (e.g. natural gas, hydrogen vent) often drive Ex requirement; specify the zone classification at quote.

For custody-transfer N2 billing on a multi-tenant chemical park or industrial-gas distributor delivery boundary, ±0.5 % of rate is the standard custody class. Each meter ships with an ISO 9001 calibration certificate listing the K-factor, calibrated DN, and tested flow range. The integrated totalizer is lockable, and the daily and timed-interval logger preserves the audit trail for invoice retrieval. For general process N2 (purge, inerting on a single reactor) ±1.0 % or ±1.5 % is sufficient and cost-optimized; specify the accuracy class at the configurator stage.

The nitrogen LWGQ build covers DN50 to DN200 standard for chemical-park and fab N2 distribution service (the full family runs DN25 to DN300; the DN50–DN200 range covers the typical N2 service window). Pressure classes run 1.6 to 10 MPa metric (ANSI 150 LB to 600 LB) and medium temperature is −25 to +80 °C. Body material is 304 stainless standard (dry N2 fits 304), with 316L upgrade for chloride-bearing co-located service or titanium for exotic chemistry on shared headers. The build is dry-gas-only; wet N2 carry-over and 2-phase service are out of scope.

Standard lead time is 5 to 7 business days from order confirmation, factory direct. Each nitrogen LWGQ ships with an ISO 9001 calibration certificate listing the K-factor, calibrated DN, and tested flow range against air reference (gas-turbine measurement is largely insensitive to medium type within the medium binding, so air-reference K-factor applies to dry N2 service). Hazardous-area certification options are Ex d II CT6 Gb (flameproof, Zone 1) and Ex ia II CT6 Ga (intrinsically safe). EMC 2014/30/EU (Annex II) ships standard, with IP65 and IP66 ingress ratings selectable at order.