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2. Gas meter - Wikipedia

   en.wikipedia.org/wiki/Gas_meter

   The meter then compares the difference between the upstream and downstream speeds to calculate the velocity of gas flow. Ultrasonic meters are high-cost and work best with no liquids present at all in the measured gas, so they are primarily used in high-flow, high-pressure applications such as utility pipeline meter stations, where the gas is ...

3. Positive displacement meter - Wikipedia

   en.wikipedia.org/wiki/Positive_displacement_meter

   Positive-displacement (PD) meters can measure both liquids and gases. Like turbine meters, PD flow meters work best with clean, non-corrosive, and non-erosive liquids and gases, although some models will tolerate some impurities. Because of their high accuracy, PD meters are widely used at residences to measure the amount of gas or water used.

4. Custody transfer - Wikipedia

   en.wikipedia.org/wiki/Custody_transfer

   The rotor spins in proportion to flow rate (see turbine meters) . There are many types of turbine meters, but many of those used for gas flow are called axial meters. [8] The turbine flowmeter is most useful when measuring clean, steady, high-speed flow of low-viscosity fluids.

5. Flow measurement - Wikipedia

   en.wikipedia.org/wiki/Flow_measurement

   Turbine meters are less accurate than displacement and jet meters at low flow rates, but the measuring element does not occupy or severely restrict the entire path of flow. The flow direction is generally straight through the meter, allowing for higher flow rates and less pressure loss than displacement-type meters.

6. Turndown ratio - Wikipedia

   en.wikipedia.org/wiki/Turndown_ratio

   The examples are here for gas flow, but the same meter types can be used on liquids as well, with similar turndown ratios. Note that meter manufacturers state their products' turndown ratios—a specific product may have a turndown ratio that varies from the list below. [citation needed] A thermal mass flow meter has a turndown ratio of 1000:1.

7. Fluid Components International - Wikipedia

   en.wikipedia.org/wiki/Fluid_Components_International

   FCI operates a NIST flow calibration laboratory with 19 precision flow stands. FCI utilizes these precision flow stands to flow actual gases and reference fluids matched to the temperature, process conditions, and line size of individual customers' flow meter applications. The company has subsidiaries in Tilburg, Netherlands and Beijing, China.