While we can use a ruler to quickly and accurately measure the length of a desk, there’s no comparable unit of measure we can apply directly to gas in order to determine its rate of flow. Gas flow measurement is elusive. The key to understanding gas flow measurement is in recognizing that there are seven SI base units (International System of Units) that have been quantified and refined worldwide. Their precise values are unlikely to change.
These SI base units are also called the “primary units of measure” and include length, time, mass, electric current, thermodynamic temperature, amount of substance and luminous intensity. Since there’s no SI base unit for the direct measurement of gas flow, flow is best determined by measuring the time it takes to positively displace a known volume of gas.
Volumetric piston provers, such as Bios products featuring Proven DryCal Technology, are based on a century-old platform that’s still considered by many, including national labs, to be the most desirable method of measuring gas flow, since the results are directly traceable to the SI base units. And unlike other piston provers, Bios gas flow standards do it without water and soap bubbles, oil, or hazardous mercury.
Bios products are small, shippable and easy-to-use. With Proven DryCal Technology products, customers receive accurate, directly traceable primary flow measurements that are fully supported by our leading ISO 17025 laboratory accreditation.
For more information on the ISO 17025, click here.
To learn more about gas flow, click here.
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