We offer the widest product range of low-flow (mass) flow meters and controllers on the market. Numerous styles of both standard and bespoke instruments can be offered for applications in laboratory, machinery, industry and hazardous areas.
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Learn more about how Coriolis-based flow meters can be used as microfluidic flow meter instead of thermal flow meters. Read the customer story of a microfluidics system builder who used Bronkhorst products.
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Bronkhorst High-Tech BV the leaders in Mass Flow Meter / Mass Flow Controller technology for gases and liquids, Pressure Controllers and Evaporation Systems.
A flow meter’s specifications are pivotal elements in choosing which flow meter is right for your application. Two important parameters are your flow meter’s accuracy and repeatability. Let’s start with explaining what these two parameters mean:
In general it can be said; the lower the percentage, the more accurate your flow meter. However, this also depends on the specification of either FS (Full Scale) or Rd (Reading). The meaning of Full Scale and Reading will be explained later in this blog.
Repeatability is producing the same outcome given the same conditions. In other words, a flow meter should produce the same readings when operated under the same variables and conditions. This, too, is expressed as a ± percentage.
While accuracy usually takes the spotlight in the measurement world, repeatability is the foundation on which accuracy rests. You can have high repeatability without high accuracy but you cannot have high accuracy without high repeatability. It is not helpful if the flow meter is highly accurate only once in a while. If your data is unreliable, if you get different numbers under the same circumstances and setup, there is no way those numbers can all be accurate.
Well….no, not by definition. But…no one wants an inaccurate meter, but not all applications require high amounts of accuracy. It may be acceptable to stray further from the calibration curve if you are only looking to get an idea of how much is flowing through a pipe. But it isn’t acceptable if you are mixing pharmaceuticals for consumption or volatile elements.
How accurate your meter needs to be is important when selecting a flow meter, because usually the more accurate a flow meter, the higher the price.
When you see an accuracy specification, it should be expressed as a percent of Full Scale (FS) or Reading (Rd or RD). The difference between those can be significant.
The definition of Full Scale is “Closeness to the actual value expressed as percentage of the maximum scale value.”
With Full Scale, the error remains the same but the percentage changes as the flow goes up and down the flow range. If the accuracy is calibrated 1% of 200 ln/min then the error is 0.01 x 200 ln/min = 2 ln/min. If the flow is 100 ln/min, the error is still 2 ln/min or 2%, a much bigger percentage.
As said before, although you don’t want an inaccurate flow meter, not all applications require high amounts of accuracy.
In terms of mass flow, accuracy requirements can change the type of sensor being discussed. If you need very high accuracy you can have a Coriolis mass flow meter, if high accuracy is less important, you may need a Constant Temperature Anemometry (CTA), like the MASS-STREAM series, or other sensor type.
When you install a flow meter you want the best performance right away. Check out our top 10 tips for installing your flow meter.
Do you know how to select the right flow meter? Selecting the right flow meter is the key to success. Check out our beginners' guide.
Check out why you can use a flow meter instead of a weighing scale. ✓Faster & Semi-continuous dosing ✓System availability ✓Risk reduction
Bronkhorst High-Tech designs and manufactures innovative instruments and subsystems for low-flow measurement and control for use in laboratories, machinery and industry. Driven by a strong sense of sustainability and with many years of experience, we offer an extensive range of (mass) flow meters and controllers for gases and liquids, based on thermal, Coriolis and ultrasonic measuring principles. Our global sales and service network provides local support in more than 40 countries. Discover Bronkhorst®!