Increasing Gas Flow Measurement Accuracy with Precise Mass Flow Meters
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[music] Precise flow measurement that has the shortest
piping requirements of any flow meter in the industry. The 780 mass flow meter with built-in
flow conditioning from Sierra. Pioneering thermal mass flow measurement. One difficulty in measuring gas flow is that
any change in the direction, size, or shape of the pipe will create a distorted profile
that prevents an accurate flow measurement. Let’s say we have a process gas, a fuel gas,
or an exhaust gas moving through this 6 inch pipe, and we need accurate flow measurement
here, but the elbow is creating a complex, unstable flow profile that makes accurate
measurement impossible. There are only about 3 diameters between the bend and the process.
How can we get an accurate flow measurement? We could add pipe to take the straight run
out to 20 diameters giving us a fully developed profile, but it wouldn’t be flat. Adding pipe
would be costly, and take up valuable space. Flow conditioning is a better solution. We
could insert a tube bundle, and we’d eliminate swirl, but we’d still have to increase the
length of the straight run to remove the flow profile distortion. But, when we install a
Sierra 780 Inline Flow Meter we get a true, flat profile, and the measurement we need
in just 2 diameters, the shortest meter pipe run in the industry. The 780’s flow body contains dual stainless
steel flow conditioning plates welded into the flow body. The first plate breaks up the
flow profile into highly active eddies. The second plate further conditions the gas stream
creating a true, flat velocity profile for accurate measurement. This is true whether
the profile distortion results from a change in pipe angle or from a change in pipe diameters,
or from any other flow disturbance. The 780’s flow body eliminates concern about
what’s happening upstream. It always provides a precise, direct measurement of gas mass
flow with no need for temperature and pressure compensation. Unlike other flow meter technologies,
the model 780 flow body with built-in flow Conditioning requires no downstream straight
pipe run. An orifice plate, for example, even with upstream flow conditioning requires five
or more diameters of straight pipe after the plate. With the Sierra Model 780, once the flow passes
the sensing element, the measurement is complete, and there is no downstream straight pipe requirement.
The Sierra 780 also gives you direct mass flow reading, one-second response, outstanding
rangeability, no moving parts, and a low installation cost and it’s FM, CSA, and Cenelec approved
for hazardous locations. The Sierra 780 with built-in flow conditioning
is available for 2 inch through 8 inch diameters. It provides the shortest upstream pipe run
requirements in the industry, and no downstream pipe run requirements. Fax your specs to Application
Engineering at 408-373-4402, or call us at 1-800-866-0200 for free flow meter sizing
software. We’ll send you the details.

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