Accurately Measuring Dry Bulk Solids | Powder/Bulk Solids Technical Exclusive

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Check out the great Technical Exclusive published by our Christopher Lewis on the Powder & Bulk Solids Website and in print soon!


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Accurately Measuring Dry Bulk Solids | Powder/Bulk Solids

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Velocity Averaging Pitot Tubes for Air and Gas Flow Measurement

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When it comes to measuring the flow rate of air or gas in a duct, there are many different devices used.  For example, there are thermal sensors, hot wire anemometers, rotating vane anemometers, static pressure drop devices (venturi, orifice plate), and differential pressure devices (pitot, annubar, primary element).  The most widely used and considered a true measurement of the flow is the differential pressure device.  The most widely used differential pressure device is a velocity averaging pitot tube. Velocity Averaging Pitot Tube The velocity averaging pitot tube is a device that when inserted into the air or gas flow stream, provides a high pressure measurement port and a low pressure measurement port.  The high pressure port measures the total pressure created when the air or gas stream impacts the port, where the low pressure port typically measure the static pressure in the duct. VAP³ Velocity Averaging Pitot Tube from Eastern Instruments The difference between the
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Air Flow Straightener, Air Flow Profiler, and Air Flow Conditioner - What is the difference?

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When measuring the flow of air or gas in a duct or pipe, accuracy is dependent on the type of device used to make the measurement, but is very dependent on the flow profile in the duct or pipe.  For example, if the flow in the duct or pipe is turbulent, many types of flow measurement devices will not even be able to measure the flow or have such an error you would be better off not having the measurement at all.  Here we will look further into turbulence and ways to minimize or eliminate it so that an accurate air flow measurement can be made. What is Turbulence? Turbulence can come in many forms, for example the flow could be spinning in the duct (cyclonic flow), or the flow could be going in the opposite direction than it is supposed to be going (reverse flow), or it can be off to one side or even angular (not parallel to the center-line of the duct or pipe).  When a flow sensor, averaging pitot tube, thermal mass sensor (thermal dispersion), venturi, or even an orifice plate is
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Differences between the Impact Flow Meter and the Centripetal Force Flow Meter

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There are a lot of solids flow meters on the market these days.  But not all of these devices are the same, even though they may look the same.  Many companies promote their devices as one thing, but underneath the hood they are really something else.  So, how does a plant manager, process engineer, or maintenance manager tell the difference to pick the device they need to get the results they need?  This blog will try to help clarify the difference between two of the most popular solids flow meters, the impact meter or impact flow meter and the centripetal force meter. HOW THEY WORK The Impact Flow Meter: The impact flow meter goes by many different names like impact meter, impact scale, impact weigher or impact flow meter, but they are all basically the same.  The measurement technique for an impact meter is fairly simple, product flow is dropped down a chute and directed to impact plate at a specific angle and flow rate. The impact creates an impact force, which has a v
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