Mass Flow
2009
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 TYLAN FC 260 MASS FLOW CONTROLLER 150 PSI WITH CERTIFICATE OF COMPLIANCE $99.95 Time Remaining: 1d 17h 34m |
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 PORTER MASSFLOW MODEL LB 223 FLUID TYPE AIR 20 SLPM $200.00 Time Remaining: 5h 20m Buy It Now for only: $250.00 |
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 OMEGA Engineering 20+ Gas Selectible Mass Flow Controller $599.00 Time Remaining: 16d 22h 20m Buy It Now for only: $599.00 |
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 Lintec Mass Flow Meter LM 1100M 8 Liquid Flow Control $24.99 Time Remaining: 7d 2h 45m Buy It Now for only: $24.99 |
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 1 4 Micro Motion T025 T613SABUEZZZZ Mass Flow Sensor A3 766 $1,250.00 Time Remaining: 16h 14m |
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 AMAT AFC 0550A Mass Flow Controller MFC H2 200 SLM $216.99 Time Remaining: 14d 14m Buy It Now for only: $216.99 |
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 1 2 Micro Motion CMF025 M321NU Mass Flow Sensor A13 759 $550.00 Time Remaining: 7d 22h 23m |
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 UFC 1100 Unit Instruments Mass Flow Controller SIH4 500 SCCM $283.99 Time Remaining: 23d 1h 20m Buy It Now for only: $283.99 |
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 AERA Mass Flow Controller MFC FC 980 4SLM N2 $299.00 Time Remaining: 23d 16h 32m Buy It Now for only: $299.00 |
 Celerity IFC 125 Multiflo Mass Flow Controller MFC $299.99 Time Remaining: 29d 8h 42m Buy It Now for only: $299.99 |
 Mass Flow Control Valve MKS Type 0248A 500002V 50000 SCCM 50 SLPM $89.00 Time Remaining: 4d 5h 16m Buy It Now for only: $147.00 |
 2 150 Micro Motion CMF200 Elite Mass Flow Sensor NEW 710 $7,500.00 Time Remaining: 2d 21h 31m Buy It Now for only: $7,500.00 |
 MKS Mass Flow controller 1179AX51CR14V $250.00 Time Remaining: 5d 20h 13m Buy It Now for only: $250.00 |
 Celerity Multiflo Mass Flow Controller 8561HOS N2EQV 90 SCCM $249.99 Time Remaining: 29d 8h 42m Buy It Now for only: $249.99 |
 MKS 2179A 13CR1BV 500 SCCM N2 MASS FLOW CONTROLLER MFC $114.99 Time Remaining: 14d 4h Buy It Now for only: $114.99 |
 MKS Instruments 0258C 00020SV Mass Flow Meter $100.00 Time Remaining: 3d 3h 3m Buy It Now for only: $100.00 |
Mass Flow
Using A Gas Mass Flow Meter
A gas mass flow meter is the tool you are looking for if you are trying to directly determine the amount of gas passing through a point at any given time. Before purchasing your gas mass flow meter make sure that you have a clear understanding of what you expect to gain from the product first. You can purchase heavy duty industrial flow meters with many features or you can purchase a simple flow meter for use in your home. Also keep in mind that if you want to measure a liquid such as water you will want to purchase a liquid mass flow meter.
Things to Consider Before Purchasing a Gas Mass Flow Meter
Not all gas mass flow meters allow you to remotely transmit the data acquired by your device. If this is a function that you will be requiring you will need to pick your meter accordingly. If you do select a gas mass flow meter that is capable of transmitting data remotely make sure its update frequency also corresponds with your expectations for the device.
Think about how easy your gas mass flow meter needs to be. The complexity of these devices varies greatly from one product to another. If you just need a simple flow meter make sure to purchase a stand alone device that does not require attachment to a computer for configuration.
If repeatability is your greatest concern when purchasing a gas mass flow meter, select a device that has a limited amount of moving parts. The fewer parts you having moving in the cavity of your gas mass flow meter will result in a more repeatable and consistent outcome.
If you know that the commodity you are trying to measure consists of large particles, you may be required to use a filter with your gas mass flow meter. Check individual product specifications for details.
One possible drawback to using a flow meter is the possibility of pressure drop. This is caused by the leaking of gas instead of the capturing of gas in the flow meter cavity. Also keep in mind that your meter will need to be calibrated to whatever type of gas you will be testing.
Consider the available power supply for your gas mass flow meter. Many devices offer optional battery packs if an electrical source is inconvenient or not feasible. As with any battery operated device, products with this option are going to provide the user with fewer details and features.
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Can a reflux stream have a greater mass flow than the feed?
I am designing a process to create acetaldehyde from ethanol. The unconverted ethanol from the reactor is recycled and run through the reactor again. After performing my mass balance, the amount of ethanol in the reflux stream is greater than the amount in the feed stream. Is this possible? Also, my conversion of ethanol is only 45% thus I can kind of see how the reflux would gain.
Any help is appreciated.
This information may be helpful regarding the similar processes and what others are getting.
http://www.che.cemr.wvu.edu/publications/projects/large_proj/Acetaldehyde.PDF
http://sbioinformatics.com/design_thesis/Acetaldehyde/Acetaldehyde_Material-2520Balance.pdf
347 Ford Stroker Crate Engine With Mass-Flow EFI
