Flow Meter

[joecoffman]

I am using Signal Express and  a usb-6000 DAQ, I am measuring flow from a flow meter and need to configure a totalizer in signal express so I can track how much flow we have going out of the plant. I also need to configure instantaneous flow at a point and time when I take samples. Any Ideas.

[algarcia]

Hi joecoffman,

Have you worked with SignalExpress before and have you started a project already for your totalizer?

The introduction on how to start configuring a project can be found on page 14 of the pdf below:

http://www.ni.com/pdf/manuals/373873h.pdf

[joecoffman]

I have a little knowledge of SignalExpress, mostly what I have self taught reading and online videos. I am able to acquire my signal with DAQmx and set up steps as to min, max, average in current. I am how ever unable to get 0-5 volt scaled appropriately (0= no flow, 5=1600 gpm) and then figure how to translate that to total flow over a 24 hour period.

[algarcia]

In order to scale the voltage properly, you will need to create a custom linear scale:

How to Create a Custom Scale in SignalExpress

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P9SeSAK

How often do you take samples of flow rate?

[joecoffman]

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@algarcia wrote:

In order to scale the voltage properly, you will need to create a custom linear scale:

How to Create a Custom Scale in SignalExpress

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P9SeSAK

How often do you take samples of flow rate?

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OK I got the Custom Scale set up and works perfectly.

Now I just need to set up the Total flow for a 24 hour period.

I sample 3 times a day.

[algarcia]

Glad to hear the scale is set up correctly. 

Since you're sampling 3 times per day, that means each sample represents 8 hour increments correct?

Each sample would be the average flow for that 8hr period, so total flow be the summation of the 3 sample values multiplied by 8 by 60(min):

Total = 8*60(sample1+sample2+sample3)