Real-time flow monitoring

[ViniCampos]

Hello everyone,

It is just a simple question, I am a learner.

I got a DIO NI-9401, and it has been used for measuring flow rate by a edge counter task. It is working, but I don't know how accurate is this.

So, I would like to know your opinion. Would be better a task to count edges or frequency (how many pulses per second)?

Thank you in advance for sharing your experience.

[GerdW]

Hi Vini,

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@ViniCampos wrote:

it has been used for measuring flow rate by a edge counter task. It is working, but I don't know how accurate is this.

Would be better a task to count edges or frequency (how many pulses per second)?

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Counting edges to calculate a frequency (probably based on iteration time of your loop) is basically the same as using a DAQmx frequency task.

There are some subtle differences:

• DAQmx will use its internal timebase, which is probably more accurate than host computer timing.
• The frequency task will probably have more problems with very low frequencies (aka "no flow" condition)…