Debit Total of programming

Hi all

It's my first time programming in LabVIEW and slowly grasp the concepts I'm found stuck on a very simple task (more likely). I have two flowmeters hung in the series that I get speeds of, I can take the average of the two for better accuracy with our readings and the value of display on the front panel.

Here's where I start to have problems. The flow through the meter is not continuous, we will turn the market circulation several times throughout our tests. Currently, it is very good and I don't see my average flow when the meter is turned on and 0.0 when there is no flow, since he constantly records. Though, now I need to display the total volume that ran through the flowmeter during operation.

Thus, for example, we spend on the stream ("draw") to 3.0 GPM for 0:02:30 then the output reads 7.5 gallons and would reset this total to 0.0 before the next draw started. So, in principle, we would see only the total for each series of draws. Although, it would be useful to keep a running total of the number fired during the entire test.

I know that to create a running total, I can use a while loop and a change to the registry. This, I think, will give me the total gpm on a period of x cycles, which I could then divide by the number of cycles and exit the average flow in 1 minute (mean flow available1). I have the following program resets and repeat this loop until a minute and adds this number (flow2) to a total accumulated for my overall volume? I don't know how to start / stop the while loop based on when I paint, unless I'm somehow save the stream of 0,0 and when the while see what it stops? I don't know there is a different (better) way to do this that is constantly running and recording?

Any advice would be appreciated, thanks for your time.

I would use the GPM 0 as your marker in the draw is completed.  Yes, keep a record to offset for the amount of flow.  Keep a record to offset for the number of samples taken.  You will also need to know your sampling rate.  It's just a simple multiplication from there.  A simple state machine should be able to easily handle this.

Tags: NI Software

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