Writing to Multiple Data Files Only When selected?

I am building a system that is measuring the CO2 content of 12 vessels but only 1 CO2 gas analyzer. So, my system has a series of valves that only lets one valve open at time so that only one vessel is being measured at a time. What I would like to is have a measurement file for each vessel so I don't have to worry about determining which data came from each vessel. Also, I only want to write measurements to each file whenever its corresponding valve is turned on. The third thing I would like to do is to be able to read the data file and plot the trend data as the test is running. These test will run for 14 days. So what would you recommend to do this? Would you recommend using a Write to Measurement File Express VI, Write to Spreadsheet, Write to Text File, Write to XML?
Requirment Summary
1) File for each vessel
2) Only write data to file when corresponding valve is selected
3) Ability to read the data files and plot the trend data over time for the 14-day test.
I am using a Consumer/Producer design with two consumer loops one for processing and writing the data and the other to control a pump for a waterbath that was made inhouse.
Thanks!
Attachments:
Producer-Consumer From Scratch2.vi ‏153 KB

This is such an open ended question...but I will give some advice.
If you plan on reading and writing to a file, dont use the write to measurement, you want to use the open/create/replace and close file functions. The particular file you write to can be either of those listed, but the text file will require all numeric values to be changed to strings, which is just more overhead to take care of. If I could recommend a type, it would be datalog files. They are great to organize your data. I don't see any reason to use XML. Do you want to be able to open and review this data later? Do Post-Analysis in Excel? Maybe write to spreadsheet is what you are looking for then.
Also, how fast are you gathering data? At high speed, maybe you want to use binary files. Downside is that you wouldn't be able to easily open the file for viewing outside of LabVIEW. For a 14 day test, make sure you have enough resources for your sampling rate, as any ASCII files, such as .txt, can grow large very fast depending on how you sample and how many digits you store.
For example, if we only store a 5 digit sample from one channel at 10 hz for 14 days:
5bytes/sample*10Samples/s*60s/min*60min/hour*24hour/day*14days = 60,480,000 bytes, or 60MB.
Are you wanting to show all of this data on a chart at once, and update live? This will use a lot of resources(RAM), but should be doable. I would obviously have to know more about your engineering requirements to make any more suggestions, just wanted to give you a feel for the ups and downs of some of your options. If you have the LabVIEW DSC module, then Citadel would be great for logging this data for you.
Rob K
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National Instruments
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