How to view change in signal over specified time

I'm trying to create a .vi that will view an incoming signal (temperature or pressure, in this case), compare it to data over a specified amount of time, find the delta, and if it fits into a set range, output a true boolean.
In real terms, I want to view a temperature over, say, the last five minutes, and if the delta is less than two degrees, light up a boolean.
I know I'll need the elapsed time module, with a control multiplied by sixty for the "time target", and the "time has elapsed" as the boolean control. I'm assuming it will also look at a comparison between the present values and the values stored in an array and if it's outside the specified delta it will output a true value to the "reset". This will also have to reset the array, is my assumption.
I'm new to programming in general, and LabVIEW, so that's about as far as I got in the logic before I decided to see what the forums have to offer.
Thanks,
-Ian

Is this steps in the right direction? Seems like it should work, anyone see any flaws here?
-Ian
Attachments:
Pleateu Detector.png ‏111 KB

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