Log data when signal is for at least one hour stable

Question

All, can you please help me out with the following;
I have data to log when one signal is for at least one hour between two values. If this is the case, all the data can be kept. If this is not the case, let's say after 30min that one signal is out of spec, previous measured data in those 30min may not be displayed in the log file. Does somebody have a solution for this?
Thanks in advance
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Answer 1

So, it means, you want to log data if pressure is between 8 and 12 bar. Else, discard data and continue monitoring of data. Monitor only value
Right?
you can compare the pressure value using an In Range function and put a case structure to log data only when the value is in range. use timestamps to know when the data was in range. so the file only contains data when the pressure is in range
Or, if you want to log data ONLY IF the presusre was between 8 and 12 bar AND for an hour or more, then, put a timer to check time elapsed since the last value change and then log if timer has counted an hour. Then instead of inrange, use a shift register to see the last value which changed and then turn on a timer. When the value changed next, update the shift register. when the timer is up, reset the timer and log data.
I will take time to put these two logics on code and post. instead, you can make a code of either of the two options and post back. we can review your progress.  
Almost forgot two questions: How are you reading the data? hardware used and data type? which file format do you plan to use?