February 2010 
 
Fieldbus Technology (Part 2 of 5)
Spitzer and Boyes, LLC 

HART was an interim development in the late 1980's stemming from the original SP50 work on Fieldbus for suppliers to retain the 4-20mA analog transmission and conduct a digital data exchange in the same two-wire loop. Technology at the time restricted the data rate to 1200 bps when the analog signal was present.  click for more... 
 

What Do We 'Know'
Revelations in Flowmeter Straight-Run Effects
Flow Control (February 2009) 

Sometimes we “know” things that are not true. For example, we used to “know” Mother Earth was flat. Columbus “knew” he could sail eastward to reach the Far East, but did not “know” that a few continents would lie in his path. We used to “know” the Sun was in orbit around Earth, until we found out it was the other way around. It is in this light that we consider what we’ve “known” about straight-run requirements for flowmeters in relatively large pipes.   click for more... 
 

Know Flow with No Flowmeter
Flow Control (February 2009) 

There are times when there is no flowmeter installed, but it is necessary to determine the flow through a pipe. What techniques can be used to determine the flow? 

A. Process calculations
B. Control valve calculations
C. None of the above
D. Both of the above

click for more... 
   

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