HomeRoast Digest


Topic: PID...HX...etc. (2 msgs / 39 lines)
1) From: Martin Reuben
So what do these abbreviations mean?  There's probably some others that I
don't know about as well.
tx,
Martin Reuben
www.reubenphoto.com
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2) From: David Lewis
<Snip>
PID:	Proportional-Integral-Derivative. A classic method of process 
control, and in the context of an espresso machine it refers to the 
replacement of the standard thermostat with an industrial controller 
which uses that algorithm. The result is much tighter and more easily 
variable control over brew temperature.
HX:		Heat Exchanger. A construction used in many higher-end 
espresso machines, in which brew water is supplied through a tube 
passing through a large boiler. The boiler supplies water for 
steaming, and the tube is designed to supply brew water at a lesser 
temperature by balancing the time its contents are exposed to the 
hotter boiler water.
Hope this helps; here's your handbasket.
	David
-- 
Less than 0.1 percent of the U.S. population gave 83 percent of all 
itemized campaign contributions for the 2002 elections, according to 
the Center for Responsive Politics.
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