What does it all mean ? (2)

   That's a good question.  The SA was not written to make     
complete sense to someone unfamiliar with Tev refrigerators.   
Get someone to explain it to you, or here's a feeble attempt at
an explanation:                                                
   First take a look at HELP on "color definitions".  All those
hour glass shapes are supposed to represent electrically       
controlled valves.  The 2 big triangles are Helium expansion   
engines.  The "W" is for "Wet" engine (liquid Helium) and the  
"D" is for the "Dry engine (Helium gas).  The resistor shapes  
(zig-zag lines) are heat exchangers.  All the thin BLUE lines  
are simply pointers pointing out the location of the           
transducers.  The rest of the lines are Helium or Nitrogen     
flows.  There's lots more so go to "more info 1" below.