MUST READ: cascade temperature controller issue

gthareja at stanford.edu gthareja at stanford.edu
Tue Jul 1 17:38:34 PDT 2008


dear cascade users

all this condensation/cold chuck mess happening on the cascade chuck  
is unacceptable. It is hurting the CV and IV measurments seriously.

1. Please plan a 30 min overhead when using temperature controller.

2. when you come to system, the chuck should not be cold. please feel  
the chuck with a gloved hand. If it is cold or condensing, kill the  
previous user :). We have already suspended one bad user.

3. Nitrogen flows all the time when temperature controller (high or  
low T) is under use.

4. So you go to desired temperature (low/high) and measure devices.  
Then after finishing the measurement, you go to 110C and stay there  
for 10 min to boil off any condensation. Then you go to 40C (VERY  
IMPORTANT, THIS IS NOT 27C or RT - THIS IS WHERE EVERYONE IS MESSING  
UP) and rest for 10 min. Then turn off the temperature controller. let  
nitrogen flow for sufficient time (>10 min).

If you ramp down to 27C, the temperature chiller starts and cools the  
ambient - causing condensation...which is BAD.

5. Record all temperature ramps on the log sheets

happy measuring and lets be responsible users.



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