Temperature Control

Cryogenic (sub-ambient) oven control

Cryogenic (sub-ambient) oven control

Liquid N1 or liquid CO1 cryogenic options are for operation at temperatures less than about 7^C above ambient. This is done through operation of a valve which opens when coolant is demanded and closes when the setpoint temperature is reached.

When you press gold CRYO PARAM CRYO PARAM CRYO PARAM you scroll

through a series of displays for choosing cryogenic options. These options include CRYO for operation during the entire run, CRYO BLAST, for very fast cool down between runs, and AMBIENT to regulate on and off times to optimize coolant use.

Figure 3-3

ACTUAL

SETPOINT

For operation during runs at

CRYO

ON

subambient temperatures.

ACTUAL

SETPOINT

 

CRYO BLAST

ON

ACTUAL

SETPOINT

 

 

AMBIENT

25

For very fast cool down between runs.

Lets you regulate Cryo and Cryo Blast on and off times to optimize coolant use. Default is 25^C and need not be changed unless

ambient differs by 10^.

Cryogenic options

The following figures show the oven temperature profile for a typical run, showing the on and off times for CRYO and CRYO BLAST.

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