MODES OF OPERATION
On Demand Mode
In ON DEMAND mode, the CryoWiz™ supplies LN2 based on the demand for LN2. In this mode, the
primary source inlet valve is maintained in the open position, flow being controlled by the connected
device downstream of the CryoWiz™. The reserve source valve is maintained in the closed position.
LN2 will flow when a valve on the connected device opens and allows LN2 to flow into the device. By
monitoring the outlet pressure, the primary inlet LN2 temperature, and the amount of time the device is
requesting LN2, the CryoWiz™ determines if the device is performing a quick chill, a defog, or is
actually requiring a fill cycle.
If the CryoWiz™ determines that a fill cycle is required, the primary side purge valve will open,
allowing purge gas to flow through the vent connection at the top of the enclosure. This results in a
quick drop to the user-settable threshold temperature, and maximization of liquid flow.
If the CryoWiz™ determines that a quick chill, defog, or other temporary demand is required, the
purge valve remains closed, and a purge is not performed, thus minimizing LN2 usage.
Display When in On Demand Mode
When configured for ON DEMAND mode, a green light indicating ON DEMAND will illuminate.
The side selected to be primary will be indicated by a green SELECTED light. Upon startup, the
CryoWiz™ will default to LEFT side primary.
Each side that is sensed to be connected to a liquid supply source will have an illuminated LIQUID
light. If the LIQUID light is yellow, that means the temperature at the source inlet valve is above the
temperature optimal for liquid delivery (the threshold temperature). A green LIQUID light indicates that
the threshold temperature has been reached, and conditions are optimal for liquid delivery.
When demand for a fill cycle is sensed, the green FILLING light will blink for a period of time and then
illuminate, and the user-settable defog timer will begin (this will not happen for a quick chill or defog).
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