System Start Up
This section assumes the Chart Phase Separator is full of liquid nitrogen. If this is not the case, ample
time is needed to fill the Chart Phase Separator with liquid nitrogen before the UltraDoser 2K can start-
up.
1. Manually close (counter-clockwise) the ball valve (yellow handle) on the Purge Kit.
2. Manually open (counter-clockwise) the Y-Pattern valve (blue handle) to start the flow of LN
2
.
3. As the UltraDoser fills, remove the dosing head heater and nozzle. Clean and dry both before
reinstalling. See “Nozzle Cleaning Procedure,” page 5, for additional information.
4. Wait until the UltraDoser unit is filled with liquid nitrogen, approximately 10 minutes, before
dosing.
IMPORTANT: When the UltraDoser unit is filling, it will vent heavily and there will be a steady stream
of “fog” from the vent. Once the UltraDoser unit is filled, there will be a “wisp” of fog coming from the
vent. If the UltraDoser unit overfills and liquid nitrogen starts dripping out the vent, close the Y-Pattern
valve and call Chart service at +1 408.371.4932.
System Shut Down
1. Manually close (clockwise) the Y-Pattern valve (blue handle).
2. Manually open (clockwise) the ball valve (yellow handle) on the Purge Kit.
IMPORTANT: The supply pressure reading on the 2K controller may read 12 ± PSI due to the added GN
2
pressure.
3. On the 2K controller, go to [Maintenance] [Maintenance Modes] screen (see page 30 for
additional information). “Disable” the dosing valve.
4. Manually close (clockwise) the valve (silver nut) on the CryoDoser arm and power “Off” the 2K
controller.
IMPORTANT: When purging the UltraDoser unit, it will vent heavily and there will be a steady stream of
“fog” from the vent. This “fog” will be cold to the touch if the internal temperature of the UltraDoser unit
is still at or near LN
2
temperatures (-320 ºF; -196 ºC). Once the UltraDoser unit is at or near ambient
temperature, the “fog” will warm up.
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