Purging with Gaseous Nitrogen
The UltraDoser unit must only be purged with gaseous nitrogen. Chart recommends the UltraDoser unit
be purged when not in use. However, this may not be practical for all operators. At a minimum, the
UltraDoser unit should be purged to eliminate any water that may be inside the unit after installation and
prior to startup,. The UltraDoser reservoir may also require purging when there is liquid nitrogen flowing
out of the vent. The UltraDoser reservoir must also be purged when the nozzle becomes frozen shut.
1. Attach the C-Flex hose (½” female flare side) to the house GN
2
system or portable GN
2
cylinder.
**Note: this step will require additional fittings such as ½” male flare fitting and compression
fittings.
2. Flow GN
2
(20 psi; 1.38 bar) through the UltraDoser body for approximately ten (10) minutes
before system start up.
IMPORTANT: The supply pressure reading on the 2K controller may read 12 ± PSI due to the added GN
2
pressure.
IMPORTANT: When purging the UltraDoser unit, it will vent heavily and there may 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.
System Start Up
1. Place the On/Off switch on the 2K controller in the “On” position. Ensure the “Dosing Disable”
push button is pushed in to disable dosing.
2. Insert the supplied 10 micron filter into the male bayonet on the supplied C-Flex hose using a 1/8”
allen wrench.
3. Attach the C-Flex hose (male bayonet side) to the UltraDoser unit with the supplied bayonet
clamp and gasket.
4. Attach the C-Flex hose (female flare fitting side) to the 22psi LN
2
Dura-Cyl dewar.
5. Open the liquid valve (counter-clockwise direction) on the Dura-Cyl dewar.
6. Wait until the UltraDoser unit is filled with liquid nitrogen, approximately 10 minutes.
7. Adjust the dosing parameters. See “2K Controller Adjustments”, page 24, for additional
information.
8. Pull out the “Dosing Disable” push button to enable 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 liquid valve
on the Dura-Cyl dewar and call Chart service at +1 408.371.4932.
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