CHART ULTRADOSER 500S, Руководство пользователя

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www.chartdosers.com PN 15920 Page 38 of 43
Nozzle Cleaning Procedure
1. Remove the nozzle from the UltraDoser. See “Nozzle Change Out Procedure” on page 36.
2. Clean the nozzle opening with a very thin wire and blow dry nitrogen through it.
3. Thoroughly dry the nozzle with dry nitrogen gas before re-installing.
IMPORTANT: Any moisture left on the nozzle will immediately freeze up when the nozzle is re-installed
which may cause the nozzle to unthread and fall out.
Purging the UltraDoser
®
LN
2
Dosing System 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 CryotechFlex 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: 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.