CHART ULTRADOSER 500S, Руководство пользователя

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The UltraDoser
®
500S LN
2
Dosing System unit can be fed by either a portable Dura-Cyl
®
Liquid Cylinder or a
house liquid nitrogen system. Most UltraDoser 500S system installations will utilize portable Dura-Cyl
cylinders.
Dura-Cyl Liquid Cylinder Fed System
IMPORTANT: LN
2
is -320ºF (-196ºC). Any water and/or moisture can cause ice which will affect the
performance of the UltraDoser 500S system. Providing a positive pressure of GN
2
(also known as purging) to
the UltraDoser unit before introducing LN
2
into the body will eliminate many performance interruptions.
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 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.
Typical Dura-Cyl cylinder Installation Set-Up