Withdrawal Device; Installation - Thermo Scientific Thermo Dewars TY509X1 Mode D'emploi

Section 3
Operation

Withdrawal Device

Installation

3-2 Cryogenic Transfer Vessels
The liquid discharge device provides liquid nitrogen for filling cold traps
and smaller dewars without having to scoop out or pour liquid nitrogen
from the vessel. The liquid discharge device utilizes the normal evaporation
of the cryogenic liquid to pressurize a container by plugging the neck of
the vessel and forming a hermetic seal. The pressurized vessel can then
decant product through the liquid discharge device. Figure 1 shows a
drawing of the liquid discharge device. The primary components of the
liquid discharge device are listed below:
Rubber Stopper: Provides a seal against the walls of the necktube.
Tightening the wingnut expands the rubber stopper.
Pressure Gauge: Indicates the pressure inside the container.
Relief Valve: Relieves pressure inside the container automatically when
excessive pressure is reached.The relief valve is a safety device and cannot
be adjusted.
Vent Valve: Provides means to vent product. The vent valve can be closed
to pressurize the vessel or opened to depressurize the vessel.
Discharge Valve: Allows product to flow out of the vessel through the
discharge device spout.
Safety Cable: Prevents discharge device from accidently exiting completely
from vessel.
Perform the following steps to install the liquid discharge device on a
vessel:
1. Attach the discharge device spout to the liquid discharge device (refer
to Figure 1 for location). A transfer line can be used in place of the
discharge device spout.
2. Verify that the rubber stopper is dry and free from grease and other
contaminants. Check for nicks and gouges that may impair normal
operation.
3. Verify that the cable is in good working condition.
4. Verify that the vent anddischargevalves turnfreely.
5. Loosen wingnut.
6. Lower discharge device into vessel. As the discharge device is lowered,
the nitrogen in the vessel will boil until the diptube has cooled down.
The boiling action is normal. Continue lowering until the rubber
stopper fits snugly.
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