Low Pressure Ln2 Supply Filling Method (8127); Funnel Filling Method - Thermo Scientific Thermo Dewars TY509X1 Mode D'emploi

Section 3
Operation

Funnel Filling Method

Low Pressure LN2 Supply
Filling Method (8127)
3-6 Cryogenic Transfer Vessels
The Thermo 8127 cylinders can be filled by removing the brass plug on
the top center of the tank and inserting a funnel through the hole. Liquid
nitrogen can then be poured directly into the cylinder through this hole.
Be sure to stand clear of the vent during filling and always wear proper
safety attire while handling liquid nitrogen.
1. Open vent valve completely, releasing any pressure built up inside the
cylinder.
2. Remove brass plug located on the top center of the cylinder.
3. Insert funnel into hole.
4. Pour liquid nitrogen into cylinder until level gauge reads 7/8 full or
until liquid nitrogen begins spitting from the vent valve.
5. Reinsert and tighten the brass plug.
6. Close vent valve completely.
The Thermo 8127 liquid nitrogen cylinders can be filled from a
pressurized source of liquid nitrogen by attaching a transfer hose to the
liquid withdrawal valve on the Thermo cylinders. The liquid nitrogen
source pressure must not exceed 45 PSI. Read all instructions carefully
before filling.
1. Attach transfer hose from liquid nitrogen source to the liquid
withdrawal valve on the Thermo cylinder.
2. Open withdrawal valve on Thermo cylinder completely.
3. Open withdrawal valve on liquid nitrogen source. Liquid nitrogen
source pressure must not exceed 45 PSI, since damage to Thermo
cylinder gauges will occur. Optimum feed pressure is 35 PSI.
4. Open vent valve on Thermo cylinder until the pressure gauge on
Thermo cylinder reads 22 PSI.
5. Continue to fill until Thermo cylinder weight is 180 pounds for the
8127. If the scale method is not possible, fill until liquid nitrogen
begins spurting from vent valve.
6. Shut liquid nitrogen source valve completely.
7. Shut liquid nitrogen withdral valve on Thermo cylinder completely.
8. Carefully remove transfer hose from the Thermo cylinder. Some liquid
nitrogen will remain in the hose under pressure after filling
9. Close vent valve completely.
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