MTS Series 651 Environmental Chambers - Manual (Page 25)

Series 651 Environmental Chamber 25
Venting the LN
2
after use
After using LN
2
cooling, complete the following steps to prevent coolant from
becoming trapped in the line between the supply tank gas valve and the coolant
solenoid valve.
This procedure must be performed after each test if another test will not be
started within a few minutes.
Do not leave LN
2
coolant in the line after use.
LN
2
left in the line could rupture the line or damage the solenoid when the
liquid warms up and expands.
Always bleed off any LN
2
that may remain in the supply line after testing.
1. When testing is completed, close the liquid withdrawal valve on the supply
tank.
2. Use the controls on the temperature controller to open the solenoid valve.
This allows the coolant in the line to bleed off into the chamber.
CAUTION