Planer Kryo550-16, Руководство оператора, Страница: 21 / 42

Installing a Planer Pump and Dewar
Connecting the Delivery Hose
Never insert the pump into a dewar until it has been connected to the
chamber.
To avoid damage to the heating element, support the pump carefully while it
is out of the dewar.
If the hose is not already fitted to the Kryo550-16, wrap the male hose thread with PTFE
tap and fix to the LN
2
input on the back of the chamber. Tighten securely with a spanner.
Fit the female ferrule at the other end of the hose, to the outlet on the side of the pump.
Ensure that the fibre washer is fitted to this joint. Tighten securely with a spanner.
Filling the Dewar
When refilling a dewar that already contains liquid nitrogen, you must first
depressurise it and remove the pump as described in
Removing the pump .
Wear protective clothing, including cryogloves, goggles, boots and a
protective apron.
Only fill the dewar with liquid nitrogen and do not exceed 85% of its
capacity.
Fully insert the hose from the main liquid nitrogen storage container into the dewar to
avoid spillage.
Add the liquid nitrogen slowly into the dewar. Cold gas will issue from the dewar. Use a
dipstick to ensure that the dewar is filled to between 50% and 85% of its capacity.
Installing the Kryo550-16 2-3