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 Chamber, 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 System 1 - 5
