Fitting the pump
Wear protective clothing, including cryogloves, goggles,
boots and a protective apron.
Ensure that the red pressure relief valve on the pump is
open.
Ensure that power is disconnected from the chamber and
the pump.
Ensure the delivery hose from the pump to the chamber is
securely tightened.
Make sure that the delivery hose is as straight as possible, with no major
high or low spots.
Do not insert the pump rapidly as the liquid nitrogen may
bubble violently.
In one smooth and continuous action, insert the pump evenly into the neck
of the dewar until the microswitch plunger operates on the neck ring. It is
normal for nitrogen gas to issue from the pressure-relief valve.
Press firmly on the top of the pump to hold it level and clip all the springs
onto the dewar, alternating between handles.
Close the pressure-relief valve.
The mains power outlet on the rear of the Chamber must
only be used for connection to a Planer Products pump.
Connect the mains inlet of the pump power supply unit to the auxiliary
power output on the rear of the Chamber.
Always test the dewar after refitting the pump.
1 - 6 Installing the System
