Planer Integra 750Plus, Instructions For Use Manual

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19
Installing the Integra 750Plus
Note If you use a different make of dewar, it may be necessary to fit an adapter ring
to its neck to actuate the microswitch. The lengths of the heater, feed tube and springs
may also need to be changed. If in doubt, consult your supplier.
2.5.1
Attaching the delivery tube
To attach the delivery tube:
1. Check that the freezer has its liquid-nitrogen delivery pipe securely fitted.
2. Support the pump carefully to avoid damage to the heating element near the end of
its inlet tube.
3. Fit the adaptor to the free end of the freezer's liquid-nitrogen delivery pipe and
connect it to the Planer pump, making sure that the fibre sealing washer is
undamaged and correctly positioned. Tighten the gland nut securely.
2.5.2
Putting liquid nitrogen into the dewar
To add the liquid nitrogen
1. Wear protective goggles, boots, gloves and an apron.
2. With the dewar on its platform, fully insert the tube from the storage container into
the dewar in order to reduce the risk of splashing.
3. Add the liquid nitrogen slowly to occupy between 50% and 85% of the total capacity
of the dewar. AVOID THE COLD GAS THAT ISSUES FROM THE DEWAR. Do not
overfill the dewar (above 85% of its capacity), otherwise spillage may occur when the
pump is inserted and there may be insufficient gas space to pressurise the dewar.
No material other than liquid nitrogen should be put into the dewar.
The use of a graduated dipstick is recommended to check the level of liquid nitrogen.
2.5.3
Fitting the pump
NEVER insert the pump into a dewar that contains liquid nitrogen, unless the delivery
tube is attached to the pump and freezer and the red pressure-release valve on the
pump is open.
1. Wear protective goggles, boots, gloves and an apron.
2. Ensure that the pump is disconnected from the mains wall socket.