Planer Integra 750Plus, Instructions For Use Manual

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Operating the Integra 750Plus
3.1.1
Removing the pump
To remove the pump
1. Wear protective goggles, gloves, boots and an apron.
2. Disconnect the pump power supply from the mains wall socket.
3. Release the pressure in the dewar by opening the red pressure-release valve.
4. Wait until zero pressure is shown on the gauge and the flow of gas has ceased. This
ensures that the dewar is depressurised at the correct rate to prevent violent boiling
of the liquid nitrogen, which can be a severe safety hazard. AVOID CONTACT WITH
THE COLD GAS STREAM.
5. Disconnect the pump from the power supply below the platform.
6. Press firmly on the upper surface of the pump, then remove the spring clips from the
handles on the dewar. To prevent jamming, remove only one spring at a time from
each side.
7. Lift the pump carefully, but firmly, out of the neck of the dewar using a slight twisting
and rocking action. DO NOT TOUCH ANY COLD PARTS.
8. Place the pump in a safe position on its side or suspended vertically (as in the
dewar). NEVER store the pump upside down.
9. Remove frost by using a hot-air gun. Do not overheat, otherwise nylon parts may
melt.
10. When the pump has attained ambient temperature, dry any condensation with
absorbent tissue. If the pump is not dry when you put it back into the dewar (see
Chapter 2: Installing the Integra 750Plus System ), the filter may become blocked
with frozen water.
11. If the dewar is to be left for longer than a few minutes, fit a bung to stop water from
condensing inside the dewar.
3.2 Freezing samples
Never leave the freezer unattended while running a program.
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