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5.3.5.1 Draining the LN 2 Dewars<br />
The <strong>Leica</strong> <strong>EM</strong> <strong>HPM100</strong> operates with two LN 2 Dewars, one storage Dewar (20 ltr)<br />
and a process Dewar (10 ltr).<br />
Two valves at the back panel of the instrument allow draining of both Dewars.<br />
Storage Dewar<br />
drain valve<br />
Process Dewar<br />
drain valve<br />
Place a small Dewar or LN 2 bucket under the hose and open the storage and/or<br />
process Dewar valves to drain the LN 2 . The LN 2 can be used for other purposes or<br />
disposed of.<br />
Before commissioning the instrument again, close both the storage and process<br />
Dewar valves.<br />
Page 45 <strong>Leica</strong> <strong>EM</strong> <strong>HPM100</strong> Operating Manual Version 12/10
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