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All three
macromolecular stations have been equipped with new Cryostreams
700 series from Oxford Cryosystems.
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http://www.oxfordcryosystems.co.uk/cryo/cryostream/700series
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The temperature is
usually set to 100 K, but can be varied from 80 K to 400 K. The
systems can be programmed to cool down or warm up with a
specific gradient, reach certain set points and hold these for a
certain amount of time.
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The cold gas flow is
variable and can be set to either 5 or 10 L/min (turbo mode).
For temperatures below 100 K the system automatically adjusts
the flow to 10 L/min, for temperatures above 100 K a flow of
5L/min is sufficient to maintain the temperature within 0.1 K.
The cold gas flow can be positioned in many different ways, from
vertical to horizontal.
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Accurate alignment
is being done using the three positioners at the support stand
with the aid of a nozzle alignment tool. This should be done
with an empty pin or loop before mounting a crystal.
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Brief operation
instructions are placed at the controller. They also contain
some information about troubleshooting, but check first with the
MacCHESS personnel on duty before attempting to fix a problem.
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