Hi Pedro,
Back when we were developing the Stanford Automouting robot,
I ran several tests with thermocouples mounted in Hampton Cu Pins
and loaded into SSRL cassettes. These were placed in a shipping
dewar and the temperature at the bottom and top of two stacked cassettes
was monitored over ti
.
I am not sure, if this thing still exists, but you could use it as a starting
point to search.
Best, Manfred
From: CCP4 bulletin board on behalf of Pedro Matias
Sent: Monday, October 21, 2024 10:41:33 AM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] About
My thanks to Mitchell and Artem for their replies and suggestions. Our
dewars are all CX100.
We are using the weighing method but my concern is that the temperature
at the top of the dewar can reach above 150K even with some LN2 present,
which can lead to the recrystallization of the amorphous
Another good way to test the dry shipping dewar is to its dry/empty weight.
If you don't know your "as new" mass, you can weigh it, then
purge with dry air/nitrogen for 24 hours and check the weight again,
if it is unchanged, then you can use that as your dry/empty weight.
Next you can charge the
Cheapest possible system to check dry shipper would be a wooden stick
lowered into the shipper then taken out and exposed to moist air.
Condensation would indicate a cold zone...
Second cheapest option is a red LED on a pair of long thin wires. If it
changes to green as it dips into the dewar, aga
Dear All,
I'm looking for a low temperature measuring system to check our dry
dewars, preferably one that is not very expensive. Any recommendations ?
Also, I was told that it is possible to regenerate the vacuum in those
vessels. Does anybody have any experience with this? If so, how can it
