Helium Level Detectors:
Helium level detectors have been added to all of the transport
dewars.
Please read the information and
instructions
for using them. They MUST be plugged in to the "Cryonet" in order to
keeep
their batteries charged. If you will have one in the lab for more than
a day you should use the supplied HLD charger available in CLB 308 if
you don't have a cryonet connection.
The liquid helium transport dewars that are stored in CLB 308 are now
actively read hourly on the hour by the "Cryonet." This means that you
can now monitor dewar deliveries and save yourself some time. From any
computer with web access, you can view the liquid levels of each dewar
in CLB 308 and each has a time stamp for when the level was read. So,
if
you are waiting for a dewar to be delivered, check the data just after
the top of each hour, and if the dewar you were assigned has a current
time stamp and has enough helium in it, it is ready for you to go get
it.
This will also allow us in the Cryogenics facility to know when you are
done with it. Please remember to always plug in the recovery hose and
the
Cryonet connector so that this sytem can work for all of us. Try
it now.
Helium Recovery:
We are collecting all recovered gas at the NPB. Chemistry is using a low pressure gas transfer system located in CLB308. Recovered gas from Chemistry is metered and collected into a recovery balloon. A low pressure compressor compress the gas just enough to send it down the pipe to Williamson. There, it is metered, collected and retransfered in the same manner on to the NPB. The whole system is automated and remotely monitored.
Liquid Helium:
The dewar storage area is CLB308. Requests for helium should be by phone, web or e-mail. Please return unused dewars to room CLB308 as soon as you are done with them, empty or not. The PSI liquefaction equipment is in the NPB. We have a truck for transporting dewars to and from Chemistry.
Monitoring:
Each lab has a gas meter and a remote counter and a cryonet box. The cryonet reads the recovered helium volume, records it to be automatically sent to the NPB for inventorying each workday.