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Topic: Dewar tube

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	AIRS - Technology: Subsystems: Dewar Assembly
		The focal plane assembly operates at 58 K for high sensitivity and is packaged in a permanent vacuum dewar which mates directly to the 155 K grating spectrometer.
		The dewar outer shell is constructed primarily of stainless steel and uses a glass inner bore to accommodate the 58 K/155 K thermal transition.
		Low loss heat transfer from the focal plane to the pulse tube cryocooler is provided through a single crystal sapphire rod connected to the dewar end well.
	www-airs.jpl.nasa.gov /Technology/Subsystems/Dewar (110 words)

	CRYOFAB - Cryogenics for Industry, Research, Laboratory, Medical and Homecare.
		The height of the liquid observed may be converted to a volumetric equivalent by using the calibration chart attached to the dewar.
		Let the tube just contact the ball of the liquid access valve and then open the valve and slowly insert the tube the rest of the way into the dewar until it reaches the bottom.
		Lift the tube slightly off the bottom to insure free flow and tighten the coupling nut to complete the seal around the tube and hold it in place.
	www.cryofab.com /html/manual_14.htm (1578 words)

	Liquid Helium Dewars (Site not responding. Last check: 2007-10-12)
		A liquid helium dewar, a means of mounting the magnet in the dewar, a power supply, a liquid helium level meter/sensor, and a helium transfer tube are basic and necessary.
		Dewars supplied by AMI are constructed from non-magnetic materials with copper and aluminum radiation shields.
		Dewars are generally supplied with a reliable bellows sealed evacuation valve, a safety pressure relief valve and provisions for mounting a thermocouple gauge for monitoring the dewar vacuum.
	www.americanmagnetics.com /magnets/dewars.html (274 words)

	Instructions for transfering liquid helium
		Measure the liquid level in the transport dewar manually and record it on the transport dewar chart.
		Lower the transfer tube dewar end slowly into the dewar until the pressure begins to increase.
		When the end of the tube in the transport dewar is up to the ball valve, stop there and wait several minutes for the pressure to reduce and for all frost to evaporate from the transfer tube assembly.
	www.phys.ufl.edu /~cryogenics/transfer.htm (821 words)

	Vacuum flask - Wikipedia, the free encyclopedia
		The vacuum flask was invented by physicist and chemist James Dewar in 1892.
		A practical vacuum flask is a bottle made of glass, metal, or plastic with hollow walls; the narrow region between the inner and outer wall is evacuated of air.
		The excellent insulation of the Dewar flask results in a very slow "boil" and thus the contents remain liquid for a long time without the need for expensive refrigeration equipment.
	en.wikipedia.org /wiki/Dewar_flask (548 words)

	Filling the dewar
		Because the geometry of the dewar makes leakage of liquid N2 possible for certain telescope orientations, we recommend that the dewar be filled at the end of the night or at lunchtime rather than just before observing starts to minimize wastage of liquid N2.
		Wheel the 35 liter storage dewar which is currently in use under the CCD dewar on the telescope.
		Turn off the liquid N2 valve on the storage dewar, the vent valve on the storage dewar, and the dry N2 on the S pier and the N2 cylinder downstairs (if storage dewar was pressurized).
	burro.astr.cwru.edu /Schmidt/Schmidt_Manual/filling_dewar.html (862 words)

	Bore Access Options
		The room temperature bore tube is surrounded by one or two radiation shield bore tubes, which are thermally tied to the liquid nitrogen shield.
		The liquid helium bore tube surrounds the radiation shield tubes and the cold bore of the magnet surrounds the entire room temperature bore assembly.
		A insert dewar of this type can be used for experiments in the temperature range from 2K to 5K by filling with liquid helium and pumping or pressurizing as required, or operate at 77K by inserting liquid nitrogen.
	www.americanmagnetics.com /tutorial/access.html (805 words)

	PSFC Cryogenic SOP
		Liquid nitrogen transfer tubes shall be covered with insulation to prevent contact with the metal surface of the tube and to avoid condensation of oxygen at the surface.
		The end of the transfer tube which is inserted into the Dewar should be cut at a sharp angle so that tube end does not rest flat against the bottom of the Dewar.
		The tube must be lowered slowly into the Dewar, otherwise the liquid will boil off rapidly, with the result that cold gas will freeze the rubber and break the seal, a potentially hazardous condition.
	alcpc1.psfc.mit.edu /esh/cryo.html (2207 words)

	LHe_Fill
		Slowly insert the flutter (thumper) tube into the liquid helium fill port until it touches the bottom of the can, then place an alligator clip on the tube, which is level with the top of the fill port.
		The filling-port tube is thin-walled stainless steel and is easily punctured with sharp objects.
		The increased exhaust is accompanied by an increase in the density of the exhaust cloud.
	www.chemistry.nmsu.edu /Instrumentation/LHe_Fill.html (2594 words)

	Liquid Nitrogen Dewars - SPI Supplies
		The other, a pressurized dewar and of a type that is not offered by SPI Supplies, is a closed vessel, where liquid nitrogen becomes a boiling liquid at a temperature determined by the pressure within the vessel.
		This type of dewar is regulated as pressure vessels, because there is the potential for a substantial pressure to develop within them, and generally they are protected by a pressure relief valve.
		When using the dewars as a "refrigerator" or when the need arises for other reasons, we recommend Apiezon® N Cryogenic High Vacuum Grease, which is both silicone and halogen free.
	www.2spi.com /catalog/instruments/liquid-nitrogen-dewars.shtml (1247 words)

	TEA: Leppik- -- 12.7.2000
		To accomplish this, inside the dewars where the mixer for each receiver is, there is a container to hold liquid helium.
		The first step to filling the dewars with liquid helium is to attach a pipe to the 250 L dewar.
		After each dewar to be filled has its helium, the pipe is removed from the 250 L dewar, and the valve shut.
	tea.armadaproject.org /leppik/12.7.2000.html (492 words)

	Liquifying Oxygen (Site not responding. Last check: 2007-10-12)
		A test tube and balloon full of oxygen gas are suspended from the ceiling.
		The test tube is carefully lowered into a Dewar flask of liquid nitrogen.
		When you lower the flask away from the test tube, a pale blue liquid is visible in the tube...
	www.kyantec.com /Tips/LiquifyingOxygen.htm (384 words)

	NMR Facility - Southern Illinois University Carbondale
		Equip the helium transfer tube with a tygon feed line from a helium gas tank and gradually insert the transfer apparatus into the supply dewar.
		Fill-person #1 ascends the ladder with the transfer tube in hand, removes the magnet hardware, and prepares to insert tube into magnet while fill-person #2 moves the dewar into position.
		Greater helium consumption may indicate that the vacuums of either the magnet dewars or the transfer tubes are degrading.
	opie.nmr.siu.edu /procedures.html (1654 words)

	LHe Transfer Line Handling Tips (Site not responding. Last check: 2007-10-12)
		It is very important that the non-flexible tubes are inserted into the storage and magnet dewars in a straight up and down motion.
		Using proper equipment to protect the operators from frostbite, have the personnel on the storage dewar leg carefully guide the tube into the storage dewar until it is slightly submerged in liquid helium.
		Allow the transfer tube to cool until a plume is noticed on the magnet dewar side leg of the transfer tube.
	www.cryomagnetics.com /transfer.htm (394 words)

	Inadequate Analysis Contributes to Dewar Failure
		This dewar design employed a single fill-tube that also served as a boil-off vent tube for the liquid helium.
		A burst disk on the dewar’s outer vacuum jacket operated properly, relieving pressure and limiting the damage to internal components housed within the dewar’s external jacket.
		A boil-off of liquid helium occurred when an ice dam in the vessel fill/vent tube isolated the system’s relief valves, causing the dewar to become over-pressurized.
	www.llnl.gov /es_and_h/lessons/04_9_dewar_failure.html (449 words)

	cool
		dewar to blow-out tube with rubber transfer tube.
		Open the valve on dewar and check if gas is venting through one-way valve on He exhaust port.
		Use a rubber tube with a small cut on it to connect the other port.
	darkwing.uoregon.edu /~tli/cool.htm (579 words)

	Standard Operationg Procedure for the Low-temperature Probe Station
		Close the valve to the relief port on the dewar for the duration of the transfer.
		When the tube is at a height compatible with the large diameter section at the end is fully inside the compression fitting.
		Remove the transfer tube from the dewar, close all valves on the dewar except the relief vale, and cover the cryostat inlet port with A1 foil.
	www.enme.umd.edu /mml/SOP/vacuum-prober/vacuum-prober.html (1865 words)

	Crystal Growing Guide (Site not responding. Last check: 2007-10-12)
		The sample is placed at the sealed end of the tube and is followed by a glass wool plug which cleans the tube as it is pushed along and serves to prevent bulk/crude material blowing along the tube itself.
		The sealed end of the tube (where the sample is) and the copper jacket are then heated in an oil bath (vertical set-up) or in a tube furnace (either horizontal or vertical).
		Since the tube has a temperature gradient ranging from the temperature of the solvent at the heater element to almost room temperature near the bottom of the 'large tube' crystals will grow, if the gods are with you, in this part of the tube.
	www.udel.edu /chem/xray/Crystal_Growing_Guide.htm (2643 words)

	Liquid Nitrogen Safety
		Tube explosions are thought to be caused by liquid nitrogen entering the tube through minute cracks and then expanding rapidly as the tube thaws.
		Persons filling Dewars should wear full length non-cuffed trousers (covering tops of shoes) or full length apron, and shoes which will not admit spilled cryogen and which are easy to remove quickly.
		Inside buildings, from room to room, the best transport is by Dewars which either have carrying handles (4 L and less) or are on wheels (larger Dewars), and which have pressure relief valves or pressure venting lids.
	www.chem.purdue.edu /chemsafety/Chem/ln2.htm (1233 words)

	Terry's LJ - Dewar follies
		Unfortunately, most of the Berkeley cond-mat labs are in Birge Hall, which has no loading dock, so that the LN dewars arrive on the first floor of neighboring LeConte where they must be wheeled over to their destination by some low-seniority student.
		When rolled onto the stairs, the dewar promptly tipped over and plummeted downward on its side, knocking deep gouges in the marble steps and dragging along the unfortunate student, who inexplicably held on as his cargo began to tumble.
		Miraculously both student and dewar arrived at the landing without rupturing, but the dewar was still on its side and pressure was building up.
	tdj.livejournal.com /1256979.html (474 words)

	Vacuum Tube, Schlenk (Site not responding. Last check: 2007-10-12)
		Tubes are constructed of medium wall borosilicate glass and perform well under both thermal and pressure-type reactions.
		The 25 and 50 mL tubes have 0-4 mm valves with 826601-0004 plugs.
		The 100 and 350 mL tubes have 0-8 mm valves with 826601-0008 plugs.
	www.kontes.com /html/pg-218710.html (106 words)

	LS-ESH-0031
		Close the storage dewar vent valve, open its top valve, and carefully insert the liquid He transfer line.
		Gently insert the transfer line until it is reaches the bottom of the liquid He storage dewar, and then back it off slightly to avoid picking up ice that may be at the bottom.
		Close the liquid He storage dewar vent valve and disconnect the helium gas line from the storage dewar vent line connection.
	www.nsls.bnl.gov /newsroom/publications/manuals/prm/LS-ESH-0031.htm (2560 words)

	Parabolic trough
		It is constructed as a long parabolic mirror (usually coated silver or polished aluminum) with a Dewar tube running its length at the focal point.
		Sunlight is reflected by the mirror and concentrated on the Dewar tube.
		Heat transfer fluid (usually oil) runs through the tube to absorb the concentrated sunlight.
	www.danceage.com /biography/sdmc_Dewar_tube (261 words)

	Magnets
		A 30 liter helium supply dewar is large enough to fill some of the smaller cryostats which hold approximately 52 liters of liquid helium.
		Use a thin non magnetic rod to confirm that the nitrogen vessel neck tubes are free of ice blockages.
		The supply dewar may also have ice on its bottom and it is possible to plug the helium transfer line if its end comes in contact with the ice.
	www.chem.purdue.edu /nmrfac/magnets.htm (3520 words)

	Polyarylmethyl Undecet Decaradical
		A foam cap was placed over the top of the dewar and the dewar was quickly tilted, with the hope that part of the polyradical sample would move over into the sample tube compartment.
		Once there was good amount of polyradical sample inside the EPR tube, which was typically viscous solution on the wall of the tube, a sample band was formed by repetitive application of temperature gradients to the wall of the tube.
		We even got a tall dewar with a narrow strip of small viewing windows, a much smaller and lighter than the the one used before; however, the outcome was not much different.
	www.chem.unl.edu /rajca/Gomberg/S5.html (2639 words)

	Sample Cooling
		In most cases direct contact of the LN Dewar with the sample achieves the highest rate of heat transfer and the most rapid cooling to the lowest temperature.
		Dewars are fabricated from composite, explosively-bonded OFE copper to stainless steel.
		This dramatically lowers the temperature of the Dewar and increases its capacity for thermal transfer.
	www.thermionics.com /cool.htm (605 words)

	EPR temperature controller accessories page
		With the dewar insert holder, the dewar is mounted to an X-band waveguide-type cavity.
		The helium flow is controlled via a needle valve which is located in the lower part of the transfer tube that is immersed in the liquid helium tank.
		The ER 4118 is a continuous flow liquid helium cryostat, compatible with all FlexLine resonators and Q-Band resonators.
	www.bruker-biospin.com /brukerepr/temperature.html (498 words)

	Goddard Infrared Camera
		It should be an orange tube somewhere on the east side of the lab (at least, that’s where we got it).
		Make sure the end going into the helium dewar is clean and NEVER touches the floor or anything else but air.
		After the dewar is full, remove both ends of the transfer rod and turn off the red valve (red handle) and turn on the first emergency release valve (yellow handle).
	spider.ipac.caltech.edu /staff/brentb/gircam/gircam.htm (1617 words)

	GWR Instruments, Inc. Home Page
		The Dewar is constructed mostly of aluminum with two radiation shields situated between the outer shell and the inner liquid helium reservoir.
		The tilt of the Dewar is controlled by varying the lengths of the two leveling units relative to the third fixed point upon which the Dewar sits.
		During installation of the instrument, the gravity meter is aligned precisely with the gravity vector by manually adjusting the height of the levelers with the micrometers.
	www.gwrinstruments.com /GWR_ctspec.html (6836 words)

	Cryostats
		A non-magnetism FRP liquid helium Dewar which is used for SQUID detectors.
		Liquid Helium Dewar in which multishields are used which are thermally connected to the neck of the Dewar.
		Experimental apparatus of the multistage pulse tube refrigerator.
	www.amacintl.com /products/cryostats.html (240 words)

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