public:lemmon:minnesota_60:2mass_ln2_fill_instructions_with_pictures
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| - | ======Instructions for Filling 2MASS with LN2====== | ||
| - | - Lift LN2 dewar on top of blue adjustable cart and wheel it close to the instrument. | ||
| - | - Hook up yellow rubber hose to LN2 tank. It should already be hooked to the instrument, but if not hook up to the LN2 fill port.{{ : | ||
| - | - Take off small silver clamp that is on the yellow hose.{{ : | ||
| - | - Hook up the N2 clear hose to the venting port on the LN2 dewar. {{ : | ||
| - | - Open the LN2 dewar to start filling 2MASS. | ||
| - | - Open the small venting valve on the dewar, on this dewar its the small gold valve right next to where the clear hose attaches. | ||
| - | - Turn on the N2 by the pier by turning the grey handle to open the cannister. | ||
| - | - Watch the LN2 dewar very carefully, and adjust the gold handle on the N2 as needed so the pressure read out on the LN2 dewar maintains at 9 psi. Note in the picture below it's reading at ~5 psi.{{ : | ||
| - | - On the north end of the room, there is a table and on it is a blue binder. | ||
| - | - When 2MASS is full LN2 will come out of a port on the camera, this is normal. | ||
| - | - Close the small gold valve on the LN2 dewar next to where the clear hose attaches and detach the clear hose from the LN2 dewar. | ||
| - | - Turn off the flow of LN2 by closing the handle on top of the dewar. | ||
| - | - Record the end time in the blue binder. | ||
| - | - Make sure it's filled every 24 hours. | ||
| - | - Put silver clamp back on yellow hose after it's thawed out enough. Detach the hose from the dewar end. | ||
| - | - Clean up dome so things are out of the way for use that night.{{ : | ||
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| - | ======If Dewar is Taking a Long Time to Fill====== | ||
| - | - Are you out of LN2? Pick up the dewar and shake it to guestimate how much is in there. | ||
| - | - Is there an ice plug? If it's taken ~45 minutes and the dewar is still not full, you might have an ice plug. If you suspect there is an ice plug, call someone in MtnOps for assistance. | ||
public/lemmon/minnesota_60/2mass_ln2_fill_instructions_with_pictures.1564505865.txt.gz · Last modified: 2019/07/30 09:57 by davner
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