Removal and Storage

• Your last command to the PN.S-PC should be STATUS - check that both mask and shutter are closed! If this is not done the optics may be unprotected when the instrument is being handled.
• The observatory team will remove the cryostats, and will need to find the cover plates and screws. They will then remove the instrument and again will need to find the cover plate and screws. Best place for the covers and screws is on top of the PN.S cupboard. Store the nitrogen tube for the cryostats in the cupboard.
• Normally the cables and 19" rack will remain on the Cass. If they need to be removed, store the cables in the cupboard and the 19" rack near the instrument on the ground floor. Ask the staff to flush the instrument with nitrogen at regular intervals.
• The cables connecting the PN.S-PC with the observing room "break-out box" should be carefully disconnected, and stored in the designated place. Note that the Special cable for the PN.S PC (25-pin Y-piece) is custom made and that the instrument depends on it. The PC itself, and the monitor, needs to be stored somewhere out of view.
• Run through the list of items which are supposed to be in the cupboard and warn the team if there is anything missing!
• We believe that continuous flushing with dry air/nitrogen via the single input gas flange will give the instrument sufficient protection from moisture, as the gas will eventually diffuse through all chambers. A more "planned" arrangement is discussed by J Hart in his email of 30.8.2001. Something still needs to be done about the filters which are not in the body of the instrument.

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