WFI Grism Mounting
Procedure

Grism Mounting Procedure duration: Aprox. 60 minutes

For this delicate operation you need an experienced TIO

(1) Call the mechanics, they will dismount the WFI with tools stored in the fiber room(Integration Room).

(2) In the Dome:

Follow up the Safety instruction for working the Dome Area. Don't forget your Helmet and your safety shoes.
Put the telescope lock pins IN.
Let the mechanic team remove all the screws from WFI chassis.
Remove the nitrogen gas hose. No others cables or hoses must be disconnected.
The WFI must be mount over the carriage and attach to it (take care with cables and fibers).
Take out the Grism Unit from the storage room, call for help it is necessary.
Be sure that the protective shutter is close.
Take care with your fingers, don't talk or smoke over the Grism surface.

Put the Grism Unit directly over the central axis of the instrument.

Be sure that the aligment of the grism is Ok (see if the marks are colineal).

Put all the Grism screws around the flange.

Lift the instrument and reinstall the screws that connect the instrument to the telescope.

Disconnect the carriage from the instrument.

Now the Grism is installed in the instrument.

No telescope balance or other adjustment it is necessary.

Put the telescope lock pins OUT.

Remove all the objects or carriages around the telescope.

Store the special tools in the fiber room (Integration Room). (No other tools or spare are available)