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installation_fp_sci [2017/03/06 12:26]
pereira [Vent focal-plane chamber] 		installation_fp_sci [2017/03/06 12:30]
pereira [Open focal-plane chamber]
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   * Gently open the manual venting valve until the pressure displayed in the Pirani Gauge (see figure below) increases by ~1 torr every 15 seconds (see figures below)    * Gently open the manual venting valve until the pressure displayed in the Pirani Gauge (see figure below) increases by ~1 torr every 15 seconds (see figures below) 
 {{:wiki:fp-pirani.jpg?350|FP chamber manual venting valve}}  {{:wiki:fp-pirani.jpg?350|FP chamber manual venting valve}} 
-  * Wait until the chamber is vented (few hours). The **I261PG** Pirani Gauge should read atmospheric pressure. The window **VENT STATUS** in PanelMate should display "VENT VALVE OPEN". The window **PUMPDOWN STATUS** should display "PUMPDOWN STOPPED"+  * Wait until the chamber is vented (few hours). The **I261PG** Pirani Gauge should read slightly above atmospheric pressure (due to the dry N2 flow pumped to the chamber). The window **VENT STATUS** in PanelMate should display "VENT VALVE OPEN". The window **PUMPDOWN STATUS** should display "PUMPDOWN STOPPED"
  
 ==== Open focal-plane chamber ==== ==== Open focal-plane chamber ====
  
-  - After venting the FP chamber, there might still be some pressure differencial. This can be corrected by "forcing" the chamber flange {{:wiki:screwdriver-flange.jpg?350}} +  * After venting the FP chamber, the pressure inside the chamber is slightly above atmospheric due to the dry N2 pumped. Before opening the chamber, it is recommended to vent the extra N2 by "forcing" the chamber flange with e.g. a screwdriver {{:wiki:screwdriver-flange.jpg?350}} 
-  - Unlock the padlock protecting the power brakers of the switch controls to open the chamber, and press the **START** button {{:wiki:padlock-note.jpg?350|Padlock}} +  * Unlock the padlock protecting the power brakers of the switch controls to open the chamber, and press the **START** button {{:wiki:padlock-note.jpg?350|Padlock}} 
-  - Turn the switch to open the clamps holding the FP chamber. The weight held by the hydraulic piston will increase {{:wiki:switch-clamps.jpg?250|Switch clamps}} {{:wiki:clamps.jpg?400|Clamps holding FP chamber}} {{:wiki:scale.jpg?350|Scale FP chamber}} +  * Turn the switch to open the clamps holding the FP chamber. The weight held by the hydraulic piston will increase {{:wiki:switch-clamps.jpg?250|Switch clamps}} {{:wiki:clamps.jpg?400|Clamps holding FP chamber}} {{:wiki:scale.jpg?350|Scale FP chamber}} 
-  - Turn on the switch to activate the motor opening the chamber. It takes about 10 minutes to get the chamber totally opened {{:wiki:fp-chamber-motor.jpg?250|Motor switch to open FP chamber}}+  * Turn on the switch to activate the motor opening the chamber. It takes about 10 minutes to get the chamber totally opened {{:wiki:fp-chamber-motor.jpg?250|Motor switch to open FP chamber}}
  
  
installation_fp_sci.txt · Last modified: 2023/08/18 10:19 by noji

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