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venting_pumping_intermediate_image_box [2017/06/12 14:52] pereira [Vent focal-plane chamber] |
venting_pumping_intermediate_image_box [2017/06/12 14:55] pereira |
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- | ===== Venting/ | + | ====== Venting/ |
The procedures to vent/pump the S800 Intermediate Image box, and/or filling the PPAC detectors with gas must be done carefully to ensure that the PPACs are not damaged. For instance, before venting the chamber, we have to make sure that the PPACs are empty and equalized with respect to the vacuum in the chamber. In order to avoid errors, an automated gas handling system (II-GHS) was designed to perform these tasks safety. The system is schematically illustrated in the figure below. It shows the status of the valves (red: closed, white: open) when the intermediate image chamber is under vacuum and the PPACs are filled with gas: | The procedures to vent/pump the S800 Intermediate Image box, and/or filling the PPAC detectors with gas must be done carefully to ensure that the PPACs are not damaged. For instance, before venting the chamber, we have to make sure that the PPACs are empty and equalized with respect to the vacuum in the chamber. In order to avoid errors, an automated gas handling system (II-GHS) was designed to perform these tasks safety. The system is schematically illustrated in the figure below. It shows the status of the valves (red: closed, white: open) when the intermediate image chamber is under vacuum and the PPACs are filled with gas: | ||
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- | ==== Vent focal-plane chamber ==== | + | |
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+ | ===== Vent focal-plane chamber | ||
Requirements: | Requirements: | ||
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* Box "VENT STATUS" | * Box "VENT STATUS" | ||
* Turbo gate valve **I214GV** will be automatically closed and pressure in chamber will start rising (as seen in **I215PG**) {{: | * Turbo gate valve **I214GV** will be automatically closed and pressure in chamber will start rising (as seen in **I215PG**) {{: | ||
- | * When pressure in **I215PG** | + | * When **I215PG** |
- | {{: | + | |
* The status in the box "VENT STATUS" | * The status in the box "VENT STATUS" | ||
* You can now open the chamber | * You can now open the chamber | ||