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venting_pumping_intermediate_image_box [2017/06/12 14:19] pereira [Venting/pumping Intermediate Image box and filling PPACs with gas] |
venting_pumping_intermediate_image_box [2017/06/12 14:51] pereira [Vent focal-plane chamber] |
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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 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 |
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+ | The II-GHS equipment (valves, flow-meter, pipes, etc.) are located on the west balcony of the top level in the S3 vault (see figure below): | ||
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+ | {{: | ||
==== Vent focal-plane chamber ==== | ==== Vent focal-plane chamber ==== | ||
- | | + | Requirements: |
- | * Open the [[gas_handling_system# | + | |
- | * Ensure that the manual venting valve located on the south side of the chamber is closed | + | * Verify |
- | * Ensure that the FP ion gauge (I264IG) is off (see details [[vacuum_control|here]]) | + | |
- | * Open PanelMate and select **S800vac** file in directory \\exp\files\control\ncsdata\General\Qt\Templates. Go to page 07, click on the **VENT STATUS** | + | |
- | * Gently open the manual venting valve until the pressure displayed | + | |
- | {{:wiki:fp-pirani.jpg?350|FP chamber manual | + | |
- | * Wait until the chamber is vented (few hours). The **I261PG** Pirani Gauge should read slightly above atmospheric pressure | + | |
+ | | ||
+ | | ||
+ | * Open **S800Vac** and go to page 03 (" | ||
+ | * Check box " | ||
+ | {{:wiki:iis800vac_pumped.jpg?350|S800vac Panel Mate}}. | ||
+ | * In order to begin venting process, select that box and click "BEGIN VENTING PROCEDURE" | ||
+ | | ||
+ | | ||
+ | * When pressure in **I215PG** reaches | ||
+ | | ||
+ | * You can now open the chamber | ||