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installation_fp_sci [2017/03/06 12:19]
pereira [Vent focal-plane chamber] 		installation_fp_sci [2017/03/06 12:25]
pereira [Vent focal-plane chamber]
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 ==== Vent focal-plane chamber ==== ==== Vent 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}}
   - Open the [[hv_bias|HV Remote Control]] GUI and ensure that the focal-plane detectors are unbiased   - Open the [[hv_bias|HV Remote Control]] GUI and ensure that the focal-plane detectors are unbiased
   - Open the [[gas_handling_system#labview_control_program|Labview gas handling system]] and verify that there is no gas in the CRDCs and IC. Open valves **4** (IC supply), **5** (IC bypass), **6** (IC focal-plane bypass), **20** (CRDC supply), **21** (CRDC bypass), and **22** (CRDC focal-plane bypass). The rest of the valves should be closed   - Open the [[gas_handling_system#labview_control_program|Labview gas handling system]] and verify that there is no gas in the CRDCs and IC. Open valves **4** (IC supply), **5** (IC bypass), **6** (IC focal-plane bypass), **20** (CRDC supply), **21** (CRDC bypass), and **22** (CRDC focal-plane bypass). The rest of the valves should be closed
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   - Ensure that the FP ion gauge (I264IG) is off (see details [[vacuum_control|here]])   - 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** window and begin the venting procedure. The **VENT VALVE I260VV** window will turn red and display "OPEN". The pressure should remain constant because the manual venting valve is still closed   - Open PanelMate and select **S800vac** file in directory \\exp\files\control\ncsdata\General\Qt\Templates. Go to page 07, click on the **VENT STATUS** window and begin the venting procedure. The **VENT VALVE I260VV** window will turn red and display "OPEN". The pressure should remain constant because the manual venting valve is still closed
-  - Gently open the manual venting valve until the pressure displayed in the Pirani Gauge (see figure below) increases by ~1 torr every 15 seconds {{:wiki:fp-pirani.jpg?350|FP chamber manual venting valve}}+  - 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}} 
   - 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 atmospheric pressure. The window **VENT STATUS** in PanelMate should display "VENT VALVE OPEN". The window **PUMPDOWN STATUS** should display "PUMPDOWN STOPPED"
  
installation_fp_sci.txt ยท Last modified: 2023/08/18 10:19 by noji

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