gas_handling_system
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gas_handling_system [2013/12/13 21:16] pereira |
gas_handling_system [2013/12/13 21:28] pereira |
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| * Follow instructions under [[# | * Follow instructions under [[# | ||
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| * Monitor the pressure of the focal plane vacuum chamber (as read out via the I264IG ion gauge) while detectors are being filled with gas; the pressure normally stays below 5E-5 Torr. | * Monitor the pressure of the focal plane vacuum chamber (as read out via the I264IG ion gauge) while detectors are being filled with gas; the pressure normally stays below 5E-5 Torr. | ||
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| * To zero this display: | * To zero this display: | ||
| * Click on the **Slot 3 (PT1)** tab to access the details page for PT #1 | * Click on the **Slot 3 (PT1)** tab to access the details page for PT #1 | ||
| - | * Click the Zero Sensor button | + | * Click the **Zero Sensor** button |
| - | * Click the Valves tab at the top of the LabView window to return to the overview display of the gas handling system | + | * Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system |
| * Close **valve 6** | * Close **valve 6** | ||
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| * Click button labeled **Return to AUTO Mode** on left to start filling/ | * Click button labeled **Return to AUTO Mode** on left to start filling/ | ||
| * Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system to monitor filling. The flow readings for MFC #1 will increase and eventually disappear as the readout value overflows the display field (this is normal behavior) | * Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system to monitor filling. The flow readings for MFC #1 will increase and eventually disappear as the readout value overflows the display field (this is normal behavior) | ||
| - | * If necessary, the filling process can be stopped at any time by pressing the valve button labeled Close MFC #1 | + | * If necessary, the filling process can be stopped at any time by pressing the valve button labeled |
| * Open **valve 9** | * Open **valve 9** | ||
| * The filling process will take several minutes | * The filling process will take several minutes | ||
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| * When the detector is filled, close **valve 5** | * When the detector is filled, close **valve 5** | ||
| - | Filling CRDC1 and CRDC2 with Gas | ||
| - | Follow instructions under PREPARATIONS FOR FILLING DETECTORS WITH GAS above | + | |
| - | Monitor the pressure of the focal plane vacuum chamber (as read out via the I264IG ion gauge) while detectors are being filled with gas; the pressure normally stays below 5E-5 Torr. | + | ===== Filling CRDC1 and CRDC2 with Gas ===== |
| - | Confirm that the detector pressure as indicated by the display labeled P.T. #2 reads below a couple of Torr | + | |
| - | To zero this display: | + | * Follow instructions under [[# |
| - | Click on the Slot 4 (PT2) tab to access the details page for PT #2 | + | |
| - | Click the Zero Sensor button | + | |
| - | Click the Valves tab at the top of the LabView window to return to the overview display of the gas handling system | + | |
| - | Close valve 22 | + | * Confirm that the detector pressure as indicated by the display labeled P.T. #2 reads below a couple of Torr |
| - | Open valves 10 and 15 | + | |
| - | Open valve 12; the flow reading at MFC #2 should jump momentarily | + | |
| - | Open valve 17; the flow reading at MFC #3 should jump momentarily | + | |
| - | Fill CRDCs | + | |
| - | Enter the desired fill pressure and start the automatic filling process | + | |
| - | Click on the tab labeled Virtual Ch. 0 (CRDC) to access the page with the pressure set point control | + | * Close **valve 22** |
| - | Enter the desired pressure (typically 40 Torr) in the field under the knob labeled Set Point | + | |
| - | Click button labeled Return to AUTO Mode on left to start filling/ | + | * Open **valves 10 and 15** |
| - | Click the “Valves” tab at the top of the LabView window to return to the overview display of the gas handling system to monitor filling | + | |
| - | The flow readings for MFC #2 and MFC #3 will increase | + | * Open **valve 12**; the flow reading at MFC #2 should jump momentarily |
| - | The LabView application controls the gas mixing ratio based on the flow ratio (scaled with a calibration constant) | + | |
| - | If necessary, the filling process can be stopped at any time by pressing the valve button labeled Close MFCs #2 & #3 | + | * Open **valve 17**; the flow reading at MFC #3 should jump momentarily |
| - | Open valve 25 | + | |
| - | The filling process will take several minutes | + | * Fill CRDCs |
| - | When the detector is filled, close valve 21 | + | |
| + | * Click the **Zero Sensor** button | ||
| + | * Click on the tab labeled | ||
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| + | * When the detector is filled, close **valve 21** | ||
gas_handling_system.txt · Last modified: 2023/05/11 11:29 by pereira
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