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venting_pumping_object_box [2023/05/30 14:31] swartzj |
venting_pumping_object_box [2023/06/02 17:13] swartzj |
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* Before you start, make sure that the gate valves named D2341 BGV and D2303 BGV are closed and that the IG is off. | * Before you start, make sure that the gate valves named D2341 BGV and D2303 BGV are closed and that the IG is off. | ||
* The vent valve should also be closed when you begin. | * The vent valve should also be closed when you begin. | ||
- | * Both valves | + | * The valve to the turbo pump TVG should |
The procedure is then as follows: | The procedure is then as follows: | ||
- Close the valve to the roughing pump RV. | - Close the valve to the roughing pump RV. | ||
- Now you can plot the pressure at BPG to monitor the pressure before you open the vent valve. | - Now you can plot the pressure at BPG to monitor the pressure before you open the vent valve. | ||
- | - **Keep a constant eye on the pressure level** as it increases rapidly. | + | - **Keep a constant eye on the pressure level** as it increases rapidly. |
- You can now enter and open the chamber. | - You can now enter and open the chamber. | ||
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* Make sure that the IG is off. | * Make sure that the IG is off. | ||
* When you start, you should have RV closed, FV open and the TGV valve, Vent valve, as well as the gate valves named D2341 BGV and D2303 BGV all closed. | * When you start, you should have RV closed, FV open and the TGV valve, Vent valve, as well as the gate valves named D2341 BGV and D2303 BGV all closed. | ||
- | * Close FV and open RV to start pumping down the object chamber with the roughing pump. You can make a plot of the pressure at BPG at this point. | + | * Close FV and open RV to start pumping down the object chamber with the roughing pump. You can make a plot of the pressure |
* Section D2337 will initially be red with vacuum status: 'Bad vacuum' | * Section D2337 will initially be red with vacuum status: 'Bad vacuum' | ||
- | * The vacuum reading at FPG needs to drop to below 200 mTorr before you can safely turn on the turbo pump. | + | * Wait until the vacuum reading at FPG to drops to below 200 mTorr before you can safely turn on the turbo pump. |
* After turning on the turbo pump, wait for the inner circle of the pump symbol to turn green and the pump to reach 40 000 rpm before you open the valve at TGV. | * After turning on the turbo pump, wait for the inner circle of the pump symbol to turn green and the pump to reach 40 000 rpm before you open the valve at TGV. | ||
* When the pressure decreases to below 10-3 Torr, you should see the pressure bottom out on your BPG plot, you can turn on the IG and also plot its pressure over time. Section D2337 should turn green and the vacuum status should turn to 'Good vacuum' | * When the pressure decreases to below 10-3 Torr, you should see the pressure bottom out on your BPG plot, you can turn on the IG and also plot its pressure over time. Section D2337 should turn green and the vacuum status should turn to 'Good vacuum' | ||
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