Differences

This shows you the differences between two versions of the page.

--- venting_pumping_object_box [2023/06/01 13:43]
swartzj
+++ venting_pumping_object_box [2023/06/01 15:50]
swartzj
@@ Line 21: / Line 21: @@
   * 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.
   * Section D2337 will initially be red with vacuum status: 'Bad vacuum'. This must turn to yellow with status 'Poor vacuum'. Wait for the pressure reading at BPG to drop to below 100 mTorr before you close RV and open FV.
-  * 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.
   * 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'.
 {{ :20230525_155711.jpg?600 |The object chamber vacuum control page}}

S800 Documentation