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groups:mg:experiment:vacuum [2018/08/13 12:42] – [How to evacuate the vacuum chamber] wfriesengroups:mg:experiment:vacuum [2018/11/01 10:25] (current) – [Oil change of the pre-vacuum pump] fim
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   * Switch on the cold-cathod measuring device when the pressure in the main chamber is below 10^-3 mbar.   * Switch on the cold-cathod measuring device when the pressure in the main chamber is below 10^-3 mbar.
   * Turn on the IGP when the pressure has reached 10^-6 mbar. Initially this will cause the pressure to rise again.   * Turn on the IGP when the pressure has reached 10^-6 mbar. Initially this will cause the pressure to rise again.
 +
 +===== How to refill magnesium in the oven =====
 +  * For opening the oven, at least two people are required.
 +  * The Oven is attached to the chamber with a CF 63 flange. So keep a fresh CF63 copper gasket ready for replacement.
 +  * Pump down the vacuuum chamber following the same procedure as above.
 +  * Open the CF 63 flange connecting oven to the vacuum chamber.
 +  * Oven is extended lengthwise into the vacuum chamber. Gently pull out the tube without hitting the walls of the chamber.
 +  * The oven nozzle is connected in the end of the tube with a nut. Open this nut to take out the nozzle.
 +  * Clean the nozzle as well as the inside of the oven with acetone. Make sure that acetone is fresh and does not contain any water. 
 +  * Also clean any other tools (spoons etc) that you will use to pour magnesium flakes into the oven.
 +  * Now fill the oven to the top and again fix back the nut with the nozzle on it.
 +  * Reconnect the oven flange to the vacuum chamber with a fresh copper gasket. Make sure that the vent gas is turned off before fixing the screws to avoid overpressure in the chamber.
 +
 +{{:groups:mg:experiment:oven_1.jpg?400 |}} {{:groups:mg:experiment:oven_2.jpg?400 |}} {{:groups:mg:experiment:oven_nozzle.jpg?400 |}}
 +
  
 ===== Heating the pumps (usefull for low 10^-9 pressures and below and after opening the vacuum) ===== ===== Heating the pumps (usefull for low 10^-9 pressures and below and after opening the vacuum) =====
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 *Turbomolekularpumpe TMU 260: {{:groups:mg:experiment:turbopump_tmh_tmu_260a.pdf|}}  *Turbomolekularpumpe TMU 260: {{:groups:mg:experiment:turbopump_tmh_tmu_260a.pdf|}} 
 #*In Betrieb seit XY #*In Betrieb seit XY
 +
 +
 +
 +====== Oil change of the pre-vacuum pump ======
 +
 +The oil has to be changed **every third year** approximately. 
 +
 +  -  First, close the big yellow vent at the source chamber. Second, close the pneumatik vents via the knob at the orange power outlet (close to the door) and check if both are really closed. 
 +  -  CLose the black vent of the pump which is placed close to the on/off switch. 
 +  -  Open the drain screw (No. 8 in manul) labed as "Ablaßschraube"  in order to let the oil out. Than close the screw, let the pump run for 10 sec and open it again in order to let out the remainings. You can refill the oil **Pfeiffer Oil P3** when opening the screw no. 6 until you reach a max level at the inspection window. 
 +  -  Open the vents once the preassure at the pump is the same as at the source chamber.
 +
 +Manual: {{ :groups:mg:experiment:pk115bn_part1.pdf |}}
 +
 +Last changes: nov 2018
 +