MembersOnly.Evaporator History

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October 06, 2014, at 11:23 AM by Arka - Updated diffusion pump oil change protocol
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A:  From the evaporator supply cabinet, get diffusion pump oil.  You will also need a container to dispose of the old diffusion pump oil, a bucket, an adjustable wrench, and a screwdriver.  To change the oil in the diffusion pump, you will first need to get access to the diffusion pump.  First, turn off the water flow through the water lines.  Second, you will need to undo the lower clamp on the short section of thick rubber tubing, and after that you will need to undo the four support bolts that hold the diffusion pump in place.  You will want 2 people doing that, because someone will need to hold the diffusion pump while the other person undoes the bolts.  The diffusion pump will fall if it is not held by someone.  Then remove the two water lines from the edge of the coil wrapping the diffusion pump.  Water will spill out of them, so itís best if you put a bucket under you while you do that.  Once the diffusion pump is free, remove the pieces from the center of the diffusion pump, and pour the old diffusion pump oil into the disposal container.  Then, clean the body and the center pieces thoroughly with ethanol and dry them.  Reassemble the diffusion pump.  Pour 150 cc of diffusion pump oil into the pump.  Replace the pump in the system.  First, get the four support bolts started so that the pump is held by the system.  Next, center the diffusion pump under the fitting, positioning it so it will form a seal.  While positioning the diffusion pump, making sure that the tube off the side is replaced in the small section of rubber tubing.  Once the diffusion pump is settled, begin tightening the support bolts evenly to create a strong vacuum seal.  Reattach the water lines and restart the water, checking for leaks.  Tighten the clamp attaching the short rubber tube to the diffusion pump.  When everything is reattached, start the mechanical pump and monitor TC1.  If it does not drop to 10 microns of vacuum, you should adjust the bolts supporting the diffusion pump, making adjustments until the vacuum returns.  Then start the diffusion pump, let it warm up for 30 minutes.  If the pressure is any higher than 1*10-6 torr, continue adjusting the support bolts.
to:
A:  From the evaporator supply cabinet, get diffusion pump oil.  You will also need a container to dispose of the old diffusion pump oil, a bucket, an adjustable wrench, and a screwdriver.  To change the oil in the diffusion pump, you will first need to get access to the diffusion pump.  First, turn off the water flow through the water lines (yellow tubes), then remove the two water lines from the edge of the coil wrapping the diffusion pump.  Water will spill out of them, so itís best if you put a bucket under you while you do that.  Second, you will need to undo the upper clamp on the short section of thick rubber tubing, vent the system with the venting valve, and then undo the four support bolts that hold the diffusion pump in place.  You will want 2 people doing that, because someone will need to hold the diffusion pump while the other person undoes the bolts.  The diffusion pump will fall if it is not held by someone.  Once the diffusion pump is free, remove the pieces from the center of the diffusion pump, and pour the old diffusion pump oil into the disposal container.  Then, clean the body and the center pieces thoroughly with ethanol and dry them.  Pour 150 cc of diffusion pump oil into the pump.  Reassemble the diffusion pump, taking care to align the bottom component with the notch at the base of the pump.  Replace the pump in the system.  First, get the four support bolts started so that the pump is held by the system.  Next, center the diffusion pump under the fitting, positioning it so it will form a seal.  While positioning the diffusion pump, making sure that the tube off the side is replaced in the small section of rubber tubing.  Once the diffusion pump is settled, begin tightening the support bolts evenly to create a strong vacuum seal.  Reattach the water lines and restart the water, checking for leaks.  Tighten the clamp attaching the short rubber tube to the diffusion pump.  When everything is reattached, start the mechanical pump and monitor TC1.  If it does not drop to 10 microns of vacuum, you should adjust the bolts supporting the diffusion pump, making adjustments until the vacuum returns.  Then start the diffusion pump, let it warm up for 30 minutes.  If the pressure is any higher than 1*10-6 torr, continue adjusting the support bolts.
July 20, 2010, at 11:34 AM by 130.126.229.61 -

Page last modified on October 06, 2014, at 11:23 AM