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What is the correct way to perform a leak check on a vacuum furnace?
Pump the cold furnace down as low as possible, close the vacuum valve and time the rise in pressure from that point to another. Calculate the rise in pressure from point A to B to get a millitorr (micron) per hour amount. This will give you what is called the rate of rise. If the rate of rise isRead more
Pump the cold furnace down as low as possible, close the vacuum valve and time the rise in pressure from that point to another. Calculate the rise in pressure from point A to B to get a millitorr (micron) per hour amount. This will give you what is called the rate of rise. If the rate of rise is to high then do the following:
Connect a helium mass spectrometer into the pumping line in front of the vacuum pumps. Reduce the pressure as low as possible and begin to spray helium around all penetrations of the vacuum vessel starting at the top, as helium rises. Care must be given to the maximum operating pressure of the spectrometer relative to the pressure of the furnace.
See lessWhat is the best method to find a vacuum furnace leak?
Typically the best method is to test with a helium mass spectrometer.
Typically the best method is to test with a helium mass spectrometer.
See lessWhat is the difference between a virtual vacuum leak and a vacuum leak?
A real leak would be defined as air or gas leaking through a vessel from the outside of the vessel into the evacuated space. A virtual leak is not a through the vessel situation, it is gas being slowly released into the evacuated space from a place where it is trapped, e.g. a bolt in a blind hole.
A real leak would be defined as air or gas leaking through a vessel from the outside of the vessel into the evacuated space. A virtual leak is not a through the vessel situation, it is gas being slowly released into the evacuated space from a place where it is trapped, e.g. a bolt in a blind hole.
See lessWhat leak detection methods are considered to be the most effective for locating small leaks?
Small leaks in a vacuum system are easily detected with a helium mass spectrometer. Helium leak detection is very effective
Small leaks in a vacuum system are easily detected with a helium mass spectrometer. Helium leak detection is very effective
See lessWhy would a rotary vane pump smoke?
Most likely the pump is operating at a higher pressure than it was design for. Smoke is typically oil vapor carried by the gas (air) leaving the pump.
Most likely the pump is operating at a higher pressure than it was design for. Smoke is typically oil vapor carried by the gas (air) leaving the pump.
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