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How many microns needed to reach 10-4 torr?
10-3 Torr is 1 micron, so 10-4 Torr is .1 micron
10-3 Torr is 1 micron, so 10-4 Torr is .1 micron
See lessWhat is the difference between a sensor and a thermocouple in a vacuum furnace?
The words sensor and thermocouple are somewhat generic. A sensor is a device that measures a physical property and responds to it. A thermocouple is a sensor and can be used to measure pressure (vacuum) or temperature. We typically call the vacuum measuring device a vacuum thermocouple gauge andRead more
The words sensor and thermocouple are somewhat generic. A sensor is a device that measures a physical property and responds to it. A thermocouple is a sensor and can be used to measure pressure (vacuum) or temperature. We typically call the vacuum measuring device a vacuum thermocouple gauge and the temperature measuring device a thermocouple.
See lessWhat causes heating elements to fail?
It could be oxidation reducing the surface area and strength of the heating element over time. It could be arcing or shorting to ground. Impact from load carts, parts falling and/or someone bumping them accidentally of course
It could be oxidation reducing the surface area and strength of the heating element over time. It could be arcing or shorting to ground. Impact from load carts, parts falling and/or someone bumping them accidentally of course
See lessWhat is a 460-volt electric heating element?
That would be a heating element rated for 460 volt power. Not typical for vacuum furnaces.
That would be a heating element rated for 460 volt power. Not typical for vacuum furnaces.
See lessWhat materials are used for building heating elements?
Typically in vacuum furnaces it is graphite, molybdenum or tungsten. There are some other options, but they are not as common.
Typically in vacuum furnaces it is graphite, molybdenum or tungsten. There are some other options, but they are not as common.
See lessWhat voltage do heating elements use?
Generally speaking low voltage (less than 100 V) in vacuum furnaces. I suggest that you reference the drawing or contact the manufacturer.
Generally speaking low voltage (less than 100 V) in vacuum furnaces. I suggest that you reference the drawing or contact the manufacturer.
See lessHow to remove contamination from molybdenum rods?
Depending upon the contamination, apply heat. Typically a burn out of the hot zone is a way to remove some types of contamination e.g. hydrocarbons.
Depending upon the contamination, apply heat. Typically a burn out of the hot zone is a way to remove some types of contamination e.g. hydrocarbons.
See lessHow would a leak in the jet assembly affect diffusion pump performance?
If the jet assembly (array) is not properly assembled (or seated) it would allow larger gaps or openings for the flow of oil vapor than designed for. This would affect the performance. A water leak in a cold cap or trap would hinder performance. Both of these issues would cause the pressure to beRead more
If the jet assembly (array) is not properly assembled (or seated) it would allow larger gaps or openings for the flow of oil vapor than designed for. This would affect the performance. A water leak in a cold cap or trap would hinder performance. Both of these issues would cause the pressure to be higher than expected.
See lessWhat causes diffusion pumps to overheat?
There is a temperature limit switch on the pump. This could be faulty. Possibly low oil level and/or insufficient water flow. The water cooling tubing is a long and tortuous path and poor water quality could cause these lines to partially clog. Mineral deposits and dirt in the lines.
There is a temperature limit switch on the pump. This could be faulty. Possibly low oil level and/or insufficient water flow. The water cooling tubing is a long and tortuous path and poor water quality could cause these lines to partially clog. Mineral deposits and dirt in the lines.
See lessWhat causes diffusion pump oil to breakdown?
Typically temperature, time and contamination
Typically temperature, time and contamination
See lessWhat is a 35-inch Varian diffusion pump?
I believe that is the largest diameter oil diffusion pump Varian (manufacturer) ever made. Very good pump! See this old file 05_Diffusion_Pumps
I believe that is the largest diameter oil diffusion pump Varian (manufacturer) ever made. Very good pump! See this old file 05_Diffusion_Pumps
See lessWhat is the pumping capacity of an oil diffusion vacuum pump?
Pumping capacity varies depending upon the size (diameter) of the pump and the gasses you are pumping. The manufacturers usually rate them according to their ability to pump air and helium and hydrogen. See this old Varian file for additional information on diffusion pumps. 05_Diffusion_Pumps
Pumping capacity varies depending upon the size (diameter) of the pump and the gasses you are pumping. The manufacturers usually rate them according to their ability to pump air and helium and hydrogen. See this old Varian file for additional information on diffusion pumps. 05_Diffusion_Pumps
See lessWhat is the importance of a trap in a diffusion pump?
The trap typically serves as a water vapor pump. The typical trap is cooled by liquid nitrogen or some refrigeration system. Trapping water vapor by condensation allows the diffusion pump to pump the real gasses in the system rather than water vapor. This reduces the pumping time required to reachRead more
The trap typically serves as a water vapor pump. The typical trap is cooled by liquid nitrogen or some refrigeration system. Trapping water vapor by condensation allows the diffusion pump to pump the real gasses in the system rather than water vapor. This reduces the pumping time required to reach the ultimate pressure.
See lessWhat is the purpose of the oil diffusion pump in a vacuum system?
The purpose of the oil diffusion pump is to provide a lower pressure (higher vacuum) in the system being evacuated.
The purpose of the oil diffusion pump is to provide a lower pressure (higher vacuum) in the system being evacuated.
See lessDo all diffusion pumps have heaters?
I believe all true diffusion pumps have heaters.
I believe all true diffusion pumps have heaters.
See less