Product Category
Dewar detection mode
Date: Jul 23, 2020
The tightness of the Dewar is particularly important. Any leakage may result in the loss of gas. If it carries natural gas or flammable gas, it is likely to cause an explosion hazard, so it is very necessary for the leak detection of the Dewar.
There are generally two modes for Dewar detection, vacuum mode and positive pressure mode. Dewars mostly use the negative pressure mode and vacuum mode of the helium mass spectrometer leak detector to detect leaks. The helium mass spectrometer leak detector is connected to the vacuum system. Since the HLT550 does not have a foreline pump, the vacuum system used on site can be used as The fore pump of the helium mass spectrometer leak detector is best connected near the air inlet (that is, the air inlet of the vacuum pump set). The vacuum system will have a pump set to vacuum, so connect the inspection at the air inlet of the pump. The leak detector is in the movement direction of the airflow, and it is easy to have a part of the partial pressure distributed to the leak detector, so as to achieve the effect of leak detection.
Dewar tanks are mainly designed to store, transport and use liquid oxygen, liquid nitrogen, liquid argon or carbon dioxide. Therefore, its gas supply system is a very important link for the entire device. So what checks should Jianshen tank do before they are used? Let's build a gentry jar to explain in detail:
1. The oxygen system of the Dewar tank must be free of grease and leakage.
2. We need to connect the two Dewar gas interface fixtures tightly for use.
3. Before applying the Dewar tank, be sure to check all the valves, pressure gauges, safety valves, valve fixtures for the Dewar tank, etc. should be complete and easy to use.
4. Special attention should be paid to the fact that if the gas supply system of the Dewar tank is used for the first time or is re-used after maintenance, we should open the valves of the bus bar and the gas terminal valve or the gas cutting gun nozzle, and replace the system with qualified oxygen . It should also be noted that after purging for five minutes, close all valves for use.
There are generally two modes for Dewar detection, vacuum mode and positive pressure mode. Dewars mostly use the negative pressure mode and vacuum mode of the helium mass spectrometer leak detector to detect leaks. The helium mass spectrometer leak detector is connected to the vacuum system. Since the HLT550 does not have a foreline pump, the vacuum system used on site can be used as The fore pump of the helium mass spectrometer leak detector is best connected near the air inlet (that is, the air inlet of the vacuum pump set). The vacuum system will have a pump set to vacuum, so connect the inspection at the air inlet of the pump. The leak detector is in the movement direction of the airflow, and it is easy to have a part of the partial pressure distributed to the leak detector, so as to achieve the effect of leak detection.
1. The oxygen system of the Dewar tank must be free of grease and leakage.
2. We need to connect the two Dewar gas interface fixtures tightly for use.
3. Before applying the Dewar tank, be sure to check all the valves, pressure gauges, safety valves, valve fixtures for the Dewar tank, etc. should be complete and easy to use.
4. Special attention should be paid to the fact that if the gas supply system of the Dewar tank is used for the first time or is re-used after maintenance, we should open the valves of the bus bar and the gas terminal valve or the gas cutting gun nozzle, and replace the system with qualified oxygen . It should also be noted that after purging for five minutes, close all valves for use.
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