Vacuum oil filter used in high altitude area
Most of the places where human activities are located are in low altitude areas, because the high altitude places have thin air, low oxygen content, and strong solar ultraviolet radiation. Therefore, most people are willing to live in low seas. So what is the difference in production and life in high altitude areas, for ordinary people, such as Tibet, humans are gradually adapting.
So does high altitude affect the use of vacuum oil filters? Actually not. The vacuum oil filter mainly removes the moisture, gas and impurities in the oil by physical methods. Some customers use vacuum oil filters in high altitude areas and find that the vacuum of the oil filter is relatively low. Why is this? Because the vacuum meter on the vacuum oil filter is a mechanical meter, generally only shows the relative vacuum. Due to the low air pressure in the high sea area, compared to the vacuum inside the vacuum oil filter, the table shows that the vacuum is lower than in places with low altitude.
In high altitude areas, the relative vacuum for dehydration and degassing is relatively low, and the actual dehydration and degassing effect is unchanged. Therefore, the altitude has little effect on the efficiency of the vacuum oil filter. Here you can learn about relative vacuum and absolute vacuum.
Conversion of relative vacuum and absolute vacuum
The "vacuity" commonly used in the international vacuum industry is also the most scientific one. It is labeled with absolute pressure; it refers to "limit vacuum, absolute vacuum (absolute vacuum is actually an ideal vacuum state, in fact, absolute vacuum does not exist). , Absolute pressure ";
However, the "relative vacuum" (relative pressure, vacuum gauge pressure, and negative pressure) is also widely used because the measurement method is simple, measuring instruments are very common, easy to buy, and cheap. In theory, the two can be converted to each other. The conversion method of the two is as follows:
Relative vacuum = absolute vacuum (absolute pressure)-air pressure at the measurement site
A standard atmospheric pressure 1atm = 101325Pa = 101.325kPa = 0.101325MPa≈0.1MPa single coil spring tube pressure gauge (such as Y-100) measures relative pressure, the pointer changes clockwise, and the starting point 0 indicates an atmospheric pressure of 0.1MPa, such as The indication is 1 MPa, which means that it is 1 MPa higher than atmospheric pressure, and the absolute pressure should be 1.1 MPa.
A single-turn spring tube vacuum gauge (such as Z-100) measures relative pressure. The pointer changes counterclockwise. The starting point 0 indicates an atmospheric pressure of 0.1 MPa. If the indicator is Px (it should be negative), the absolute pressure P = Px + 0.1MPa.
For example, the indication is Px = -0.02MPa = -20kPa, and the absolute pressure P = Px + 0.1MPa = 80 kPa. The indicated number is Px = －0.04MPa = －40kPa, and absolute pressure P = Px + 0.1MPa = 60 kPa. The indicated number is Px = －0.06MPa = －60kPa, and the absolute pressure P = Px + 0.1MPa = 40 kPa.