How to convert the ultimate pressure of a screw vacuum pump, which is 5 Pa, to negative pressure in MPa?
Thread Content
Hello everyone, I would like to ask how the maximum pressure value of 5 Pa indicated on the nameplate is converted into the corresponding negative pressure reading on the gauge. Thank you
1 standard atmosphere = 101325 Pa. A minus 5 Pa = 101320 Pa = -0.10132 MPa G
This post was last edited by “Love between Xiaolan and Shinichi” on March 27, 2019, at 08:28. The ultimate pressure of a screw pump is 5 Pa in absolute terms, which equals 5×10^(-6) MPa. Standard atmospheric pressure is 0.1 MPa. A negative pressure gauge is essentially a vacuum gauge. A vacuum gauge indicates the level of vacuum; it uses standard atmospheric pressure as 0 Mpa, indicating the degree to which the pressure is below atmospheric pressure. Therefore, 5 Pa is displayed on the vacuum gauge as: - (0.1 – 5×10^(-6)) Mpa
A pressure of 5 Pascals is also too low; various errors can overwhelm it
5 Pa should be the absolute pressure; gauge pressure = absolute pressure – atmospheric pressure = 5 – 101325 = -101320 Pa, which is very close to a vacuum.
Vacuum pressure: the difference between absolute pressure and atmospheric pressure. Vacuum pressure is numerically the same as vacuum degree, but a negative sign should be added in front of its value.
:Lol, that’s right – there’s no need for various types of errors; even just the error resulting from changes in atmospheric pressure is sufficient to eliminate them… The fluctuations in atmospheric pressure throughout the day are well over 5 Pa·a……
Being able to achieve a vacuum of 5 Pa is really amazing