How to read and convert U-shaped pressure gauge
According to the principle of hydrostatics, the static pressure generated by a certain height of liquid column is used to balance the measured pressure to measure positive pressure, differential pressure and negative pressure, as well as the degree of vacuum.
It is simple in structure, sturdy and durable, low in price, long in service life and can be used almost permanently if there is no external force damage, easy to read, reliable in data, and does not require external power nor consume any energy. Therefore, it has been widely used in various scientific research processes in industrial production. application.
When water is used as the medium, the general measurement range is between - 9.8kPa - +9.8kPa, which is very suitable for the measurement of low pressure and micro pressure of gas medium.
How to calculate negative pressure value:
When using a U-tube manometer to measure the negative pressure, the liquid column on the side below the atmospheric pressure will be higher than the liquid column on the other side. After the liquid columns on both sides are stable, read the difference between the two liquid columns.
The pressure can be calculated by the following formula: P=hρg. In the formula: P is the pressure value, h is the liquid level difference on both sides, ρ is the density of the working fluid (commonly used: water, mercury or sprinkler, etc.), g is the local acceleration of gravity.
