The unit of differential pressure read by the U-tube manometer
The unit of pressure difference read by the U-tube manometer is mmH20 (mm water column)
The pressure difference is the difference between two forces acting vertically on the surface of the object, the unit is "N" and the symbol is "F"; the pressure difference is the difference between the two pressures on the object per unit area, the unit is "Pa" symbol is "P". Pressure is derived from pressure and is a physical quantity used to describe the effect of pressure. The relationship between them is p=F/S.
Structural principle
The U-shaped single-tube liquid pressure gauge is composed of a measuring system, an indicating system, a magnetic-assisted electric contact device, a casing, an adjusting device, and a junction box (plug seat).
The working principle of the U-shaped single-tube liquid pressure gauge is based on the fact that the spring tube in the measurement system is under the pressure of the measured medium, and the end of the spring tube produces a corresponding elastic deformation-displacement. Pre-amplification, the measured value is indicated on the dial by the indication on the fixed gear (together with the contact).
