The pressure gauge uses the elastic deformation of the sensitive elements (Bourdon tube, Capsule, Bellows) in the watch, and the pressure deformation is transmitted to the pointer by the conversion mechanism of the movement in the watch, causing the pointer rotation to display the pressure.
Capsule pressure gauge: The sensitive element of the capsule is composed of two connected diaphragms with circular waves. The structure of the capsule pressure gauge is mainly composed of capsule, transmission mechanism, adjustment mechanism, pointer, dial and so on.
There are two kinds of diaphragm type pressure gauge: diaphragm pressure gauge and capsule pressure gauge. The former is mainly used to measure the pressure of corrosive media or non-solidified and non-crystalline viscous media; the latter is often used to measure gas micro pressure and negative pressure, and it is suitable for measuring micro pressure and vacuum. The measuring range is generally -2000～4000Pa, and the accuracy grade is generally 2.5.
Pressure gauges can be divided into precision pressure gauges and general pressure gauges according to their measurement accuracy.
The measurement accuracy grades of precision pressure gauge are 0.1, 0.16, 0.25, and 0.4 respectively;
The measurement accuracy grades of general pressure gauges are 1.0, 1.6, 2.5, and 4.0 respectively;
Measuring range: pressure vacuum gauge, micro pressure gauge, low pressure gauge, medium pressure gauge and high pressure gauge;
Applicable conditions: shock-resistant, heat-resistant, corrosion-resistant, and safe;
According to the interface position: divided into radial and axial;
The position of the threaded interface of the pressure gauge is radial under the dial and axially perpendicular to the dial.
The oxygen pressure gauge and the ordinary pressure gauge can be exactly the same in terms of structure and material, but the oxygen pressure gauge must be oil-free, because oil enters the oxygen system and can easily cause an explosion.
Electric contact pressure gauge: The upper and lower limit contact mechanism is installed, and an alarm signal is issued when the pressure deviates from a given range.