When Will We Use the Diaphragm Pressure Gauge?
The diaphragm pressure gauge is composed of a diaphragm isolator and a universal pressure gauge. It is suitable for measuring the pressure of the medium with strong corrosion, high temperature, and high viscosity, it can also measure the pressure of a medium that is easy to crystallize, solidify, and has solid floats. The diaphragm pressure gauge can prevent the measuring medium from directly entering the universal pressure gauge and prevent sediment from accumulating, and it is widely used in petrochemical, soda, chemical fiber, dyeing, pharmaceutical, food, and dairy industries.
Before using or installing a diaphragm pressure gauge, we should first understand the characteristics of the monitored medium, because the diaphragm pressure gauge is designed for special media. When monitoring general gas, water, and oil pressure, a general pressure gauge can be used. When monitoring the pressure of nitric acid, phosphoric acid, strong alkali, stainless steel pressure gauge can be used.
However, when the monitored medium is highly corrosive, such as hydrochloric acid, wet chlorine gas, ferric dichloride; the medium has a high viscosity like latex; the medium is easy to crystallize like saltwater; the medium is easy to solidify like hot asphalt; the medium contains solid floating objects like sewage, at this time, the above pressure gauges are not competent. Because the stainless steel tube of the pressure gauge will be corroded by hydrochloric acid, the floating matter of asphalt and sewage will also block the pressure guiding hole of the pressure gauge, and make the pressure gauge lose its function. Since the diaphragm pressure gauge has a diaphragm, it can prevent high-viscosity, easy-to-crystallize, and easy-to-solidify media from flowing into the pressure guide hole, ensuring that the reading of the pressure gauge can normally reflect the pressure of the measured medium.
When we use the diaphragm pressure gauge, we should pay attention to several points:
1. The installation position of the diaphragm pressure gauge must correspond to the installation position in the notes in the operating instructions.
2. We should choose the appropriate interface form, diaphragm material, and gasket material according to the nature of the measured medium. When used in situations with strong mechanical vibration and medium pressure pulsation, a shock-resistant pressure gauge is required.