Anti-corrosion method of pressure gauge
1. For general corrosive media, if the stainless steel spring tube can withstand corrosion for 1 to 2 years, it can be selected as an ammonia pressure gauge. When installing, the pressure guiding tube should be short, and the buffer coil should be replaced with a buffer tank to prevent impurities from clogging.
2. If the medium is intended to corrode stainless steel and copper, the buffer tank can be changed to an isolation tank, and corrosion-resistant isolation fluid can be added. The type of barrier liquid can be selected according to the nature of the tested medium, but it is better to not deteriorate after using it for more than half a year. If ordinary isolation fluid is not applicable, fluorochloro oil can be used as isolation fluid, but the price is very expensive, so the isolation tank should be made small, and the fluorine oil should be recycled for reuse during disassembly and assembly. Imported pump
3. Diaphragm pressure gauges can be used. At present, there are molybdenum 2 titanium and tantalum sheets. The pressure is transmitted between the diaphragm and the ballistic tube with methyl silicone oil. The minimum range can be 0-100kPa. If the diaphragm material is not corrosion resistant, A layer of F46 (polyfluoroethylene propylene) diaphragm can be added, but the sensitivity of the meter is reduced. F46 can also be used as the isolation diaphragm directly, but pay attention to the permeability of the medium. Fluorine oil can be used for the transfer fluid, which can play a double isolation role.
