A very important point in the maintenance of pressure gauges is the corrosion of the pressure gauge. To prevent corrosion of the pressure gauge, pay attention to the following points: 1. If the medium is corrosive to stainless steel and copper, the buffer tank can be replaced with an isolation tank, and corrosion-resistant Isolation fluid. The type of isolation fluid 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 isolating fluid can not be used in the maintenance of the pressure gauge, a very important point is the anti-corrosion of the pressure gauge. To prevent the anti-corrosion of the pressure gauge, pay attention to the following points: 1. If the medium is corrosive to stainless steel and copper, the buffer tank can be replaced with isolation Tank, add corrosion-resistant spacer fluid. The type of isolation fluid 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 fluids are not applicable, fluorochloro oil can be used as the 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. 2. Diaphragm pressure gauges can be used. At present, there are molybdenum 2 titanium and tantalum sheets, and methyl silicone oil is used to transmit pressure between the diaphragm and the spring tube. 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. 3. For general corrosive media, if the stainless steel spring tube can withstand corrosion for 1 to 2 years, it can be used as a pressure gauge for ammonia. 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.
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