1. For general corrosive media, if the stainless steel elastic element can withstand 1 to 2 years of corrosion, a general stainless steel pressure gauge can be selected. When installing, the pressure guiding tube should be short. If necessary, the buffer coil should be replaced with a buffer tank to prevent impurities. Clogged.
2. If the medium intentionally corrodes stainless steel and copper, the buffer tank can be replaced with an isolation tank, and a corrosion-resistant isolation liquid can be added. The type of barrier liquid can be selected according to the nature of the tested medium, but it is better to use it for more than half a year without deterioration. 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 must be small, and the fluorinated oil must be recovered and reused during disassembly.
3. Diaphragm pressure gauges can be used. At present, there are molybdenum-containing stainless steel, Hastelloy and tantalum. The pressure between the diaphragm and the ballistic tube is transmitted by methyl silicone oil. The small range can be 0 ～ 100kPa. If it is not resistant, you can add a layer of F46 (polyperfluoroethylene propylene) diaphragm, but the sensitivity of the instrument is reduced. F46 can also be used directly as the isolation diaphragm, but pay attention to the permeability of the medium. For high temperature and oil-free medium transfer liquid, fluoro oil can be used.
