On 2018-08-08 14:48:54
Anti corrosion of pressure gauge of pressure transmitter
Pressure transmitter is the most commonly used pressure sensor in industrial application, which is widely used in many industries such as water conservancy and hydropower, railway transportation, intelligent building, production automation, aerospace, military industry, petrochemical, oil well, power, ship, machine tool, pipeline, etc.
One of the most important points in the maintenance of pressure gauge is the anti-corrosion of pressure gauge. The following points should be paid attention to in the anti-corrosion of pressure gauge:
1. For general corrosive medium, if stainless steel spring tube can withstand corrosion for 1-2 years, it can be used as ammonia pressure gauge. During installation, the pressure pipe shall be short, and the buffer coil shall be used as buffer tank to prevent impurities from blocking.
2. If the medium corrodes stainless steel and copper, the buffer tank can be replaced by isolation tank, and the corrosion-resistant isolation liquid can be added. The type of isolation 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 the common isolation liquid can not be used, CFC oil can be used as the isolation liquid, but the price is very expensive, so the isolation tank should be small, and the fluorine oil should be recycled for reuse when disassembling.
3. Diaphragm type pressure gauge can be used. At present, there are molybdenum titanium and tantalum pieces. Methyl silicone oil is used to transmit pressure between diaphragm and spring tube. The minimum range can be 0-100kpa. If the diaphragm material is not corrosion-resistant, a layer of F46 (poly perfluoroethylene propylene) diaphragm can be added, but the sensitivity of the instrument 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 selected as the transfer fluid, which can play a double isolation role.