Buy the pressure gauge under corrosive medium working conditions, corrosion prevention is the key place of chemical equipment, if you can't correctly choose the metal material of chemical pressure gauge, slightly careless, light damage to the equipment, heavy cause accident or even cause disaster. According to relevant statistics, most of the damage of chemical equipment is caused by corrosion, so when selecting chemical equipment, we should pay attention to the scientific nature of material selection.
So how does a pressure gauge prevent corrosion?
1. to the corrosive medium, if the stainless steel tension spring tube can withstand 1 ~ 2 years of corrosion, can be selected as ammonia pressure gauge, device, pressure guide tube to short, buffer coil to use buffer tank, to prevent impurities blocking.
2. if the medium is corrosive to stainless steel and copper, the buffer tank can be changed to a barrier tank, put into the corrosion resistant separator. The barrier fluid can be selected according to the properties of the measured medium, but it is required to be used for more than half a year without disintegration. If the ordinary spacer cannot be used, fluorochlorine oil can be used as spacer, but the price is very expensive, so the barrier tank should be made small, and the fluorochlorine oil should be recycled during disassembly.
3. can use the gap pressure gauge, now there is molybdenum 2 titanium and tantalum piece, between the diaphragm and the ballistic tube with methyl silicone oil transfer pressure, the minimum range can do 0 ~ 100kPa, if the diaphragm data is not corrosion resistant, you can add a layer of F46(polyperfluoroethylene propylene) diaphragm, but the sensitivity of the meter has decreased. F46 can also be used directly as barrier gap sheet, but pay attention to the permeability of the medium, transfer fluid can be selected fluorine oil, can play a double barrier effect.
4. on the general corrosion medium, if the stainless steel wire springs can withstand 1 ~ 2 years of corrosion, can be selected as ammonia pressure gauge, installation, pressure guide tube to short, buffer coil to use buffer tank, to prevent impurities blocking. The appearance of the movement is the heart of the pressure gauge parts, most of the appearance of damage is due to the damage of the movement of the instrument can not be used after the existing movement with the limit of the nail, solve the problem of the appearance of the jump. F46 can also be used directly as barrier gap sheet, but pay attention to the permeability of the medium, transfer fluid can be selected fluorine oil, can play a double barrier effect