Isolation diaphragm

Membrane for protecting the medium

Keywords: isolation diaphragm, pressure transmitter protective diaphragm, pressure gauge protective diaphragm

Application field

Due to the special nature of chemical materials, in working environments with strong corrosive media, the parts of measuring instruments that come into contact with the media are easily corroded, resulting in damage to the measuring instruments. In addition, when the viscosity of the measured medium is high, the surface of the metal film box of the measuring instrument is prone to adhesion and blockage, which reduces the measurement accuracy. Some media have high viscosity and strong adhesion, which can easily cause instrument failure or scrapping during cleaning.

To overcome the above shortcomings, an isolation membrane has been produced to meet the requirements of chemical enterprises and at a low price. The membrane is installed on ordinary measuring instruments, which effectively solves the problems of corrosion and blockage of the instrument while ensuring the accuracy and sensitivity of the original instrument, and extends the service life of the instrument. During each maintenance, only a new isolation membrane needs to be replaced, greatly reducing the maintenance workload. After using the isolation membrane, the special material of the original metal membrane box (such as Hastelloy, Monel, Tantalum, and even Platinum) can be changed to ordinary 316 material, greatly saving investment.

Product Features

Especially suitable for working environments with strong corrosiveness and high viscosity of the medium, with a long-term usage temperature of -80~260 ℃.

The main component of the isolation membrane is perfluoroalkoxy resin PFA (also known as soluble polytetrafluoroethylene). PFA material has significantly better strength and stress cracking resistance at high temperatures than PTFE and FEP, and has better flexibility and more sensitive sensing.

Compared with traditional PTFE spraying technology, it requires professional manufacturers to spray, which is time-consuming, expensive, and difficult to achieve in terms of quality; The sensitivity of the sprayed film decreases; In addition, it is easy to damage the spray coating during disassembly and assembly, which may damage the entire instrument; PFA isolation membrane ensures that sensitivity is not affected in any way and installation is extremely convenient.