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How to choose pressure transmitter correctly

Author: Release date: 2015-03-03 11:00:22 Source: Shanghai Cixi View: 114
Now due to the development of society, many industries gradually adopt electronic pressure gauge, which is what we usually call pressure transmitter. But because of the working environment, medium, medium temperature and other reasons, we must consider these problems when selecting pressure transmitter. Now I will talk about the selection of pressure transmitter
?????? First of all, the wetted material
What we need to consider is the medium measured by the pressure transmitter. Generally, the material of the contact medium part of the pressure transmitter is made of 316 stainless steel. If your medium is not corrosive to 316 stainless steel, then basically all pressure transmitters are suitable for you to measure the medium pressure. If your medium is corrosive to 316 stainless steel, Then we must adopt chemical seal, which can not only measure the pressure of medium, but also effectively prevent the contact between the medium and the liquid part of pressure transmitter, so as to protect the pressure transmitter and prolong the life of the pressure transmitter
? ? ?? Second, the accuracy level
Every electronic measuring meter will have accuracy error, but because the accuracy level of each country is different, for example, the accuracy of national standards such as China and the United States is the best part of the sensor's linearity, which is the accuracy between 10% and 90% of the measurement range as we usually call it; while the accuracy of European standard is the worst part of linearity, In other words, we usually call the accuracy between 0% and 10% and 90% to 100% of the measurement inverse. If the accuracy of European standard is 1%, the accuracy of Chinese standard is 0.5%
?????? Third, range
Generally, the maximum range of sensor measurement is 70% of the full range of the sensor, that is, to measure the pressure of 70 bar, we should select the range of pressure transmitter of 100 bar
?????? Fourth, output signal
At present, due to various acquisition needs, there are many kinds of output signals of pressure transmitter on the market, mainly 4... 20mA, 0... 20mA, 0... 10V, 0... 5V, etc., but the more commonly used are 4... 20mA and 0... 10V. In the above-mentioned output signals, only 4... 20mA is two-wire system (the output we said is several wire system, not including grounding or shielding wire), All of them are made of three threads
?????? Fifth, medium temperature
Because the signal of pressure transmitter is converted through electronic circuit, the temperature of measuring medium of pressure transmitter is - 30 to + 100 ℃. If the temperature is too high, we usually use condensing bend to cool the medium. In this way, the cost of manufacturing a high temperature resistant pressure transmitter will be greatly reduced
?????? Sixth, measuring medium
Generally, we measure relatively clean fluid, we can directly use standard pressure transmitter. If the medium you measure is easy to crystallize or viscous, we usually use external diaphragm or use it together with chemical seal, which can effectively prevent the medium from blocking the pressure measuring hole
?????? Seventh, others
After determining the above five parameters, we should also confirm the process connection interface of your pressure transmitter and the power supply voltage of the pressure transmitter; if it is used in special occasions, the explosion-proof and protection level should be considered.

The above is the introduction of Shanghai Cixi on how to correctly select the pressure transmitter, I hope it can help you, if you still have related product problems, you can call the page for consultation! The company provides 24-hour service!

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