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Pressure transmitter selection criteria
First, the wetted material
   We have to consider that the pressure transmitter medium measured, the contact portion of the dielectric material generally used in the pressure transmitter 316 stainless steel, if you are not corrosive media of 316 stainless steel, the pressure becomes substantially all of the The transmitter is suitable for measuring the pressure of the medium .
   If you have a corrosive medium 316 stainless steel, then we will use chemical seal, so that not only functions as a pressure medium can be measured, can be effectively prevented from contacting the wetted part of the pressure transmitter medium, and thus play a Protect the pressure transmitter and extend the life of the pressure transmitter .
Second, the accuracy level
   Each type of electronic measuring instrument will have accuracy error , but the accuracy level of each country is different . For example , the accuracy of the national standard such as China and the United States is the good part of the linearity of the sensor , that is, we usually The accuracy of the measurement range is between 10% and 90% ; and the accuracy of the European standard is the bad part of the linearity , which is what we usually call 0 to 10% and 90% to 100% of the measurement . The accuracy between the two . If the accuracy of the European standard is 1%, the accuracy of the standard in China is 0.5% . The accuracy of the pressure transmitter developed by Shanghai Yongwei Automatic Control Equipment Co., Ltd. is 0.2 .
Third, the range of the range
   General sensor measures a wide range of zui sensor full scale 70% zui good, which is now to measure the pressure of 70bar, we selected pressure transmitter range should be selected 100bar.
Fourth, the output signal
At present, due to various collection needs , there are many kinds of output signals of pressure transmitters on the market , mainly 4~20mA, 0~20mA, 0~10V, 0~5V, etc. , but the more commonly used is 4~20mA and 0~10V two kinds . Among the output signals I mentioned above , only 4~20mA is two-wire system (we say that the output is several lines without grounding or shielding) , and the others are three-wire system .
Fifth, the medium temperature
   Since the signal of the pressure transmitter is partially converted by the electronic circuit , in general , the temperature of the pressure transmitter is -30 to +100 degrees . If the temperature is too high , we generally use a condensation bend to cool. The medium , so the cost of producing a high temperature resistant pressure transmitter for the manufacturer will be much lower .
Sixth, measuring medium
   Generally, we measure relatively clean fluids . We can use standard pressure transmitters directly . If the medium you are measuring is crystallized or viscous , we usually use external diaphragms. Or use with chemical seals , this will effectively prevent the medium from blocking the pressure measurement hole .
Seven, other
After confirming the above five parameters, we must also confirm the process connection interface of your pressure transmitter and the supply voltage of the pressure transmitter ; if it is used in special occasions, consider the explosion protection and protection level .
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