Pressure transmitter selects six factors that must be considered - News - Global IC Trade Starts Here.

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In the development of society, many industries are gradually adopting electronic pressure gauges, which are what we usually call pressure transmitters. However, due to the working environment, medium, medium temperature, etc., we must consider six factors when choosing a pressure transmitter.

First, the wetted material

The first thing we should consider is the medium measured by the pressure transmitter. The material of the contact medium of the general pressure transmitter is made of 316 stainless steel. If your medium is not corrosive to 316 stainless steel, then basically all the pressure. The transmitter is suitable for your measurement of the pressure of the medium.

If your medium is corrosive to 316 stainless steel, then we need to use a chemical seal, which not only can measure the pressure of the medium, but also effectively prevent the medium from contacting the wetted part of the pressure transmitter. 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 national standards such as China and the United States is the best part of the linearity of the sensor, that is, we usually The accuracy of the measurement range is between 10% and 90%; the accuracy of the European standard is the worst part of the linearity, which is what we usually call the 0 to 10% and 90% to 100% of the measurement inverse. The precision between. If the accuracy of the European standard is 1%, the accuracy of the standard in China is 0.5%.

Third, the range of the range

The maximum range of measurement for a typical sensor is 70% of the full scale of the sensor. That is, the pressure of 70 bar is now measured. The range of the pressure transmitter we choose should be 100 bar.

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 do not contain ground or shielded wire), the other 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 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 a chemical seal, this will effectively prevent the medium from blocking the pressure measuring hole.

After we have determined the above six parameters, we also need to 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 pressure transmitter explosion protection and protection. grade.