With the development of society, many industries are gradually adopting electronic pressure gauges, which are commonly known as pressure transmitters. However, due to factors such as working environment, medium, and medium temperature, we must consider six major factors when selecting a pressure transmitter.

Firstly, the liquid receiving material

Our first consideration is the medium measured by the pressure transmitter. Generally, the material used for the contact medium of the pressure transmitter is 316 stainless steel. If your medium is not corrosive to 316 stainless steel, then basically all pressure transmitters are suitable for measuring medium pressure.

If your medium is corrosive to 316 stainless steel, then we need to use chemical sealing. This not only measures the pressure of the medium, but also effectively prevents contact between the medium and the liquid receiving part of the pressure transmitter, thereby protecting the pressure transmitter and extending its lifespan.

Secondly, accuracy level

Every electronic measuring instrument will have accuracy errors, but due to the different accuracy levels marked by different countries, such as China and the United States, the accuracy of national standards is the best part of sensor linearity, which is usually referred to as the accuracy between 10% and 90% of the measurement range; The accuracy of the European standard is the worst part of linearity, which is commonly referred to as the measurement accuracy between 0 and 10% and 90% to 99.99%. If the accuracy of the European standard is 1%, then the accuracy of the Chinese standard is 0.5%.

Thirdly, the range of measurement

The maximum range measured by a typical sensor is 70% of the sensor's full range, which is the best. Therefore, if we want to measure a pressure of 70 bar now, we should choose a range of 100 bar for the pressure transmitter.

Fourth, output signal

At present, due to various collection needs, there are many types of output signals for pressure transmitters on the market, mainly 4-20mA, 0-20mA, 0-10V, 0-5V, etc. However, the more commonly used are 4-20mA and 0-10V. Among the output signals I mentioned above, only 4-20mA is a two wire system (the output we mentioned is a few wire system without grounding or shielding wire), while the others are all three wire systems.

Fifth, medium temperature

Due to the fact that the signal of the pressure transmitter is partially converted through electronic circuits, in general, the measurement medium temperature of the pressure transmitter is -30 to+100 degrees. If the temperature is too high, we usually use a condensation bend to cool the medium. This relatively reduces the cost of manufacturers producing a high-temperature resistant pressure transmitter for you.

Sixth, measure the medium

Generally, we measure relatively clean fluids, so we simply use standard pressure transmitters. If the medium you are measuring is easy to crystallize or viscous, we usually use an external diaphragm or use it in conjunction with a chemical seal to effectively prevent the medium from blocking the pressure measurement hole.

After determining the six parameters above, we also need to confirm the process connection of your pressure transmitter