1. Wetted material
Generally considered is the medium measured by the pressure transmitter. The material of the contact medium part of the general pressure transmitter is 316 stainless steel. If the medium is not corrosive to 316 stainless steel, basically all pressure transmitters are Suitable for medium pressure measurement. If the medium is corrosive to 316 stainless steel, a chemical seal must be used. This will not only measure the pressure of the medium, but also effectively prevent the medium from contacting the wetted part of the pressure transmitter, thereby protecting the pressure transmission. Device to extend the life of the pressure transmitter.
2. Measurement medium
Generally, a relatively clean fluid is measured, and a standard pressure transmitter can be directly used. If the medium to be measured is easily crystallized or viscous, an external diaphragm or a chemical seal is commonly used. Use so that the effective tissue medium will block the pressure measurement hole.
3. Output signal
At present, due to various acquisition needs, there are many output signals of pressure transmitters on the market, mainly 4-20mA, 0-20mA, 0-10V, 0-5V, etc., but the more commonly used are 4-20mA and There are two types of 0-10V. Among these output signals mentioned above, only 4-20mA is a two-wire system, and the others are three-wire systems.
Generally, the maximum range measured by a sensor is 70% of the full scale of the sensor. It is best to measure 70 bar pressure.
5. Medium temperature
Because the signal of the pressure transmitter is partially converted by the electronic circuit, in general, the temperature of the measuring medium of the pressure transmitter is -30 to +100 degrees. If the temperature is too high, the condensation bend is generally used to cool the medium.