I. How to select a pressure sensor connector
Single-ferrule terminal connectors are not widely used in the market. Most manufacturers use double-ferrule terminal connectors, which are priced between 9 and 18 yuan, depending on the model. Both single and double-ferrule terminal connectors use steel ferrule fittings and feature reliable connections, high pressure resistance, good sealing and repeatability, convenient installation and maintenance, and safe and reliable operation.
A pressure transmitter double ferrule terminal connector typically consists of a top protective cap with 4-point thread, a lower 20*1.5 threaded section, a PTFE gasket, a screw cap, and a welded tube. The performance of a ferrule connector depends not only on the materials, manufacturing precision, and heat treatment of the components, but also significantly on the quality of assembly. Therefore, assembly should be performed as follows.
1. Cut the pipe to the required length on a special machine tool, or cut it by hand. The perpendicularity of the cut surface to the center line of the pipe shall not exceed half of the outer tolerance of the pipe.
2. Remove burrs, metal shavings, and dirt from the inner and outer circumference of the pipe ends.
3. Remove the anti-rust oil and dirt from all parts of the pipe joint.
4. Place the ferrule onto the tube in sequence, then insert the tube into the bottom of the conical hole in the connector body, and position the ferrule correctly. While tightening the nut, rotate the tube until it stops, then tighten the nut 1 to 1 1/3 turns.
The above explains how to select pressure sensor connectors. Now you should have a better understanding. You can refer to the above introduction when selecting pressure sensor connectors in the future. With the continuous development of technology, there are more and more types of pressure sensors, so you must be careful when making your selection.
II. Sources of Interference from Pressure Sensors
Pressure sensors are frequently used in various environments. Sometimes we find that pressure sensors are inaccurate in measurement or the signal output is unstable. This is generally due to interference from sources of interference. The main sources of interference for pressure sensors include the following.
There aren't many sources of interference for pressure sensors. First, there's radio frequency interference, mainly from the starting and stopping of large power equipment and high-order harmonic interference, such as interference from thyristor rectifier systems. Second, there's electrostatic induction, caused by parasitic capacitance between two branches or components, allowing charge to transfer from one branch to the other—also known as capacitive coupling. Third, there's leakage current induction. Poor insulation in components, terminals, printed circuit boards, capacitor dielectrics, or casings within electronic circuits, especially in high-humidity environments, reduces insulation resistance, leading to increased leakage current and interference. This is particularly severe when leakage current flows into the input stage of the measurement circuit. Electromagnetic induction occurs when mutual inductance exists between two circuits; changes in current in one circuit are coupled to the other through a magnetic field. Examples include leakage flux in transformers and coils, and level-carrying conductors. Finally, there may be other interferences. Besides the above, on-site safety monitoring systems are susceptible to mechanical, thermal, and chemical interference due to harsh operating environments.
Understanding the sources of interference in pressure sensors is very helpful. When using a pressure sensor, if we find that the signal output is inaccurate or interfered with, we can eliminate the interference from the above aspects, which will help us find the source of interference more quickly and ensure the normal progress of the project.
