The application of displacement sensor in industrial control automation
With the continuous improvement of the level of automation technology in our country, the use of sensors is increasing, and the development and design of high-tech displacement sensor products have broad market prospects. The displacement sensor has the characteristics of high precision, good dynamic characteristics, reliable operation, easy to use, etc., and is welcomed by users. So, how about the application of displacement sensors in industrial control automation?
1, remote positioning feedback
The energy and petroleum industries often need to obtain positioning feedback for remote locations. Long-distance transmission of signals usually uses a current transmitter rather than a voltage signal. Voltage signals are susceptible to voltage drops and other external factors. Displacement sensors can provide a 4-20mA signal proportional to the sensor position and are often the standard in the process control industry. The position transmitter uses a two-wire loop power supply, that is, the two-wire loop can also power the sensor while providing the position signal, saving the trouble of additional power supply for the remote sensor. Due to the application of low current, the displacement sensor has a high safety and is suitable for hazardous applications.
2. Distance between rollers
When rolling steel, aluminum or paper, the drum spacing must be measured in order to control the thickness of the material. The body of the displacement sensor is usually installed on a fixed drum, and the magnetic core is installed on the drum. As the drum spacing changes, the sensor outputs an analog voltage or current signal as a position signal feedback. It is a rugged industrial sensor that can withstand high temperatures and vibrations in dusty environments.
3, ball valve positioning
Displacement sensors are suitable for sensing the position of ball valves and actuators, providing a long service life, high reliability and a better solution than using potentiometers and resistance components.
4, injection molding machine
The injection molding machine uses pressure sensors to control and measure the hydraulic pressure and air pressure of the actuators for opening and closing molds and controlling feeding. Displacement sensors are particularly suitable for applications where accuracy, repeatable overload protection, zero position and range errors are required. This sensor does not need to be adjusted in the production process, easy installation and maintenance, reduces the installation cost, and has good performance. In addition, due to the small size of the product and the use of stainless steel housing, cleaning operations after material spills are easy.
5, the displacement of long stroke cylinder
The displacement sensor can withstand the high pressure on the probe and is ideal for industrial cylinders. The maximum working pressure is 5000psi, the frequency response is 100Hz, and the precision is up to 0.05%, which is the ideal choice for closed-loop positioning control of 3D automatic mounting mechanism. The information output at the standard speed is fed back to the proportional control system to improve the efficiency of material handling.
6, valve positioning
The displacement sensor can not only withstand the high temperature of gas turbines and steam turbines, but also has a small size and can be installed inside the actuator, so it is particularly suitable for the positioning of the control valve. The main body of the displacement sensor is installed on the valve, and the magnetic core is installed on the switch component. Moreover, the displacement sensor feeds back the correct analog signal to the control system, which is proportional to the degree of the valve switching. The measured lengths range from ±0.005 to ±10 inches and can be used for control loops, particularly for this application.
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