With the continuous improvement of automation in China, the amount of sensors is increasing. The development of high-tech displacement sensor products has broad prospects. LVDT displacement sensor has the characteristics of high precision, good dynamic characteristics, reliable operation and convenient use, which has been favored by consumers. What about the application of LVDT displacement sensor in industrial automation? The following is the sharing of Shensi measurement and control editor:

1. Remote positioning feedback

The energy and petroleum industries often need to obtain the positioning feedback information of remote locations. Long distance signal transmission usually uses current transmitter instead of voltage signal transmission. The voltage signal is easily affected by “voltage drop” and other external factors. LVDT displacement sensor can provide 4 to 20mA signal proportional to the sensor position, which is usually the standard in the process control industry. The position transmitter adopts two-wire loop power supply. In other words, the two-wire loop can not only provide the position signal, but also supply power to the sensor, eliminating the trouble of additional power supply for the remote sensor. Because of the application of weak current, LVDT displacement sensor has high safety and is suitable for hazardous applications.

2. Drum spacing

When rolling steel, aluminum or paper, the drum spacing must be measured in order to control the thickness of the material. The main body of LVDT displacement sensor is usually installed on the fixed drum, and the magnetic core is installed on the moving drum. With the change of drum spacing, LVDT sensor outputs analog voltage or current signal as position signal feedback. LVDT is a rugged industrial sensor, which can withstand high temperature and vibration in dusty environment.

3. Ball valve positioning

LVDT displacement sensor is suitable for sensing the position of ball valve and actuator. It has long service life and high reliability. The Commission is a better solution than potentiometer and resistance element.

4. Injection molding machine

The injection molding machine adopts pressure sensor and LVDT to control and measure the hydraulic pressure and air pressure of the actuator used to open and close the mold and control the feeding. LVDT displacement sensor is especially suitable for applications requiring high accuracy, repeatable overload protection, zero position and range error. This kind of sensor does not need to be adjusted during production, and is easy to install and maintain. It reduces the installation cost and has good performance. In addition, due to the small size of the product and the use of stainless steel shell, the cleaning work after material overflow is simplified.

5. Long stroke cylinder displacement

LVDT displacement sensor can withstand the high pressure on the probe and is very suitable for industrial pneumatic cylinder. The maximum working pressure of this product is 5000PSI, the frequency response is 100Hz, and the precision is as high as 0.05%. It is undoubtedly an ideal choice for closed-loop positioning control of three-dimensional automatic mounting mechanism. The information output according to the standard speed is fed back to the proportional control system, so as to improve the material processing efficiency.

6. Single ended / battery powered LVDT displacement sensor

More and more programmable controllers and data acquisition systems require unipolar input, which promotes the development of SCA series LVDT. SCAF and SCAH use a DC voltage of 8.5 to 28 volts and can produce a DC output of 0 to 5 volts or 0 to 10 volts. The specific situation depends on the connected line. Because the built-in circuit of Se only needs 6mA current. Therefore, this series of products has become an ideal choice for portable and remote battery powered applications.

7. Valve positioning

LVDT displacement sensor can not only withstand the high temperature of gas turbine and steam turbine, but also has small volume and can be installed inside the actuator, so it is especially suitable for controlling the positioning of valves. The main body of LVDT displacement sensor is installed on the valve, and the magnetic core is installed on the opening and closing parts. Then, the LVDT displacement sensor will feed back an accurate analog signal to the control system, which is proportional to the opening and closing degree of the valve. It can be used in the measurement range of ± 10.005 to ± 10.005 inches of LVDT.

8. Pneumatic linear sliding positioning feedback

Many mounting machines need positioning confirmation. Endpoint sensors and linear potentiometers are commonly used to provide such positioning. There is a defect in using endpoint sensors, that is, the repeatability of zero position will gradually decrease. In addition, the endpoint sensor cannot provide intermediate data between the fully extended and fully retracted positions. The initial use effect of the linear potentiometer is OK, but the accuracy of the contact vernier and conductive film it uses will decline after being used for a period of time. This problem will be particularly prominent when using potentiometers in applications with partial jitter action in the journey. LVDT displacement sensor can provide short stroke positioning feedback for pneumatic linear positioning equipment, providing a low-cost, non-contact solution.

Shenzhen Shensi measurement and Control Technology Co., Ltd. is a high-tech enterprise specializing in the R & D, design, manufacturing and sales of sensor technology. The company’s main products are LVDT displacement sensor, eddy current displacement sensor, non-contact displacement sensor, contact displacement sensor, pull rope displacement sensor, linear displacement sensor, high-precision displacement sensor, differential displacement sensor, resistive displacement sensor, magnetostrictive liquid level sensor, capacitive liquid level sensor, inductive probe, etc. The products are widely used in machinery manufacturing, automobile, metallurgy, petroleum, chemical industry, scientific research institutes, aerospace, transportation and construction and other fields.

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