Working Principle and Applications of the Capacitive Pressure Sensor

The capacitive differential pressure sensor is a conversion device that uses various types of capacitors as sensing elements to convert measured physical or mechanical quantities into changes in capacitance. It is a capacitor with variable parameters. In applications using capacitive technology, the sensitivity of a capacitive proximity switch depends on the material properties of the target object. The material properties of metal, plastic, or liquid objects will affect the sensing range.

The advantages of pressure transmitter sensors are mainly the following.

1. Good temperature stability. The capacitance value of the metal capacitive differential pressure sensor is usually independent of the electrode material, which facilitates the selection of materials with low-temperature systems and has little effect on stability since it generates very little heat. The inductive sensors have copper losses, magnetic flux, eddy current losses, etc., and are prone to zero drift after generating heat.

2. Simple construction. Dp pressure sensors are simple in structure, easy to manufacture, and easy to ensure high accuracy. The dpt sensor can be made very small to achieve some special measurements. For example, they can operate in harsh environments such as high temperatures and strong magnetic fields and can withstand high pressures and high shock overload conditions. It can not only measure the low differential pressure but also the magnetic work.

3. Good dynamic response. Since the electrostatic gravitational force between plates with electrodes is small (about 105N), the capacitance pressure sensors require very little energy. And because their moving parts can be made very small and thin, they are lightweight. Capacitance differential pressure sensors are particularly suitable for dynamic measurements because of their high natural frequency, short dynamic response time, and their ability to operate at frequencies of several megahertz. Because of its low dielectric loss, it can be powered by higher frequencies, so the system has a high operating frequency.

Auto is a leading company dedicated to manufacturing and selling of diff pressure sensors and various instruments. Pressure sensors are one of the core products of our company, characterized by high accuracy, reliability, and durability. Whether in industrial automation, automotive manufacturing, medical devices, environmental monitoring, or aerospace, our products play an indispensable role.