其实是传感器的一种，这么多年来，传感器和变送器的应用越来越广泛，随着应用领域的增多，研究开发的压力变送器分类也越来越多。 Introduction: Pressure transmitters are actually a type of sensor. Over the years, sensors and transmitters have become more and more widely used. With the increase in the number of application fields, research and development of pressure transmitters have become more and more classified. A sensor is a physical device or biological organ that can detect and sense external signals, physical conditions (such as light, heat, humidity) or chemical composition (such as smoke), and pass the detected information to other devices or organs. The pressure transmitter principle is also extended based on this principle.
分类如下 Pressure transmitters are classified as follows
1. Differential pressure transmitter: The result measured by the differential pressure transmitter is the pressure difference, that is, △ P = ρg △ h. And because the oil tank is often cylindrical, the area S of the cross-section circle is constant, then, the weight G = △ P · S = ρg △ h · S, S is not changed, and G is proportional to △ P. That is, as long as the △ P value is accurately detected, it is inversely proportional to the height △ h. When the temperature changes, although the volume of the oil expands or shrinks, the actual liquid level rises or falls, the detected pressure remains constant. If the user needs to display the actual liquid level, media temperature compensation can also be introduced to solve it. 2. Hydrostatic pressure transmitter: LY-3851HP high static pressure differential pressure transmitter is a new type of high static pressure transmitter produced by our company with the introduction of foreign advanced technology and equipment. The key raw materials, components and parts are all sourced. Since imported, the whole machine has been strictly assembled and tested. This high static pressure transmitter has the characteristics of advanced design principles, complete varieties and specifications, and easy installation and use. 3. Medium and high temperature pressure transmitter: The applicable object is to measure the ambient temperature of the site is too high or the temperature of the measuring medium is too high. The medium and high temperature pressure transmitter has a good zero temperature coefficient and sensitivity temperature coefficient. Under high temperature environment Can guarantee measurement accuracy. When ordering this type of transmitter, you must inform the temperature of the measurement medium and the ambient temperature in order to facilitate the producer to respond reasonably. 4. Absolute pressure transmitter: Absolute pressure transmitter is a pressure transmitter with vacuum as the reference zero. During use, the reference zero point of the sensor can be adjusted automatically with the change of location and area without correction. The appearance is the same as the gauge pressure transmitter. 5. Negative pressure transmitter: Negative pressure transmitter is a capacitor composed of a measuring diaphragm and electrodes on both sides of the insulating sheet. When the pressure on the two sides is inconsistent, the measurement diaphragm is displaced. The displacement is proportional to the pressure difference, so the capacitance on both sides is not the same. Through the oscillation and demodulation links, it is converted into a signal proportional to the pressure Pressure transmitter: It can provide a variety of structural materials, welding structure of remote transmission device components, and strong reliability. The low-volume design of the liquid-filled cavity reduces the influence of temperature. According to the requirements of users, 200 series of silicone oil is used at a temperature of -40 to + 149 ° C; The upper limit of the working pressure of the remote transmission device is the rated value of the remote transmission device selected by the user; the working pressure is not lower than 3.5KPa (absolute pressure). For corrosive media, choose the isolating diaphragm material. 7. Diffusion silicon pressure transmitter: high accuracy and high stability. In addition to the imported original sensor, which has been corrected by laser, the overall temperature drift and non-linearity of the whole machine in the operating temperature range are finely compensated. Therefore, the non-linearity is small and the temperature stability is good in the operating temperature range. ：环境适应能力强，316L隔离膜片，具有良好的抗腐蚀能力响应速度快，比电容式压变快几十倍零点自平衡，自带温度补偿 8. Ceramic pressure transmitter : strong environmental adaptability, 316L isolation diaphragm, good anti-corrosion ability, fast response speed, dozens of times faster than capacitive pressure change, zero self-balance, and temperature compensation