differential pressure transmitter working principle
Please visit the website: www.yantaiauto.com Click to view product www.yantaiauto.net.cn View Product Price capacitive pressure, differential pressure transmitter of the principle of capacitance transmitter has a variable capacitance sensing components. The sensor is a fully enclosed assembly process pressure, differential pressure filled through the diaphragm and silicone oil filling spread sensing diaphragm caused by displacement. Sensing diaphragm and the capacitance between the two capacitor plates by the electronic components into a poor (4-20) mA two-wire output signal. Distinguished friends: Hello! Welcome to Auto Meter Co., Ltd. Yantai Development Zone. I hope we have the opportunity to cooperate in the automated meter! You can give me quote you the price advantages of products. Our Email firstname.lastname@example.org Our company is the only producer in Shandong Province manufacturer of capacitive sensors, capacitance sensor can be used as 3051,1151 Series differential pressure transmitter, pressure transmitter, remote pressure transmitter, level transmitter flange manufacturing, the company and another SP, 2088, SH-A, EH Series transmitter , liquid level transmitter, Chang Hui Series digital instrumentation. Because it is the manufacturer so we have quality and price advantage. Welcome letter from the contact, we will be happy to help you! Contact: Miss Shi Tel :0535 -2162840 Fax :0535 -6382405 Website: www.yantaiauto.comwww.yantaiauto.net.cn pass the integrity of our account is yantaiauto If you need information, please contact our free mailing Web site: www. yantaiauto.com www.yantaiauto.net.cn
Principle of differential pressure transmitter
Differential pressure transmitter in the industrial practice is the most commonly used weight transmitters, which are widely used in various industrial automation environment, involving water utilities, rail transportation, intelligent buildings, production automation, aerospace, military, petrochemical, , oil, electricity, shipbuilding, machine tools, pipes and many other industries, the following brief introduction to some common principle of differential pressure transmitter and its application.
Principles of strain gauge and the application of differential pressure transmitter
A wide range of mechanical transmitter, differential pressure transmitter such as strain gauges, semiconductor strain gauge pressure transmitter, piezoresistive differential pressure transmitter, differential pressure transmitter inductive, capacitive differential pressure transmitter device, resonant capacitive differential pressure transmitter and acceleration sensors. However, the most widely used are piezoresistive differential pressure transmitter, it has a very low price and high precision and good linearity. Here we introduce this type of sensor.
Piezoresistive force sensor in understanding, we first learn what this component of resistance strain gauge. Resistance strain gauge is a strain on the change of the device under test converted into an electrical signal of the sensitive devices. It is the piezoresistive strain one of the main components of the transmitter. Resistance strain gauge is the most widely used metal and semiconductor strain gauges strain gauges of two. Metal strain gauges have filamentous-like metal foil strain gauges and strain gauges of two. Strain gage is usually a special binder by a close bond produces mechanical strain in the matrix, the matrix stress occurs when the stress, the resistance strain gauges are also produced with the deformation, so that the resistance strain gauge changes, so that increase the voltage on the resistance to change. The strain gauges in the force generated when the resistance changes are usually small, the general composition of this strain are strain gauge bridge, and through follow-up of the instrumentation amplifier to amplify, and then transmitted to the processing circuit (usually the A / D conversion and CPU) display or executing agencies.
Metallic resistance strain gauges of the internal structure
Shown in Figure 1 is a schematic structure of resistance strain gauge, which consists of base material, metal foil strain or strain wire, insulation sheet and terminations, and other components. According to different purposes, the resistance strain gauges can be designed by the designer, but the range of resistance should be noted: the resistance is too small, the required drive current is too large, while the gage's own temperature is too high fever caused different environments, resistance to change too much strain gage output was zero drift, the zero circuit is too complicated. The resistance is too large, too high resistance, anti less capable of electromagnetic interference from outside. Europe generally are dozens to a few thousand around Europe.
The working principle of strain gauges
Metallic resistance strain gauge works by adsorption in the matrix material with the mechanical deformation strain gauge resistance changes resulting from the phenomenon known as strain effects. Metal conductor resistance can be expressed as:
R = Ï * L / S
Where: Ï - resistivity of the metal conductor (Î© Â· cm2 / m)
S - conductor cross-sectional area (cm2)
L - the length of conductor (m)
We wire strain gauge, for example, when the metal wire by the external force, its length and cross-sectional area will change, from the above formula can easily be seen, the resistance value changes that would occur if the wire by the external force The extension, its length increased, while the cross-sectional area decreased, the resistance will increase. When the metal wire by the external force and the compression, reducing the length of the cross section increases, the resistance will be reduced. As long as the increase in measured change in resistance (typically measured voltage across the resistor), you can get the strain situation of wire strain
Principle and Application of Ceramic Pressure Transmitter
Corrosion-resistant ceramic pressure transmitter does not pass the liquid, the pressure directly on the front surface of the ceramic diaphragm, the diaphragm will produce small deformation, thick film resistors printed on the back of the ceramic diaphragm, connected into a Wheatstone Bridge (closed bridge), due to the piezoresistive effect varistor so that the bridge is proportional to the pressure to produce a highly linear, with the excitation voltage is also proportional to the voltage signal, the standard signal according to the different calibration of the pressure range of 2.0 / 3.0 / 3.3 mV / V, etc., and the strain sensor can be compatible. By laser calibration, the sensor has high temperature stability and time stability of the transmitter comes with temperature compensation 0 ~ 70 â„ƒ, and can and most direct contact with the media.
Ceramic is a recognized high elasticity, corrosion resistance, abrasion resistance, shock and vibration material. The thermal stability characteristics of ceramic thick film resistors and its operating temperature range can make it up to -40 ~ 135 â„ƒ, and has measured high precision and high stability. Electrical insulation level> 2kV, the output signal strength, long-term stability. High properties, low price of the ceramic transmitter differential pressure transmitter will be the development direction of a comprehensive alternative to the United States and Europe the trend of other types of sensors in China, more and more users use ceramic instead diffused silicon pressure sensor transmitter.
Diffusion Theory and Application of Silicon Pressure Transmitter
Directly measured the role of media pressure on the diaphragm in the transmitter (stainless steel or ceramic), medium pressure diaphragm is proportional to the generation and micro-displacement, the sensor's resistance to change, and the use of electronic circuit testing this change, and convert the output of a standard corresponding to the pressure measurement signal.
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Principle of pressure differential pressure transmitter
Clicks: 427 Published :2010 -8-30 9:02:27 process pressure on both sides or one side by the isolation diaphragm, filled to the irrigation
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