The chemical integrated pipe corridor, as the name suggests, is the underground chemical pipeline integrated corridor. That is to build a tunnel space underground in the chemical industry park, integrating water, electricity, communication, radio and television, gas, drainage and other engineering pipelines. It has a special inspection port, lifting port and monitoring system to implement unified planning and design. Construction and management are important infrastructure and lifelines for the operation of chemical industry parks.
The advantages of the underground integrated pipe gallery are that the water supply, drainage, gas, electricity, telecommunications and other pipelines can be centrally arranged. The chemical industry park construction and municipal facilities management can make full use of the ground land resources, save underground space, reduce road excavation, and facilitate Pipeline maintenance and daily management.
The cabins in which water, electricity and gas are installed in the pipe gallery are independent and separated from each other. Aerosol fire extinguishing devices are installed every 2 meters, and fire-fighting facilities with automatic fire-fighting functions are installed in the pipe gallery. Once a fire occurs in the pipe gallery, the power supply can be automatically cut off by the fire center and the detector, and the fire zai area signal is transmitted to the aerosol fire extinguishing system to start the aerosol auto-extinguishing. A large number of differential pressure transmitters will be used in the automation of the chemical industry park.
When selecting a differential pressure sensor for a chemical industry park, designers often focus on key design parameters such as pressure range, current output, media compatibility, and environmental conditions. If you want to choose the right sensor for different applications, except
1. What kind of pressure medium is measured? 
The media directly determines the type of transmitter, diaphragm or threaded. Viscous liquids and mud can block the pressure interface, and solvents or corrosive substances will not damage the materials in the transmitter that are in direct contact with these media. These factors will determine whether to choose a direct barrier and a material that is in direct contact with the media. It is therefore important to be able to say what medium needs to be measured.
2. Which output signal is needed? 
Transmitters typically have a 4-20 mA output and a 0-5V output. The choice of output depends on a number of factors, including the distance between the transmitter and the system controller or display, and the presence of "noise" or other electrical interference. Signal, whether the amplifier, the position of the amplifier, etc. are needed. The most economical and effective solution for transmitters with mA output for many OEM devices with short distances between transmitter and controller.
3, the site environment needs the transmitter to achieve high accuracy
Determine the accuracy, nonlinearity, hysteresis, non-repetition, temperature, zero offset scale, temperature effects. But mainly by nonlinearity, hysteresis, non-repetition, the higher the accuracy, the higher the price. Usually the accuracy is selected by 0.075%, 0.1%, 0.2%, 0.5%, usually the domestic precision can reach 0.1%, and the imported can reach 0.075%.
4, the measuring range of the transmitter is the maximum pressure value to determine the large value of the measured pressure in the system, which is the measuring range of the transmitter. In general, it is necessary to select a transmitter with a pressure range that is about 1.5 times larger than the large value of zui. This is mainly in many systems, especially in water pressure measurement and processing, with peak and continuous irregular up and down fluctuations, which can damage the pressure transmitter. Continued high pressure values ​​or slightly exceeding the transmitter's calibrated maximum will shorten the life of the transmitter, which will also reduce accuracy. A buffer can then be used to reduce the pressure glitch, but this will reduce the response speed of the transmitter. Therefore, the pressure range, accuracy and stability should be fully considered when selecting the transmitter. Usually a typical pressure transmitter can load 3 times the pressure. Excessive overpressure can cause damage to the transmitter. If the range selection is too large, the actual pressure value will cause the transmitter to display inaccurate or unresponsive. Therefore, it is necessary to purchase some parameters.
5, strong structure
The service life of a pressure sensor in an application is one of the key indicators for selecting a sensor. In general, all-welded construction sensors are designed to be rugged, durable and have a long life in many demanding applications. Also, consider the weld fastness of the joint on the outer casing. Be aware that at the application site, these devices are often exposed to non-ideal environments that affect sensor operation.
6, reliable sensing technology 
Although the stable and reliable circuit design can meet the different needs of different people, in general, it is still important to its reliability, stability and harsh environment. Currently, sputtered thin films and variable capacitance technologies are considered as advanced sensing technologies for industrial applications. The capacitor consists of two conductive plates separated by an insulating layer (also called a dielectric). Capacitors come in a variety of sizes, their layout, and the dielectric materials used. When the capacitor is turned on, the voltage of the power source causes electrons to accumulate on the surface of one plate and discharges electrons on the surface of the other plate, resulting in a potential difference between the two plates.
The capacitance of the capacitor can be fixed or adjusted and varied depending on the application. The size, shape and distance of the electrode plates all affect the capacitance of the component. Compared to a capacitor formed by a smaller metal plate that is farther away, the capacitance of the capacitor formed by the larger metal plate is larger.
7 Before installing the differential pressure transmitter, please read the instruction manual in detail. The differential pressure interface should not leak during installation to ensure the correct range and wiring. The differential pressure sensor and the outer casing of the transmitter are generally grounded. The signal cable must not be mixed with the power cable. The sensor,
The underground integrated pipe gallery not only solves the problem of urban traffic congestion, but also greatly facilitates the maintenance and overhaul of municipal facilities such as power supply and drainage. During the construction and operation of underground pipe corridors in many cities in China, modern sensor technology is used to monitor the pipes in real time. The state of the gallery, to identify potential security risks in a timely manner.
Xi'an Huaheng Instrument Industry Automation Instrumentation and System Research and Development, Production, Sales and Service of High-tech Enterprises, based on the technological advantages of the original Xiyi, the company has developed and improved the core technology of inductive sensors and circuit boards, with more than 30 years of experience. Instrumentation production and research and development experience. As well as the exploration and research and development of HART protocol instruments, it is the pioneer of domestic intelligent instrument and HART protocol technology. It is mainly engaged in single flange level gauge, double flange level gauge, magnetostrictive level gauge, hygienic pressure. Transmitter, high-precision pressure transmitter, hart475 hand-operator, static pressure level gauge, input level gauge, a main product of the company that expands the technology enterprise from epitaxial expansion into connotative expansion. There are SMART Smart series pressure transmitters, liquid level (boundary) instruments, flow meters, temperature sensors and multi-parameter transmitters. Product measurement qualification, complete explosion-proof qualification, the entire production system has passed ISO9000 quality certification system certification. The research and development of intelligent magnetostrictive liquid level transmitter, double isolation static pressure level, wind load transmitter and other products have won a number of inventions, and received many praises from the market.
This article is collected by Xi'an Huaheng Instrument, some materials come from the network
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