Pressure transmitter is the most commonly used sensor in industrial practice, which is widely used in various industrial automatic control environments, touching water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military industry, petrochemical, oil wells, electric power, ships, machine tools, pipelines and many other occupations. With the continuous widening of application fields, the variety of pressure transmitters is also increasing, so how to choose the right pressure transmitter?
1. According to the type of pressure to be measured
The main types of pressure are gauge pressure, absolute pressure, differential pressure, etc. Gauge pressure refers to the pressure that is less or greater than the atmospheric pressure based on the atmosphere; Absolute pressure refers to the absolute pressure zero as the benchmark, higher than the absolute pressure; Differential pressure refers to the difference between two pressures.
2. According to the pressure range to be measured
In general, the measurement pressure is selected as 80% of the measurement scale according to the practice.
3. According to the medium to be measured
According to the different measurement medium, it can be divided into dry gas, gaseous liquid, strong corrosive liquid, viscous liquid, high temperature gas liquid, etc., according to the correct selection of different media, which is conducive to prolonging the service life of the transmitter.
4. Maximum overload according to the system
The maximum overload of the system should be less than the overload maintenance limit of the transmitter, otherwise it will affect the service life of the transmitter or even damage the transmitter. Typically, the safe overload pressure of a pressure transmitter is 2 times the full scale.
5. According to the required accuracy level
Measurement errors in transmitters are classified according to accuracy levels, with different accuracy corresponding to different fundamental error limits (expressed as a percentage of full-scale output). In practical application, the selection is carried out according to the control requirements of measurement errors and in line with the principle of economic application.
6. According to the scale of the operating temperature of the system
The temperature of the measuring medium should be within the working temperature scale of the transmitter, such as over-temperature application, which will produce a large measurement error and affect the service life of the transmitter; During the production of pressure transmitters, the influence of temperature is measured and compensated to ensure that the measurement errors caused by temperature are within the scale required by the accuracy class. In the case of high temperature, it is possible to consider selecting a high-temperature pressure transmitter or installing a condenser pipe, radiator and other auxiliary cooling methods.
7. According to the compatibility of the measurement medium and the touch material
In some measurement occasions, the measurement medium is corrosive, so it is necessary to select materials compatible with the measurement medium or carry out special process treatment to ensure that the transmitter is not damaged.
8. According to the power supply and output signal
Usually, the pressure transmitter is powered by DC power supply, and provides a variety of output signal selection, including 4-20mA.DC;, 0-5V. DC、1——5V. DC, 0-10mA.DC, etc., can have 232 or 485 digital outputs.
9. According to the on-site working environment and others
Whether there is vibration and electromagnetic interference, etc., relevant information should be provided when selecting the model, so that the appropriate treatment can be adopted. When selecting the model, other methods such as electrical connection methods can also be considered on a case-by-case basis.
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