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The Labom differential pressure transmitter is an intelligent, two-wire pressure transmitter equipped with a microprocessor. Text operation control is carried out through a graphical display with a language module, and the menu-driven wizard allows users to set parameters simply and quickly. All settings can be made using the three buttons on the transmitter. It is possible to select the range and perform calibration without moving the device. It is possible to choose between outputting pressure graphs or percentage values, as well as displaying the measured values. You can also choose to display the output current. Menu selection allows the user to enter or set different parameters and operation modes. Differential pressure transmitters are selected based on the following factors: 1. Measurement range, required accuracy, and measurement functions; 2. The environment in which the measuring instrument will operate, such as industrial environments in the petrochemical industry, where there are flammable (toxic) and explosive hazards as well as high ambient temperatures; 3. The physical and chemical properties and state of the medium being measured, such as strong acids, strong bases, viscous substances, materials that tend to solidify or crystallize, or gases; 4. Changes in operating conditions, such as variations in temperature, pressure, and concentration of the medium. Sometimes, it is also necessary to take into account the changes in the concentrations and densities of the gas and liquid phases from the moment driving starts until the parameters reach normal production levels. 5. The structure, shape, and size of the container being measured, as well as the equipment and accessories inside the container and all the inlet and outlet pipes, must be considered – such as towers, solution tanks, reactors, boiler drums, vertical tanks, spherical tanks, etc. 6. Other requirements, such as those related to environmental protection and hygiene. 7. A unified approach should be adopted when selecting engineering instruments, with an effort to minimize the variety of models and specifications as well as the number of spare parts, to facilitate management. 8. The specific requirements of the process patent holders. 9. Actual process conditions: 1) Consider what category of equipment the device under test belongs to. For vessels such as tanks, the volume of tanks is small, so the measurement range is not very large, while tanks with larger volumes may have a wider measurement range. 2) It is necessary to consider the physical and chemical properties of the medium as well as its level of cleanliness; in such cases, conventional differential pressure transmitters and float-type level transmitters are the preferred choices, and it is also important to select the appropriate material for the parts that come into contact with the medium. 3) For media containing suspended particles or foam, single-flange differential pressure transmitters can be used. For some substances that tend to precipitate or crystallize easily, plug-in double-flange differential pressure transmitters are used; 4) For the level of highly viscous fluids as well as the level in high-pressure equipment, where it is not possible to make openings in the equipment, radiometric level gauges can be used for measurement; 5) In addition to issues related to measurement methods and technology, there are also considerations regarding the investment required for such instruments. In summary, the selection of a transmitter should be technically feasible, economically reasonable, and convenient for management. www.es600.cn