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| Selection method of differential pressure transmit |
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Differential pressure transmitters are selected according to the following points:
(1) Measurement range, required accuracy and measurement function;
(2) The environment faced by the measuring instrument, such as the industrial environment of petrochemical industry, the existence of combustible (toxic) and explosive dangerous atmosphere, and high ambient temperature;
(3) the physical and chemical properties and states of the measured medium, such as strong acid, strong alkali, viscous, easy solidification crystallization and gasification conditions;
(4) Changes in operating conditions, such as changes in medium temperature, pressure, and concentration. Sometimes it is also necessary to consider the change in the concentration and density of the gas phase and liquid phase from the start of the car to the normal production of the parameters;
(5) The structure, shape, size, equipment accessories in the container and various import and export material pipes should be considered, such as towers, solution tanks, reactors, boiler drum, vertical tanks, spherical tanks, etc.;
(6) other requirements, such as environmental protection and health requirements;
(7) The selection of engineering instruments should have a unified consideration, requiring as much as possible to reduce the variety specifications, reduce spare parts, to facilitate management;
(8) Specific requirements of the manufacturer.
(9) Actual process:
① Consider which type of equipment the tested object belongs to. Such as tanks, tanks, the volume of the tank is small, the measurement range is not too large, the volume of the tank is large, the measurement range may be larger;
② Depending on the physical and chemical properties and cleanliness of the medium, the conventional differential pressure transmitter and float type liquid level transmitter should also choose the material of the contact medium part;
③ For some suspended matter, foam and other media can be used single-flange differential pressure transmitter. Some are easy to precipitate, easy to crystallize with the insert double flange type differential pressure transmitter
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How to choose a pressure transmitter correctly
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