9 key points to pay attention to when selecting pressure and liquid level transmitters

With the development of science and technology and the introduction of energy-saving and emission reduction policies, the measurement of direct current energy has shown widespread application in industrial production and scientific research experiments, and the measurement of direct current energy is of great significance. Wide range of traffic and applications.

9 Precautions for Instrument Technology Selection

1. Measurement range, necessary accuracy, and measurement function: The minimum pressure measurement value is greater than 1/3 of the pressure gauge measurement, and telemetry and measurement accuracy are required.

If the requirements are high, pressure sensors or pressure differential pressure sensors should be selected; In cases where measurement accuracy is not required, resistive or electromechanical or Hall effect centrifugal pressure gauges can be selected; The movement of air is a pressure gauge.

The basic pressure indication regulator is suitable for local pressure indication regulation.

2. It is necessary to consider the structure, shape, size, accessories in the container, and various input/output material nozzles of the container to be tested, such as towers, solution tanks, reactors, boiler drums, tanks, spherical tanks, etc.

3. There must be a unified approach to process selection: minimize the standards for variety, reduce the number of fixtures, and manage profits.

4. The environment faced by pressure gauges: For example, in the industrial environment of the petrochemical industry, there is a flammable (toxic) explosion hazardous atmosphere, and the ambient temperature is relatively high. Therefore, pressure sensors and switches should be properly installed.

5. Reasonably select according to the detonation requirements of the installation location.

6. Actual process situation: Which equipment should be considered. For storage tanks and tanks, the tank volume is small and the measurement range is not large. However, if the tank volume is large, the measurement range may be large.

7. Based on the properties and cleanliness of the medium, positive pressure differential sensors and float type liquid sensors are selected to select the materials that come into contact with the medium. A single flange differential pressure sensor can serve as a medium for floating objects and bubbles. There are some plug-in double flange differential pressure sensors that are prone to precipitation and crystallization.

8. The liquid level of high viscosity media and the liquid level of high-pressure devices should not be perforated.

9. Other requirements, such as environmental and hygiene requirements, and specific requirements for process patents. Of course, in addition to measurement methods and technical issues, there are also issues with instrument investment. The physical and chemical properties and state of the tested medium: strong acid, strong alkali, high viscosity, and easy to solidify. Changes in operating conditions: changes in medium temperature, pressure, and concentration. From operation to normal production, the concentration and density of the gas and liquid phases can be considered.