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What Factors Should Be Considered in the Selection of Liquid Level Measurement Instruments in the Pharmaceutical Industry?

Liquid level measurement and monitoring play an important role in the automatic production of pharmaceuticals and other industries. The accuracy of liquid level measurement directly affects product quality, and even directly affects whether the production process can proceed smoothly. High-quality liquid level measurement instruments can guarantee the quality of raw materials, semi-finished products and finished products of pharmaceutical companies.

Therefore, only the scientific selection of liquid level measurement instruments can ensure the reliability and stability of the test results, thereby ensuring the consistency of product quality. So, what factors need to be considered in the selective application of the liquid level measurement instruments in the pharmaceutical industry?

Generally speaking, the main factors that pharmaceutical companies should consider when choosing liquid level measurement instruments are:

1. Measuring object of liquid level measurement instruments

The physical and chemical properties of the liquid to be measured (such as acid-base properties, conductivity, whether foam occurs, the pressure and temperature range of the application environment).

2. Measurement and control requirements of liquid level measurement instruments

On-off or continuous measurement, contact or non-contact level measurement, measurement range and accuracy, safety reliability and ease of construction.

3. Cost-effectiveness of liquid level measurement instruments

Currently, there is no level measurement technology that can adapt to all media or environments. This is because the working conditions are very different, and different types of level measuring instruments are required according to the working conditions. The production process of pharmaceuticals needs to achieve the purpose of reducing costs and ensuring safety through real-time monitoring, automatic control, and schedule management. Therefore, companies should ensure the characteristics and advantages of each measurement method, scientific selection, and product quality according to the measurement requirements and use environment. At the same time, purchase appropriate cost-effective products to ensure the reliability and stability of the test. 

In many instruments, the magnetic flap level gauge and the ultrasonic liquid level gauge are the two more commonly used liquid level measurement instruments. The magnetic flap level gauge can achieve a high degree of sealing, anti-seepage, suitable for high temperature, high pressure, and corrosion resistance. The glass plate (tube) water level gauge compensates for the defects of poor definition and easy breakage. The whole process of measurement has no blind spots with high definition and wide range of liquid level measurement. However, the working pressure on site should not be too high.

The ultrasonic liquid level gauge uses the characteristics of wave propagation in the medium, which is easy to install, and has good flexibility. It is mainly suitable for water tanks and open nails. It is generally installed at a high place and can be used for non-contact liquid level measurement. But it is susceptible to energy loss due to ultrasonic propagation.

In particular, when the ultrasonic wave encounters the upper surface during propagation, part of it is reflected, and the other part is refracted on the adjacent medium. When propagating from gas to liquid or solid, or from solid, liquid to air, the density of the medium is too different, and almost all reflections will occur. In addition, when the ultrasonic liquid level gauge is used in steam, dust and other environments, the detection distance will be greatly shortened. Therefore, it is not recommended to use the ultrasonic liquid level gauge in an absorbing (such as foam) environment.

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