Characteristics of universal limit switches for liquids

Limit switches for liquids are used throughout process engineering as standard. For economic reasons, it is recommended that all technical solutions should be reduced to one universal measurement principle. In this article, the requirements of such a universal limit switch are discussed and summarised using a vibronic limit switch as an example.

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Level detection for liquids employing the vibration measurement principle

The determination of levels in liquids forms part of standard measurement technology in all industries ranging from the chemical industry to the sanitary areas of the pharmaceuticals and food industry. The ideal level detection instrument can be employed in all applications and offers - despite its versatility - maximum dependability and safety in any specific application. In the course of recent years, the vibration principle of Liquiphant sensors has come out on top in all industries world-wide because of its simplicity, the high degree of dependability, the universal application range and the absence of maintenance work.

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Pulse radar for mm-precision in tank

The requirements of mm-precision in tank gauging under reference and application conditions are discussed. Decisive parameters of an overall concept (puls radar, carrier frequency 5,8GHz, phase evaluation, 2-wire systems, antenna choice) are explained and their advantages are illustrated.

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Selection criteria for level radar in the chemical industry

During the past three years the performance but also the variety of level radar devices has been increased significantly. For the use of radar systems the application has to be analysed according to the process and the tank specific requirements. Only then a cost effective solution can be defined. This article describes crite-ria for the proper selection of radar devices. Especially the choice of the frequency (e.g. 6 GHz or 26 GHz) and the antenna types are discussed.

(Only available in German)

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